沂沭断裂带安丘-莒县断裂安丘—朱里段几何结构与活动特征  

GEOMETRY AND ACTIVITY OF THE ANQIU-ZHULI SEGMENT OF THE ANQIU-JUXIAN FAULT IN THE YISHU FAULT ZONE

作　　者：王志才[1] 贾荣光 孙昭民 石荣会 晁洪太 

机构地区：[1]中国地震局地质研究所,北京100029 [2]山东省地震工程研究院,济南250014

出　　处：《地震地质》2005年第2期212-220,共9页Seismology and Geology

基　　金：山东省"十五"重点项目"潍坊市活断层探测与地震危险性评价";山东省地震局科研基金(2003)联合资助。

摘　　要：安丘-莒县断裂是沂沭断裂带最主要的活动断裂,对强震的发生具有明显的控制作用。该断裂的安丘—朱里段由南流段、双官—眉村段和朱里段3条右阶斜列的次级断裂所组成,以右旋走滑活动为主,兼有正断或逆冲活动分量;其最新活动时代推断为晚更新世—全新世早期。根据断裂活动性的最新研究成果,认为在莒县至昌邑之间安丘-莒县断裂仍是占主导地位的活动断裂,与公元前70年安丘7级地震的发生具有密切关系。The Yishu Fault zone is a part of the Tanlu Fault zone that passes through Shandong Province and the northern area of Jiangsu. It is composed of 5 nearly parallel faults among which the Anqiu-Juxian Fault is the most important and prominent active fault since late Pleistocene and is usually considered to be the seismogenic fault of the 70 BC M 7 Anqiu earthquake and the 1668 AD M 8~1/_2 Tancheng earthquake. By detailed research in recent years, e.g. the active fault mapping implemented during the “Eighth Five-Year Plan” period, we have gained thorough knowledge of the middle segment of the Anqiu-Juxian Fault to the south of Juxian, while the knowledge of the segment to the north of Juxian has been poor, even no active fault profiles have ever been found. Recent discoveries about the geometry and activity of the Anqiu-Zhuli segment of the Anqiu-Juxian Fault are introduced in this paper. The segment consists of the Nanliu sub-segment, the Shuangguan-Meicun sub-segment and the Zhuli sub-segment. All these sub-segments are distributed along the linear boundary line between hilly area and plain, or locate in the eastern slope of the NNE-trending hills. These fault segments are featured with right-lateral strike-slip movement combined with dip component, and their latest activity age is late Pleistocene to early Holocene. In conclusion, The Anqiu-Juxian Fault is the predominant active structure between Juxian and Changyi in the north of Shandong, and it should have some connections with the occurrence of the 70 BC M 7 Anqiu earthquake. Since the elapsed time is nearly 2100 years, the future earthquake risk in this area shall be emphasized.

关 键 词：沂沭断裂带 莒县 活动特征 几何结构 晚更新世-全新世 活动断裂 断裂活动性 控制作用 走滑活动 活动时代 研究成果 主导地位 7级地震 强震 逆冲 

分 类 号：P315.2[天文地球—地震学] P542.3[天文地球—固体地球物理学]