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Intraslab Mexican earthquakes of 27 April 2009 (Mw5.8) and 22 May 2009 (Mw5.6): a source and ground motion study

机译:2009年4月27日(Mw5.8)和2009年5月22日(Mw5.6)的墨西哥Intraslab地震:震源和地震动研究

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摘要

Two types of intraslab earthquakes in the subducted Cocos plate occur below Guerrero. Mexico, and adjacent areas: (A) steeply-dipping thrust earthquakes, and (B) normal-faulting earthquakes. Type A events are located ~10-35 km from the coast at a depth of ~35 km and reveal down-dip compression in the slab, most probably a consequence of unbending of the slab. Type B earthquakes are only slightly deeper than type A events when they occur near the coast, but if they occur farther inland where the slab becomes horizontal, they reach a depth of 40-50 km. They reveal down-dip extension in the subducted slab.rnAnalysis of earthquakes of 27 April 2009 and 22 May 2009 reveals that they were intraslab events in the subducted Cocos plate of type A and B, respectively. The source spectra retrieved from local and regional data yield Brune stress drop, Δσ, of ~49 and 34 MPa, respectively, somewhat greater than the median Δσ of 30 MPa previously reported for intraslab Mexican earthquakes. Our estimates of the radiated energy, E_R are 3.55×10~(13) J and 2.29×10~(13) J, which gives E_R/M_0 of 5.63×10~5 and 6.54×10~5 and apparent stress, σ_a of 3.9 MPa and 4.6 MPa, respectively (corresponding to M_0 reported in Global CMT catalog), reasonable values for intraslab earthquakes.rnPeak ground accelerations (PGA) as a function of distance are in fairly good agreement with previously-derived attenuation relations for Mexican intraslab earthquakes. Ground motions in the Valley of Mexico from intraslab earthquakes are enriched at high frequency as compared to those from interplate events, especially in the hill zone. This reflects both a more energetic nature of the intraslab sources and, relatively, closer location of many of these earthquakes. The results obtained in this study give us some confidence in our knowledge of the nature of intraslab sources and our ability to estimate ground motions from future events.
机译:俯冲的Cocos板中的两种平板内地震发生在Guerrero下面。墨西哥及附近地区:(A)陡倾冲地震,和(B)正常断层地震。 A类事件位于距海岸约10-35 km处,深度约〜35 km,并显示出板块的下倾压缩,这很可能是板块未弯曲的结果。当B型地震在海岸附近发生时,其深度仅比A型地震略深一些,但是如果发生在更深的内陆地区(平板变为水平位置),则地震深度将达到40-50 km。他们揭示了俯冲板块的下倾延伸。2009年4月27日和2009年5月22日的地震分析表明,它们分别是A和B型俯冲板块的板内事件。从本地和区域数据中获得的震源谱分别产生约49和34 MPa的Brune应力降Δσ,比先前报道的墨西哥板内地震的中值Δσ稍大。我们估计的辐射能E_R为3.55×10〜(13)J和2.29×10〜(13)J,得出E_R / M_0为5.63×10〜5和6.54×10〜5,视应力为σ_a分别为3.9 MPa和4.6 MPa(对应于Global CMT目录中报告的M_0),板坯内地震的合理值。rn峰值地面加速度(PGA)作为距离的函数与先前推导的墨西哥板内地震的衰减关系非常吻合。与板间事件相比,平板内地震在墨西哥谷地带的地震动具有较高的频率,特别是在山地带。这既反映了板内震源的更高能量性质,又反映了其中许多地震的相对较近位置。这项研究中获得的结果使我们对板坯内源的性质以及从未来事件中估计地震动的能力有了一定的信心。

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  • 来源
    《Geofisica internacional》 |2010年第3期|P.153-163|共11页
  • 作者单位

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Geofisiea, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacan, 04510, Mexico City, Mexico;

    rnInstituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

    Instituto de Ingenieria, Universidad National Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacdn, 04510, Mexico City, Mexico;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    intraplate earthquakes; slab geometry; radiated energy; ground motion;

    机译:板内地震;平板几何;辐射能地面运动;

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