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Tremor-tide correlations and near-lithostatic pore pressure on the deep San Andreas fault

机译：圣安德烈亚斯深层断层的潮汐相关性和近静态孔隙压力

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摘要

Since its initial discovery nearly a decade ago, non-volcanic tremor has provided information about a region of the Earth that was previously thought incapable of generating seismic radiation. A thorough explanation of the geologic process responsible for tremor generation has, however, yet to be determined. Owing to their location at the plate interface, temporal correlation with geodetically measured slow-slip events and dominant shear wave energy, tremor observations in southwest Japan have been interpreted as a superposition of many low-frequency earthquakes that represent slip on a fault surface. Fluids may also be fundamental to the failure process in subduction zone environments, as teleseismic and tidal modulation of tremor in Cascadia and Japan and high Poisson ratios in both source regions are indicative of pressurized pore fluids. Here we identify a robust correlation between extremely small, tidally induced shear stress parallel to the San Andreas fault and non-volcanic tremor activity near Parkfield, California. We suggest that this tremor represents shear failure on a critically stressed fault in the presence of near-lithostatic pore pressure. There are a number of similarities between tremor in subduction zone environments, such as Cascadia and Japan, and tremor on the deep San Andreas transform, suggesting that the results presented here may also be applicable in other tectonic settings.
机译：自从大约十年前首次发现以来，非火山震颤已经提供了有关地球某个区域的信息，该信息以前被认为无法产生地震辐射。但是，尚未确定引起震颤的地质过程的详尽解释。由于其在板块界面的位置，与大地测量的慢滑事件和主导的剪切波能量的时间相关性，日本西南部的地震观测被解释为代表断层表面滑动的许多低频地震的叠加。流体也可能是俯冲带环境下破坏过程的基础，因为卡斯卡迪亚和日本的震颤的地震和潮汐调制以及两个震源区的高泊松比都表明孔隙流体受压。在这里，我们确定了与圣安德烈亚斯断层平行的极小潮汐剪切应力与加利福尼亚帕克菲尔德附近的非火山震颤活动之间的强相关性。我们建议，该震颤代表在接近恒压孔隙压力存在的临界应力断层上的剪切破坏。在俯冲带环境（如卡斯卡迪亚和日本）中的震颤与深圣安德列斯变换的震颤之间存在许多相似之处，这表明此处介绍的结果也可能适用于其他构造环境。

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  • 来源
    《Nature》 |2009年第7276期|1048-1051|共4页
  • 作者

    Amanda M. Thomas; Robert M. Nadeau; Roland Buergmann;

  • 作者单位

    Department of Earth and Planetary Science, Berkeley Seismological Laboratory, University of California-Berkeley, 307 McCone Hall, Berkeley, California 94720-4767, USA;

    Department of Earth and Planetary Science, Berkeley Seismological Laboratory, University of California-Berkeley, 307 McCone Hall, Berkeley, California 94720-4767, USA;

    Department of Earth and Planetary Science, Berkeley Seismological Laboratory, University of California-Berkeley, 307 McCone Hall, Berkeley, California 94720-4767, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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