Kīlauea

Coordinates: 19°25′16″N 155°17′12″W / 19.421097472°N 155.286762433°W / 19.421097472; -155.286762433
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For the town of Kīlauea on Kauai, see Kīlauea, Hawaii.

Kīlauea
Kīlauea's Ahu’aila’au cone erupting on the morning of June 28, 2018
Highest point
Elevation1,247 m (4,091 ft)[1]
Prominence15.3 m (50 ft)[2]
Coordinates19°25′16″N 155°17′12″W / 19.421097472°N 155.286762433°W / 19.421097472; -155.286762433[1]
Geography
Kīlauea is located in Hawaii
Kīlauea
Kīlauea
LocationHawaiʻi, United States
Geology
Age of rock210,000 to 280,000 years old[3]
Mountain typeShield volcano, hotspot volcano
Volcanic arc/beltHawaiian–Emperor seamount chain
Last eruptionSeptember 10–16, 2023

Kīlauea (US: /ˌkɪləˈweɪə/ KIL-ə-WAY-ə, Hawaiian: [kiːlɐwˈwɛjə]) is an active shield volcano in the Hawaiian Islands. It is located along the southeastern shore of Hawaii Island. The volcano is between 210,000 and 280,000 years old and grew above sea level about 100,000 years ago. Since the islands were settled it has been the most active of the five volcanoes that together form the island.

Kīlauea is one of the most active volcanoes on Earth. The most recent eruption lasted one week in September 2023 when multiple vents erupted inside Halemaʻumaʻu crater.

Kīlauea is the second-youngest product of the

Hawaiian hotspot and the current eruptive center of the Hawaiian–Emperor seamount chain. Because it lacks topographic prominence and its activities historically coincided with those of Mauna Loa, Kīlauea was once thought to be a satellite of its much larger neighbor. Kīlauea has a large, fairly recently formed caldera at its summit and two active rift zones, one extending 125 km (78 mi) east and the other 35 km (22 mi) west. An active fault
of unknown depth moves vertically an average of 2 to 20 mm (0.1 to 0.8 in) per year.

Between 2008 and 2018, Halemaʻumaʻu hosted an active lava lake. Kīlauea

black sand beach
, in 1990.

Beginning in May 2018,

Hawaii Volcanoes National Park.[7] The eruption ended in September 2018.[6] Two years later, Kīlauea erupted between December 2020 and May 2021 again within Halemaʻumaʻu crater, boiling off a water lake that had been growing for more than a year, and replacing it with a lava lake 229 m (751 ft) deep.[8][9]

In connection with the 2018 lower Puna eruption the Hawaiian Volcano Observatory predicted that a catastrophic collapse was "extremely unlikely".[10]

Background

Kīlauea is a Hawaiian word that means "spewing" or "much spreading", referring to its frequent outpouring of lava. Its earliest lavas date back to its submarine preshield stage. Samples were recovered by remotely operated underwater vehicles; samples of other flows were recovered as core samples. Lavas younger than 1,000 years old cover 90 percent of the volcano's surface. The oldest exposed lavas date back 2,800 years.

paleomagnetic dating identified a major eruption of Kīlauea around 1410, the first to be mentioned in Native Hawaiians' oral history.[11] Western contact and written history began in 1778. The first documented eruption of Kīlauea came in 1823 with repeated eruptions thereafter. Most occurred at the volcano's summit or its eastern rift zone, and were prolonged and effusive. The geological record shows that pre-contact explosive activity was common; in 1790 one such eruption killed more than 400 people, making it the deadliest volcanic eruption in what became the United States.[12]

Kīlauea's eruption from January 3, 1983, to 2018 was by far its longest-duration period of activity in modern times, as well as one of the longest-duration eruptions documented on Earth; as of January 2011, the eruption had produced 3.5 km3 (1 cu mi) of lava and resurfaced 123.2 km2 (48 sq mi) of land. Centuries prior to this event, the even larger ʻAilāʻau eruption of 1410 lasted about 60 years, ending in 1470 with an estimated volume of 4–6 km3 (0.96–1.44 cu mi).[13]

Kīlauea's activity has a major impact on its mountainside ecology, where plant growth is often interrupted by fresh

Hawaiian mythology Halemaʻumaʻu served as the body and home of Pele, goddess of fire, lightning, wind, and volcanoes.[14]

English

Hawaii Volcanoes National Park was signed into law by President Woodrow Wilson. The park is a World Heritage Site
and a major tourist destination, attracting roughly 2.6 million visitors annually.

