滨北地区埕南断层晚更新世活动证据及其地震危险性意义

鹿子林; 葛孚刚; 薛俊召; 许洪泰; 倪永进; 王纪强

doi:10.11899/zzfy20220210

滨北地区埕南断层晚更新世活动证据及其地震危险性意义

doi: 10.11899/zzfy20220210

鹿子林^{1, 2,},
葛孚刚^{1, 2, ,},
薛俊召²,
许洪泰^{1, 2},
倪永进^{1, 2},
王纪强^{1, 2}

1.
山东省地震局, 济南 250014
2.
山东省地震工程研究院, 济南 250021

基金项目: 山东省防震减灾“十三五”重点项目（SD135-2-3）

详细信息

作者简介:
鹿子林，男，生于1980年。硕士，高级工程师。主要从事活断层探测、地球物理勘探方面的研究。E-mail：18866856857@163.com

通讯作者:
葛孚刚，男，生于1982年。硕士，高级工程师。主要从事地震地质、地质构造方面的研究。E-mail：408551244@qq.com

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- 文章访问数: 249
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出版历程
- 收稿日期: 2022-03-16
- 刊出日期: 2022-06-30

Evidence of Late Pleistocene Activity and Seismic Risk Significance of Chengnan Fault in Binbei Area

Lu Zilin^{1, 2
,},
Ge Fugang^{1, 2
, ,},
Xue Junzhao²,
Xu Hongtai^{1, 2},
Ni Yongjin^{1, 2},
Wang Jiqiang^{1, 2}

1.
Shandong Earthquake Agency, Jinan 250014, China
2.
Shandong Institue of Earthquake Engineering, Jinan 250021, China

摘要

摘要: 埕南断层是埕宁隆起与济阳凹陷的边界断层，也是滨北地区1条规模最大的重要断层，采用浅层地震勘探和钻孔联合剖面探测相结合的方法，确定了埕南断层准确位置，探明了断层的产状，揭露了上断点深度。钻探结果显示，埕南断层为正断特征，倾向南或南东，倾角70°～80°，断层上断点埋深44.3～46.4 m，断距1.0～1.3 m。通过年代学测试确定了错断地层的年代，获得埕南断层错断晚更新世地层的证据，埕南断层晚更新世活动证据的发现对滨北地区地震危险性再认识具有重要意义和价值。
- 埕南断层 /
- 浅层地震勘探 /
- 钻孔联合剖面探测 /
- 活动性 /
- 地震危险性
Abstract: Chengnan fault is the boundary fault between chengning uplift and Jiyang depression, and it is also an important fault with the largest scale in Binbei area. Combining with the shallow seismic exploration and composite drilling section exploration, the accurate location of Chengnan fault is determined, The occurrence of the fault is proved and the depth of the upper breakpoint is revealed. The drilling results show that Chengnan fault is characterized by normal fault, dipping South or southeast, with an inclination of about 70 °~80 °. The buried depth of the breakpoint on the fault is 44.3~46.4 m, and the vertical displacement is 0.8~1.2 m. The age of the faulted strata is determined through chronological test, and the evidence of the faulted late Pleistocene strata of Chengnan fault is obtained. The discovery of the evidence of the late Pleistocene activity of Chengnan fault is of great significance and value to the re understanding of the seismic risk in Binbei area.e seismic risk in Binbei area.
- Chengnan fault /
- Shallow seismic exploration /
- Composite drilling section exploration /
- Activity /
- Seismic risk

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图 1 研究区地震构造图

Figure 1. Seismotectonic map around the research area

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图 2 研究区地震构造图

Figure 2. Seismotectonic map of the research area

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图 3 BK2孔古地磁极性柱

Figure 3. paleomagnetic polarity column of hole BK2

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图 4 跨埕南断层浅层地震勘探时间剖面（局部）

Figure 4. Time profile of shallow seismic exploration across Chengnan fault （local）

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图 5 钻孔联合剖面（WDX）

Figure 5. Borehole joint profile（WDX）

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图 6 钻孔联合剖面（WDE）

Figure 6. Borehole joint profile（WDE）

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图 7 WD5孔（左）和WD6孔（右）55.0～60.0 m处岩芯

Figure 7. The core of 55.0～60.0 m in WD5 hole （left） and WD6 hole （right）

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图 8 WD4孔100.0～105.0 m处岩芯

Figure 8. The core of 100.0～105.0 m in WD4 hole

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图 9 WD6孔60.0m～65.0 m 处岩芯

Figure 9. The core of 60.0～65.0 m in WD6 hole

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图 10 CNWD5孔60.0～65.0 m处岩芯

Figure 10. The core of 60.0～65.0 m in CNWD5 hole

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图 11 CNWD6孔53.0～58.0 m处岩芯

Figure 11. The core of 53.0～58.0 m in CNWD6 hole

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表 1 BK2孔样品光释光年龄及参数

Table 1. Photoluminescence age and parameters of samples in hole BK2

样品编号	样品岩性	样品埋深/m	环境剂量率/Gy·ka⁻¹	等效剂量/Gy	释光年龄/ka
BK2-1	粉质黏土	3.2	2.7±0.3	11.2±0.8	4.2±0.3
BK2-2	粉土	8.0	2.7±0.3	27.4±4.8	10.0±1.8
BK2-4	粉砂	15.0	2.5±0.3	30.3±3.0	12.1±1.2
BK2-5	黏土	18.4	2.5±0.3	112.4±12.4	44.8±4.9
BK2-6	粉土	22.7	2.4±0.2	122.4±16.4	50.8±6.8
BK2-8	粉质黏土	32.0	2.4±0.2	131.4±9.8	54.8±4.1
BK2-9	粉质黏土	36.0	2.8±0.2	231.4±17.4	82.6±6.2
BK2-11	粉砂	44.0	2.4±0.2	199.1±12.6	82.9±5.3
BK2-C4	粉土	56.5	2.4±0.2	279.1±14.1	116.2±5.9
BK2-14	粉质黏土	57.0	2.5±0.3	299.1±16.5	118.2±6.6

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表 2 BK2孔第四系厚度划分

Table 2. Quaternary thickness division of hole BK2

系	统	阶	厚度/m	特征
第四系 Q	全新统Qh	/	14.4	上部为黄褐色粉土、粉质黏土互层，下部棕褐色、灰褐色粉土、粉质黏土互层。以灰褐色调与下伏的褐黄色粉砂相区别。
	更新统Q_P	萨拉乌苏阶${\rm{Q}}_{\rm{p}}^3 $	37.6	顶部为褐黄色、棕黄色粉砂、粉质黏土、粉土，含钙质结核、铁锰结核，中部为厚层黄褐色粉砂、粉土，底部为黄褐色粉质黏土。
		周口店阶${\rm{Q}}_{\rm{p}}^2 $	54.2	多个完整或不完整的黄褐色黏土-粉质黏土-粉土-粉砂-中细砂沉积韵律。底部以较深色调的黄褐色粉砂与下伏的浅色调粉质黏土相区分。
		泥河湾阶${\rm{Q}}_{\rm{p}}^1 $	137.8	薄层或中薄层的黄褐色、褐黄色粉质黏土、粉土、粉砂沉积旋回，夹厚层的黏土、粉砂层，底部剪影的褐黄色黏土，含较多铁锰氧化物，钙质结核直径可达4 cm。

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