Imaging the source area of the 1995 southern Hyogo (Kobe) earthquake (M7.3) using double-difference tomography
Imaging the source area of the 1995 southern Hyogo (Kobe) earthquake (M7.3) using double-difference tomography
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DOI：
10.1016/j.epsl.2006.10.022
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发表时间：
2007-01-15
影响因子：
5.3
通讯作者：
Thurber, C.
中科院分区：
文献类型：
--
作者：
Okada, T.;Hasegawa, A.;Thurber, C.
为了了解内陆地震的发生过程，我们测定了1995年日本西南部兵库县南部（科比）地震（M7.3）震源区及其周围的地震速度结构。我们采用双差（DD）层析成像方法[Zhang，H。和C.瑟伯双差层析成像：方法及其在加州海沃德断层上的应用。Bull Seism Soc Am 93（2003）1875-1889.]我们反演了余震密集的临时地震网络和日本大学常规操作的地震网络记录的到达时间。结果表明：（1）沿着断层或沿着余震走向分布有几公里宽的低速带，表明1995年地震的断层主要位于低速带内。(2)低速带内的速度降低量沿断层走向沿着变化。大多数大的滑动区（粗糙体）似乎对应于相对于断层周围的高速区，而不是低速区。(c)2006 Elsevier B. V.保留所有权利。
To understand the generation process of inland earthquake, we determined the seismic velocity structure in and around the source area of the 1995 southern Hyogo (Kobe) earthquake (M7.3) in SW Japan. We adopted the double-difference (DD) tomography method [Zhang, H. and C. Thurber. Double-Difference Tomography: the method and its application to the Hayward Fault, California. Bull Seism Soc Am 93 (2003) 1875-1889.]. We inverted arrival times recorded by a dense temporary seismic network for aftershocks and seismic networks routinely operated by Japanese Universities. Obtained results are summarized as follows: (1) Low-velocity zones of a few kilometers' width are distributed along the fault or along the aftershock alignment, suggesting that the fault of the 1995 earthquake is located primarily in a low-velocity zone. (2) Amount of velocity decrease within this low-velocity zone varies along the strike of the fault. Most of large slip areas (asperities) seem to correspond to higher velocity areas relative to the surroundings on the fault, rather than to lower velocity areas. (c) 2006 Elsevier B.V. All rights reserved.