Total analysis of the 1993 Hokkaido Nansei‐Oki Earthquake using seismic wave, tsunami, and geodetic data
Total analysis of the 1993 Hokkaido Nansei‐Oki Earthquake using seismic wave, tsunami, and geodetic data
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使用地震波、海啸和大地测量数据对 1993 年北海道南西冲地震进行综合分析
DOI：
10.1029/94gl02787
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发表时间：
1995
影响因子：
5.2
通讯作者：
L. Ruff
中科院分区：
文献类型：
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作者：
Y. Tanioka;K. Satake;L. Ruff
利用地震波、海啸和大地测量资料估计了1993年7月12日日本北海道南关地震的断层几何和滑动分布。由P波反演矩张量率函数显示，一个节面向西浅倾斜，另一个节面向东陡峭倾斜。最佳深度估计为10-15公里。震源时程由持续时间为10 S的初始脉冲和2×10~(20)Nm的力矩释放组成，随后发生至少40个S的复杂破裂。质心矩张量解显示一个节面向东浅倾斜，另一个节面向西陡峭倾斜。总的地震矩估计为5.5×1020 Nm(MW 7.8)。大鱼岛的大地测量数据和日本和韩国的海啸波形的联合反演表明，最大的滑动约为6米，发生在震中以南的一个小区域。这对应于断裂面向西倾斜较浅的初始破裂。最北的断层向东倾斜的滑动约为2m，向西倾斜的南部断层的滑动超过3m，由滑动分布估计的总地震矩为4.9×1020 Nm，与CMT反演的估计值相似。
The fault geometry and slip distribution of the Hokkaido Nansei-oki, Japan, earthquake of July 12, 1993 are estimated using seismic wave, tsunami, and geodetic data. The Moment Tensor Rate Function inversion from P waves shows one nodal plane shallowly dipping to the west and the other nodal plane steeply dipping to the east. The best depth is estimated as 10–15 km. The source time history consists of an initial pulse with a duration of 10 s and moment release of 2 × 1020 Nm, followed by a complex rupture for at least 40 s. The Centroid Moment Tensor (CMT) solution shows one nodal plane shallowly dipping to the east and the other steeply dipping to the west. The overall seismic moment is estimated as 5.5 × 1020 Nm (Mw 7.8). The joint inversion of geodetic data on Okushiri Island and tsunami waveforms in Japan and Korea shows that the largest slip, about 6 m, occurred at a small area just south of the epicenter. This corresponds to the initial rupture on a fault plane dipping shallowly to the west. The slip on the northernmost fault, dipping to the east, is about 2 m. The slips on the southern faults, dipping steeply to the west, are more than 3 m. Total seismic moment of 4.9 × 1020 Nm, estimated from the slip distribution, is similar to the estimate from CMT inversion.
山田一郎：J.Invest.Dermatol.88。
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