HR: 1340h
AN: S43A-1051    [Abstracts]
TI: Co-seismic deformation of the crustal Mw=6.3, 2001, Chusmiza, Chile event triggered by the subduction Mw=8.4, 2001, Arequipa, Peru earthquake studied using seismological data
AU: * Legrand, D
EM: denis@dgf.uchile.cl
AF: Legrand, Blanco Encalada 2002 , Santiago, 2777 Chile
AB: The 24 July 2001 Chusmiza, Mw=6.3, Chile earthquake is one of the few recent moderate shallow superficial earthquake in Northern Chile. Different kinds of data (short- and long-period seismograms, accelerograms) have been used to better locate this event with corresponding aftershocks. A special care has been taken to constrain their depth and to determine the focal mechanism of the main shock and aftershock, in particular to discriminate the real fault plane among the 2 nodal planes. These data have been used separately in the respective inverse problem approach, and similar results have been obtained. The main shock and main after-shock have very similar focal mechanism (strike-slip faults with a small normal component) and are both superficial (less than 10 km depth). The main shock fault plane solution (strike,dip,rake)=(14°,53°,-163°), dipping eastwards, has been discriminated among the two nodal planes without ambiguity with accelerograms waveform modelling data. It corresponds to the distribution of aftershocks (with a dip of about 50° and a strike of about N30°E), and local lineaments of azimuth about N35°E
DE: 7205 Continental crust (1219)
DE: 7212 Earthquake ground motions and engineering seismology
DE: 7215 Earthquake source observations (1240)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7240 Subduction zones (1207, 1219, 1240)
SC: Seismology [S]
MN: Fall Meeting 2005