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首页> 外文期刊>Acta Geophysica Polonica >SOURCE TIME FUNCTION OF SEISMIC EVENTS AT POLISH COAL MINES DERIVED BY EMPIRICAL GREEN'S FUNCTION APPROACH
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SOURCE TIME FUNCTION OF SEISMIC EVENTS AT POLISH COAL MINES DERIVED BY EMPIRICAL GREEN'S FUNCTION APPROACH

机译：经验格林函数方法推导的波兰煤矿地震事件的源时间函数

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摘要

The empirical Green's function deconvolution techniques in the frequency and time domains were applied to retrieve the source time functions from the records of P waves of 25 seismic events that occurred in 1994 and 1995 at Wujek coal mine and of 5 events that occurred in 1994 at Ziemowit coal mine. The selected events were located within the underground seismic networks composed at Wujek mine of 14 vertical sensors, situated at a depth between 300 and 740 m and within the mining area of about 8 km~2. The network at Ziemowit mine was composed of 16 vertical seismometers located at a depth between 430 and 620 m in the southern part of the mine. Moment magnitude of selected events ranged from 1.1 to 2.2. The records of several smaller events from the same area and with similar source mechanism, with moment magnitude ranging from 0.3 to 1.7, were accepted as empirical Green's functions. Both applied methods, the spectral division and the projected Landweber deconvolution, provided consistent and stable results. The relative source time functions of 6 events at Wujek mine and of 3 events at Ziemowit mine indicate that the rupture in their source propagated unilaterally, either along or perpendicularly to the longwall extension where the events were originated. The rupture velocity ranged from 0.4 to 0.8 of the S-wave velocity, which is distinctly lower than its typical value reported from natural earthquakes.
机译：运用频域和时域中的格林经验解卷积技术，从1994年和1995年Wujek煤矿发生的25次地震事件和1994年Ziemowit发生的5次事件的P波记录中检索源时间函数。煤矿。选定的事件位于由14个垂直传感器组成的Wujek矿山组成的地下地震网络内，深度在300至740 m之间，并在约8 km〜2的采矿区域内。 Ziemowit矿山的网络由16台垂直地震仪组成，位于矿山南部430至620 m之间。选定事件的矩量级在1.1到2.2之间。格林经验函数被认为是来自同一区域，具有相似源机制，矩量级范围从0.3到1.7的几个较小事件的记录。频谱划分和投影的Landweber反卷积这两种应用方法均提供了一致且稳定的结果。 Wujek矿山的6个事件和Ziemowit矿山的3个事件的相对震源时间函数表明，其震源的破裂沿或垂直于事件发生的长壁延伸段单方面传播。破裂速度在S波速度的0.4到0.8范围内，明显低于自然地震报道的典型值。

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