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利用远震深度震相pP测定玛多MS7.4地震震源深度

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对于中强地震震源深度的测定,远震转换波深度震相pP、sP测深是有效方法,在深度震相清晰时深度精度可以达到2 km.使用Teleseis程序拟合玛多MS7.4地震的理论地震图,并与实际观测进行对比,对此次地震震源深度进行测定,分析探讨地壳速度模型对远震体波深度震相pP测深的影响.结果表明,玛多地震的震源初始破深度为12 km,速度模型中VP的不确定性对理论地震图中震相到时影响更大.
DETERMINATION OF FOCAL DEPTH OF MADUO MS7.4 EARTHQUAKE BY TELESEISMIC DEPTH PHASE pP
For the determination of the focal depth of moderately strong earthquakes,the teleseismic converted wave depth phase pP and sP sounding is an effective method,and the depth accuracy can reach 2 km when the depth phase is clear.Teleseis program is used to fit the theoretical seismogram of the Maduo MS7.4 earthquake,and compared with the actual observation.The focal depth of the earthquake is measured,and the influence of the crustal velocity model on the teleseismic body wave depth phase pP sounding is analyzed and discussed.The results show that the initial rupture depth of the Maduo earthquake is 12 km,and the uncertainty of the VP in the velocity model has a greater in-fluence on the arrival time of the seismic phase in the theoretical seismogram.

Focal depthMaduo earthquakepP phase

郑雪刚、马学军、沙木哈尔·叶尔肯、赵鹏毕

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新疆维吾尔自治区地震局新源地震监测中心站,新疆新源 835800

震源深度 玛多地震 pP震相

2024

内陆地震
新疆维吾尔自治区地震局

内陆地震

影响因子:0.495
ISSN:1001-8956
年,卷(期):2024.38(4)