| 利用超导重力数据约束2015-09-16智利Illapel MW8.3地震震源参数 |
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| 引用本文： | 江 颖,刘子维,张晓彤.利用超导重力数据约束2015-09-16智利Illapel MW8.3地震震源参数[J].大地测量与地球动力学,2020,40(12):1223-1227. |
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| 作者姓名： | 江 颖 刘子维 张晓彤 |
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| 摘 要： | 根据2015-09-16智利Illapel地震现有的14个不同震源机制解模拟计算其激发的自由振荡信号，并与拉萨站和武汉站超导重力观测结果进行比对。基于1.5~5.3 mHz的球型简正模分析和约束Illapel地震的震源机制解，并参考最佳震源机制解，将观测值与模拟值进行对比，搜索更为准确的标量地震矩和断层倾角。计算得出，该地震标量地震矩为(3.0±0.2)×1021 Nm，相应矩震级为MW8.3，最优断层倾角为19°。研究结果表明，利用超导重力观测可对Illapel地震的震源机制解进行总体评估，基于长周期地震波信号或联合多种观测资料可反演得到可靠震级。
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| 关 键 词： | Illapel地震 震源机制解 地球自由振荡 超导重力观测 |
Source Parameters of the 2015-09-16 MW8.3 Illapel,Chile Earthquake Determined by Superconducting Gravimeter Observations |
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| JIANG Ying,LIU Ziwei,ZHANG Xiaotong.Source Parameters of the 2015-09-16 MW8.3 Illapel,Chile Earthquake Determined by Superconducting Gravimeter Observations[J].Journal of Geodesy and Geodynamics,2020,40(12):1223-1227. |
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| Authors: | JIANG Ying LIU Ziwei ZHANG Xiaotong |
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| Abstract: | We compare observation data of Wuhan and Lhasa superconducting gravimeters with free oscillations simulated by 14 different focal mechanisms of the 2015-09-16 Illapel earthquake. The focal mechanism solutions of the Illapel earthquake are analyzed and constrained by spherical normal modes in 1.5-5.3 mHz frequency band. We compare observed value with simulated value to search the more accurate scalar seismic moment and fault dip angle based on the optimal focal mechanism solutions. The results show that the scalar seismic moment of the 2015 Illapel earthquake is (3.0±0.2)×1021 Nm, corresponding to MW8.3, and the optimal dip angle is 19°. This shows that the focal mechanism solution of Illapel earthquake can be evaluated based on superconducting gravity observation, and the reliable magnitude can be obtained by inversion based on long-period seismic wave signals or multiple observation data. |
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| Keywords: | Illapel earthquake focal mechanism solutions Earth’s free oscillations superconducting gravity observation |
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