Geology

Setting

Mauna LoaMauna KeaHualalaiKohala (mountain)
Location of Kīlauea on Hawaiʻi island

Like all Hawaiian volcanoes, Kīlauea was formed as the

Era.[16][17] However, while the Hawaiian mantle plume is well understood and extensively studied, the nature of hotspots themselves remains uncertain.[18]

Kīlauea is one of five

second youngest volcano in the Hawaiian–Emperor seamount chain, a chain of shield volcanoes and seamounts extending from Hawaii to the Kuril–Kamchatka Trench in Russia.[23]

Kīlauea started as a submarine volcano, gradually growing larger and taller via underwater eruptions of alkali basalt lava before emerging from the sea with a series of explosive eruptions[24] about 50,000 to 100,000 years ago. Since then, the volcano's activity has produced a continual stream of effusive and explosive eruptions of roughly the same pattern as its activity since records began to be kept.[25]

Hawaii island's oldest volcano,

extinct.[20] Eruptions and explosive activity will make Kīlauea taller, build up its rift zones, and fill and refill Kaluapele.[25]

Structure

Simulated true-color Landsat mosaic
Kīlauea's summit caldera; volcanic gas can be seen rising out of Halemaʻumaʻu, within the caldera (January 2012)

Kīlauea has been

lava flows, intermixed with volcanic ash and tephra produced by lower-volume explosive eruptions.[25] Much of the volcano is covered in historical flows, while 90 percent of its surface is from the last 1,100 years.[28] Much of its bulk remains underwater;[24] its subaerial surface is a gently sloping, elongate, decentralized shield with a surface area of approximately 1,500 km2 (579 sq mi),[29] making up 13.7 percent of the island's total surface area.[19]

Kīlauea lacks

topographical prominence, appearing only as a bulge on the southeastern flank of Mauna Loa. Native Hawaiians and early geologists considered it an active satellite of its host. However, lava analysis shows that the two have separate magma chambers. Nonetheless, high activity at one volcano roughly coincides with low activity at the other. When Kīlauea lay dormant between 1934 and 1952, Mauna Loa became active, and when the latter remained quiet from 1952 to 1974, the reverse was true. This is not always the case; the 1984 eruption of Mauna Loa started during an eruption at Kīlauea, but had no discernible effect on the Kīlauea eruption, and the ongoing inflation of Mauna Loa's summit, indicative of a future eruption, began the same day as new lava flows at Kīlauea's Puʻu ʻŌʻō crater. In 2002, Kilauea experienced a high-volume effusive episode at the same time that Mauna Loa began inflating. This unexpected communication is evidence of crustal-level interactions between them.[30] Geologists suggested that "pulses" of magma entering Mauna Loa's deeper magma system may have increased pressure inside Kīlauea and triggered the concurrent eruptions.[31]
Mauna Loa began erupting on November 27, 2022, during Kīlauea's ongoing eruption, the first time since 1984 that both volcanoes were simultaneously erupting.

Kaluapele

Kīlauea has a large summit caldera named Kaluapele (the pit of Pele),[21] measuring 4 by 3.2 km (2.5 by 2.0 mi) with walls up to 120 m (400 ft) high, breached by lava flows on the southwestern side.[27] The age of Kaluapele is unknown, and it is possible that it has appeared and disappeared multiple times.[25] Kaluapele likely formed over several centuries, beginning about 500 years ago,[32] while its present form was finalized around 1470–1510 after a particularly powerful eruption from 1410 to 1470.[25] A major feature within Kaluapele is Halemaʻumaʻu, a large pit crater and one of Kīlauea's most historically active eruption centers. The crater is approximately 920 m (3,018 ft) in diameter and 85 m (279 ft) deep, but its form has varied widely; its floor is mostly covered by flows from its 1974 eruption.[33]

