Using publicly available GPS solutions for fast estimations of first-order source details from coseismic deformations

Cannelli, Valentina and Melini, Daniele and Devoti, Roberto and Piersanti, Antonio (2011) Using publicly available GPS solutions for fast estimations of first-order source details from coseismic deformations. Annals of geophysics, 54 (4). pp. 454-461. ISSN 2037-416X

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Abstract

We here explore the potential use of publicly available GPS solutions to obtain first-order constraints on a source model immediately following an earthquake, within the limits of GPS solution timeliness and near-field coverage. We use GPS solutions from the Scripps Orbit and Permanent Array Center to carry out simple inversions of the coseismic displacement field induced by the 2010 Maule earthquake (Chile), by inferring the seismic moment and the rake angle of a fixed-geometry seismic source. The rake angle obtained from the inversion (λ=117.8°) is consistent with seismological estimates. The seismic moment, which corresponds to a moment magnitude Mw=8.9, is about 1.6 times greater than seismological estimates. This suggests that as in other recent megathrust events, a consistent fraction of the energy was released aseismically. In this respect, the additional information obtained from GPS can help to provide a better estimate of the weight of the aseismic contribution to the energy release.

Item Type:	Article
Uncontrolled Keywords:	Geodesy, Tectonophysics, GPS, Coseismic deformations, Source inversion, Maule earthquake
Subjects:	500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse > 526 Geografia matematica > 526.1 Geodesia 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.8 Geologia strutturale (Classificare qui la deformazione, il diastrofismo, l'epirogenesi, la tettonica) (Classificare la Geomorfologia in 551.41) 600 Tecnologia - Scienze applicate > 620 Ingegneria e attivita' affini > 621 Fisica applicata; Ingegneria meccanica > 621.3 Ingegneria elettrotecnica; Illuminazione; Superconduttivita'; Ingegneria magnetica; Ottica applicata; Tecnologia parafotica; Elettronica; Ingegneria delle comunicazioni; Elaboratori > 621.36 Ingegneria ottica (classificare qui l'Ottica applicata; le opere sulla tecnologia dell'infrarosso e dell'ultravioletto insieme) > 621.367 Fotografia tecnica e Foto-ottica (classificare qui l'elaborazione delle immagini, l'elaborazione ottica dei dati) > 621.3678 Tecnologia del rilevamento a distanza
Depositing User:	Tania Marcelli
Date Deposited:	23 Dec 2011 11:57
Last Modified:	23 Dec 2011 11:57
URI:	http://eprints.bice.rm.cnr.it/id/eprint/3825

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