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刘敬光, 黄志斌, 梁姗姗. 2019年北京海淀M2.9和怀柔M3.0地震震源参数测定[J]. 地震科学进展, 2019, (9): 2-6. DOI: 10.3969/j.issn.0253-4975.2019.09.002
引用本文: 刘敬光, 黄志斌, 梁姗姗. 2019年北京海淀M2.9和怀柔M3.0地震震源参数测定[J]. 地震科学进展, 2019, (9): 2-6. DOI: 10.3969/j.issn.0253-4975.2019.09.002
Jingguang Liu, Zhibin Huang, Shanshan Liang. Determination of the source parameters of the Haidian M2.9 andthe Huairou M3.0 earthquakes in Beijing in 2019[J]. Progress in Earthquake Sciences, 2019, (9): 2-6. DOI: 10.3969/j.issn.0253-4975.2019.09.002
Citation: Jingguang Liu, Zhibin Huang, Shanshan Liang. Determination of the source parameters of the Haidian M2.9 andthe Huairou M3.0 earthquakes in Beijing in 2019[J]. Progress in Earthquake Sciences, 2019, (9): 2-6. DOI: 10.3969/j.issn.0253-4975.2019.09.002

2019年北京海淀M2.9和怀柔M3.0地震震源参数测定

Determination of the source parameters of the Haidian M2.9 andthe Huairou M3.0 earthquakes in Beijing in 2019

  • 摘要: 本文介绍了2019年4月7日北京海淀M2.9及4月14日北京怀柔M3.0地震的基本参数速报情况,并利用区域台网波形数据,采用全波形反演方法ISOLA获得了这两次地震的最佳双力偶解。反演结果显示:M2.9地震的节面Ⅰ走向29°,倾角70°,滑动角−149°,节面Ⅱ走向288°,倾角61°,滑动角−22°;矩心深度14 km,矩震级MW=3.4。M3.0地震的节面Ⅰ走向93°,倾角84°,滑动角−30°,节面Ⅱ走向186°,倾角60°,滑动角173°;矩心深度16 km,矩震级MW=3.4。震源机制反演结果表明,两次地震均为走滑型为主的地震,其与震源区域附近历史地震震源机制解具有相同性质。

     

    Abstract: The parameters of the April 7, 2019 Haidian M2.9 and the April 14, 2019 Huairou M3.0 earthquakes in Beijing are rapidly determined by the CENC. The best double-couple solutions of the two earthquakes in Beijing are studied by the ISOLA full-waveform method using the observed waveform data from the regional seismic networks. The result of this study shows: for the M2.9 earthquake: strike=29°, dip=70° and rake=-149° for nodal plane I, and strike=288°, dip=61° and rake=-22° for nodal plane II. The centroid depth is about 14 km and the moment magnitude (MW) is 3.4; And for the M3.0 earthquake: strike=93°, dip=84° and rake=-30° for nodal plane I, and strike=186°, dip=60° and rake=173° for nodal plane II; the centroid depth is about 16 km and the moment magnitude (MW) is 3.4. The focal mechanism inversion shows that these 2 earthquakes are both strike-slip events, which are of the same type as the historical quakes in the adjacent area.

     

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