Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1069m&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 8, p. 1069-1072
Physics
12
Seismology: Earthquake Parameters, Structural Geology: Fractures And Faults, Seismology: Theory And Modeling
Scientific paper
The Umbria-Marche region in central Italy experienced a sequence of shallow earthquakes in late 1997, including three mainshocks on September 26th (Ms 5.5 and 5.9) and October 14th (Ms 5.5). This seismic sequence illustrates the relationships between small-scale active faults and moderate-magnitude earthquakes. We suggest that a small-scale active fault corresponds to a ``fault fragment'' and that it refers to the fault area required for producing a coseismic deformation at the ground surface. The seismic activity and related three mainshocks occurred along three fault fragments which total ~25 km in length and show a listric geometry at depth. Fault fragments are laterally controlled by pre-existing transverse fold-and-thrust structures and may constitute a major component of the seismic strain release in active continental regions.
Bosi Vittorio
Camelbeeck Thierry
Meghraoui* Mustapha
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