Seismic activities of Mt. Fuji region detected by continuous observation of micro-earthquakes.
Seismic activities of Mt. Fuji region detected by continuous observation of micro-earthquakes.
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通过连续观测微地震发现的富士山地区的地震活动。
DOI：
10.4294/jpe1952.32.463
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
R. Matsu’ura
中科院分区：
文献类型：
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作者：
K. Kanjo;Ikuo Karakawa;R. Matsu’ura
我们发现低频信号持续几分钟到10多分钟的长期可见光记录Okuyama（OKY）站附近的山。Fuji（图1）。这些信号的低频特征引起了振荡信号。然而，这些信号的衰减与地震信号不同，只有当在OKY观测到的信号相当大时，图2中的其他台站才能检测到相应的信号。波形作为一个整体也是相当不同的从微波的。由于这些信号在富士山一侧的地震记录中被更清楚地识别出来。富士山，这些信号的来源被认为是山附近。富士。这些信号包含P波和S波（图3），与人工激发的信号不同。S波在水平分量的迹线上被清楚地识别，而在垂直分量上不被清楚地识别。每一系列的低频信号似乎都是由许多连续发生的微地震组成的。根据每次微震的总持续时间估计的震级为一级或更小。
We found low frequency signals which lasted for a few minutes to more than 10 min on long term visible records of Okuyama (OKY) station near Mt. Fuji (Fig. 1). The low frequency feature of these signals invokes teleseismic signals. However, these signals attenuate differently from teleseismic signals, and the corresponding signals are detected at other stations in Fig. 2 only when signals observed at OKY are fairly large. Waveforms as a whole are also quite different from teleseismic ones. Since these signals were identified more clearly in the seismograms of Fuji station on the mountain side of Mt. Fuji, sources of these signals are assumed to be near Mt. Fuji. These signals contain P and S waves (Fig. 3), and are different from signals from artificial shots. S waves are identified clearly on traces of the horizontal component, while they are not identified clearly on the vertical component. It appears that each series of the low-frequency signals consists of many micro-earth-quakes which occurred in succession. The magnitudes estimated from the total duration time of each micro-earthquake are one or smaller.