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Microseisms Generated by Super Typhoon Megi in the Western Pacific Ocean
Lin, JM; Lin, J; Xu, M; jlin@whoi.edu; mxu@scsio.ac.cn
2018
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷号122期号:12页码:9518-9529
摘要Microseisms generated by the super typhoon Megi (13-24 October 2010) were detected on both land-based and island-based seismic stations. We applied temporal frequency spectrum analysis to investigate the temporal evolution of the microseisms. When Megi was over the deep basins of the Philippine Sea, only weak microseisms with short-period double frequency (SPDF, similar to 0.20-0.40 Hz) were observed. However, after Megi traveled into the shallower waters of the South China Sea, microseisms with both long-period double frequency (LPDF, similar to 0.12-0.20 Hz) and SPDF were recorded. The excitation source regions of the microseisms were analyzed using seismic waveform records and synthetic modeling in frequency domain. Results reveal that part of the LPDF microseisms were excited in coastal source regions, while the intensity of both LPDF and SPDF microseisms correlated well with the distance from seismic stations to the typhoon center. Synthetic computations of equivalent surface pressure and corresponding microseisms show that the wave-to-wave interaction induced by coastal reflection has primary effects on microseismic frequency band of similar to 0.10-0.20 Hz. The coastal generation of the dispersive LPDF microseisms is also supported by the observation of ocean swells induced by Megi through the images of C-band ENVISAT-ASAR satellite during its migration process. Two source regions of the microseisms during the life span of Megi are finally distinguished: One was mainly located in the left-rear quadrant of the typhoon center that generated both LPDF and SPDF microseisms at shallow seas, while the other one was near the coasts that generated mostly LPDF microseisms.
部门归属[Lin, Jianmin] Zhejiang Ocean Univ, Marine Acoust & Remote Sensing Lab, Zhoushan, Peoples R China; [Lin, Jian] Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA; [Lin, Jian; Xu, Min] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
学科领域Oceanography
关键词[WOS]microseisms ; typhoon ; ocean wave ; source region ; generation mechanism
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17167
专题中科院边缘海地质重点实验室
通讯作者jlin@whoi.edu; mxu@scsio.ac.cn
推荐引用方式
GB/T 7714
Lin, JM,Lin, J,Xu, M,et al. Microseisms Generated by Super Typhoon Megi in the Western Pacific Ocean[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,122(12):9518-9529.
APA Lin, JM,Lin, J,Xu, M,jlin@whoi.edu,&mxu@scsio.ac.cn.(2018).Microseisms Generated by Super Typhoon Megi in the Western Pacific Ocean.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,122(12),9518-9529.
MLA Lin, JM,et al."Microseisms Generated by Super Typhoon Megi in the Western Pacific Ocean".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 122.12(2018):9518-9529.
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