Recent Seismic Activity in Chugoku District and its Vicinity, Western Japan as Revealed by the Telemetering Network of Shiraki Micro-Earthquake Observatory: ―白木微小地震観測所テレメータ観測網による―
Recent Seismic Activity in Chugoku District and its Vicinity, Western Japan as Revealed by the Telemetering Network of Shiraki Micro-Earthquake Observatory: ―白木微小地震観測所テレメータ観測網による―
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白木微地震观测台遥测网络显示的近期西日本中国地区及其周边地区的地震活动：―根据白木微地震观测台遥测观测台的消息―
DOI：
10.4294/zisin1948.39.2_229
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
T. Yoshii
中科院分区：
文献类型：
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作者：
S. Asano;K. Miura;Y. Inoue;R. Miura;Yukio Ishiketa;T. Yoshii
近日，日本东京大学地震研究所白木微震观测站的遥测地震台网在日本西部初谷区及其附近地区通过国家地震预报项目第四阶段建成。该网络有七个地震观测站，其中三个通过电话线连接，其中四个新安装，通过无线电与白木微震观测站相连。后四个位于该网络的南部。因此，震源确定的准确性得到了提高，特别是在南部地区。根据修正的Ichikawa-Mochizuki走时表确定的震源，得到了1983年7月至1984年10月期间地震活动的以下特征：1.在中部地区的陆地地区，地震发生在地壳上部。2.在北纬34度线以南地区，地震多发生在上地幔。震中东西向横截面清楚地显示了厚度约为20公里的简单WadatiBenioff地震带，但南北横截面显示了复杂的地震带，可能不止两个。在东西剖面上，132E以西的地震带倾角略大于132E以东的倾角。并对1983年7月至1984年10月期间的6级地震等主要事件作了详细描述。8号和M5号。2分别于1983年8月26日和1984年6月25日。
Recently the telemetering seismic network of Shiraki Micro-Earthquake Observatory, Earthquake Research Institute, University of Tokyo, has been constructed in Chugoku District and its vicinity, Western Japan by the fourth stage of National Earthquake Prediction Project. There are seven seismic observation sites in the network, three of which are linked by the telephone lines and four of which, newly installed, are linked by radio to Shiraki Micro-Earthquake Observatory. The latter four are located in the southern part of the network. Thus, the accuracy of hypocenter determination has been improved, especially in the southern part. According to hypocenter determination based on the revised Ichikawa-Mochizuki travel-time table, the following features of the seismic activity in the period from July, 1983 to October, 1984 were obtained: 1. In the land area of Chugoku District, earthquakes occurred in the upper part of the crust. 2. In the southern region of 34N latitude line, most of earthquakes took place in th upper mantle. An east-west cross section of hypocenters clearly shows a simple WadatiBenioff seismic zone with a thickness of about 20 km, but a north-south cross section of hypocenters shows complicated seismic zones, possibly more than two. The dip of the seismic zone west of 132E is a little larger than that east of 132E in the east-west cross section. Furthermore, detailed description is given to main events during the period from July, 1983 to October, 1984, such as earthquakes M6. 8 and M5. 2 on August 26, 1983 and June 25, 1984, respectively.