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利用中美合作Hi-Climb项目北段吉隆-鲁谷剖面的天然地震探测数据,拾取2004~2005年期间5级以上地震事件的P波与4级以上地震的Pn波震相的走时,通过多震相层析成像反演获得青藏高原腹地的地下500 km以上的P波速度扰动结构.结果表明雅江地区为北向倾斜的低速扰动,班公-怒江断裂下方存在向南俯冲并被印度板块俯冲挤压而回折的高速体,建立了印度板块在冈底斯地块下方拆沉并被雅江低速体穿越的构造样式.说明印度板块俯冲在到达班公-怒江缝合带之前已经开始消减,与拆沉位置对比发现,印度板块的前锋深部呈现多期多级次特征,并受到地幔热循环作用的影响.
Based on the natural seismic exploration data of the Geilong-Lugu section of the Hi-Climb Sino-US cooperation northern section, the travel times of the Pn wave phases of P-wave and M≥4 earthquakes with magnitude 5 or above earthquakes between 2004 and 2005 are picked up, P-wave velocity perturbations above 500 km above the ground in the hinterland of the Qinghai-Tibet Plateau were retrieved by seismic tomography. The results show that the Yajiang area is a north-trending low-velocity disturbance with subducting southward beneath the Bangong-Nujiang fault and being subducted by the Indian plate Pressure and fold back the body of high-speed, the establishment of the Indian plate in the Gangdise massif and the Yajiang low-velocity body demolition of the structural style shows that the subduction of the Indian plate to reach the Ban Gong - Nujiang suture zone has begun to reduce before, and demolition The position comparison shows that the Indian Plate’s fore-part shows deep multi-stage multi-level features and is affected by the thermal cycle of the mantle.