计算河北唐山M_S5.1地震过程中潮汐变化，基于该潮汐周期指示背景时间，分析本次地震过程中射出长波辐射（OLR）和遥感大气温度（AT）同步变化。结果显示，2020年7月5日~2020年7月13日，伴随引潮力由低谷向高峰连续增强变化，地震发生在引潮力相对高值时刻；伴随引潮力变化，长波辐射、大气温度经历震前平静-增强-高峰、震后快速衰减的同步变化。表明引潮力在本次地震中改变了构造内部地应力累积-失衡过程，具有触诱发地震的作用，而地面长波辐射、地表大气温度准同步变化，间接反映了本次地震地应力的变化过程。

Based on the tide period indicating background time,the synchronous changes of outgoing long-wave radiation(OLR)and remote sensing atmospheric temperature(AT)during the Tangshan M5.1 earthquake in Hebei Province are analyzed. The results showed that the earthquake occurred at the time when the tidal force was relatively high and from July 5,2020 to July 13,2020,with the continuous increase of tidal force from the trough to the peak,the OLR and the AT experienced the synchronous changes of quiet-enhancement-peak before the earthquake and rapid attenuation after the earthquake. Our results suggested that the tidal force has changed the accumulation unbalance process of in-situ stress in the structure and has the effect of triggering earthquake. The quasi synchronous changes of OLR and AT indirectly reflected the change process of in-situ stress of the earthquake.

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国家重点研发计划资助（2018YFC1503505）、中国地震局基本科研业务专项（ZDJ2018-18）和亚太地震二期项目“地震前兆特征的星地一体化观测研究”共同资助