Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments
文献类型：期刊论文
| 作者 | Zhu, Gaohua; Yang, Hongfeng; Lin, Jian; Zhou, Zhiyuan; Xu, Min; Sun, Jinlong; Wan, Kuiyuan |
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2019 |
| 卷号 | 218期号:3页码:2122 |
| 关键词 | Seismicity and tectonics Dynamics: seismotectonics Subduction zone processes |
| DOI | 10.1093/gji/ggz272 |
| 英文摘要 | We have conducted the first passive Ocean Bottom Seismograph (OBS) experiment near the Challenger Deep at the southernmost Mariana subduction zone by deploying and recovering an array of 6 broad-band OBSs during December 2016-June 2017. The obtained passive-source seismic records provide the first-ever near-field seismic observations in the southernmost Mariana subduction zone. We first correct clock errors of the OBS recordings based on both teleseismic waveforms and ambient noise cross-correlation. We then perform matched filter earthquake detection using 53 template events in the catalogue of the US Geological Survey and find > 7000 local earthquakes during the 6-month OBS deployment period. Results of the two independent approaches show that the maximum clock drifting was similar to 2 s on one instrument (OBS PA01), while the rest of OBS waveforms had negligible time drifting. After timing correction, we locate the detected earthquakes using a newly refined local velocity model that was derived from a companion active source experiment in the same region. In total, 2004 earthquakes are located with relatively high resolution. Furthermore, we calibrate the magnitudes of the detected earthquakes by measuring the relative amplitudes to their nearest relocated templates on all OBSs and acquire a high-resolution local earthquake catalogue. The magnitudes of earthquakes in our new catalogue range from 1.1 to 5.6. The earthquakes span over the Southwest Mariana rift, the megathrust interface, forearc and outer-rise regions. While most earthquakes are shallow, depths of the slab earthquakes increase from similar to 100 to similar to 240 km from west to east towards Guam. We also delineate the subducting interface from seismicity distribution and find an increasing trend in dip angles from west to east. The observed along-strike variation in slab dip angles and its downdip extents provide new constraints on geodynamic processes of the southernmost Mariana subduction zone. |
| 资助机构 | Hong Kong Research Grant CouncilHong Kong Research Grants Council [14313816]; Faculty of Science at CUHK, Chinese Academy of Sciences [Y4SL021001, QYZDY-SSW-DQC005, 133244KYSB20180029]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41890813, 91628301, 41676042, U1701641, 41576041, 91858207, U1606401]; National Key R&D Program of China [2018YFC0309800, 2018YFC0310100] ; Hong Kong Research Grant CouncilHong Kong Research Grants Council [14313816]; Faculty of Science at CUHK, Chinese Academy of Sciences [Y4SL021001, QYZDY-SSW-DQC005, 133244KYSB20180029]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41890813, 91628301, 41676042, U1701641, 41576041, 91858207, U1606401]; National Key R&D Program of China [2018YFC0309800, 2018YFC0310100] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18278]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhu, Gaohua,Yang, Hongfeng,Lin, Jian,et al. Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2019,218(3):2122, 2135. |
| APA | Zhu, Gaohua.,Yang, Hongfeng.,Lin, Jian.,Zhou, Zhiyuan.,Xu, Min.,...&Wan, Kuiyuan.(2019).Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments.GEOPHYSICAL JOURNAL INTERNATIONAL,218(3),2122. |
| MLA | Zhu, Gaohua,et al."Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments".GEOPHYSICAL JOURNAL INTERNATIONAL 218.3(2019):2122. |
入库方式： OAI收割
来源：南海海洋研究所
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