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首页> 外文期刊>Seismological research letters >2017 M-w 8.1 Tehuantepec Earthquake: Deep Slip and Rupture Directivity Enhance Ground Shaking but Weaken the
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2017 M-w 8.1 Tehuantepec Earthquake: Deep Slip and Rupture Directivity Enhance Ground Shaking but Weaken the

机译：2017 M-W 8.1 Tehuantepec地震：深度滑动和破裂方向增强地面摇动但削弱了

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摘要

The 8 September 2017 M-w 8.1 Tehuantepec normal-faulting earthquake caused unexpected widespread intensive shaking, strongly felt as far as Mexico City about 720 km northwest of the epicenter, and generated a 1.8 m tsunami at the coast. Just 11 days later, another devastating Mw 7.1 Puebla earthquake occurred near Mexico City. In this contribution, we characterized this event by a joint inversion using static Global Positioning System (GPS) offsets, Interferometric Synthetic Aperture Radar (InSAR) measurements, high-rate GPS, and teleseismic displacement waveforms, then validated the preferred model by tsunami observations. We demonstrate that the Tehuantepec earthquake rupture propagates mainly unilaterally toward the northwest at a relatively high speed (similar to 3.4 km/s), with three asperities identified: the dominant one is centered between depths from similar to 40 to 60 km while the other two are located at shallower (similar to 20 km) and deeper (similar to 90 km) depths, respectively. Moreover, we find the peak ground acceleration (PGA) recorded along the rupture propagation direction is much larger than that recorded at stations in the opposite direction with nearly identical epicentral distances (similar to 700 km). Dynamic displacements reaching 5 cm were also observed at a GPS station similar to 1450 km from the epicenter. Based on these observations and our model results, we suggest that the deep slip in the low-attenuation mantle and the rupture directivity likely enhance the nationwide ground shaking, whereas the shallow slip may contribute to the local tsunami heights. The derived slip distribution is valuable for future investigation on the explicit relationship between the M-w 8.1 Tehuantepec and M-w 7.1 Puebla events.
机译：2017年9月8日M-W 8.1 Tehuantepec常规故障地震造成意外普遍的密集震动，强烈地认为墨西哥城大约720公里的西北部震中，并在海岸生成了1.8米的Tsunami。距离墨西哥城附近发生了11天后，另一个毁灭性的MW 7.1普埃布拉地震发生。在这一贡献中，我们通过使用静态全球定位系统（GPS）偏移的联合反演，干涉式合成孔径雷达（INSAR）测量，高速率GPS和Telesismic位移波形来表征该事件，然后通过海啸观察验证了优选模型。我们证明，Tehuantepec地震破裂以相对高的速度（类似于3.4公里/秒），德国坦克地震破裂主要传播到西北部，其中鉴定了三种粗糙度：主导地位在与其他两个类似于40至60 km之间的深度之间。位于浅（类似于20公里）和更深（类似于90公里）深度的深处。此外，我们发现沿着破裂传播方向记录的峰接地加速度（PGA）远大于在相反方向上记录的电站，与几乎相同的震级距离（类似于700公里）。在GPS站点也观察到达到5厘米的动态位移，类似于距离震中1450公里。基于这些观察和模型结果，我们建议低衰减地幔中的深度滑动和破裂方向性可能会增强全国范围的地面摇动，而浅滩可能有助于当地海啸高度。衍生的滑动分配对于未来对M-W 8.1 Tehuantepec和M-W 7.1普瓦拉事件之间的显式关系的调查有价值。

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  • 来源
    《Seismological research letters》 |2018年第4期|共9页
  • 作者

    Chen Kejie; Feng Wanpeng; Liu Zhen; Song Y. Tony;

  • 作者单位

    CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA;

    Nat Resources Canada Canada Ctr Mapping &

    Earth Observ Ottawa ON K1A 0E4 Canada;

    CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA;

    CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA;

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  • 正文语种 eng
  • 中图分类 地震学;
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