Rift zones

Kīlauea has two rift zones radiating from its summit, one leading 125 km (78 mi) out to the east, the other 35 km (22 mi) long and trending towards the southwest.[25] A series of fault scarps connecting the rift zones form the Koaʻe Fault Zone. Tectonic extension along them is causing Kīlauea's bulk to slowly slide seaward off its southern flank at a rate of about 6 to 10 cm (2 to 4 in) per year, centered on a basal décollement fault 7 to 9 km (4 to 6 mi) beneath the volcano's surface.[34] The eastern rift zone is a dominant feature on the volcano; it is almost entirely covered in lava from the last 400 years, and at its crest near the summit is 2 to 4 km (1 to 2 mi) wide.[29] Non-localized eruptions, typical of rift zone activity,[25] have produced a series of low-lying ridges down the majority of the east rift zone's length.[29] Its upper segment is the most active section.[28][32] It is the site of large pit craters.[26] It reaches down Kīlauea's submerged flank to a depth of more than 5,000 m (16,400 ft).[32] By contrast, the much smaller southwestern rift zone last had a rifting episode in 1974, and has not been active in the current eruptive cycle.[34] The southwestern rift zone's extremity is underwater, although its subaerial length is more limited. The southwestern rift zone lacks a well-defined ridge line and pit craters, evidence that it is less active than the eastern rift zone.[32]

Hilina fault system

A prominent structure on Kīlauea's southern flank is the Hilina fault system, an active fault slipping vertically an average of 2 to 20 mm (1⁄16 to 13⁄16 in) per year.[clarification needed] Its physiographic province is 500 m (1,640 ft) deep, but it is unknown whether it is a shallow listric fault or penetrates deeply.[15]

Eruptive history

See also: List of Kīlauea eruptions

All historical eruptions occurred at either Kaluapele, the eastern rift zone, or the southwestern rift zone.[19] Half of Kīlauea's historical eruptions have occurred at or near Kaluapele. Activity there was nearly continuous for much of the 19th century, capped by an explosive eruption in 1924, before petering out by 1934. Later activity mostly shifted to the eastern rift zone, the site of 24 historical eruptions, located mostly on its upper section. By contrast, the southwestern rift zone remained relatively quiet, hosting five events.[25]

Graph summarizing the eruptions of Kïlauea during the past 200 years. The Pu‘u ‘Ö‘ö- Kupaianaha eruption has continued into the 21st century. Information is sketchy for eruptions before 1823, when the first missionaries arrived on the Island of Hawai‘i. The total duration of eruptive activity in a given year, shown by the length of the vertical bar, may be for a single eruption or a combination of several separate eruptions.

Prehistoric eruptions

Rainbow and volcanic ash with sulfur dioxide emissions from Halemaʻumaʻu (April 2008)

Geologists dated and documented dozens of major eruptions over the volcano's history, bridging the gap between Kīlauea's oldest known rock and written records and historical observation.[35] Lava flows are generally recovered by scientists in one of three ways. The oldest flows, 275,000 to 225,000 years ago, were recovered from Kīlauea's submerged southern slope by remotely operated vehicles. These lavas exhibit forms characteristic of early, submerged preshield-stage eruptive episodes, from when the volcano was a rising seamount yet to breach the ocean surface,[36] and their surface exposure is unusual, as in most other volcanoes such lavas would have since been buried by later flows.[15]

The second method is by drilling

Paleomagnetic dating, limited to rocks dating from after Kīlauea's emergence from the sea, suggested ages of around 50,000 years. Exposed flows above sea level are younger. Some of the oldest reliably dated rock is 43,000 years old. It comes from charcoal sandwiched beneath an ash layer on a fault scarp known as Hilina Pali; however, samples dated from higher up the scarp indicate ash deposition at an average rate of 6 m (20 ft) per thousand years, indicating that the oldest exposed flows, from the base of the feature, could date back as far as 70,000 years.[36] This date is similar to that of the oldest dated extant lava flow, a southwestern rift zone flow with uncorrected radiocarbon dating of approximately 4650 BC.[35]

The oldest well-studied eruptive product from Kīlauea is the Uwēkahuna Ash Member, the product of explosive eruptions from 800 to 100 BC. Although it was mostly buried by younger flows, it remained exposed in some places, and was traced more than 20 km (12 mi) from Kaluapele, evidence of powerful eruptions. Evidence suggests the existence of an active eruptive center at this time, termed the

pāhoehoe flows from the summit. Following the end of activity around 1600 CE, eruptions moved to the eastern part of Kīlauea's summit, and concurrently activity increased at the northern end of the eastern rift zone.[32]

