Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..121...39m&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 121, Issue 1-2, p. 39-58.
Physics
Scientific paper
We study the complex activity of the 1994 Hokkaido Toho-oki earthquake sequence based on strong motion records and teleseismic data. First we examine S-wave acceleration spectra of the aftershocks by comparison with that of the main shock; the main shock (Mw=8.2), an intra-slab earthquake, has been characterized by strong radiation of high-frequency seismic waves. From different shapes of the spectral ratios of the aftershocks to the main shock, the aftershocks can be classified into three types. Next we redetermine the source parameters (focal depth, seismic moment and source duration) for larger events by waveform modeling of teleseismic P-waves. The hypocentral locations and stress drops estimated from these parameters show that the three aftershock types fall into different categories of subduction zone earthquakes; intra-slab, relatively deep plate-boundary, and shallow plate-boundary earthquakes. Finally, we estimate source spectra for three different earthquake categories after correcting S-wave acceleration spectra for the attenuation effect. The source spectrum at high frequencies is modeled by using a high-cut filter whose parameters are a cut-off frequency, fmax and a decay rate. The source spectrum of intra-slab earthquakes has high fmax and small decay rate; due to this feature and the high stress drop, intra-slab earthquakes radiate strong high-frequency seismic waves. Through this study, we demonstrate that the 1994 Hokkaido Toho-oki earthquake sequence has the complex activity of intra-slab and plate-boundary earthquakes.
Morikawa Naoto
Sasatani Tsutomu
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