Abstract
Abstract The source rupture process during the 2007 Noto Hanto earthquake is inferred using a broadband waveform inversion technique based on the empirical Green’s function and the simulated annealing. The spatio-temporal distributions of the moment density and rise time on the fault are estimated from displacement motions in the frequency range from 0.1 to 2 Hz, and effective stress distribution is derived from the velocity motions in the frequency range up to 5 Hz. Results from the displacement inversion indicate that the seismic moment is mainly released from a single asperity with an area of 10 × 10 km2, and total moment release is estimated to be about 1.3 × 1019 N m. The velocity inversion shows that the high effective stress area distributes on and around the asperity, in particular at the deep periphery of it. The broadband strong motions determined using the conventional source model composed of only the moment distribution are compared with those calculated by considering both moment and effective stress separately. The fit between observed acceleration motions and synthetic ones from both source models are generally good in the frequency range up to 10 Hz, and no evident difference is recognized.
Highlights
The Noto-Hanto earthquake (MJMA 6.9) occurred on 25March 2007 on the Noto peninsula, Ishikawa prefecture on the Coast of the Japan Sea
The spatio-temporal distributions of the moment density and rise time on the fault are estimated from displacement motions in the frequency range from 0.1 to 2 Hz, and effective stress distribution is derived from the velocity motions in the frequency range up to 5 Hz
Since tens of strong-motion observation stations are distributed on and around the source area, installed by the National Research Institute for Earth Science and Disaster Prevention, called K-NET (Kinoshita, 1998) and KiK-net (Aoi et al, 2000), and by the Japan Meteorological Agency (JMA), this event is an appropriate case for investigating the detailed source rupture process generating strong motions, though the station coverage might not be satisfactory
Summary
The Noto-Hanto earthquake (MJMA 6.9) occurred on 25March 2007 on the Noto peninsula, Ishikawa prefecture on the Coast of the Japan Sea. In this article I apply the source inversion scheme composed of the empirical Green’s function method and simulated annealing (Shiba and Irikura, 2005) to broadband strong-motion data from the 2007 Noto Hanto earthquake and separately estimate the spatio-temporal distributions of the seismic moment and effective stress on the fault.
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