WEKO3
アイテム
CMT inversion for small-to-moderate earthquakes applying to dense short-period OBS array at off Ibaraki region
https://nied-repo.bosai.go.jp/records/3124
https://nied-repo.bosai.go.jp/records/31245071aa2e-1703-446b-bfed-f87f57449104
| Item type | researchmap(1) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-04-27 | |||||||||||||||||
| タイトル | ||||||||||||||||||
| 言語 | en | |||||||||||||||||
| タイトル | CMT inversion for small-to-moderate earthquakes applying to dense short-period OBS array at off Ibaraki region | |||||||||||||||||
| 著者 |
Lina Yamaya
× Lina Yamaya
× Kimihiro Mochizuki
× Takeshi Akuhara
× Shunsuke Takemura
× Masanao Shinohara
× Tomoaki Yamada
|
|||||||||||||||||
| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||
| 内容記述 | We conducted centroid moment tensor (CMT) inversion for small-to-moderate aftershocks in the off Ibaraki region of the 2011 off the Pacific coast of Tohoku earthquake. In this study, we used high-frequency (0.4–1.0 Hz) seismograms from a dense array of short-period ocean bottom seismometers (OBSs) and a reliable three-dimensional (3-D) seismic velocity model. Higher frequency analysis and dense OBS arrays offer CMT solutions with high spatial resolutions. Since our OBS array observed aftershocks occurring immediately following the 2011 off the Pacific coast of Tohoku earthquake, we determined 536 CMT solutions for small-to-moderate aftershocks in the off Ibaraki region (JMA-scale magnitudes of 2.5–4.0). According to our CMT solutions, characteristics of the aftershock activities in the off Ibaraki region are classified into 5 groups: (1) thrust earthquakes, which are considered as interplate earthquakes, separated by the large slip area of the 2011 Ibaraki-oki earthquake (the largest M w 7.6 aftershock of the 2011 off the Pacific coast of Tohoku earthquake) and the tectonic tremors; (2) intraslab strike-slip earthquakes located at the north of the fault area of the 2011 Ibaraki-oki earthquake; (3) intraslab normal-fault earthquakes, which suggest a tensional stress field within the subducting Pacific Plate due to the plate bending by the overriding Philippine Sea Plate; (4) various earthquake focal mechanisms above a subducting seamount, which suggest the 3-D complex fractures; and (5) normal-fault earthquakes shallower than the interplate earthquakes, which were possibly caused by the heterogeneity of the subducting seamount. Graphical Abstract: [Figure not available: see fulltext.]. | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 書誌情報 |
en : Earth, Planets and Space 巻 74, 号 1, 発行日 2022-11-08 |
|||||||||||||||||
| ISSN | ||||||||||||||||||
| 収録物識別子タイプ | EISSN | |||||||||||||||||
| 収録物識別子 | 1880-5981 | |||||||||||||||||
| DOI | ||||||||||||||||||
| 関連識別子 | 10.1186/s40623-022-01721-3 | |||||||||||||||||
