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2017 Ischia earthquake

Damage to buildings caused by the earthquake, photo taken on 26 August 2017
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UTC time	2017-08-21 18:57:51
ISC event	611834681
USGS-ANSS	ComCat
Local date	21 August 2017
Local time	20:57 CEST
Magnitude	3.9 Mw 4.2 mb
Depth	2.0 km (1.2 mi) (INGV) 2.7 km (1.7 mi)(USGS)
Epicenter	40°44′24″N 13°54′0″E / 40.74000°N 13.90000°E / 40.74000; 13.90000
Areas affected	Ischia, Campania
Max. intensity	EMS-98 VIII (Heavily damaging) MMI VIII (Severe)
Casualties	2 deaths 42 injured 2,600 homeless

The 2017 Ischia earthquake occurred in the island of Ischia, Campania, in southern Italy. The main shock occurred at 20:57 CEST (18:57 UTC) on 21 August 2017, and was rated 3.9 M_w  or 4.2 mb  on the moment magnitude scale.

Despite the moderate magnitude, several buildings and a church collapsed. One woman died in Casamicciola Terme after being hit by rubble that fell from a church. Another woman died when her house collapsed.

Damage and debates

The collapse of several buildings and the death of two women created much controversy and debate in Italy, because many geologists stated that with a moderate magnitude quake, modern buildings should not collapse.

Moreover, Ischia is a zone with a high number of irregular buildings, and many critics considered the poor construction materials as the main cause for the death of the two women and for the damage.

The sharp increase of the population between 1950s and 1980s and the growing inflow of tourists increased the anthropic pressure on the island. Significant acreage of land previously used for agriculture has been developed for the construction of houses or residential buildings. Most of this development took place without any planning and building permits. Many houses and structures across the island sustained moderate to severe damage when the earthquake hit.

See also

• List of earthquakes in 2017
• List of earthquakes in Italy
• 1883 Casamicciola earthquake

References

1. Bruno Briseghella; Cristoforo Demartino; Alessandra Fiore; Camillo Nuti; Concetta Sulpizio; Ivo Vanzi; Davide Lavorato; Gabriele Fiorentino (2019). "Preliminary data and field observations of the 21st August 2017 Ischia earthquake". Bulletin of Earthquake Engineering. 17 (3). Springer: 1221–1256. Bibcode:2019BuEE...17.1221B. doi:10.1007/s10518-018-0490-x. S2CID 116798474.
2. Marco, Mancini; Caciolli, Maria Chiara; Gaudiosi, Iolanda; Alleanza, Giorgio Andrea; Cavuoto, Giuseppe; Coltella, Monia; Cosentino, Giuseppe; Di Fiore, Vincenzo; A., d’Onofrio; Gargiulo, Francesco; Milana, Giuliano; Pietrosante, Andrea; Pompa, Pier Paolo; Silvestri, Francesco; Vassallo, Maurizio (2021). "Seismic microzonation in a complex volcano-tectonic setting: the case of northern and western Ischia Island (southern Italy)". Italian Journal of Geosciences. 140 (3): 328–408. doi:10.3301/IJG.2021.10. S2CID 239291142.
3. Terremoto a Ischia, due morti e 39 feriti. Corsa per salvare l’ultimo fratellino rimasto sepolto
4. "Forte terremoto a Ischia, crolli a Casamicciola. Due morti e almeno 39 feriti". Archived from the original on 29 August 2017. Retrieved 22 August 2017.
5. Ischia, 2.600 sfollati. La Protezione civile: "Niente tendopoli"
6. "Terremoto 1 km SW Casamicciola Terme (NA), Magnitudo Mw 3.9, 21 agosto 2017 ore 20:57:51 (Fuso Orario Italia) » INGV Centro Nazionale Terremoti".
7. "M 4.2 – 4 km NNE of Casamicciola Terme, Italy".
8. Terremoto a Ischia, crolli a Casamicciola. Morta una donna, ci sono feriti e dispersi. Evacuato ospedale
9. Terremoto a Ischia, due vittime. Crolla abitazione, famiglia imprigionata: in salvo padre e figlio di 7 mesi. Almeno 36 feriti
10. Terremoto a Ischia, i geologi: «Case abusive o fatiscenti, allucinante morire per scosse di questa entità» I sindaci: «Nessun legame fra crolli e abusivismo»
11. Terremoto Ischia, cemento e inchieste sull’isola dove non esiste l’abusivismo di necessità. È solo speculazione
12. Magnitudo bassa, abusivismo alto: basta una scossa per mettere in crisi un'isola
13. Ischia, il terremoto o gli edifici: cosa c’è davvero dietro i crolli? Il magistrato: «Troppe case abusive»

Further reading

• Braun, T.; Famiani, D.; Cesca, S. (2018), "Seismological Constraints on the Source Mechanism of the Damaging Seismic Event of 21 August 2017 on Ischia Island (Southern Italy)", Seismological Research Letters, 89 (5): 1741–1749, Bibcode:2018SeiRL..89.1741B, doi:10.1785/0220170274, S2CID 59415740
• d'Auria, L.; Giudicepietro, F.; Tramelli, A.; Ricciolino, P.; Bascio, D. L.; Orazi, M.; Martini, M.; Peluso, R.; Scarpato, G.; Esposito, A. (2018), "The Seismicity of Ischia Island", Seismological Research Letters, 89 (5): 1750–1760, Bibcode:2018SeiRL..89.1750D, doi:10.1785/0220180084, S2CID 135095225
• Nappi, R.; Alessio, G.; Gaudiosi, G.; Nave, R.; Marotta, E.; Siniscalchi, V.; Civico, R.; Pizzimenti, L.; Peluso, R.; Belviso, P.; Porfido, S. (2018), "The 21 August 2017 Md 4.0 Casamicciola Earthquake: First Evidence of Coseismic Normal Surface Faulting at the Ischia Volcanic Island", Seismological Research Letters, 89 (4): 1323–1334, Bibcode:2018SeiRL..89.1323N, doi:10.1785/0220180063, S2CID 135104688

External links

• The International Seismological Centre has a bibliography and/or authoritative data for this event.

• 2017 earthquakes
• Earthquakes in Italy
• 2017 disasters in Italy
• August 2017 events in Italy
• History of Campania
• Ischia