SEISMOLOGY AND GEOLOGY ›› 2004, Vol. 26 ›› Issue (4): 638-644.

• Brief Report • Previous Articles     Next Articles

A NEWLY DISCOVERED E-W-TRENDING ACTIVE FAULT IN THE NORTHEAST PART OF SHANDONG PENINSULA

MA Bao-qi, SHU Sai-bing, LIU Guang-xun   

  1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
  • Received:2004-04-04 Revised:2004-08-03 Online:2004-12-02 Published:2009-11-27

山东半岛东北部新发现近EW向活断层

马保起, 舒赛兵, 刘光勋   

  1. 中国地震局地壳应力研究所, 北京, 100085
  • 作者简介:马保起,男,1965年生,1987年北京大学地貌学与第四纪地质学专业毕业,2000年在北京大学获得博士学位,副研究员,现主要从事地震地质学与地貌学的研究工作,电话:010-62842635,E-mail:mabq1965@yahoo.com.cn.
  • 基金资助:
    地震科学联合基金(198050)和(101096)共同资助。中国地震局地质研究所论著2004B0029。

Abstract: Late Quaternary tectonic movement in the northeast part of Shandong Peninsula was dominated mainly by integral uplift,while fault activity inside the peninsula was relatively weak. Late Pleistocene faults are limited to some local areas,and one of them is the newly discovered Dongdianhou Fault. The fault is located to the north of Taiboding Mountains,associated with a broad fracture zone of 100m wide. Outcrops of fault profile can be observed in many places along the fault strand. The fault has a general strike of nearly East-West and a total length of about 20km. Geomorphically,the fault appears as a straight fault valley consisting of 3 upper reaches of stream. The mountains on the southern side of the fault are obviously higher than those on the northern side. The cross section of the fault to the west of Xinshangzhuang Village shows that the fault displaces the unconsolidated rubble bed dated to be 84~75ka BP in age,resulting in a 1 8m high colluvial wedge,which is overlain by talus bed dated to be 64ka BP in age. The vertical slip rate of the fault is estimated roughly to be about 0.16mm/a. Soft fault gouges were observed on the fault planes exposed to the south of Diaoyushi Village and to the east of Taoyuan Village,and the age of the gouges is dated by thermoluminescent method to be 82ka BP. The characteristics of the fault and the age of overlying layers indicate that the latest faulting event occurred in early and middle stage of Late Pleistocene,while since the late stage of Late Pleistocene the fault has not ruptured the surface. According to the relation between surface rupture parameters and earthquake magnitude,it is estimated that the magnitude of the maximum potential earthquake on this fault is 6/2.

Key words: late Pleistocene, maximum potential earthquake, Shandong Peninsula, Dongdianhou Fault

摘要: 山东半岛东北部地区晚第四纪的构造活动以整体性抬升为主,内部的断裂活动相对较弱,晚更新世以来的断裂活动仅分布在局部地区,新发现的东殿后断裂是其中的1条。断裂总体走向近EW,全长约20km,地貌上表现为由3条河流上游组成的谷地。断裂错断的最新地层的热释光年龄为84~75ka BP,上覆坡积角砾层的热释光年龄为64ka BP,断裂发育的松软断层泥的热释光年龄为82ka BP。断裂的剖面特征和断盖地层的年龄表明,东殿后断裂的最新活动时代是晚更新世早中期,垂直活动速率不<0.16mm/a,晚更新世晚期以来停止活动;断裂的最大潜在地震为6/2级。

关键词: 晚更新世, 最大潜在地震, 山东半岛, 东殿后断裂

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