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タイトル: | Source Rupture Process of the Tecomán, Colima, Mexico Earthquake of 22 January 2003, Determined by Joint Inversion of Teleseismic Body-Wave and Near-Source Data |
著者: | Yagi, Yuji Mikumo, Takeshi Pacheco, Javier Reyes, Gabriel |
発行日: | Oct-2004 |
出版者: | Seismological Society of America |
誌名: | Bulletin of the Seismological Society of America |
巻: | 94 |
号: | 5 |
開始ページ: | 1795 |
終了ページ: | 1807 |
抄録: | The spatial and temporal slip distribution of the Tecomán, Colima, Mexico earthquake is estimated from near-source strong-motion and teleseismic body-wave data. To perform a stable inversion, we applied smoothing constraints and determined their optimal relative weights on the observed data using an optimized Akaike's Bayesian information criterion (ABIC). The source parameters are as follows: (strike, dip, slip) = (300°, 20°, 93°), seismic moment M0 = 2.3 × 10[20] N m; source duration = 30 sec; along-strike distance = 35 km; along-dip distance = 70 km. We found that the rupture process can be divided into three stages: the rupture nucleated near the hypocenter (stage I), then it broke the first asperity centering about 15 km southwest from the epicenter (stage II); and the rupture propagated to the northeast and the second asperity was broken (stage III). We also estimated the shear-stress change due to the rupture process of the mainshock on and around the major fault zone. It appears that one cluster of aftershocks for the first 5 days, which took place in and adjacent to the zones of stress, increased due to the fault rupture during the mainshock, but overall correlation between the aftershock location and the stress pattern is not clear. |
著作権等: | © 2004 by the Seismological Society of America |
URI: | http://hdl.handle.net/2433/193413 |
DOI(出版社版): | 10.1785/012003095 |
関連リンク: | http://www.bssaonline.org/content/94/5/1795 |
出現コレクション: | 三雲 健 |
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