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DOI | 10.1029/2020GL088280 |
Overpressured underthrust sediment in the Nankai Trough forearc inferred from transdimensional inversion of high‐frequency teleseismic waveforms | |
Takeshi Akuhara; Takeshi Tsuji; Takashi Tonegawa | |
2020-07-17 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | Active‐source seismic surveys have resolved the fine‐scale P‐wave velocity (Vp) of the subsurface structure in subduction forearcs. In contrast, the S‐wave velocity (Vs) structure is poorly resolved despite its usefulness in understanding rock properties. This study estimates Vp and Vs structures of the Nankai Trough forearc, by applying transdimensional inversion to high‐frequency teleseismic waveforms. As a result, a thin (∼1 km) low‐velocity zone (LVZ) is evident at ∼6 km depth beneath the sea level, which is located ~3 km seaward from the outer ridge. Based on its high Vp/Vs ratio (∼2.5) and comparison to an existing seismic reflection profile, we conclude that this LVZ reflects a high pore pressure zone at the upper portion of the underthrust sediment. We infer that this overpressured underthrust sediment hosts slow earthquake activities, and that accompanied strain release helps impede coseismic rupture propagation further updip. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/284254 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Takeshi Akuhara,Takeshi Tsuji,Takashi Tonegawa. Overpressured underthrust sediment in the Nankai Trough forearc inferred from transdimensional inversion of high‐frequency teleseismic waveforms[J]. Geophysical Research Letters,2020. |
APA | Takeshi Akuhara,Takeshi Tsuji,&Takashi Tonegawa.(2020).Overpressured underthrust sediment in the Nankai Trough forearc inferred from transdimensional inversion of high‐frequency teleseismic waveforms.Geophysical Research Letters. |
MLA | Takeshi Akuhara,et al."Overpressured underthrust sediment in the Nankai Trough forearc inferred from transdimensional inversion of high‐frequency teleseismic waveforms".Geophysical Research Letters (2020). |
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