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首页> 外文期刊>Earth, planets and space: EPS >The 2000 Western Tottori Earthquake-Seismic activity revealed by the regional seismic networks-
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The 2000 Western Tottori Earthquake-Seismic activity revealed by the regional seismic networks-

机译：区域地震台网揭示了2000年的鸟取县西部地震活动

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摘要

On October 6, 2000, the 2000 Western Tottori Earthquake (Mjma 7.3) occurred in the western Tottori prefecture area, southwestern Japan. It initiated at a depth of 12 km at the bottom of the seismogenic zone, which was derived from aftershock distribution. The aftershocks extend over a 35 km length in a north-northwest direction. Spatial and temporal distribution of the aftershocks exhibits local characteristics in the fault region. The northern part consists of earthquake clusters while the southern part consists of a rather simple lineament of aftershocks, and the spreading and decaying rate of the aftershocks is slower in the northern part. This contrast is possibly due to the heterogeneity of the fault system and probably affected the rupture process of the mainshock. Two swarm sequences occurred in the surrounding region after the mainshock. One initiated 48 hours after the mainshock 25 km southwest of the main aftershock distribution. The other started 20 hours after the mainshock northeast of the mainshock on the southeast flank of Daisen volcano. These activities are probably induced seismicity due to stress changes in the focal region. Pre-seismic swarm activities occurred in the focal region from 1989 and deep low-frequency earthquakes were observed since 1999. It is important to understand the relationship between these possible precursory phenomena and the occurrence of the mainshock.
机译：2000年10月6日，日本西南部鸟取县西部地区发生了2000年西部鸟取地震（Mjma 7.3）。它起源于余震分布，在震源区底部12 km处开始。余震在西北偏北方向上延伸了35公里。余震的时空分布在断层区域表现出局部特征。北部地区由地震群组成，而南部地区由相当简单的余震组成，北部地区余震的扩散和衰减速度较慢。这种对比可能是由于断层系统的异质性造成的，并且可能影响了主震的破裂过程。主震后在周围区域出现了两个群序。一次地震是在主余震分布西南25 km的主震后48小时启动的。另一个在大森火山东南侧面的主震东北后20小时开始。这些活动可能是由于震源区应力变化引起的地震活动。地震前震群活动始于1989年的震源区，自1999年以来发生了深低频地震。了解这些可能的前兆现象与主震发生之间的关系非常重要。

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