振幅衰减特性在地震与爆破识别中的应用
Amplitude attenuation and its application to earthquake and explosion discrimination
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摘要: 基于小震级地震与爆破事件，从快速识别要求出发，分析了P波初动振幅AI和P波最大振幅AP分别与S波最大振幅AS的幅值比判据及其对事件的识别能力．考虑到传播路径对地震与爆破各振幅的影响，选用合理的振幅随距离衰减公式，分别研究了P波、 S波各振幅随震中距的衰减特征，结果显示爆破振幅衰减比地震快； 在100 km处进行衰减校正后重新计算P波与S波幅值比，得到经过衰减校正后的幅值比AI/AS正确识别率从84%提高到98%，AP/AS正确识别率从92%提高到100%，表明经衰减校正后的幅值比判据可以更好地应用于小震级地震与爆破的识别中．Abstract: Based on the small magnitude earthquakes and explosions and quick identification requirements, this paper analyzed the identification ability of first motion amplitude AI and P maximum amplitude AP to S maximum amplitude AS ratios. Considering the impact of propagation paths on different seismic amplitude, this paper selected reasonable amplitude attenuation formula with distance, and invesigated attenuation characteristics of P, S amplitudes which indicates that amplitude of explosion attenuated faster than that of earthquake. We chosen 100 km as attenuation correction distance and recalculated the ratios of P amplitude to S amplitude after attenuation correction, then it is shown that the correct recognition rate of AI/AS improved from 84% to 98%, AP/AS improved from 92% to 100%. These results show that amplitude ratio criteria after attenuation correction could be better applied to small magnitude earthquakes and explosions recognition.
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期刊类型引用(4)
1. 贾晓辉，曹秀玲，王晓山. 考虑地形效应的随机有限断层法地震动模拟研究. 地震研究. 2024(04): 619-626 . 
百度学术
2. 党鹏飞，刘启方，马完君，王冲. 参数对地震动随机模拟结果的影响分析. 防灾减灾工程学报. 2022(04): 768-777+818 . 百度学术
3. 梁俊伟，钟菊芳，吴海波，陈功. 基于能量的随机有限断层法研究. 南昌航空大学学报(自然科学版). 2015(02): 10-15+69 . 百度学术
4. 高阳，潘华，汪素云. 中强地震随机有限断层模型应力降参数的确定方法. 震灾防御技术. 2014(04): 733-747 . 百度学术
其他类型引用(14)
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