Source process with heterogeneous rupture velocity for the 2011 tohoku-oki earthquake based on 1-hz gps data
文献类型：期刊论文
| 作者 | Wang,Zhen1; Kato,Teruyuki1; Zhou,Xin1,2,3; Fukuda,Jun’ichi1 |
| 刊名 | Earth, planets and space
 |
| 出版日期 | 2016-11-28 |
| 卷号 | 68期号:1 |
| 关键词 | Rupture velocity High-rate gps Rupture process Tohoku-oki earthquake |
| ISSN号 | 1880-5981 |
| DOI | 10.1186/s40623-016-0572-4 |
| 通讯作者 | Wang,zhen(wangzhen@eri.u-tokyo.ac.jp) |
| 英文摘要 | Abstracta rupture model with varying rupture front expansion velocity for the march 11, 2011, tohoku-oki earthquake was obtained by the joint inversion of high-rate global positioning system (gps) data and ocean bottom gps/acoustic (ob-gps) data. the inverted rupture velocity with a complex distribution gradually increases near the hypocenter and shows rapid rupture expansion at the shallowest part of the fault. the entire rupture process, which lasted 160?s, can be divided into three energy release stages, based on the moment rate function. the preferred slip model, showing a compatible relationship with aftershocks, has a primary asperity concentrated from the hypocenter to the trench and a small asperity located on the southern fault. source time functions for subfaults and temporal rupture images suggest that repeated slips occurred in the primary rupture, which is consistent with that from seismic waveforms. our estimated maximum slip and total seismic moment are ~65?m and 4.2?×?1022?nm (mw 9.0), respectively. the large slip, stress drop, and rupture velocity are all concentrated at shallow depths, which indicates that the shallow part of the fault radiated high-frequency as well as low-frequency seismic waves.graphical abstractfigure (a) shows the preferred cumulative slip distribution with a large slip concentrated in the shallow part of the fault near the trench, northeast of the hypocenter. the estimated maximum slip is ~65 m, and the seismic moment estimated with the variable rigidities based on the layered velocity structure used for green’s function computation is ~4.2 × 1022 nm (mw 9.0). the region with slip of at least 5 m spans 150 km down-dip from the top boundary of the fault, corresponding to the depth from 10 km to 41 km, and extends along the strike for approximately 300 km. figure (b) shows a heterogeneous rupture velocity distribution ranging from the minimum of 1.3 km/s to the maximum of 3.5 km/s on the fault plane. the rupture velocity within the vicinity of hypocenter shows a regular pattern, gradually increasing from 1.0 km/s to 2.0 km/s with increasing distance from the hypocenter. the rupture at the shallowest part of the fault significantly speeded up, with a velocity of larger than 3.0 km/s, consistent with that obtained by lee et al. (2011). as for the southern part of the fault, 120 km away from the hypocenter, the rupture velocity is much smaller than in other regions, ranging from 1.0 km/s to 2.0 km/s. it indicates that the rupture front firstly arrived at the shallow part of the fault where large slip occurred, and then spread to the surrounding area. |
| 语种 | 英语 |
| WOS记录号 | BMC:10.1186/S40623-016-0572-4 |
| 出版者 | Springer Berlin Heidelberg |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2374345 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Wang,Zhen |
| 作者单位 | 1.University of Tokyo; Earthquake Research Institute 2.Chinese Academy of Sciences; Key Laboratory of Computational Geodynamics 3.China Earthquake Administration; Institute of Crustal Dynamics |
| 推荐引用方式 GB/T 7714 | Wang,Zhen,Kato,Teruyuki,Zhou,Xin,et al. Source process with heterogeneous rupture velocity for the 2011 tohoku-oki earthquake based on 1-hz gps data[J]. Earth, planets and space,2016,68(1). |
| APA | Wang,Zhen,Kato,Teruyuki,Zhou,Xin,&Fukuda,Jun’ichi.(2016).Source process with heterogeneous rupture velocity for the 2011 tohoku-oki earthquake based on 1-hz gps data.Earth, planets and space,68(1). |
| MLA | Wang,Zhen,et al."Source process with heterogeneous rupture velocity for the 2011 tohoku-oki earthquake based on 1-hz gps data".Earth, planets and space 68.1(2016). |
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来源：中国科学院大学
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