The 1993 Kushiro-Oki, Japan, Earthquake: A high stress-drop event in a subducting slab
The 1993 Kushiro-Oki, Japan, Earthquake: A high stress-drop event in a subducting slab
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1993 年日本钏路隐地震：俯冲板片中的高应力降事件
DOI：
10.1029/93gl02864
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发表时间：
1993
影响因子：
5.2
通讯作者：
Yashuhiro Yoshida
中科院分区：
文献类型：
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作者：
M. Takeo;S. Ide;Yashuhiro Yoshida
1993年钏路-冲地震（Mw; 7.6）的空间滑动分布无疑是约束使用近场数据和详细的余震分布。这次地震的特殊之处在于，断层面上的滑动被限制在北海道俯冲板片的双地震带上下平面之间的极小区域内（约40 km × 20 km）。该区地震总矩为3.3 × 10 ~（20）Nm，平均滑动量为5.5m，应力降为4.2 × 10 ~（70）Pa。这次地震表明，在北海道下面的双地震带平面之间的板块区域足够强大，可以承受约4 × 107 Pa的应力。该事件的滑动运动与南千岛海沟沿着的板片退移相一致，可能代表俯冲板片可能发生退移的过程。
A spatial slip distribution of the 1993 Kushiro-Oki earthquake (Mw; 7.6) is undoubtedly constrained using near-field data and the detailed aftershock distribution. This earthquake has peculiar features in that the slip on the fault plane is restricted within an extremely small area (about 40 km × 20 km) between the upper and lower planes of the double seismic zone in the subducting slab beneath Hokkaido. The total seismic moment, averaged slip, and stress-drop in this area are 3.3 × 1020 Nm, 5.5 m, and 4.2 × 107 Pa, respectively. This earthquake indicates that the region of the slab between the planes of the double seismic zone beneath Hokkaido is strong enough to sustain a stress of about 4 × 107 Pa. The slip motion of this event is consistent with retrograde slab migration along the Southern Kuril trench, and may represent a process by which retrograde motion of subducting slabs could occur.