1410 to 1790

The longest-duration major eruption witnessed by Native Hawaiians took place from about 1410 to 1470. Lasting around 60 years, the ʻAilāʻau eruption's effusive flow covered most of Kīlauea, north of the East Rift Zone in what became the Puna District.[37] Most likely due to the duration of this flow, the summit collapsed around 1470–1510, creating Kaluapele. These discoveries and the collapse of the summit were supplemented by translations of Native Hawaiian chants on the mythology of Pele and Hiʻiaka; these events were interpreted from this story.[11][38]

After arriving in Hawaii, Pele made Kīlauea her home. She sent her sister Hiʻiaka to retrieve Lohiʻau, an attractive man she met on Kauaʻi, on the condition that Pele protect the forests of Puna if Hiʻiaka returned in 40 days. As the journey lasted longer than 40 days, Pele set fire to the forest. When Hiʻiaka finally returned with Lohiʻau and made the smoky discovery, she became angry and made love to Lohiʻau right in front of Pele. In retaliation, Pele then killed Lohiʻau before throwing him in a pit on the summit of Kīlauea. Hiʻiaka started digging ferociously to recover his body, letting rocks fly everywhere.

These events are interpreted to describe the ʻAilāʻau flow.[11][38] In addition to Hawaiian oral history, geologists studied and confirmed them with radiocarbon and paleomagnetic dating.[37]

Kīlauea then entered a 300-year period of explosive eruptions from around 1510 to 1790 as discovered by the radiocarbon dating of the Keanakākoʻi (the cave in which

adzes were made) Tephra.[13][39] This tephra was formed after lava erupted hundreds of meters into the sky and spread ash across the area.[40]

1790 to 1934

The earliest reliable written records date to about 1820,

Hawai‘i Volcanoes National Park - it is listed on the National Register of Historic Places.[41] Kīlauea was the site of 61 separate eruptions between 1823 and 2024, making it one of Earth's most active volcanoes.[19][27]

James Gay Sawkins
, 1855

The volume of lava expelled by Kīlauea varied widely across eruptions. After 1823 Kaluapele gradually filled, filling up under nearly continuous summit eruption, with 3 km3 (1 cu mi) of lava released by 1840. The period between 1840 and 1920 saw approximately half that in lava volume. In the thirty years between then and about 1950, the volcano was unusually quiet and exhibited little activity; Kīlauea's eruptive volume increased steadily thereafter, with activity comparable to that of the early 1800s.[25]

The length and origin of these eruptions varied. Events lasted anywhere between days and years, and occurred at a number of different sites. Activity around Kaluapele was nearly continuous for much of the 19th century, and after a reprieve between 1894 and 1907, continued until 1924.

Effusive eruptions are of relatively recent vintage there. Prior to the arrival of Europeans, Kīlauea was the site of regular explosive activity, evidenced by tribal chants. .[42]

Kīlauea erupted in 1823 and 1832, but the first major eruption after 1790 occurred in 1840, when its eastern rift zone became the site of a large, effusive

lava fountaining.[44]

Activity in 1921–1923 followed.[27] The next major eruption occurred in 1924. Halemaʻumaʻu first drained, then quickly began sinking, deepening to nearly 210 m (689 ft) beneath a thick cloud of volcanic ash. Explosive activity began on May 10, blowing out rock chunks weighing as much as 45 kg (99 lb) 60 m (197 ft), and smaller fragments weighing about 9 kg (20 lb) as far as 270 m (886 ft). After a brief reprieve, the eruption intensified through a major blast on May 18, when an enormous explosive event caused the eruption's only fatality. The eruption continued and formed numerous eruption columns above 9 km (6 mi) in height, declining and ending by May 28.[42][45] Volcanic activity was soon confined to the summit, and ended after 1934.[27] From 1823 to 1924, the volcano erupted 15 times, with an additional 11 subsidence events occurring at the summit.[46]

1952 to 1982

The Mauna Ulu eruption of 1969 generated a 300-metre (1,000 ft)-high lava fountain

After the Halemaʻumaʻu event, Kīlauea remained relatively quiet, and for a time, completely silent, with activity confined to the summit.

ʻaʻā flow overran evacuated communities and resorts; the resulting summit deflation eventually caused Halemaʻumaʻu to collapse even further.[48]

After 1960 eruptive events occurred frequently until August 2018. The period 1967–1968 saw a particularly large, 80-million-cubic-meter, 251-day event from Halemaʻumaʻu.

