Publication Date:
2017-04-04
Description:
We investigate fault-trapped waves observed at a permanent broad-band station (FAGN)
installed on the San Demetrio Fault, about 20 km southeast of L'Aquila. This fault has the same strike of
the Paganica Fault which was responsible for the MW 6.3, 6 April 2009 earthquake. The two faults
display an en-echelon pattern with a few km offset. We have found that events causing efficient
trapped waves are clustered at the northwestern and southeastern bottom ends of the ruptured
Paganica fault plane. The efficiency of trapped waves at FAGN, which is located about 5 km far from the
ruptured fault plane, indicates that the two faults are linked at depth. This suggests that fault segments
in the study area can be part of a longer and continuous fault system which controls the seismic hazard
of the region. Moreover, we have found that the two earthquake clusters generating the most efficient
trapped waves occur in portions of the fault system with the highest fluid pressure.
Description:
Published
Description:
1-8
Description:
3.1. Fisica dei terremoti
Description:
JCR Journal
Description:
open
Keywords:
6 April 2009 L'Aquila earthquake
;
Paganica Fault
;
normal fault system
;
fault-trapped waves
;
fluid pressure
;
central Apennines
;
04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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