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首页> 外文期刊>Earth, planets and space: EPS >Seismic reflection and bathymetric evidences for the Nankai earthquake rupture across a stable segment-boundary
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Seismic reflection and bathymetric evidences for the Nankai earthquake rupture across a stable segment-boundary

机译：南开地震在稳定段边界上的地震反射和测深证据

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摘要

Seismic reflection profiles reveal steeply landward-dipping splay faults in segment B (the 1946 Nankai earthquake rupture, M 8.3) as well as segment C (the 1944 Tonankai earthquake rupture, M 8.1) of the Nankai subduction zone. The splay faults, branching upward from the plate-boundary interface, almost reach the seafloor, producing seafloor fault scarps. The swath-bathymetry map exhibits a ～200-km-long, remarkable seafloor lineament with which the seafloor fault scarps align in the segments B and C. The seafloor lineament, which we believe is produced by repeating slips on the splay faults, is almost laterally continuous across a stable boundary off Kii Peninsula inbetween the two segments. These seafloor and subsurface features could be due to multiple, simultaneous coseismic slips across the B-C boundary, when subduction thrust earthquakes accompany the coseismic slips on the splay fault. The splay faults are associated with (1) fluid expulsion, (2) dynamic deformation, and (3) tsunami generation.
机译：地震反射剖面揭示了南开俯冲带的B段（1946年南开地震破裂，M 8.3）和C段（1944年南开地震破裂，M 8.1）陡峭的向陆倾斜的断裂。从板块边界界面向上分支的张开断层几乎到达海底，产生海底断层。扫描测深图显示了一个约200公里长的海底地层，海底断层在B和C段与之对齐。我们认为，海床地层几乎是由扇状断层上的重复滑动所产生的。在两段之间的Kii半岛外的一个稳定边界上横向连续。这些海底和地下特征可能是由于俯冲冲断地震伴随同开裂断层上的同震滑动同时穿越Ｂ－Ｃ边界的多个同震滑动引起的。裂纹缺陷与（1）流体排泄，（2）动态变形和（3）海啸产生有关。

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