Pauahi and Hiʻiaka.[49]

1983–2018

Main articles: Puʻu ʻŌʻō and Halemaʻumaʻu
Puʻu ʻŌʻō at dusk, June 1983

Another eruption occurred from January 1983 to September 2018. It had the longest duration of any observed eruption at this volcano. As of December 2020, it was the twelfth-longest duration volcanic eruption on Earth since 1750.

vent produced lava fountains that quickly built up into the Puʻu ʻŌʻō cone
, sending lava flows downslope.

In 1986, activity shifted down the rift to a new vent, named Kūpaʻianahā, where it took on a more effusive character. Kūpaʻianahā built up a low, broad volcanic shield, and

Kaimū was engulfed.[52] In 1992, the eruption moved back to Puʻu ʻŌʻō, but continued in the same manner, covering nearly all of the 1983–86 lava flows and large areas of coastline.[53]

As of the end of 2016, the east rift zone eruption had produced 4.4 km3 (1 cu mi) of lava, covered 144 km2 (56 sq mi) of land, added 179 ha (442 acres) of land to the island, destroyed 215 structures, and buried 14.3 km (9 mi) of highway under lava as thick as 35 m (115 ft).[54]

In addition to the nearly continuous activity at Puʻu ʻOʻo and other vents on the east rift zone, a separate eruption began at Kilauea's summit in March 2008. On March 19, 2008, following several months of increased sulfur dioxide emissions and seismic tremor, a new vent opened at Halemaʻumaʻu. Following this event, a new crater formed in the explosion, informally named the "Overlook Crater," emitting a thick gas plume that obscured views into the vent. Explosive events occurred at the vent throughout 2008.[55]

On September 5, 2008, scientists observed a lava pond deep within the Overlook Crater for the first time. Beginning in February 2010, a lava pond was visible at the bottom of the crater almost continuously through the beginning of May 2018. Lava briefly overflowed the vent onto the floor of Halemaʻumaʻu in April and May 2015, October 2016, and April 2018.[55][56][57]

2018 eruptive episodes

Main article: 2018 lower Puna eruption
Lava from a fissure slowly advanced to the northeast on Hoʻokupu Street in Leilani Estates subdivision (May 5, 2018)

Beginning in March 2018, Hawaiian Volcano Observatory began to detect rapid inflation at Pu‘u ‘Ō‘ō,[58] leading scientists to warn that the increased pressure could form a new vent at Kilauea.[59]

Following weeks of increased pressure, the crater floor of the cone of Puʻu ʻŌʻō collapsed on April 30, 2018, as magma migrated underground into the lower Puna region of Kilauea's lower east rift zone.[60] Over the next few days, hundreds of small earthquakes were detected on Kīlauea's East rift zone, leading officials to issue evacuation warnings. On May 3, 2018, new fissures formed, and lava began erupting in lower Puna after a 5.0 earthquake earlier in the day, causing evacuations of the Leilani Estates and Lanipuna Gardens subdivisions.[61][62]

A seemingly related 6.9 magnitude earthquake occurred on May 4.[63] By May 9, 27 houses had been destroyed in Leilani Estates.[64][65]

Kilauea Volcano Fissure 8 captured on May 3rd, 2019

By May 21, two lava flows had reached the Pacific Ocean, creating thick clouds of laze (a toxic lava and haze cloud made up of hydrochloric acid and glass particles).[66]

By May 31, 87 lava had destroyed houses in Leilani Estates and nearby areas, accompanied by additional evacuation orders, including for the town of Kapoho.[67][68] By June 4, the lava had crossed through Kapoho and entered the ocean. The confirmed number of houses lost reached 159,[69] then two weeks later, 533,[70] and ultimately 657.[71]

Two views of Halemaʻumaʻu from roughly the same vantage point. At left is the view from 2008, with a distinct gas plume from the Overlook vent, the location of what would become a long-lived lava lake. At right is a view of Halemaʻumaʻu after the eruptive events of 2018, showing the collapsed crater.
Two views of Halemaʻumaʻu from roughly the same vantage point. At left is the view from 2008, with a distinct gas plume from the Overlook vent, the location of what would become a long-lived lava lake. At right is a view of Halemaʻumaʻu after the eruptive events of 2018, showing the collapsed crater.

