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Contribution to knowledge regarding the sources of earthquakes on the island of Ischia (Southern Italy)

Author

Listed:
  • Elena Cubellis

    (Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano)

  • Giuseppe Luongo

    (Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano
    University of Naples “Federico II”)

  • Francesco Obrizzo

    (Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano)

  • Vincenzo Sepe

    (Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Nazionale Terremoti)

  • Umberto Tammaro

    (Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano)

Abstract

This paper analyses data regarding the seismicity and ground deformations of the island of Ischia. The goal is to describe these phenomena as a space–time process, exploring the mechanism as a whole in order to answer questions concerning why and how historical earthquakes occurred and the geological constrains at the time of the earthquake of 21 August 2017. According to our analysis, the genesis of earthquakes in the island may be due either to regional tensile tectonics or to increased pressure in a shallow magma source. The eruptive rest following the 1302 Arso lava flow, the seismic silence from 1883 and the ground sinking recorded at least from the end of the nineteenth century suggest a decline of pressure in the shallow magma source and in the action of the stress field generated by the spreading of the Tyrrhenian Basin. The mechanism that can generate the observed ground deformation field and seismicity is the gravitational and thermal loading of the island, because the load of the massif of Mt. Epomeo onto its hot substratum may induce the gravitational spreading that would have produced its sliding southwards and its rotation northwards. The surface of detachment plunges towards the south and emerges at a high angle at the northern edge of Mt. Epomeo, where coseismic ground effects and the greatest damage have been observed. This mechanism that generated the 21 August 2017 earthquake could be extended to historical seismicity.

Suggested Citation

  • Elena Cubellis & Giuseppe Luongo & Francesco Obrizzo & Vincenzo Sepe & Umberto Tammaro, 2020. "Contribution to knowledge regarding the sources of earthquakes on the island of Ischia (Southern Italy)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 100(3), pages 955-994, February.
    • Handle: RePEc:spr:nathaz:v:100:y:2020:i:3:d:10.1007_s11069-019-03833-8
    DOI: 10.1007/s11069-019-03833-8
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    References listed on IDEAS

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    1. E. Cubellis & S. Carlino & S. Carlino & S. Carlino & E. Cubellis, 2004. "Management of Historical Seismic Data Using GIS: The Island of Ischia (Southern Italy)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 33(3), pages 379-393, November.
    2. S. Carlino & E. Cubellis & A. Marturano, 2010. "The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 52(1), pages 231-247, January.
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    Cited by:

    1. Gemma Aiello & Marco Sacchi, 2022. "New morpho-bathymetric data on marine hazard in the offshore of Gulf of Naples (Southern Italy)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 111(3), pages 2881-2908, April.

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