Abstract: Several small Quaternary NE-trending depressions exist in the eastern ana soutn-ern Songliao basin due to unequal subsidence.Some of them were conspicuously active in Middle and Late Pleistocene.In or near the edge of these depressions,some moderate-strong shocks occurred in the area where the NW faults cut the NE ones.The NW faults are seismic faults generally.Furthermore,field investigations indicate that the earthquake with magnitude of 6³/4 in 1119 occurred near Kalamu.

Key words: Songliao basin, Depression, Middle and Late Pleistocene, Heterogeneous activity, Moderate-strong earthquake

摘要： 第四纪以来,松辽盆地的西部坳陷向东部和南部扩展,形成一系列北东向的次级坳陷,一些中强震便发生在其中一些坳陷的边缘或内部。这些发生中强震的场所在中晚更新世有明显的差异活动,并发育了切割北东向构造的北西向断裂,北东和北西向断裂的交汇区是中强震的发生部位。此外,野外调查结果表明,1119年前郭6³/4级地震最有可能发生在卡拉木附近。

关键词: 松辽盆地, 坳陷, 中晚更新世, 差异活动, 中强震