| 爆炸余震波形持时和余震事件频度模型 |
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| 引用本文： | 李学政,刘文学,沈旭峰.爆炸余震波形持时和余震事件频度模型[J].地震学报,2004,26(5):539-546. |
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| 作者姓名： | 李学政 刘文学 沈旭峰 |
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| 作者单位： | （中国西安710024西北核技术研究所） |
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| 摘 要： | 封闭爆炸发生后常常产生大量的余震事件，本文对3次爆炸余震进行了分析和研究. 结果显示，余震波形持时很短, 70％以上的余震波形持时在2～7 s之间，持时频度衰减指数约为-1.6. 幂函数模型较好地描述了余震序列频度的整体变化特征, 爆炸后约两星期内，余震序列的频度衰减较快，衰减指数约为-1.0. 早期余震以群发式为主，后期余震以单发式为主. 对于同强度的爆炸, 因介质和地质构造的差异产生的余震数量相差几倍； 对于一次里氏震级为5.5级的爆炸，爆炸后约一个月内, 余震事件频度就接近了本底，此后仍有少量的余震发生.
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| 关 键 词： | 封闭爆炸& 余震序列& 数学模型 |
| 文章编号： | 0253-3782(2004)05-0539-08 |
| 修稿时间： | 2003年3月5日 |
MODELS OF WAVE DURATION AND EVENT FREQUENCY OF EXPLOSION AFTERSHOCKS |
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| Li Xuezheng,Liu Wenxue,Shen Xufeng.MODELS OF WAVE DURATION AND EVENT FREQUENCY OF EXPLOSION AFTERSHOCKS[J].Acta Seismologica Sinica,2004,26(5):539-546. |
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| Authors: | Li Xuezheng Liu Wenxue Shen Xufeng |
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| Abstract: | The contained underground explosion (CUE) usually generates huge number of aftershocks. This kind of aftershocks induced by three CUEs were investigated in this paper. The conclusions show that the duration of aftershock waveforms are rather short, 70 percent of them range from 2 to 7 s; the occurrences of the aftershocks conform to negative power function, which has the power of -1.6. The aftershock sequence attenuates a little bit faster, with power of -1.0, within two weeks of post-explosions. During the early stage of post-explosions the aftershocks show up clusteringly, however, they usually show up individually during the late stage of post-explosions. The number of aftershocks generated by the compatible explosions differs by several times because of different me-dium and geological structure; within one month after an explosion with Richater magnitude of 5.5, the number of aftershocks attenuate to the background. Hereafter there are still tiny number of aftershocks. |
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| Keywords: | contained underground explosion aftershock sequences mathematical model |
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