The lava lake at Halemaʻumaʻu began to drop on May 2.[60] The Hawaiian Volcano Observatory warned that this increased the potential for phreatic (steam) explosions at the summit caused by interaction of magma with the underground water table, similar to the explosions that occurred at Halemaʻumaʻu in 1924. These concerns prompted the closure of Hawaiʻi Volcanoes National Park.[72] On May 17, at approximately 4:15 a.m., an explosive eruption occurred at Halemaʻumaʻu, creating a plume of ash 30,000 feet into the air.[73] This marked the beginning of a series of vigorous explosions that produced significant ash plumes from Halemaʻumaʻu.[74] These explosions, accompanied by large earthquakes and inward slumping and collapse within and around Halemaʻumaʻu, continued until early August.[75][76]

2019–20: Water lake appears at the summit

In late July 2019, a water lake appeared on the bottom of Halemaʻumaʻu for the first time in over 200 years,[77] as water from the rebounding water table began to enter the crater. The crater lake gradually grew in size.[78] On December 1, 2020, the lake was approximately 49 metres (161 ft) deep.[79] Meanwhile, the temperature of the lake's surface, as measured by a thermal camera, generally measured between 70–85 °C (158–185 °F).[80] Within a month, the water lake was replaced by a lava lake during the new eruption.

December 2020 – May 2021 summit eruption

View of the eruption from outside Kaluapele, on December 20, 2020

On December 20, 2020, at 9:30 pm local time, an eruption broke out within Halemaʻumaʻu. The Hawaiian Volcano Observatory reported that three vents were feeding lava into the bottom of Halemaʻumaʻu Crater, boiling off the water lake that had been growing since summer 2019 and replacing it with a lava lake.

spatter cone had formed around the western vent.[85]

The eruption continued for another few months, with decreasing activity. On May 26, 2021, it was no longer erupting. Lava supply appeared to have ceased between May 11 and May 13, and the lake had crusted over by May 20. The last surface activity in Halemaʻumaʻu was observed on May 23.[86][87] When activity ceased, the lava lake was 229 metres (751 ft) deep.[88]

On August 23, 2021, the Hawaiian Volcano Observatory raised Kīlauea's alert status from "Yellow/Advisory" to "Orange/Watch" due to an earthquake swarm and a concurrent increase in ground deformation at the summit.[89] The observatory returned Kīlauea's alert status to "Yellow/Advisory" two days later.[90]

September 2021 summit eruption

Eruptive activity within Halemaʻumaʻu crater in January 2023

The Hawaiian Volcano Observatory recorded increased earthquake activity and changes in ground deformation patterns at Kīlauea's summit at about noon local time on September 29, 2021.[91] An eruption began at 3:20 p.m. local time when several fissures opened within Halemaʻumaʻu crater.[92] During the initial stages of the eruption, lava erupted in fountains more than 200 feet (61 m) tall. The fountain heights declined as the level of lava in the crater rose, partially drowning the erupting vents.[93]

Lava continued to erupt at Halemaʻumaʻu throughout the fall. Overflight measurements from October 5, 2022, indicated that 111 million m3 (29 billion U.S. gal) of lava had been effused, and that the floor of Halemaʻumaʻu had risen 143 meters (469 ft), since the beginning of this eruption.[94][95] The eruption paused on December 9, and the alert level was reduced accordingly on December 13, 2022, though seismic activity was still unsettled.[96]

2023 summit eruptions

Eruptive activity within Halemaʻumaʻu resumed on January 5, 2023.[97] The eruption ended 61 days later on March 7, 2023.[98]

On June 7, 2023, the Hawaiian Volcano Observatory detected a glow in web camera images atop Kilauea, indicating that an eruption had begun in the Halemaʻumaʻu crater, within Hawaii Volcanoes National Park.[99] The eruptive episode ended after twelve days on June 19, 2023.[100]

2023's third Halemaʻumaʻu eruption episode occurred from September 10 to September 16, 2023, when multiple vents opened.[101]

Hazards

In 2018, the USGS National Volcanic Threat Assessment gave Kīlauea an overall threat score of 263, and ranked it first among volcanoes in the United States most likely to threaten lives and infrastructure.[102]

