湖北麻城1932年6级地震的孕震构造模式

THE TECTONIC PATTERN OF EARTHQUAKE (M=6.0) OF 1932 AT THE HUANGTUGANG,HUBEI PROVINCE

摘要:

麻城-团风断裂是一条区域性深断裂,发育于其主干断裂上盘的次生黄土岗狭长断块内部的剪性闭锁构造——鹰山尖四道河断裂,在主干断裂逆向左行错动活动中,贮存大量弹性位能,终致暴发地震。以此方式促其闭锁构造向一端发展,这是麻城黄土岗地震的基本孕震构造模式——岩石破裂型地震。

Abstract:

The earthquake (M=6.0) of April 6, 1932 took place at the Huangtu gang, Macheng, Hubei province. The Yingshanjian-Sidaohe fault is a seismic breaked structure. Because of Yingshanjian-Sidaohe fault is a locked-up structure in the Huangtugang narrow block of upper well of Macheng-Tuanfeng abyssal fault, thereby, during the Macheng-Tuanfeng fault dislocated reverse-left-laterally, much of elastic strain energy was accumulated on the shear locked up structure and at last it was caused to be break spread, there occurred the earthquake of magnitude 6.This is a strong seismic pattern of rock breaked on secondary small fault which is control led by major fault.