Index Geophysics

Faulting mechanism of the Campania–Lucania 1980 earthquake, Italy, from high-resolution, 3D velocity structure, aftershock relocation, fault-plane solutions, and post-seismic deformation modeling

<p>This study performs a detailed reconstruction of the rupture mechanism of the 1980 Campania–Lucania (southern Italy) earthquake. This is achieved by relocation of the main event through computation of fault-plane solutions of the aftershocks, P-wave velocity inversion, and analysis of post-seismic ground deformation, which provide an overall picture of the faulting mechanism. All of these data are in favor of a complex rupture mechanism, as already identified by many studies, which consists of three separate events. The present study defines a graben-like rupture, with the first event rupturing a (>20-km-long) segment of a large, high-angle, NE-dipping, SE-NW-striking, normal fault. The two successive ruptures occurred separately, the first along the southern segment, and the second along the northern segment, of a complementary SW-dipping, normal fault. This mechanism is well evidenced by the revised location of the hypocenter of the main event, and the location of the aftershocks and their fault-plane solutions, as well as by the underlying three-dimensional P-wave velocity structure. The model proposed by Amoruso et al. [2005a] that was based on the inversion of co-seismic vertical displacement data is confirmed by the present analyses, as it satisfies all of the available experimental observations, and better constrains the location and fault-plane solutions of the aftershocks, the velocity discontinuities, and the rupture observations at the surface. This conclusion is also supported by analyses of the post-seismic data.</p>

Roberto Scarpa

Bellina Di Lieto

Luca Crescentini

Antonella Amoruso

Campania-Lucania 1980 earthquake

Meteorology. Climatology

QC851-999

Geophysics. Cosmic physics

QC801-809

Istituto Nazionale di Geofisica e Vulcanologia (INGV)

2011-06-01T00:00:00Z

article

10.4401/ag-4984

1593-5213

2037-416X

https://doaj.org/article/6795c43ce2c14eb08e0c3091283b70a1

Annals of Geophysics, Vol 54, Iss 6 (2011)

EN

http://www.annalsofgeophysics.eu/index.php/annals/article/view/4984

https://doaj.org/toc/1593-5213

https://doaj.org/toc/2037-416X

Journal Licence: CC BY