Volcanic Explosivity Index

The

Volcanic Explosivity Index (VEI; the higher the number, the more explosive) to 90 of Kīlauea's 96 known eruptions of the last 11,700 years. The eruption of 1790 received a VEI of 4.[103] The 1983–2018 eruption was marked 3.[104] The eruptions of 1820, 1924, 1959 and 1960 received 2s. The eruptions of 680, 1050, 1490, 1500, 1610, 1868 and four eruptions in 1961 scored a 1. The other seventy-four stayed at 0.[103]

Volcanic Explosivity Index for Kīlauea
VEI Number of Holocene eruptions for which a VEI has been assigned (total=91)
VEI 0
75
VEI 1
10
VEI 2
4
VEI 3
1
VEI 4
1

Oral traditions

Native Hawaiians have passed down ancient oral traditions surrounding the volcanoes ever since they settled on the islands. These oral histories provide rich cultural and geologic knowledge. In the field of volcanology, the use of oral history emerged from obscurity to become a resource for understanding the eruption history of a given region. While oral history has been used to confirm previously known geologic data, it can be used to assess hazards surrounding an eruption, in addition to guiding the rehabilitation of affected communities.[105]

Using the oral history of the ʻAilāʻau eruption, volcanologists learned that Kīlauea was much more explosive than previously thought. Given its eruption history, the tradition predicts a long period of explosive eruptions.[40] Hawaiian chants provided clues that surface water had been found at the summit in earlier times. The story of Pele and Hiʻiaka recorded extensive lava flows, as well as a collapse of Kaluapele in about 1500.[21]

Ecology

Background

ʻŌhiʻa (Metrosideros polymorpha) growing on a barren lava field dating from 1986, formerly the village of Kalapana, Hawaii. The myrtle in this picture, taken in 2009, may have since been covered over—fresh flows in 2010 partially re-covered the area.

Because of its position more than 3,000 km (1,864 mi) from the nearest continental landmass, the island of Hawaiʻi is one of the most geographically isolated landmasses; this strongly influenced its ecology. The majority of the species present on the island are endemic, the result of its isolated lineage sheltered; its ecosystem is vulnerable to invasive species and to human development–an estimated one-third of the island's natural flora and fauna is extinct.[106]

Kīlauea's ecological community is further threatened by the volcano itself;[26] lava flows often overrun and incinerate forest sections, while ash smothers local plant life. Layers of carbonized organic material at the bottom of ash deposits are evidence of this destruction. Parts of the volcano's slopes display the dichotomy between pristine montane forest and volcanic "deserts" yet to be recolonized.[107]

Kīlauea's bulk affects local climate through the influence of

trade winds coming predominantly from the northeast, which, when squeezed upwards by the volcano's height, result in a moister windward side and an arid leeward flank. The volcano's ecology reflects its height, and by the distribution of volcanic products, making for varied soil conditions. The northern part of Kīlauea is mostly below 1,000 m (3,281 ft) and receives more than 75 in (191 cm) mean annual rainfall, and is mostly a lowland wet community; farther south, with precipitation less than 50 in (127 cm) mean annual rainfall, is considered mostly a lowland dry environment.[108]

Ecosystems

The ʻamakihi (Chlorodrepanis virens) is one of the many birds that live on the volcano's flanks.

Much of Kīlauea's southern section lies within the national park. It offers aʻe ferns, ʻōhiʻa trees (

critically endangered hawksbill sea turtle (Eretmochelys imbricata) nesting sites.[111]

Some of the area alongside the southwestern rift zone takes the form of the Kaʻū Desert. Although not a "true" desert (rainfall there exceeds the maximum 1,000 mm (39 in) a year), precipitation mixing with drifting volcanic sulfur dioxide forms acid rain with a pH as low as 3.4, greatly hampering plant growth.[112] The deposited tephra particulates make the local soil very permeable. Plant life there is practically nonexistent.[113]

Kīlauea's northern lowland wet-forest ecosystem is partially protected by the

Hemignathus virens), and nananana makakiʻi (Theridion grallator) live in the trees. Many more as-yet-undocumented species are thought to lie within the forest.[114][115] Wao Kele's primary forest tree is ʻōhiʻa lehua (Metrosideros polymorpha).[116]

Human history

Ancient Hawaiian

The first

Polynesian rat (Rattus exulans).[120]

The summits of the island's volcanoes are revered as

leeward) side. The rusty singed appearance of the young fronds of the ʻamaʻumaʻu are said to be a product of the legendary struggle.[122][118]

Modern era

Students collecting GPS data for the USGS in Kīlauea's eastern rift zone in 2015

The first foreigner to arrive at Hawaii was

missionary who in 1823 spent more than two weeks trekking across the volcano. He collated the first written account of the volcano and observed many of its features.[124]

Wikisource has original text related to this article:

Another missionary, C. S. Stewart, U.S.N., wrote of it in his journal A Residence in the Sandwich Island, which Letitia Elizabeth Landon quoted from in the notes to her poetical illustration to an engraving of a painting by William Ellis after F Howard, The Volcano of Ki-Rau-E-A in Fisher's Drawing Room Scrap Book, 1832.[125]

One of the earliest and most important surveyors of Kīlauea was

C. E. Dutton elaborated on Dana's research during an 1884 expedition. His work led Kīlauea to be accepted as a separate entity.[128]
: 154–155 

Hawaiian Volcano Observatory

Steam venting from fissures inside Kaluapele, October 2022

The next era of Kīlauea's history began with the establishment of the Hawaiian Volcano Observatory in 1912. The first permanent such installation in the United States, the observatory was the brainchild of Thomas Jaggar, head of geology at the Massachusetts Institute of Technology. After witnessing the devastation of the 1908 Messina earthquake near Mount Etna in Italy, he declared that systematic volcanic and seismic study was requirede, and chose Kīlauea as the initial site. After securing funding from MIT and the University of Hawaiʻi, Jaggar served as director of the observatory between 1912 and 1940. He pioneered seismological and observational study and observation of the volcano.[129] After initial funding ran out, the Observatory was funded by the National Weather Service, USGS, and the National Park Service in turn. USGS reclaimed the observatory and funded it after 1946. The main building moved twice since establishment, and today sits on the northwest rim of Kaluapele.[130]

Apollo Astronauts in recognizing volcanic features, planning traverses, collecting samples and taking photographs. Training took place in April 1969, April 1970, December 1970, December 1971, and June 1972. Astronauts of Apollo 12, Apollo 14, Apollo 15, Apollo 16 and Apollo 17 used this training on the Moon. Notable geologist instructors included William R. Muehlberger.[131]

Research

In October 2019, January 2020, and December 2020, USGFS volcanologists used a drone to study gases inside the water lake at the summit, as it was too dangerous for humans to approach. After the lake boiled away, they used the drone to study the resulting gas plumes.[132]

In 2022, researchers reported that Kīlauea's seismic waves could be used to predict future outbreaks. These waves can last for tens of seconds. After the 2007 eruption ended, they analyzed thousands of events from seismic sensors, GPS stations, and lake height observations, including variables such as temperature and gas bubble density. They reported that magma temperature was associated with seismic signal duration and bubble quantity and composition.[133]

Tourism

See also: Hawaiʻi Volcanoes National Park
Kilauea Iki: across Kaluapele, Halemaʻumaʻu is emitting fume on the left side of Kaluapele, while Mauna Loa
towers above in the background (March 2013)

Kīlauea became a tourist attraction in the 1840s, and businessmen such as

Benjamin Pitman and George Lycurgus operated a series of hotels at the rim, including Volcano House, which is the only hotel or restaurant located within Hawaiʻi Volcanoes National Park.[134]

In 1891,

Haleakala National Park on September 22, 1960. Today, the park, renamed the Hawaiʻi Volcanoes National Park, is a major conservatory agency and tourist attraction, and, since 1987, a World Heritage Site.[136]

Hawaii tourism grew slowly before exploding with the advent of

Thomas A. Jaggar Museum was a popular tourist stop. Located at the edge of Kaluapele, the museum's observation deck offered the best sheltered view on the volcano of the activity at Halemaʻumaʻu; however, the museum closed indefinitely after the building housing sustaining structural damage from earthquakes associated with the 2018 eruptions.[139]

Glowing lava at sunset, seen from near Volcano House, October 2022

Volcano House provides lodging within the park, while additional housing options are available in the

Volcano Village. Visitors associated with the military can find lodging at the Kilauea Military Camp. The park provides hiking trails, points of interest, and guided ranger programs.[140][141]

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Further reading

External links

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