【摘要】 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.更多还原

【Abstract】 The cycle process of the tidal force of celestial body for Lushan M7.0 earthquake occurred in Lushan county of Sichuan,China on April 20,2013 was calculated. The earthquake occurred at the lowest point phase.It indicated that the type of seismogenic fault that the tide force acted on belonged to the thrust fault.According to the tidal cycle,the abnormal OLR(Outgoing Long-wave Radiation)change was analyzed based on NOAA satellite data around the whole China before and after the earthquake.The result showed that the OLR have changed evidently with the tide force changing.In temporal,the change went through:initial OLR rise→strength→reaching abnormal peak→attenuation→return to normal;In spatial,the abnormal area winded its way along the Longmenshan fault and went through:scattered→conversion→scattered procession.The procession was similar to the change procession of rock breaking under the stress loading.It indicated that the tidal force of celestial body could trigger the earthquake to occur when the tectonic stress reaches its critical broken point and the OLR anomaly was correspondence to the seismic tectonic stress change.It was useful to combine OLR and tidal force in earthquake precursory.更多还原