【摘要】 强震前震源区处于不稳定状态，引潮力可能触发震源区中小地震的发生，从而导致小震调制比异常。利用阴历月历计算得到调制系数，统计了中国大陆朔望调制、上下弦调制、非调制强震的时空分布特征，在川滇交界区域、阿尔金—西昆仑区域、安徽至江苏至南黄海区域强震的调制性质具有较高的一致性。并且部分构造区域调制性质在某些时间段上也具有一定的一致性。统计1975年以来中国大陆17次7级以上地震，其中8次地震在震前3个月震中区周边出现了中小地震调制性质一致性升高的现象。这一现象具有一定短临意义。更多还原

【Abstract】 Before a strong earthquake,the focal region is in an unstable state,and the tide-generating force may trigger the occurrence of small and medium earthquakes in the focal region, thus leading to the anomaly of the modulation ratio of small earthquakes. Using the lunar calendar to calculate the modulation Coefficients, the spatial and temporal characteristics of synodic modulation,the upper and lower chord modulation,and the nonmodulated strong earthquakes are analyzed. the modulation properties of strong earthquakes in the Sichuan-Yunnan Boundary Region,the Arguin-West Kunlun region,and the Anhui-Jiangsu-South Yellow Sea region are highly consistent. And the modulation properties of some structural regions also have a certain consistency in some time periods. According to statistics,there have been 17 earthquakes with M≥7 in Chinese mainland since 1975,of which 8 earthquakes showed a consistent increase in the modulation properties of small and medium earthquakes around the epicenter three months before the earthquake. This phenomenon is of significance to the short-term and imminent prediction of strong earthquakes更多还原