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首页> 外文会议>Joint Japan-Poland Symposium on Mining and Experimental Seismology, Nov, 1999, Kyoto, Japan >Source parameters of seismic events in a copper mine in Poland based on empirical Green's functions
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Source parameters of seismic events in a copper mine in Poland based on empirical Green's functions

机译：基于格林经验函数的波兰某铜矿地震事件的震源参数

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摘要

The empirical Green's function deconvolution technique in the frequency domain is used to retrieve the source time functions from the records of P waves from seven seismic events that occurred at a copper mine in Poland in 1998. The events were located within the underground seismic network composed of 32 vertical sensors. Their moment magnitude ranged from 2.7 to 3.2. The records of smaller events from the same area and with similar source mechanism, with moment magnitude ranging from 2.2 to 2.4, were accepted as empirical Green's functions. The relative source time functions retrieved at several stations display directivity effects in five cases, implying unilateral rupture propagation. The azimuth of the rupture propagation direction and the rupture velocity were estimated from the distribution of pulse widths and pulse maximum amplitudes as a function of the cosine of station azimuths. The rupture velocity was variable, ranging from 0.33 to 0.88 of the shear wave velocity, The source dimensions, represented by the fault length, are rather small in comparison with those estimated in the frequency domain; they range from 130 to 540 m. The source pulse widths were found to be about twice smaller than the reciprocals of corner frequencies, and the rupture velocity is lower than that usually accepted in spectral models of seismic sources.
机译：经验性的格林函数反褶积技术在频域中用于从1998年波兰铜矿发生的7次地震事件的P波记录中检索源时间函数。这些事件位于由32个垂直传感器。它们的力矩幅度在2.7到3.2之间。格林经验函数被认为来自相同区域，具有相似源机制，矩量级范围从2.2到2.4的较小事件的记录。在几个站点上检索到的相对震源时间函数在五种情况下显示出方向性效应，这意味着单侧破裂传播。根据脉冲宽度和脉冲最大振幅的分布（根据站方位角的余弦函数）估算破裂传播方向的方位角和破裂速度。破裂速度是可变的，范围为剪切波速度的0.33到0.88。与断层长度相比，震源长度与频域估计的震源相比很小。它们的范围从130到540 m。发现震源脉冲宽度大约是转折频率的倒数的两倍，并且破裂速度低于地震震源频谱模型中通常接受的破裂速度。

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