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利用中国地震局地壳应力研究所于2010~2011年在滇西南地区布设的宽频带流动地震台所记录的三分量高质量波形资料,采用小生境遗传算法通过波形反演,获得了研究区P波速度模型.结果显示,滇西南地区地壳厚度为38~43 km,上地幔顶部平均速度为7.9 km/s,地壳速度存在明显的横向不均匀性.思茅地块的上地壳和下地壳厚度均呈现出明显的由南向北、自东向西增厚趋势,说明该地块地壳增厚由上地壳和下地壳共同增厚形成.腾冲地块中地壳和下地壳的平均厚度及速度均小于保山地块和思茅地块,思茅地块部分路径上的下地壳和上地幔速度均较低,可能与印度板块东向俯冲引起地幔热物质上涌等动力过程密切相关.这些结果对于认识青藏高原形成与演化动力过程提供重要地震学约束.
Using the three-component high-quality waveform data recorded by the broadband mobile stations deployed in the southwestern Yunnan region from 2010 to 2011 by the Institute of Crustal Dynamics, China Earthquake Administration, the P-wave velocity Model.The results show that the crustal thickness is 38-43 km in the southwestern Yunnan region and the average velocity at the top of the upper mantle is 7.9 km / s, with obvious lateral heterogeneity in the crustal velocity.The thickness of the upper crust and the lower crust in the Simao block show a The obvious thickening trend from south to north and from east to west indicates that the crustal thickening of the block is formed by the thickening of the upper crust and the lower crust.The average thickness and velocity of the crust and the lower crust in the Tengchong block are less than that of Baoshan The velocities of the lower crust and the upper mantle on the part of Simao block and the Simao block are all low, which may be closely related to the dynamic processes such as upwelling of mantle plume caused by the subduction of the Indian plate. These results are of great significance for the understanding of the formation of the Tibetan Plateau Evolutionary dynamics provide important seismological constraints.