EGU22-1495, updated on 27 Mar 2022
https://doi.org/10.5194/egusphere-egu22-1495
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The 2017 Ischia Earthquake (Southern Italy): Source Mechanism and Rupture Model From the inversion of a Near-Source Strong Motion Record

Sahar Nazeri1, Aldo Zollo1, Guido Maria Adinolfi2, Ortensia Amoroso3, and Matteo Picozzi1
Sahar Nazeri et al.
  • 1University of Naples Federico II, Department of Physics, Napoli, Italy (nazeri.sahar@gmail.com)
  • 2Department of Science and Technology, University of Sannio, 82100 Benevento, Italy
  • 3Department of Physics “E. R. Caianiello,” Università degli Studi di Salerno, Fisciano, 84084 Salerno, Italy

With the aim to investigate the rupture complexity and the radiated wave field of 2017, Mw 3.9, Ischia earthquake, south-west of Naples (Italy), we used finite-fault modeling to invert the near-source (<1-km epicentral distance) horizontal component velocity records of the accelerometric station (IOCA)
and searched for the best-fit kinematic rupture parameters. This analysis showed that the rupture nucleated at about 600 m west of IOCA and 1.1-km depth, along a 1 km, NW-SE striking fault (i.e., thrust with right-lateral component), with a rupture velocity of about 0.7 km/s. The retrieved rupture model coupled with multipath reverberations effects related to a thin, low-velocity near-surface volcanic sedimentary layer, well explains the observed long ground motion duration and the large amplitudes recorded all over the island. Finally, the apparent source time function (STF), obtained from inverse modeling using a theoretical Green’ function (GF), is validated by implementing an empirical GF (EGF) analysis.

How to cite: Nazeri, S., Zollo, A., Maria Adinolfi, G., Amoroso, O., and Picozzi, M.: The 2017 Ischia Earthquake (Southern Italy): Source Mechanism and Rupture Model From the inversion of a Near-Source Strong Motion Record, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1495, https://doi.org/10.5194/egusphere-egu22-1495, 2022.

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