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攀西地区受印度板块挤压欧亚板块的影响,地质构造复杂,断裂发育,岩浆活动强烈,地震活动频繁,深浅源地震分布不均。为研究攀西地区地震波能量的衰减情况,陈运泰等曾用天然地震研究了该地区地壳的平均Q值,在巧家和石棉地区,Q值分别为620和560,地壳中介质的品质因数Q偏低。本文则用爆炸地震观测资料,对该区的华坪—永胜地区和会理—会东地区的Q值做了计算,并讨论了Q值分布的横向不均匀性。
The Panxi area is affected by the extrusion of the Eurasian plate in the Indian plate. The geological structure is complex, the faults are developed, the magmatic activity is intense, the seismic activity is frequent, and the deep and shallow earthquakes are unevenly distributed. In order to study the attenuation of seismic wave energy in Panxi area, Chen Yutai et al. Used natural earthquakes to study the average Q value of crust in this area. In Qiaojia and asbestos areas, the Q values were 620 and 560, respectively, and the quality factor Q in the crust low. In this paper, the Q value of Huaping-Yongsheng area and Huili-Huidong area in this area are calculated by using the observation data of the explosion earthquake. The lateral heterogeneity of Q-value distribution is also discussed.