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Seismic attenuation structure associated with episodic tremor and slip zone beneath Shikoku and the Kii peninsula, southwestern Japan, in the Nankai subduction zone
https://nied-repo.bosai.go.jp/records/2718
https://nied-repo.bosai.go.jp/records/27184b4b1906-a8f1-4f34-9632-ee1523fb41d4
| Item type | researchmap(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-03-30 | |||||||||
| タイトル | ||||||||||
| 言語 | en | |||||||||
| タイトル | Seismic attenuation structure associated with episodic tremor and slip zone beneath Shikoku and the Kii peninsula, southwestern Japan, in the Nankai subduction zone | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 著者 |
Saeko Kita
× Saeko Kita
× Makoto Matsubara
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| 抄録 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | The three-dimensional seismic attenuation structure (frequency-independent Q) beneath southwestern Japan was analyzed using t* estimated by applying the S coda wave spectral ratio method to the waveform data from a dense permanent seismic network. The seismic attenuation (Q(p)(-1)) structure is clearly imaged for the region beneath Shikoku, the Kii peninsula, and eastern Kyushu at depths down to approximately 50km. At depths of 5 to 35km, the seismic attenuation structure changes at the Median tectonic line and other geological boundaries beneath Shikoku and the southwestern Kii peninsula. High-Q(p) zones within the lower crust of the overlying plate are found just above the slip regions at the centers of the long-term slow-slip events (SSEs) beneath the Bungo and Kii channels and central Shikoku. Beneath central Shikoku, within the overlying plate, a high-Q(p) zone bounded by low-Q(p) zones is located from the land surface to the plate interface of the subducting plate. The high-Q(p) zone and low-Q(p) zones correspond to high-V-p and low-V-p zones of previous study, respectively. The boundaries of the high- and low-Q(p) zones are consistent with the segment boundaries of tremors (segment boundaries of short-term SSEs). These results indicated that the locations of the long- and short-term SSEs could be limited by the inhomogeneous distribution of the materials and/or condition of the overlying plate, which is formed due to geological and geographical process. The heterogeneity of materials and/or condition within the fore-arc crust possibly makes an effect on inhomogeneous rheological strength distribution on the interface. | |||||||||
| 言語 | en | |||||||||
| 書誌情報 |
en : JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 巻 121, 号 3, p. 1962-1982, 発行日 2016-03 |
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| 出版者 | ||||||||||
| 言語 | en | |||||||||
| 出版者 | AMER GEOPHYSICAL UNION | |||||||||
| ISSN | ||||||||||
| 収録物識別子タイプ | EISSN | |||||||||
| 収録物識別子 | 2169-9356 | |||||||||
| DOI | ||||||||||
| 関連識別子 | 10.1002/2015JB012493 | |||||||||
