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Investigating Rupture Direction for Three 2012 Moderate Earthquakes in Northern Italy from Inversion of Peak Ground-Motion Parameters
Language
English
Obiettivo Specifico
4.1. Metodologie sismologiche per l'ingegneria sismica
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
6/102 (2012)
ISSN
0037-1106
Electronic ISSN
1943-3573
Publisher
Seismological Society of America
Pages (printed)
2764–2770
Issued date
December 2012
Abstract
We investigate the possibility of inferring the dominant horizontalrupture
direction for moderate earthquakes from the inversion of peak ground-motion
parameters. To this aim, we adopt a technique that was devised and applied to large
earthquakes for retrieving both the dominant rupture direction and the surface fault
projection to be used with a proper distance metric to refine the ShakeMap computation.
In the present paper, the procedure was applied to three moderate earthquakes
that occurred in 2012 in Northern Italy three days apart: the M 4.2 Pre-Alpi Venete
earthquake on 24 January, the M 4.9 Reggio Emilia earthquake on 25 January, and the
M 5.4 Parma earthquake on 27 January. For two of the three analyzed events, the
technique identifies a dominant horizontal-rupture direction, which is consistent with
the strike directions inferred from the focal mechanisms. For theM 5.4 event, which is
a deep (about 61 km) thrust-faulting mechanism earthquake, the inferred dominant
rupture direction allows identification of the northeast-dipping plane as the fault plane in accordance with the aftershocks distribution.
direction for moderate earthquakes from the inversion of peak ground-motion
parameters. To this aim, we adopt a technique that was devised and applied to large
earthquakes for retrieving both the dominant rupture direction and the surface fault
projection to be used with a proper distance metric to refine the ShakeMap computation.
In the present paper, the procedure was applied to three moderate earthquakes
that occurred in 2012 in Northern Italy three days apart: the M 4.2 Pre-Alpi Venete
earthquake on 24 January, the M 4.9 Reggio Emilia earthquake on 25 January, and the
M 5.4 Parma earthquake on 27 January. For two of the three analyzed events, the
technique identifies a dominant horizontal-rupture direction, which is consistent with
the strike directions inferred from the focal mechanisms. For theM 5.4 event, which is
a deep (about 61 km) thrust-faulting mechanism earthquake, the inferred dominant
rupture direction allows identification of the northeast-dipping plane as the fault plane in accordance with the aftershocks distribution.
Type
article
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