Magnitude Simulation of Aftershocks Based on G-R Relationfor MAT Earthquake in Earthquake Emergency Response Exercise
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摘要: 在现有的日常地震演练过程中,与应急救援密切相关的地震余震信息产品较为缺乏,直接影响发震构造的判断以及影响场修正等关键环节。本文从计算机系统提供的均匀分布随机数出发,运用反函数法模拟生成余震序列,并进行系统检验,证实该方法产生的余震序列满足G-R频次关系。模拟生成的余震震级数据既有助于增强地震应急救援演练的现实性,也有助于丰富地震应急宣传产品,提升地震部门的履职能力。Abstract: Insufficient aftershock information, which is one of the key factors to emergency rescue, directly affects the essential steps such as seismogenic structure determination and influence field correction in the daily exercise against earthquake. In this paper we simulate and generate aftershock sequence by using inverse function method on uniformly distributed random numbers generated by computer system, Then we carry out system examination with the simulation results, and finally prove that the aftershock sequence generated by this method satisfies the magnitude distribution from G-R relation. The simulated aftershock sequence not only helps to enhance the reality of emergency rescue exercise against, but also contributes to enrich promotional products of earthquake emergency response and improves the executing capacity of earthquake departments.
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表 1 模拟的余震频次及拟合频次对比表
Table 1. Comparison of simulated with fitted frequency of aftershocks
震级M 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 模拟频次 48964 25291 12710 6405 3303 1615 859 428 229 105 58 33 拟合频次 48261 24662 12602 6440 3291 1682 859 439 224 115 59 30 相对误差 1.4% 2.5% 0.8% 0.5% 0.4% 4.1% 0 2.6% 2.2% 9.5% 1.7% 9.1% 表 2 不同b值的拟合效果
Table 2. The fitting results of different b value
初始b值 0.5555 0.6180 0.7123 0.8234 拟合b值 0.5560 0.6209 0.7084 0.8174 b值相对误差 0.09% 0.47% 0.55% 0.73% 相关系数 0.9999 0.9999 0.9994 0.9991 表 3 不同随机数种子的拟合效果
Table 3. The fitting results of different seeds
随机数种子 12322 350003 1234567 19491001 20080808 拟合b值 0.7214 0.7162 0.7364 0.7379 0.7278 b值相对误差 1.18% 1.89% 0.88% 1.08% 0.30% 相关系数 0.9991 0.9990 0.9994 0.9995 0.9999 -
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