2019 Davao del Sur earthquake
UTC time | 2019-12-15 06:11:51 |
---|---|
ISC event | 616987910 |
USGS-ANSS | ComCat |
Local date | December 15, 2019 |
Local time | 14:11 PST |
Magnitude | 6.8 Mww 6.9 Ms |
Depth | 18.0 km (11.2 mi) |
Epicenter | 6°41′49″N 125°10′26″E / 6.697°N 125.174°E |
Fault | Tangbulan Fault |
Type | Strike-slip |
Areas affected | Mindanao, Philippines |
Max. intensity | MMI VII (Very strong) PEIS VII (Destructive) |
Landslides | Yes |
Casualties | 13 dead, 1 missing, 210 injured[1] |
At 14:11
Tectonic setting
Mindanao lies across the complex
Earthquake
The earthquake was recorded as 6.8 Mw by
There were a series of large aftershocks, including nine of M ≥ 5.0 in the first 48 hours after the mainshock,[10] with the largest being an mb 5.7 event about an hour afterwards, which had a maximum felt intensity of VII (MMI).[11]
This event followed on from a series of earthquakes that struck Mindanao during October that year. The sequence of three M>6 events affected that area to the northwest of the December earthquake. The December 15 event is likely to be related to the earlier sequence,[2] possibly by the effects of stress transfer.[12][8][9]
Intensity | Location |
---|---|
VII | Digos; Bansalan, Hagonoy, Kiblawan, Magsaysay, Matanao, Padada, and Santa Cruz, Davao del Sur |
VI | General Santos; Kidapawan; Koronadal; Malalag and Sulop, Davao del Sur; Santa Maria, Davao Occidental; Malungon, Sarangani; Columbio, Sultan Kudarat |
V | Cotabato City; Davao City; Antipas, Arakan, Carmen, Magpet, Makilala, Matalam, M'lang, and Tulunan, Cotabato; Lupon, Davao Oriental; Alabel, Glan, and Malapatan, Sarangani; Polomolok, Tampakan, and Tupi, South Cotabato |
IV | , Sultan Kudarat |
III | Cagayan de Oro; Gingoog; Mati and Tarragona, Davao Oriental; Dangcagan and Maramag, Bukidnon |
II | Butuan; Dipolog; Impasugong and Libona, Bukidnon; Aleosan, Cotabato; Tubod, Lanao del Norte |
I | Molave, Zamboanga del Sur |
Instrumental intensities | |
VI | Davao City; Kidapawan; Alabel, Sarangani |
V | General Santos |
IV | Cagayan de Oro; Koronadal; Malungon, Sarangani |
III | Cotabato City; Gingoog; Tupi, South Cotabato |
II | Kiamba, Sarangani |
I | Zamboanga City; Bislig |
Analysis using InSAR data
The sequence of four earthquakes has examined using
The two studies give similar results, confirming that the first and last major earthquakes in the sequence were caused by rupture along NW-SE trending left-lateral strike-slip faults, while the second and third resulted from rupture along SW-NE trending right-lateral strike-slip faults nearly orthogonal to the other two. One of the studies matched the four interpreted ruptures to known faults. The first event is interpreted to have ruptured the M'lang Fault, the second the Makilala Fault, the third the Balabag Fault and the last the Makilala-Malungon Fault. The observed sequence of earthquakes rupturing orthogonal strike-slip fault sets has been compared to the 2019 Ridgecrest earthquake sequence.[9]
Damage and casualties
The greatest damage from the earthquake was in the area around the
A six-year-old child was crushed by a wall in the barangay of Asinan in Matanao. Three others were killed and several others were trapped in Padada when a supermarket collapsed. As of December 23, at least 13 people had been killed, one remained missing and a total of 210 people were reported injured in the quake.[1]
Aftermath
As of December 29, 40,424 people from 10,505 families were reported to be sheltering in a total of 102 evacuation centers after the earthquake, with a further 100,427 people (23,321 families) being assisted by friends and family.[13]
See also
- List of earthquakes in 2019
- List of earthquakes in the Philippines
- 2019 Cotabato earthquakes
- July 2019 Cotabato earthquake
References
- ^ a b c National Disaster Risk Reduction and Management Council (December 22, 2019). "NDRRMC Update: SitRep No. 12 regarding Magnitude 6.9 Earthquake in Matanao, Davao del Sur (Region XI)" (PDF). Retrieved December 22, 2019.
- ^ a b c ANSS. "Davao del Sur 2019: M 6.8 - 6km S of Magsaysay, Philippines". Comprehensive Catalog. U.S. Geological Survey. Retrieved December 15, 2019.
- ^ "Philippine Sea Plate". Tectonics of Asia. Retrieved 2019-12-15.
- ^ United States Geological Survey (2010). "Porphyry Copper Assessment of East and Southeast Asia— Philippines, Taiwan (Republic of China), Republic of Korea (South Korea), and Japan" (PDF). Global Mineral Resource Assessment. p. 3032.
- ^ Philippine Institute of Volcanology and Seismology (November 8, 2019). "Update on the October 2019 Cotabato Fault System Earthquake Series". Retrieved December 15, 2019.
- ^ a b Philippines Institute of Volcanology and Seismology (December 15, 2019). "Earthquake Information No. 4". Retrieved December 18, 2021.
- ^ a b United Nations Office for the Coordination of Humanitarian Affairs (December 16, 2019). "Philippines: 6.9-magnitude earthquake, Davao del Sur Flash Update No. 1" (PDF). Retrieved December 16, 2019.
- ^ .
- ^ .
- ^ ANSS (December 18, 2019). "Search results". Retrieved December 18, 2019.
- ^ ANSS. "Davao del Sur 2019a: M5.7 - 9km SSW of Sulop, Philippines". Comprehensive Catalog. U.S. Geological Survey. Retrieved December 16, 2019.
- ^ Sabillo, K. (December 16, 2019). "Explainer: How Davao del Sur's M6.9 quake may be linked to October temblors". ABS CBN News. Retrieved December 19, 2019.
- ^ a b c Disaster Response Operations Monitoring and Information Center (December 29, 2019). "DSWD DROMIC Report #11 on the Ms 6.9 Earthquake Incident in Matanao, Davao del Sur" (PDF). Retrieved December 31, 2019.
- ^ National Disaster Risk Reduction and Management Council (December 23, 2019). "NDRRMC Update: SitRep No. 13 regarding Magnitude 6.9 Earthquake in Matanao, Davao del Sur (Region XI)" (PDF). Retrieved December 23, 2019.[permanent dead link]
External links
- The International Seismological Centre has a bibliography and/or authoritative data for this event.
- ReliefWeb's main page for this event.