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首页> 外文期刊>Journal of Asian earth sciences >Tomographic signatures and origin of the 2016 Meinung earthquake (Mw 6.7), Kaohsiung, SW Taiwan
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Tomographic signatures and origin of the 2016 Meinung earthquake (Mw 6.7), Kaohsiung, SW Taiwan

机译：2016年Meinung地震（MW 6.7），高雄，SW台湾的断层象征及起源

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摘要

In order to investigate the plausible generation mechanism of the 2016 Mw 6.7 Meinung earthquake, a large number of high-quality travel times of P- and S-wave source-receiver pairs are inverted to assimilate high resolution three-dimensional (3-D) seismic velocity (Vp, Vs) and Poisson's ratio () structures in this study. Our seismic imaging revealed that the 2016 Meinung earthquake occurred along a distinctive edge portion exhibiting high-to-low variations in these parameters in both horizontal and vertical directions across the hypocenter. A continuous low-velocity zone with high- is found to be intriguingly associated with the Laonung and Chisan faults where the western upper crust beneath the central coastal plain, western foothills, and southeastern lower crust under the central range are clearly imaged. We propose that weakening of the southeastern crust is attributed to the intrusion of fluids either from the young fold cum thrust fault belt in the shallow crust, or from the dehydration of the subducted Eurasian continental (EC) plate in the lower crust to the upper mantle. The earthquake genesis beneath SW Taiwan is associated with two predominant processes: (i) fluid intrusion into the upper Oligocene to the Pleistocene shallow marine and clastic, shelf units of the Eurasian continental crust; (ii) fluid intrusion into the relatively thin uppermost part of the transitional Pleistocene-Holocene foreland formed along the deformational front due to the subduction of the EC plate. Our estimated models demonstrate that the reduction of anomalous signatures of crustal attributes (Vp, Vs, ) due to intrusion of fluids might have lowered the seismogenic strength of the source zone and contributed to the genesis of the 2016 Meinung mainshock.
机译：为了研究2016 MW 6.7 Meinung地震的合理发电机制，倒置了大量的P-S波源 - 接收器对的高质量旅行时间，以同化高分辨率三维（3-D）地震速度（VP，VS）和本研究中的泊松比（）结构。我们的地震成像显示，2016 Meinung地震沿着展示在俯冲边静脉的水平和垂直方向上的这些参数的高低变化。发现具有高的连续低速区，令人兴趣地与劳伦和智斯兰断层相关联，其中西部沿海平原，西部山麓和东南下地壳下方的西部地壳明显成像。我们建议削弱东南地壳归因于浅地壳中的少数褶皱暨推力断路器的侵扰，或者从下面地壳中覆盖的欧亚大陆（EC）板上的脱水，到上部地幔。 SW台湾下面的地震创世纪与两种主要方法有关：（i）欧亚大陆地壳的普利科茂浅海洋和碎屑单位进入上部寡茂的流体侵入性; （ii）由于EC板的俯径，沿着变形前沿形成的过渡性全茂 - 全新世的相对薄的最上部的流体侵入。我们的估计模型表明，由于流体的侵扰而导致的地壳属性（VP，VS，）的异常签名可能降低了源区的发震强度，并有助于2016 Meinung MainShock的成因。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第3期|104651.1-104651.10|共10页
  • 作者

    Wang Z.;

  • 作者单位

    Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458 China|Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of Sciences Guangzhou 510301 China;

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  • 正文语种 eng
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  • 关键词

    2016 M6.5 Meinung earthquake; Edge portion of seismic images; Fluid intrusion; Joint seismic tomography;

    机译：2016 M6.5 Meinung地震;地震图像的边缘部分;流体侵入;联合地震层析成像;

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