TY - JOUR
T1 - Imaging the source area of the 1995 southern Hyogo (Kobe) earthquake (M7.3) using double-difference tomography
AU - Okada, T.
AU - Hasegawa, A.
AU - Suganomata, J.
AU - Zhao, D.
AU - Zhang, H.
AU - Thurber, C.
N1 - Funding Information:
We used data from a temporary seismological observation by the Japanese university group. We also used data from Kyoto University, the University of Tokyo, and Kochi University. We are grateful to all the team members for their efforts in obtaining the data. Discussions with Prof. K. Koketsu, Dr. F. Yamashita and Dr. K. Omura were valuable. We would like to thank Dr. Y. Iio, Dr. S. King and an anonymous reviewer for reviewing our manuscript and their valuable comments. This work was conducted as part of the 21st COE program, ‘Advanced Science and Technology Center for the Dynamic Earth’, at Tohoku University. This work was also partially supported by MEXT.KAKENHI (16740247) and JSPS.KAKENHI (15204037), Japan.
PY - 2007/1/15
Y1 - 2007/1/15
N2 - 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.
AB - 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.
KW - aftershock
KW - asperity
KW - coseismic slip distribution
KW - fault
KW - the 1995 southern Hyogo (Kobe) earthquake
KW - tomography
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U2 - 10.1016/j.epsl.2006.10.022
DO - 10.1016/j.epsl.2006.10.022
M3 - Article
AN - SCOPUS:33845578894
SN - 0012-821X
VL - 253
SP - 143
EP - 150
JO - Earth and Planetary Sciences Letters
JF - Earth and Planetary Sciences Letters
IS - 1-2
ER -