WEKO3
アイテム
Depth-dependent mode of tremor migration beneath Kii Peninsula, Nankai subduction zone
https://nied-repo.bosai.go.jp/records/4557
https://nied-repo.bosai.go.jp/records/455752e31d8f-5325-4986-a80a-13cf93d05058
| Item type | researchmap(1) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-03-30 | |||||||||||||
| タイトル | ||||||||||||||
| 言語 | en | |||||||||||||
| タイトル | Depth-dependent mode of tremor migration beneath Kii Peninsula, Nankai subduction zone | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | eng | |||||||||||||
| 著者 |
Kazushige Obara
× Kazushige Obara
× Takanori Matsuzawa
× Sachiko Tanaka
× Takuto Maeda
|
|||||||||||||
| 抄録 | ||||||||||||||
| 内容記述タイプ | Other | |||||||||||||
| 内容記述 | We investigated the migration mode of deep non-volcanic tremor activity beneath Kii Peninsula, southwest Japan. Major tremor episodes are characterized by long-term migration with a velocity of about 10 km/day, propagating along the strike of the subducting plate. Similar tremor migration in Cascadia is accompanied by reverse propagation at speeds on the order of 100 km/day and much faster slip-parallel migration at speeds on the order of 1000 km/day. We systematically searched for migrating tremor with clear linearity in space and time. As a result, we found tremor migrations at speeds ranging from 1 to 60 km/hr depending on the along-dip position in the tremor zone. The observed decrease in migration speed with increasing measurement time scale suggests that migration is controlled by a diffusion process. The along-strike migration at lower speeds, including both forward and backward directions relative to the long-term migration episode, is concentrated at the updip side of the tremor zone, whereas the faster slip-parallel migration is distributed over the entire zone. The long-term migration seems to consist of and be excited by the propagation of along-strike creep at the updip part. The concentration of along-strike migrating tremor sequences at the updip side may reflect the existence of abundant fluid that accumulates at the corner of the mantle wedge. The faster slip-parallel migrations represent projections of along-strike fluctuations in slip pulse propagation controlled by striations along the plate interface. Citation: Obara, K., T. Matsuzawa, S. Tanaka, and T. Maeda (2012), Depth-dependent mode of tremor migration beneath Kii Peninsula, Nankai subduction zone, Geophys. Res. Lett., 39, L10308, doi:10.1029/2012GL051420. | |||||||||||||
| 言語 | en | |||||||||||||
| 書誌情報 |
en : GEOPHYSICAL RESEARCH LETTERS 巻 39, 発行日 2012-05 |
|||||||||||||
| 出版者 | ||||||||||||||
| 言語 | en | |||||||||||||
| 出版者 | AMER GEOPHYSICAL UNION | |||||||||||||
| ISSN | ||||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||||
| 収録物識別子 | 0094-8276 | |||||||||||||
| DOI | ||||||||||||||
| 関連識別子 | 10.1029/2012GL051420 | |||||||||||||
