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Source Study of the 24 August 2016 M-W 6.8 Chauk, Myanmar, Earthquake

机译：2016年8月24日的来源研究M-W 6.8 Chauk，Myanmar，地震

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摘要

The source process of an intraslab intermediate-depth earthquake (h = 90 km) that occurred near Chauk, central Myanmar, on 24 August 2016 was investigated using teleseismic body-wave inversion. The focal mechanism solution showed a thrust mechanism with nearly vertical or subhorizontal fault planes. The slip-inversion results for both fault planes give similar variances and show a simple slip distribution. The fault plane ambiguity was resolved by analyzing apparent source time functions for teleseismic stations affected by directivity. Based on this analysis, we prefer the subhorizontal fault plane where the rupture propagated down-dip. The T-axis showed down-dip extension while the P-axis showed slab normal compression. We obtained an effective fault length of 20 km and effective fault width of 18 km. A stress drop of 20 bars was estimated using the relation of effective fault dimension and seismic moment obtained from the slip inversion. Furthermore, we tested the stress drop, and the assumption of quality factor, which is adopted from the Mexican subduction zone, by conducting ground-motion modeling at five regional strong-motion stations. The stress drop of 20 bars can produce reasonable ground motion for these stations. One of the most prevailing hypothesis of the generating mechanism of subhorizontal faulting in intermediate depth is related to the dehydration embrittlement, which either reactivated an existing fault before it was subducted or newly created fault after, for example, due to slab unbending processes.
机译：使用Telesismic Body-Wave反演，研究了Chauk，Myanmar中Chauk，Chauk中的intraslab中间深度地震（h = 90km）的源过程。焦点机制解决方案显示了具有近似垂直或脱冰故障平面的推力机制。两个故障平面的滑移反转结果提供了类似的差异并显示出简单的滑动分布。通过分析受方向性影响的视表观站的表观源时间函数来解决故障平面模糊。基于该分析，我们更喜欢破裂传播下降的脱色故障平面。 T轴显示下降延伸，而P轴显示板坯正常压缩。我们获得了20公里的有效故障长度，有效的故障宽18公里。利用从滑移反转获得的有效故障尺寸和地震矩的关系估计了20巴的应力下降。此外，我们通过在五个区域强大运动站进行地面运动模型来测试压力下降，以及质量因子的假设，该郊区采用墨西哥俯冲区采用。 20巴的应力下降可以为这些站产生合理的地面运动。中间深度中脱色断层故障的产生机制的最普遍假设之一与脱水脆化有关，该脱水脆化有关，在例如，由于平板不平衡的过程，它在化脓后或新创建的故障之前重新激活了现有故障。

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  • 来源
    《Seismological research letters》 |2018年第5期|共13页
  • 作者

    Shiddiqi Hasbi Ash; Tun Pa Pa; Kyaw Tun Lin; Ottemoller Lars;

  • 作者单位

    Univ Bergen Dept Earth Sci Allegaten 41 N-5007 Bergen Norway;

    Minist Transport &

    Commun Dept Meteorol &

    Hydrol Off 5 Zeya Htani Rd Nay Pyi Taw Myanmar;

    Minist Transport &

    Commun Dept Meteorol &

    Hydrol Off 5 Zeya Htani Rd Nay Pyi Taw Myanmar;

    Univ Bergen Dept Earth Sci Allegaten 41 N-5007 Bergen Norway;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地震学;
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