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我国藏北高原当雄地区,1951年11月18日发生8级地震后,于1952年8月18日又发生一次7.5级地震,它是一值得注意的强震区。本文从当雄7.5级地震的特征及地质构造背景入手,并结合对1915年桑日7级地震和当雄8级地震的研究,试图探讨当雄7.5级地震的成因。作者初步认为当雄7.5级地震的发生,是由于亚洲地块相对向南滑移,遭到印度地块向北抵抗时产生的一组近南北向的压应力,导致那曲—当雄北东向断裂重新活动的结果。
After the M 8 earthquake occurred on November 18, 1951 in our country, the area of the northern Tibet Plateau, the M 7.5 area earthquake occurred again on August 18, 1952. It is a meso-strong earthquake zone worth noting. This article starts from the characteristics and geological tectonic setting of the 7.5-magnitude earthquake in the region of Dangxiong, and attempts to explore the cause of the 7.5-magnitude Dangxiong earthquake combining with the research on the M15 and M13 earthquakes in 1915. The authors initially consider that the 7.5-magnitude earthquake in Dangxiong was caused by the relatively southward slippage of the Asian block and a set of near-north-south compressive stresses that resulted from the northward resistance of the Indian block. As a result, Naqu-Dangxiong North Eastward The result of the reactivation of the fracture.