SEISMOLOGY AND GEOLOGY ›› 2022, Vol. 44 ›› Issue (5): 1156-1171.DOI: 10.3969/j.issn.0253-4967.2022.05.005

• Research paper • Previous Articles     Next Articles

QUATERNARY TECTONIC FEATURES OF THE FUMAYING HIDDEN AREA OF THE ANQIU-JUXIAN FAULT

WANG Lei1),2),3)(), XU Hong-tai1),3)(), WANG Zhi-cai1), YANG Chuan-cheng1),3), ZHANG Jian-min1),3), WANG Dong-lei1),3), XIA Nuan1),3), CAI Ming-gang2), LU Ren-qi2), REN Zhi-kun2)   

  1. 1) Shandong Earthquake Agency, Jinan 250014, China
    2) Institute of Geology, China Earthquake Administration, Beijing 100029, China
    3) Earthquake Risk Prevention and Control Center of Shandong Province, Jinan 250021, China
  • Received:2021-07-20 Revised:2021-10-11 Online:2022-10-20 Published:2022-11-28
  • Contact: XU Hong-tai

安丘-莒县断裂驸马营覆盖区第四纪活动特征

王雷1),2),3)(), 许洪泰1),3),*(), 王志才1), 杨传成1),3), 张建民1),3), 王冬雷1),3), 夏暖1),3), 蔡明刚2), 鲁人齐2), 任治坤2)   

  1. 1)山东省地震局, 济南 250014
    2)中国地震局地质研究所, 北京 100029
    3)山东省震灾风险防治中心, 济南 250021
  • 通讯作者: 许洪泰
  • 作者简介:

    王雷, 男, 1988年生, 2016年于防灾科技学院获地质工程专业硕士学位, 工程师, 主要从事地震地质方向和纳米构造方向的研究, E-mail:

  • 基金资助:
    山东省地震局一般科研项目(YB2106); 国家自然科学基金(41574066); 中国地震局地质研究所基本科研业务专项(IGCEA1602); 安丘-莒县活动断层(潍坊段)综合探测与地震灾害风险评估项目共同资助

Abstract:

The Anqiu-Juxian Fault is an important seismogenic fault in the eastern China, along which many strong earthquakes occurred in history. From north to south, the fault can be divided into Anqiu section, Juxian-Tancheng section and Xinyi-Sihong section. According to the spatial distribution, occurrence and activity characteristics of the fault, the Anqiu section also can be divided into five sub-sections, which are the north of Changyi sub-section, the Changyi-Nanliu sub-section, the Anqiu-Mengtuan sub-section, the Qingfengling sub-section and the Mengyan sub-section. Since the late Quaternary, the activity of the Anqiu-Juxian Fault can be divided into two branches, namely, the west branch F5-1 and the east branch F5-2. There is a hidden area of the fault around Fumaying village, Weifang, Shandong Province. In order to find out the fault features of the hidden area on the Anqiu-Changyi segment of the fault, the geological-geomorphological investigation, shallow artificial seismic prospecting, combined drilling, trenching and OSL dating were carried out. Through the above work, we obtained the following understandings: 1)The results of geological and geomorphological survey and shallow seismic profiles show that the Meicun-Shuangguan segment of Anqiu-Juxian Fault can also be divided into F5-1 and F5-2. The branch F5-2 of the fault is hidden in the Quaternary layers, and the west branch F5-1 exposes at the east slope of the hills. The area between the two branches of the fault is the Fumaying hidden area in this paper. 2)The combined drilling section in the Fumaying hidden area shows that the east branch F5-2 passes through between the drillings Z4 and Z5, and the upper breakpoint can be inferred to extend to the interior of the layer w2 of Heituhu formation of Holocene series, buried at the depth of 4.2~6.9m. The shell was sampled as 14C dating sample at the bottom of Heituhu formation, and the result from the sample No. 14C-1 is(9.79±0.03)kaBP, indicating that the latest active age of the east branch is the Holocene. 3)Between the two branches, a long strip-shaped Quaternary basin is formed along the east branch fault. The Quaternary at the west side of the fault developed well, and the layers of lower Pleistocene, middle Pleistocene, upper Pleistocene and Holocene can be seen in the drilling cores; Only the upper Pleistocene and Holocene deposited at the east side. This phenomenon indicates that the Fumaying Basin deposited in the early-middle Quaternary and has the characteristics of the faulted basin. 4)There are different activities in different periods between the two branches of the Anqiu-Juxian Fault. The Fumaying hidden segment of the east branch F5-2 was active obviously in the early-middle Quaternary, and still active since the late Quaternary. According to the geological and geomorphological survey, there is a set of the late Pleistocene yellow silt strata offset by the west branch F5-1, indicating that the latest active age of the west branch is the late Pleistocene.

Key words: Anqiu-Juxian Fault, Fumaying village, hidden area, fault features

摘要:

安丘-莒县断裂是中国东部重要的发震断裂, 历史上发生过多次强震。为厘清该断裂安丘-昌邑段驸马营覆盖区的断裂特征, 开展了地质地貌调查、 浅层人工地震勘探、 钻孔联合剖面探测和探槽开挖工作。文中获得了以下几点认识: 1)地质地貌调查和浅震勘探结果表明, 安丘-莒县断裂眉村-双官段可分为2支, 分别为断裂西支F5-1 和东支F5-2, 西支断裂F5-1 在丘陵东坡出露, 东支断裂F5-2 隐伏于第四系中。2)驸马营覆盖区的钻孔探测结果表明, 断裂东支F5-2 在钻孔Z4和Z5之间通过, 上断点可推测延伸至层w2全新统黑土湖组内部, 埋深为4.2~6.9m, 在黑土湖组底部取14C贝壳样品14C-1, 其结果为(9.79±0.03)kaBP, 表明东支断裂曾于全新世活动。3)在2支断裂之间沿东支断裂形成了长条形的第四纪盆地, 东支F5-2 断裂西侧第四系发育较完整, 岩心见下更新统、 中更新统、 上更新统和全新统; 东侧仅沉积了上更新统和全新统, 表明驸马营盆地在第四纪早期和中期一直接受沉积, 具有断陷盆地的特点。4)安丘-莒县断裂的东支和西支在不同时期的活动强度存在差异, 断裂东支F5-2 的驸马营隐伏段在第四纪早-中期活动强烈, 晚第四纪以来仍有活动。经地质地貌调查发现, 断裂西支F5-1 错断地质剖面晚更新世黄色粉土, 断裂的最新活动时代为晚更新世。

关键词: 安丘-莒县断裂, 驸马营, 覆盖区, 断裂特征