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2013年4月20日在我国四川省芦山(N30.284,E102.955)发生MS7.0地震,计算该地区潮汐变化,地震时刻引潮力处于最低相位点,显示引潮力的诱震作用属于典型逆冲断层作用类型.以此潮汐周期为时间指示(4月12日-4月23日),利用NOAA卫星地面长波辐射(OLR)数据资料分析全国范围地震前后热辐射值连续变化,结果显示:伴随潮汐演化,在全国范围(17°N-55°N-73°E-155°E)内,震前OLR仅震中及其相关联断裂附近发生了显著而连续异常变化过程:在时间上经历了起始增温→异常加强→高峰→衰减→发震→平静的演化过程;在空间上异常位置与震中基本吻合,发展过程表现出沿断裂带由分散→汇聚→分散的破裂过程,与岩石应力加载破裂演化经历:初始微动破裂→扩张破裂→应力闭锁→地震爆发→平静阶段的力学过程完全吻合,显示天体引潮力对处于临界状态的活动断层具有诱发作用,而长波辐射异常是地震构造应力应变过程辐射表征.将引潮力与OLR异常结合在地震前兆研究中有一定的实用价值.
On April 20, 2013, an MS7.0 earthquake occurred in Lushan, Sichuan Province of China (N30.284, E102.955) to calculate the tidal variation in this area. The tide force at the lowest phase point during the earthquake shows that the induced seismogenic effect is typical Thunderstorm fault type. Using the tidal period as a time indicator (April 12-April 23), the long-wave radiation (OLR) data of NOAA satellite ground surface was used to analyze the continuous change of thermal radiation before and after the earthquake. The results show that: Along with the tidal evolution, significant and continuous anomalous changes occurred in the OLR-only epicenter and its associated faults within the nationwide range (17 ° N-55 ° N-73 ° E-155 ° E): the time-experienced The initial temperature increase → abnormal increase → peak → decay → seismogenic → calm evolution process; the anomalous position in space is consistent with the epicenter basically, and the development process shows the rupture process along the fault zone from dispersion → convergence → dispersion, The evolution history of stress loading rupture is consistent with the mechanical process of initial fretting rupture → expansion rupture → stress lockout → seismic bursting → calm phase, which shows that the tidal power of celestial body has an inducing effect on the active fault in the critical state, while the longwave radiation Often seismic strain stress is configured to characterize the radiation process. The tidal force with the exception OLR incorporated earthquake precursor research has practical value.