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首页> 外文期刊>Oceanographic Literature Review >Crustal Strength Variations Inferred From Earthquake Stress Drop at Axial Seamount Surrounding the 2015 Eruption
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Crustal Strength Variations Inferred From Earthquake Stress Drop at Axial Seamount Surrounding the 2015 Eruption

机译：2015年爆发围绕轴山山麓地震应力下降的地壳强度变化

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摘要

Variations in stress drops of earthquakes associated with the April and May 2015 eruption of Axial Seamount, on the Juan de Fuca Ridge, suggest a reduction in crustal strength as a result of the eruption. Seismicity during the inflation and deflation periods was well recorded by ocean bottom seismometers located within and along the caldera. We use these nearby recordings and an empirical Green's function spectral ratio method to obtain corner frequencies for stress drops of earthquakes on caldera ring faults. We find stress drops from 0.6 to 43 MPa for 423 ring fault earthquakes (1.6 ≤ M_W ≤ 3.6) and an average stress drop two times higher during the inflation period (6.4 MPa) prior to the eruption, than during the subsequent deflation (3.2 MPa). Stress drops also correlate with spatially varying shear wave speed, possibly reflecting a region of pervasive cracking in the northern caldera.
机译：与4月和2015年5月爆发的轴山爆发的地震压力滴的变化，提出了由于爆发而降低了地壳强度。在通胀和放气期间的地震性很好地被位于卡尔德拉内部和沿着火山口内部和沿着火山岩内的海底地震仪记录。我们使用这些附近的录音和经验绿色的功能光谱比例，以获得Caldera戒指断层的地震压力下降的角频率。我们发现423个环故障地震（1.6≤m_w≤3.6）的压力下降（1.6≤m_w≤3.6），在喷发之前，平均应力下降两倍（6.4MPa），而不是在后续放气期间（3.2MPa ）。应力下降也与空间不同的剪力波速度相关，可能反映了北卡尔达北部的普华裂缝区域。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2174-2174|共1页
  • 作者

    P.A. Moyer; M.S. Boettcher; D.R. Bohnenstiehl; R.E. Abercrombie;

  • 作者单位

    Department of Earth Sciences University of New Hampshire Durham NH United States;

    Department of Earth Sciences University of New Hampshire Durham NH United States;

    Department of Earth Sciences University of New Hampshire Durham NH United States;

    Department of Earth Sciences University of New Hampshire Durham NH United States;

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