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| 近场震级起算函数确定与爆炸余震震级计算 | |
| 引用本文： | 李学政,王海军,雷军.近场震级起算函数确定与爆炸余震震级计算[J].中国地震,2003,19(2):117-124. |
| 作者姓名： | 李学政 王海军 雷军 |
| 作者单位： | 1. 西北核技术研究所,西安,710024 2. 西安交通大学,西安,710049 3. 北京大学,北京,100085 |
| 摘 要： | 在天然地震背景下，由于现有的起算函数在0—5km范围内是一个常数，因此，对于震源深度较浅的小地震震级的测定遇到了困难，本文通过理论计算和爆炸地震波实际测量两种方法，确定了近场0—5k瑚范围内的震级起算函数。用本文确定的震级起算函数计算了两次爆炸余震序列事件的震级，绝大多数的余震震级非常小，主要分布在-0．5—1．0级之间，余震序列的M-t图与一般强余震M-t图明显不同，它不仅存在反映较大震级的正向柱状线，而且还存在反映较小震级的负向短柱状线。 |
| 关 键 词： | 起算函数 爆炸余震 震级计算 露级分布 地震波能量 |
| 文章编号： | 1001-4683(2003)02-0117-08 |
The Calculation of Calibration Function and Explosive Aftershocks at the Near Field |
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| Li Xuezheng,Wang Haijun,Lei Jun.The Calculation of Calibration Function and Explosive Aftershocks at the Near Field[J].Earthquake Research in China,2003,19(2):117-124. | |
| Authors: | Li Xuezheng Wang Haijun Lei Jun |
| Institution: | Li Xuezheng 1) Wang Haijun 2) Lei Jun 3) 1) |
| Abstract: | The calibration function is used for calculating magnitude at the near field that is the constant,therefore,magnitude calculation of small earthquakes encounters vital difficulties.According to the attenuation law of explosions and the propagating theory of elastic waves,the calibration function from 0km to 5km have been obtained.Magnitudes of two aftershock sequences are calculated.Explosive earthquakes have rather small magnitudes.Magnitudes of 90% aftershocks range from -0 5 to 1 0.The M t drawing of explosive aftershocks completely different from that of strong aftershocks.It not only shows lines with positive bar but also short lines negative bar. |
| Keywords: | Explosion aftershocks Calibration function Magnitude distribution |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |