Abstract: A series of studies have been carried out to gain an insight into the Quaternary fault activities in Qingdao City and its surrounding area. The spatial distribution, geomorphic features and the features of the structural planes of the faults, as well as the relation between the faults and Quaternary strata have been studied in detail. Moreover, the ages of the relevant fault zone materials and unfaulted overlying Quaternary deposits have been dated by TL and/or ESR methods. This paper summarizes the achievements of these recent studies. It is concluded that the NE trending faults in Qingdao City and its surrounding area share some similarities in their dimension, orientation, age of faulted rocks, mode of motion, and age of the latest faulting. Their latest active period was in the mid late stage of middle Pleistocene. The faults have no longer been active since late Pleistocene. Moreover, in this area no fault of other strikes has been found to be active since late Pleistocene. According to historical earthquakes, the current activity of small earthquakes and Quaternary fault activities in this area, it is suggested that there's no condition for the occurrence of M_S≥6 earthquakes within this area, but it would not be surprising if an M_S≈5 earthquake should occurs in the future.

Key words: Fault activity, Quaternary, Medium earthquake, Qingdao City

摘要： 近年来,在青岛地区对第四纪断裂的空间展布、结构面和地貌特征及其与第四纪地层的关系等进行了较为详细的研究,并采用热释光(TL)及电子自旋共振(ESR)法对断层物质及断裂带上覆的第四纪堆积物的年龄进行了测定.文中对上述研究成果进行了初步总结,认为青岛及邻区内的NE向断裂在空间展布、地貌特征及最新活动时代等方面具有相似性,它们的最新活动时代为中更新世中晚期,晚更新世以来不活动.除此之外未见其它方向的晚更新世以来活动的断裂,结合历史地震及现代小震活动特点分析,认为该区域内无≥6级地震的发生条件,但有发生5级左右地震的可能性.

关键词: 断裂活动性, 第四纪, 中强地震, 青岛