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采用CAP(Cut and Paste)方法反演了2015年11月23日青海祁连MS5.2主震的震源机制解,其最佳双力偶解:节面Ⅰ走向109°、倾角58°、滑动角21°,节面Ⅱ走向8°、倾角72°、滑动角146°,矩震级MW5.16,矩心震源深度约为9km。结合震区的活动构造,判定发震断层面为节面Ⅰ,推测托勒山北缘活动断裂中段为此次地震的发震断裂。
The focal mechanism solutions of the Q5.5 MS5.2 main shock of Qinghai Province were retrieved using the Cut and Paste (CAP) method on November 23, 2015. The best double-couple solution is as follows: the nodal plane Ⅰ goes to 109 °, the dip angle is 58 ° and the sliding angle 21 °, section Ⅱ to 8 °, dip 72 °, sliding angle 146 °, moment magnitude MW5.16, the depth of the centroid source is about 9km. Combined with the active tectonics of the earthquake zone, the seismogenic fault plane is determined to be the nodal plane I, suggesting that the middle part of the active fault at the northern margin of the Mt. Tuoluo is the seismogenic fault of this earthquake.