【摘要】 １９９７年９月广东省三水市发生的ＭＬ３７、４４级地震因震中烈度比同等震级的其它震例偏高许多，而且多个台站均记录到长周期振动规则的正弦形面波而特别引人注目。精确测定了这组地震的震源位置，得到震源深度约等于１ｋｍ；对比分析了震相记录特征、震区周围的历史地震活动及地质构造背景，认为这是一组罕见的低震级高烈度震例，其发生可能与震中附近的Ｆ７断层活动有关。更多还原

【Abstract】 The long-period sine-form surface waves of earthquakes with the M L3 7and 4 4 occured in Sanshui in Sep.,1997 recorded by several stations were very noticeable . After have exact detemined the earthquakes epicentral positions and focal depthes, and comparative analyzed recorded phase characteristics, the historical seismic activity and tectonic setting background of the epicenter surrounding area, we consider these are rare event whose magnitude is low and intensity is high because of the F7 fault activity nearby the epicenter.更多还原