1456 Central Italy earthquakes

Coordinates: 41°18′07″N 14°42′40″E / 41.302°N 14.711°E / 41.302; 14.711
Source: Wikipedia, the free encyclopedia.
1456 Central Italy earthquakes
1456 Central Italy earthquakes is located in Italy
1456 Central Italy earthquakes
Magnitude7.19–7.4 Mw  (December 5)[1]
7.0 Mw  (December 30)
Depth12–25 km (7.5–15.5 mi)
Epicenter41°18′07″N 14°42′40″E / 41.302°N 14.711°E / 41.302; 14.711
Areas affectedKingdom of Naples
Max. intensityMMI XI (Extreme)
TsunamiYes
Casualties30,000–70,000 dead[2]

On December 5, 1456, the largest earthquake to occur on the

moment magnitude of Mw  7.19–7.4, and was centred near the town of Pontelandolfo in the present-day Province of Benevento, southern Italy. Earning a level of XI (Extreme) on the Modified Mercalli intensity scale
, the earthquake caused widespread destruction in central and southern Italy. An estimated 30,000–70,000 people were killed. It was followed by two strong Mw  7.0 and 6.0 earthquakes to the north on December 30.

Tectonic setting

The central Italian Peninsula is dominated by active

normal faults.[4] The faults associated with large earthquakes on the peninsula are geologically young in age, and rarely rupture the surface. Occasionally, strike-slip events like the 1456 sequence, as well as the 1971 (Mw  5.0) and 2012 (Mw  4.6) moderate earthquakes in the southern Apennine region suggest the dominant style of faulting is not limited to normal dip-slip.[5]

Earthquakes

December 5

The earthquake of December 5 was estimated at Mw  7.19 ± 0.1 by the 2014 version of the National Institute of Geophysics and Volcanology earthquake catalog.[1] The earthquake occurred in a region of active crustal movement along east–west striking strike-slip faults. Its magnitude has been estimated to be as high as Mw  7.4.[2]

Based on studying the macroseismic effects two hypotheses were postulated;[6] the occurrence of one large mainshock, or three distinct shocks closely-spaced in time.[2] The single-mainshock hypothesis could only be rationalized by a deep event occurring at ~30 km (19 mi) depth. This hypothetical depth would be greater than the average in the Apennines (10–15 km (6.2–9.3 mi)).[6] Northwest-southeast trending normal faults are thought to be the source of the quake. Unlike most earthquakes in the area with rupture occurring in the shallow 12 km (7.5 mi) of the crust, the source of the 1456 earthquake was at between 12 km (7.5 mi) and 25 km (16 mi) depth. The 1456 earthquake subsequently triggered future earthquakes nearby due to the behavior of faults in the area.[7]

The second hypothesis suggest three distinct mainshocks with depths of 15.5 km (9.6 mi), 14 km (8.7 mi), and 17.5 km (10.9 mi), respectively. These depths are consistent with the average focal depths of earthquakes in the Apennines.[6] The rupture process involved a complex cascade of independent faults rupturing subsequently;[7] as many as five subevents constituted the mainshock.[8] The earthquake rupture extended from Abruzzo to Irpinia.[9] Another hypothesis suggest the earthquakes were strike-slip events that occurred at a depth of 10–25 km (6.2–15.5 mi). The December 5 event occurred along a west-northwest-east-southeast striking oblique right-lateral fault. It ruptured east of the fault that caused the earthquake of 1688.[7]

Subsequent events

Many large aftershocks accompanied the earthquake of December 5. A similar fault located further north, in Matese generated the shock of December 30.[2] Intensity X–XI was felt in a northwest–southeast trending configuration from Macchiagodena to Castelluccio Acquaborrana. It was also felt in an east–west area from Boiano to Cercemaggiore. The widespread distribution of great intensity and its similarities with the December 5 event suggest the December 30 quake occurred at a deeper depth (>10 km (6.2 mi)). Based on evaluating the reported intensities of the December 30 event, its magnitude is estimated to be no greater than Mw  7.2.[7] A third shock was recorded in the area affected by the December 30 event. This earthquake was felt VIII–IX over a wide area as well, suggesting a deep focal origin. A Mw  of 6.0 was estimated.[7]

Effects

Caramanico Terme experienced a maximum Mercalli intensity of XI

The December 5 shock struck at 23:00 local time,[9] lasting approximately 150 seconds. Devastation was reported in five of the 20 regions of Italy; Abruzzo, Molise, Campania, Apulia, and Basilicata; whereas some damage occurred in Lazio and Calabria.[10] Complete destruction occurred in a zone measuring 6,000 km2 (2,300 sq mi). Whereas the total area affected was 18,000 km2 (6,900 sq mi).[11] The area of devastation was unusually large compared to most earthquakes in Italy; thought to be caused by the occurrence of multiple ruptures.[12]

