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首页> 外文会议>Joint Japan-Poland Symposium on Mining and Experimental Seismology, Nov, 1999, Kyoto, Japan >Observation of microearthquakes in the Atotsugawa fault region, central Honshu, Japan - Seismicity in the creeping section of the fault
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Observation of microearthquakes in the Atotsugawa fault region, central Honshu, Japan - Seismicity in the creeping section of the fault

机译：日本本州中部Atotsugawa断层地区的微地震观测-断层蠕动区的地震活动

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摘要

Seismic activity along the Atotsugawa fault system, a prominent active fault system in the northwest Chubu district, Japan, indicates a linear trend along three fault traces of the fault system. The activity is not thought to be aftershocks of the large inland earthquake of M 7.0 that occurred in 1858, because of the long time lapse since the main shock. In addition, surveys with electro-optical distance-meters have indicated creep movements from the middle to the northeastern end of the fault. In order to clarify the relationship between the seismicity and fault movements, seven temporary seismic stations were established in and around the fault zone. Focal depths obtained from the new data are 2-3 km deeper than those determined. The deeper cutoff-depth of seismicity has a concave shape along the fault system. Moreover, few events have been located from the surface to 7-8 km into the upper crust, extending to beneath the creeping section of the fault, while seismicity is high on both sides of the low seismicity area. This hypo-center distribution suggests a heterogeneous stress state or asperities along the fault system. The change in the cutoff depth of seismicity along the fault is roughly concordant with the thermal structure, but the deepest cutoff depth is 16-18 km beneath the creeping section, which is deeper than usual. This may be caused by a high strain rate. GPS surveys show that displacement pattern changes along the fault system. This suggests that the fault is basically locked. Therefore, the fault system seems to be a shear zone and supports the global stress. Thus, the heterogeneous seismicity along the fault system seems to play an important role in the nucleation of large inland earthquakes.
机译：在日本西北部中部地区一个著名的活动断层系统——Atotsugawa断层系统中，地震活动表明该断层系统的三个断层迹线呈线性趋势。该活动被认为不是1858年发生的7.0级内陆大地震的余震，因为自主震以来已经过去了很长时间。另外，用电光测距仪进行的调查表明了从断层中部到东北端的蠕变运动。为了弄清楚地震活动性与断层运动之间的关系，在断层带内及其周围建立了七个临时地震台。从新数据获得的震源深度比确定的深2-3公里。地震活动的更深的截止深度沿断层系统呈凹形。此外，从地表到上地壳到地壳7-8 km一直延伸到断层蠕变段下方的事件很少，而在低地震活动区的两侧地震活动都很高。这种偏心分布表明沿断层系统的应力状态或凹凸不均匀。沿断层地震活动的截止深度的变化大致与热力结构一致，但最深的截止深度在蠕变段以下16-18 km，比平常深。这可能是由高应变率引起的。 GPS调查显示，位移模式沿断层系统变化。这表明故障基本上已锁定。因此，断层系统似乎是一个剪切带并支持整体应力。因此，沿断裂系统的非均质地震活动似乎在大内陆地震成核中起着重要作用。

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