Abstract
Great earthquakes with extending rupture areas, such as the March 11, 2011, off the Pacific coast of Tohoku, Japan, M 9 earthquake, provide opportunities to inspect some details of the pre-shock moment release with the reference of the earthquake preparation and rupture processes. To this end, we investigated the cumulative seismic moment tensor for different segments of the earthquake fault. For the 3 decades time scale, pre-shock accelerating moment release (AMR) can be observed, with potential correlation with the segmentation of earthquake fault.
Highlights
In the assessment of long-to-intermediate-term timedependent seismic hazards, one of the candidate models is the pre-shock accelerating moment release (AMR) model (Bufe et al, 1994; Brehm and Braile, 1998; Bowman and King, 2001) which was once related to the criticalpoint-like behavior of earthquake preparation (Sornette and Sammis, 1995; Bowman et al, 1998; Jaumeand Sykes, 1999; Rundle et al, 2000)
Considering the complexity of earthquake preparation—for instance, the segmentation of earthquake faults—this average misses some important information of stress variation, if the assumption holds that AMR is related to the pre-shock stress evolution
In the present investigation related to the March 11, 2011, off the Pacific coast of Tohoku, Japan, M 9 earthquake (Lay and Kanamori, 2011; http://www.eqh.dpri.kyotou.ac.jp/src/etc/tohoku/), the seismic moment tensor data seems to provide some insights into the pre-shock AMR related to the earthquake preparation and rupture processes
Summary
In the assessment of long-to-intermediate-term timedependent seismic hazards, one of the candidate models is the pre-shock accelerating moment release (AMR) model (Bufe et al, 1994; Brehm and Braile, 1998; Bowman and King, 2001) which was once related to the criticalpoint-like behavior of earthquake preparation (Sornette and Sammis, 1995; Bowman et al, 1998; Jaumeand Sykes, 1999; Rundle et al, 2000). In the present investigation related to the March 11, 2011, off the Pacific coast of Tohoku, Japan, M 9 earthquake (Lay and Kanamori, 2011; http://www.eqh.dpri.kyotou.ac.jp/src/etc/tohoku/), the seismic moment tensor data (http://www.globalcmt.org/) seems to provide some insights into the pre-shock AMR related to the earthquake preparation and rupture processes.
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