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Detection of Aseismic Slip on an Inland Fault by Crustal Movement and Groundwater Observations: A Case Study on the Yamasaki Fault, Japan

机译:地壳运动和地下水观测对内陆断层的地震滑动的检测-以日本山崎断裂为例

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摘要

To understand the detailed process of fault activity, aseismic slip may play a crucial role. Aseismic slip of inland faults in Japan is not well known, except for that related to the Atotsugawa fault. To know whether aseismic slip does not occur, or is merely not detected, is an important question. The National Institute of Advanced Industrial Science and Technology constructed an observation site near Yasutomi fault, a part of the Yamasaki fault system, and has collected data on the crustal strain field, groundwater pressures, and crustal movement using GPS. In a departure from the long-term trend, a transient change of the crustal strain field lasting a few months was recorded. It indicated the possibility of an aseismic slip event. Furthermore, analyses of data from the extensometers at Yasutomi and Osawa observation vaults of Kyoto University, as well as GPS data from the Geographical Survey Institute (GEONET), revealed unsteady crustal strain changes. All data could be explained by local, left-lateral, aseismic slip of the order of 1 mm in the shallow part of the Yasutomi fault.
机译:为了了解断层活动的详细过程,抗震滑动可能起着至关重要的作用。除了与原子land川断裂有关的地震外,日本内陆断裂的地震滑动还不为人所知。知道是否发生或仅未检测到抗震滑动是一个重要的问题。国立先进工业科学技术研究院在山崎断裂系统的一部分安靖断裂附近建造了一个观测点,并利用GPS收集了有关地壳应变场,地下水压力和地壳运动的数据。与长期趋势背道而驰,记录了持续几个月的地壳应变场的瞬时变化。它表明了发生地震滑移事件的可能性。此外,对京都大学安通和大泽观测室的引伸计数据以及地理调查所(GEONET)的GPS数据的分析显示出不稳定的地壳应变变化。所有数据都可以用靖富断层浅部的1mm左右的局部,左侧抗震滑动来解释。

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  • 来源
    《Pure and Applied Geophysics》 |2006年第4期|657-673|共17页
  • 作者单位

    Tectono-Hydrology Research Group Geological Survey of Japan National Institute of Advanced Industrial Science and Technology;

    Tectono-Hydrology Research Group Geological Survey of Japan National Institute of Advanced Industrial Science and Technology;

    Tectono-Hydrology Research Group Geological Survey of Japan National Institute of Advanced Industrial Science and Technology;

    Tectono-Hydrology Research Group Geological Survey of Japan National Institute of Advanced Industrial Science and TechnologyResearch Center for Earthquake Prediction Disaster Prevention Research Institute Kyoto University;

    Research Center for Earthquake Prediction Disaster Prevention Research Institute Kyoto University;

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

    Borehole strainmeter; contractional strain; Yamasaki fault system; aseismic slip; groundwater;

    机译:钻孔应变仪;收缩应变;山崎断裂系统;地震滑动;地下水;

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