Multiscale seismic imaging of the eastern Nankai trough by full waveform inversion
Multiscale seismic imaging of the eastern Nankai trough by full waveform inversion
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DOI：
10.1029/2004gl020453
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发表时间：
2004-09
影响因子：
5.2
通讯作者：
J. Dessa;S. Operto;S. Kodaira;A. Nakanishi;G. Pascal;J. Virieux;Y. Kaneda
中科院分区：
文献类型：
--
作者：
J. Dessa;S. Operto;S. Kodaira;A. Nakanishi;G. Pascal;J. Virieux;Y. Kaneda
经典的主动地震方法无法清晰地对地球深部地壳成像。我们首次基于密集的海底地震数据进行二维全波形反演，并将其应用于地壳尺度，以研究日本南海东部俯冲系统。这种方法能够以前所未有的分辨率对地震波速进行量化。结果揭示了俯冲洋壳和阻挡体内部的挤压构造特征。在深部，沿主要断层和构造不连续面的速度异常为流体和弱化物质的存在以及可能的同震滑动分解结构提供了证据。
Classical active seismic methods fail to sharply image the earth's deep crust. We present the first crustal‐scale application of 2‐D full waveform inversion based on dense ocean bottom seismic data to investigate the Eastern Nankai subduction system (Japan). This approach allows to quantify seismic velocities up to an unprecedented degree of resolution. Results reveal compressive tectonic features within both the subducting oceanic crust and the backstop. At depth, velocity anomalies along major faults and structural discontinuities bring evidence for the presence of fluids and weakened material and also for a possible co‐seismic slip partitioning structure.