Mathematics – Logic
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..883s&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 7, p. 883-886
Mathematics
Logic
21
Geodesy And Gravity: Seismic Deformations, Seismology: Seismicity And Seismotectonics
Scientific paper
The largest events of the 1997 Umbria-Marche seismic sequence were the two September 26 earthquakes of Mw=5.7 (00:33 GMT) and Mw=6.0 (09:40 GMT), which caused severe damage and ground cracks in a wide area around the epicenters. We created an ERS-SAR differential interferogram, where nine fringes are visible in and around the Colfiorito basin, corresponding to 25 cm of coseismic surface displacement. GPS data show a maximum horizontal displacement of (14+/-1.8)cm and a maximum subsidence of (24+/-3)cm. We used these geodetic data and the seismological parameters to estimate geometry and slip distribution on the fault planes. Modeled fault depths and maximum slip amplitudes are 6.5 km and 47 cm for the first event and 7 km and 72 cm for the second one, in good agreement with those derived from the seismological data.
Anzidei Marco
Avallone Anna
Baldi Paolo
Boschi Elisa
Briole Pierre
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