| 多种方法测定2019年皎口水库地区2.5级以上地震震源深度 |
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| 作者姓名： | 彭骁 张蓓蕾 |
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| 作者单位： | 宁波地震监测预报中心，浙江宁波315000 |
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| 基金项目： | 2020年度浙江省地震局局科技项目（2020zjj12）资助。 |
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| 摘 要： | 应用CAP方法、sPL深度震相方法和双差定位方法，对2019年M2.5以上皎口水库地区地震震源深度进行测定。通过CAP方法进行反演，计算出最佳震源机制解及震源深度；在震中距50 km左右的近台识别出清晰的sPL震相，运用频率—波速（F-K）方法画出各种震源深度的理论波形，与实际波形进行拟合确定震源深度；建立地震事件对，利用走时差观测值与理论值的残差确定其相对位置及深度。结果发现，上述多种方法测定的结果基本一致；相对而言，双差定位方法更适合皎口水库地区地震震源深度的测定。
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| 关 键 词： | 震源深度 CAP sPL 双差定位 震源机制 |
| 收稿时间： | 2022-04-29 |
Focal depth determination of earthquakes with M≥2.5 in Jiaokou reservoir area in 2019 by multiple methods |
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| Institution: | Ningbo Earthquake Monitoring and Prediction Center, Zhejiang Ningbo 315000, China |
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| Abstract: | In this paper, the focal depth of earthquakes with magnitude 2.5 or above in Jiaokou reservoir area in 2019 was determined using the CAP method, the sPL depth phase method and the double difference positioning method. The inversion is carried out by CAP method to calculate the optimal focal mechanism solution and focal depth. The clear sPL seismic phase is identified at the near station about 50 km away from the epicenter, the theoretical waveform of various focal depths is drawn using the frequency wave velocity (F-K) method, and the focal depth is determined through fitting with the actual waveform. The seismic event pair is established, and its relative position and depth are determined using the residual between the observed value and the theoretical value of travel time difference. The results of various methods are basically the same. In contrast, the double difference positioning method is more suitable for focal depth determination of earthquakes in Jiaokou reservoir area. |
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