The meizoseismal area stretched for nearly 180 km (110 mi), assigned X–XI (Extreme), where destruction of structures occurred. The unusually large area of the meizoseismal area is caused by multiple faults, separated by significant distances rupturing. The commune of Caramanico Terme experienced a maximum intensity of XI. Intensity IX–X was felt in the towns of Tocco da Casauria, Torre de' Passeri and Castiglione a Casauria. From the lower Aterno Valley (in the north), to Sulmona, and Navelli (in the southeast), the intensity was VIII–IX. Intensity VIII–IX was felt over an area that was 40 km (25 mi) wide. About 20 km (12 mi) away, the intensity gradually decreased to V.[7]

As many as 70,000 people perished in the earthquake. In the town of Isernia, catastrophic damage occurred; 1,500 residents of the total 2,035 perished.[7] Between 100 and 150 people died in Naples due to many homes and churches collapsing.[2] Another 100 people died in Pozzuoli.[13] There were between 600 and 2,200 fatalities in Apice; 2,000 in Barberio; more than 1,000 in Lafino; over 1,000 in Lafino; 1,200 in Isernia 400 in Cerreto Sannita; and 1,200 in Acerenza.[14] The city of Ariano was razed—between 600 and 2,200 residents perished. A metrical inscription by Bishop Orso Leone placed in the Ariano Cathedral numbered the dead at a thousand. The town was rebuilt by 1470.[15] The towns of Acquaviva, Apice, Biccari, Campobasso and Casalduni suffered massive destruction or were totally destroyed.[16]

The earthquake of December 30 struck at 21:30 which measured ~Mw  7.0 was not as severe in

Sannio and the Campana Plain might be due to conflicting reports of the previous event. Major damage occurred in Isernia. There was no damage in the areas between Castel di Sangro and Sulmona. Additional damage also occurred due to the aftershocks, which persisted up till early 1457. The aftershock sequence only ended in May 1457.[7]

Tsunami

A series of anomalous waves in the port of Naples also caused boats to crash.[17] There was also reports of a tsunami in the Gulf of Taranto, where it struck the Ionian coastline.[18]

Aftermath

Several villages in the affected area were abandoned.

King of Aragon, received news of the disaster while he was residing in Apulia. He would only return to Naples in early February 1457, where he declined tax exemption requests by survivors in the affected towns. Alfonso V stated that the survivors were able to pay taxes as they inherited the fortune of those who were killed. Reconstructions by the authorities were limited; only military fortresses, roads and bridges were supported in the interest of the military.[12]

See also

References

  1. ^
    doi:10.13127/CPTI/CPTI15.4. Retrieved 9 February 2022. {{cite journal}}: Cite journal requires |journal= (help
    )
  2. ^
    S2CID 210975336
    .
  3. doi:10.1016/j.tecto.2008.09.033
    .
  4. doi:10.1785/0120080053. Archived
    from the original on 10 April 2009. Retrieved 6 April 2009.
  5. doi:10.1016/j.tecto.2016.10.032
    .
  6. ^
    S2CID 140695042
    .
  7. ^
    doi:10.1785/0120050250
    .
  8. ^ Carlo Meletti; Etta Patacca; Paolo Scandone (1988). "Il terremoto del 1456 e la sua interpretazione nel quadro sismotettonico dell'Appennino meridionale". Il Terremoto del 1456, Napoli (in Italian). 1: 72–108.
  9. ^ a b Giuseppe Perrina (9 December 2020). "Ariano: il terremoto del 1456 e la ricostruzione cittadina". Irpinia World. Retrieved 9 February 2022.
  10. ^ Giovanni Vincenzo Ciarlanti (1823). Memorie istoriche del Sannio, chiamato oggi principato ultra, contado di Molisi, e parte di terra di Lavoro, provincie del regno di Napoli: Divise in cinque libri, ne'quali si descrivono i suoi confini, gli abitatori, le guerre, edificazioni, e rovine de'luoghi; i signori di essi, le loro famiglie, e gli uomini illustri, che vi fiorirono nella santità, nelle lettere, e nell'arme (in Italian).
  11. ^ Paolo Forlin (10 June 2020). "How medieval Europe recovered from earthquakes". The Conversation. Retrieved 9 February 2022.
  12. ^ a b Centro EEDIS (5 December 2017). "5 DICEMBRE 1456: IL DEVASTANTE TERREMOTO Mw 7.2 CHE FECE 30MILA MORTI TRA CAMPANIA, MOLISE E ABRUZZO". blueplanetheart.it (in Italian). Retrieved 9 February 2022.
  13. ^ "Significant Earthquake Information". ngdc.noaa.gov. NOAA National Centers for Environmental Information. Retrieved 9 February 2022.
  14. ^ "Tsunami Event Information". ngdc.noaa.gov. NOAA National Centers for Environmental Information. Retrieved 9 February 2022.
  15. Fratelli Bocca
    . p. 68.
  16. ISBN 978-0-7923-6548-8
    .
  17. ^ "Catalogue of strong earthquakes in Italy". National Institute of Geophysics and Volcanology. Archived from the original on 3 November 2016. Retrieved 9 February 2022.
  18. ^ "Miscellanea" (PDF) (in Italian). National Institute of Geophysics and Volcanology. 2013. p. 69. Archived from the original (PDF) on 14 February 2018.
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