上海徐汇区<i>M</i><sub>L</sub>1.9有感地震分析

上海徐汇区M_L1.9有感地震分析

基金项目: 上海佘山地球物理国家野外科学观测研究站开放基金课题《华东地区地壳上地幔三维速度结构的远震P波层析成像研究》（2020K07）资助

1.
Shanghai Earthquake Agency，Shanghai 200062，China
2.
Shanghai Sheshan National Geophysical Observatory and Research Station，Shanghai 200062，China

摘要: 2012年4月2日上海徐汇区发生M_L1.9地震，位于徐汇区、闵行区和浦东新区等地区部分房屋有晃动，部分人群有感。本文分析了上海有感地震的原因，在此基础上从地震精确定位、震源深度、地震烈度、地震发生时间以及人口密度和社会影响等对该次地震的有感原因进行了详细的分析。由于目前地震还不能准确预报，而地震的发生有很大的随机性，因此，提高民众防震减灾意识尤为重要。
- 上海徐汇 /
- 有感地震 /
- 地震定位
Abstract: The April 2nd, 2012, M_L1.9 Xuhui earthquake of Shanghai occurred. Many buildings of Xuhui, Minhang and Pudong were shaken and hundreds of thousands of people in Shanghai felt this earthquake. We analyzed the felt earthquake of Shanghai, and then the basis of this. We elaborated the reason of this felt earthquake from the following several aspects: earthquake location, earthquake depth and intensity, origin time and population density and social influence. At last, we point out that the occurrence of earthquake is random because the earthquakes can not be accurately predicted. Therefore, it is particularly important to raise the public’s awareness of earthquake preparedness and disaster reduction.
- Xuhui, Shanghai /
- felt earthquake /
- earthquake location

图 1 上海监视区地震震中分布图（1970-01-01—2012-09-30）

Figure 1. Distribution of earthquake epicentersin Shanghai monitoring area（1970-01-01—2012-09-30）

下载: 全尺寸图片幻灯片

图 2 上海台网（a）和上海台阵（b）分布图

Figure 2. Distribution map of Shanghai network（a）and array（b）

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图 3 上海地震台网的波形记录

Figure 3. Waveform record of Shanghai earthquake network

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图 4 最近台站上戏台（SHX）的波形记录

Figure 4. Waveform record of the SHX station on the nearest station

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图 5 速报结果与精确定位结果分布图

Figure 5. Distribution map of quick report results and accurate results

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图 6 地震峰值加速度分布图

Figure 6. Distribution map of peak ground acceleration

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图 7 SHX地震时频分析图

Figure 7. Earthquake time-domain analysis of the SHX station

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图 8 地震的震源机制解

Figure 8. The source mechanism solution of earthquake

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表 1 1970年以来上海周边地区有感地震列表

Table 1. The list of earthquakes felt around Shanghai since 1970

下载: 导出CSV

表 2 地震速报结果和精确定位结果的比较

Table 2. Comparison of the results of earthquake quick and accurate location

下载: 导出CSV

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