HR: 0800h
AN: S51B-0515    [Abstracts]
TI: Source modeling of the Iceland June 2000 seismic sequence
AU: * tocheport, a
EM: tocheport@dtp.obs-mip.fr
AF: OMP DTP UMR5562, 14 avenue Edouard Belin, Toulouse, 31400, France
AU: Chevrot, S
EM: chevrot@dtp.obs-mip.fr
AF: OMP DTP UMR5562, 14 avenue Edouard Belin, Toulouse, 31400, France
AB: We analyze the seismic sequence which occurred in south Iceland in june 2000. This crisis began with the 17 june 2000 Mw=6.6 event, which is a remarkable example of instantaneous dynamic triggering. Indeed, the main shock was followed by three moderate events within a few seconds (8, 26 and 30 s) located within 80 km. A second Mw=6.6 event occurred 4 days later and west of the 17 june 2000 earthquake. We use teleseismic broadband data to recover the spatio-temporal history of the different events of this seismic crisis. We first determine the focal mechanisms of the two main shocks using the well known iterative deconvolution method of Kikuchi and Kanamori (1991). We find two strike-slip mechanisms, which are consistent with the solution given by Harvard but also with the tectonic settings of this region. To investigate the detailed rupture history of these events, we use a back-projection technique (Ishi et al., 2005) which has been applied to several great earthquake such as the giant Mw=9.3 Aceh Sumatra 2004 earthquake or the very large Mw=8 Kokoxili 2001 earthquake (Walker et al., 2005). Similar approaches have also been developped for studying moderate events (Kao and Shan, 2004, 2006).The great advantage of this method is to solve the history of the propagation directly from the signal itself without any a priori on the source. We adapt this technique to global teleseismic data to investigate these two rupture processes. With a similar approach, we also try to better constrain the locations of the main aftershocks of the June 17 event.
DE: 7200 SEISMOLOGY
DE: 7203 Body waves
DE: 7215 Earthquake source observations (1240)
SC: Seismology [S]
MN: 2007 Fall Meeting