| 摘要: |
| 利用内蒙古地区测震台网记录到的地震波形数据，基于地震预警参数阈值（特征周期τc和位移幅值Pd）开展评估内蒙古地区中强地震潜在破坏区范围的研究。按照一定的筛选条件进行筛选后，拟合出适合内蒙古地区的τc与震级ML、Pd与τc和震源距R的统计关系式；根据现有地震事件的最大震级，得到仪器烈度为Ⅳ度、震级ML=5.0时对应的参数阈值为Pd=0.1075cm和τc=0.686s。最后对近年来内蒙古境内2次中强地震开展线下模拟，结果表明该方法需要台网具有一定密度，如能均匀分布，效果更好，否则会出现结果仅由经验关系式决定、而实际观测值没有发挥作用的问题。 |
| 关键词: 地震预警参数 潜在破坏区 Pd分布图 τc值 |
| DOI： |
| 分类号:P315 |
| 基金项目:中国地震局三结合课题（3JH-202002005）、北京市自然科学基金（8202051）共同资助 |
|
| Evaluation of Seismic Potential Damage Area in Inner Mongolia Based on Threshold Value of Earthquake Warning Parameters |
|
Hao Meixian1, Wang Xin1, Zhang Ke1, Liu Ying1, Yin Zhanjun1, Zhang Jianzhong1, Zheng Yu2
|
|
1.Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China;2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
|
| Abstract: |
| Based on the threshold value of earthquake warning parameters(characteristic period τc and displacement amplitude Pd),we use the seismic waveform data recorded by Inner Mongolia seismic network to study the estimation method of potential damage area of moderate strong earthquake in Inner Mongolia in this paper. According to certain screening conditions,the statistical relations between τc and ML,Pd and τc and epicentral distance R are fitted out. Then according to the maximum magnitude corresponding to the existing earthquake events,when the instrument intensity is set as IV and ML=5.0,the corresponding parameter thresholds are Pd=0.1075cm and τc=0.686s. Finally,two moderate strong earthquakes in Inner Mongolia in recent years are simulated. The results show that the relatively higher network density is required in application of this method. If the network can be evenly distributed,the effect will be better. Otherwise,the result is only determined by the empirical relationship,but the actual observations do not come into play. |
| Key words: Earthquake warning parameters Potential damage area Distribution map of Pd τc value |
