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首页> 外文会议>Joint Japan-Poland Symposium on Mining and Experimental Seismology, Nov, 1999, Kyoto, Japan >A precise method for continuous monitoring of the temporal variation of wave propagation
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A precise method for continuous monitoring of the temporal variation of wave propagation

机译：连续监测波传播时间变化的精确方法

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摘要

On-site experiments of a new source-receiver system for seismic-monitoring are presented. The system uses precisely controlled sinusoids to achieve high signal-to-noise ratio without destroying surrounding ground. The temporal variation of travel time is monitored with the system deployed on the surface of where granite is exposed near the fault of 1995 Kobe earthquake. In this site the sources that generate sinusoidal wave with a centrifugal force of 20 ton-f are used. The source waves are received with seismometers at the bottoms of 800 m- and 1800 m-deep hole. During an experiment lasting one-month, the sources were continuously operated with a frequency modulation around 20 Hz and 30 Hz, which produced plural components of sinusoids of constant frequency interval. Both the sources and the receivers are precisely synchronized to GPS clock, resulting in high signal-to-noise ratio for the acquisition of the sinusoids Data are stacked for every one hour and 24-hour moving average is applied to the data. Each stacked data is converted into time domain to obtain the temporal variation of travel time. Cross-spectral densities are calculated for P- and S-phases in order to obtain relative variation of travel time among stacked data. The variation between the shallower and the deeper two sensors shows that the resolution of travel time is of the order of 10~(-4) over 1 km distance.
机译：提出了一种新的地震监测源接收系统的现场实验。该系统使用精确控制的正弦波来实现高信噪比，而不会破坏周围的地面。利用部署在1995年神户地震断层附近裸露花岗岩表面的系统，可以监测行进时间的时间变化。在该站点中，使用了产生20 ton-f离心力的正弦波的源。用地震仪在深800 m和深1800 m的井底接收源波。在为期一个月的实验中，光源以20 Hz和30 Hz左右的频率调制连续运行，产生了频率间隔恒定的正弦波的多个分量。信号源和接收器都精确地同步到GPS时钟，从而获得高的信噪比以采集正弦波。数据每隔一小时堆叠一次，并对数据应用24小时移动平均值。将每个堆叠的数据转换为时域，以获得行进时间的时间变化。计算P相和S相的交叉光谱密度，以获得堆叠数据之间传播时间的相对变化。较浅和较深的两个传感器之间的变化表明，行进时间的分辨率在1 km距离内约为10〜（-4）。

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