LATE QUATERNARY ACTIVITY FEATURES OF THE NANLIU SEGMENT OF THE ANQIU-JUXIAN FAULT IN THE TANLU FAULT ZONE

doi:10.3969/j.issn.0253-4967.20240164

SEISMOLOGY AND GEOLOGY ›› 2026, Vol. 48 ›› Issue (3): 757-773.DOI: 10.3969/j.issn.0253-4967.20240164

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LATE QUATERNARY ACTIVITY FEATURES OF THE NANLIU SEGMENT OF THE ANQIU-JUXIAN FAULT IN THE TANLU FAULT ZONE

FU Jun-dong¹⁾(), WU Hai-ying²⁾^,^*(), ZHANG Jian-min¹⁾, LU Zi-lin¹⁾, XIA Nuan¹⁾, LI Zhi-heng¹^,³⁾, WANG Lei¹^,⁴⁾, ZOU Qi-feng⁵⁾

¹⁾ Shandong Earthquake Agency, Jinan 250014, China
²⁾ Liaocheng Housing and Construction Development Support Center, Liaocheng 252000, China
³⁾ Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
⁴⁾ State Key Laboratory of Earthquake Dynamics and Forecasting, Institute of Geology, China Earthquake Administration, Beijing 100029, China
⁵⁾ Shandong Luzhen Science and Technology Engineering Limited Liability Company, Jinan 250014, China

Received:2025-02-23 Revised:2025-06-09 Online:2026-06-20 Published:2026-07-09

郯庐断裂带安丘-莒县断裂南流段晚第四纪活动特征

付俊东¹⁾(), 吴海英²⁾^,^*(), 张建民¹⁾, 鹿子林¹⁾, 夏暖¹⁾, 李志恒¹^,³⁾, 王雷¹^,⁴⁾, 邹奇峰⁵⁾

¹⁾ 山东省地震局, 济南 250102
²⁾ 聊城市住房与建设事业保障中心, 聊城 252000
³⁾ 中国地震局地球物理研究所, 北京 100081
⁴⁾ 地震动力学与强震预测全国重点实验室(中国地震局地质研究所), 北京 100029
⁵⁾ 山东省鲁震科技工程有限公司, 济南 250014

通讯作者: *吴海英, 女, 1976年生, 硕士, 高级工程师, 从事建筑工程抗震与震害防御研究, E-mail: whydmm@163.com。
作者简介:
付俊东, 男, 1986年生, 2012年于中国地震局地震预测研究所获构造地质学硕士学位, 高级工程师, 主要从事活动构造研究, E-mail: 721824801@qq.com。
基金资助:
山东郯城巨震区低速率挤压逆冲构造野外科学观测研究站; 中国地震局地震科技星火计划项目(XH25014YA); 山东省地震局地震构造团队和山东省地震局重点业务专项(YW2305); 山东省地震局地震构造团队和山东省地震局重点业务专项(YW2303)

Abstract

Abstract:

The Tanlu fault zone is the largest deep-seated fault zone in eastern China, and its Late Quaternary activity remains a key and challenging issue in geological research. This study focuses on the Nanliu segment of the Anqiu-Juxian fault, one of the most active sections of the Tanlu fault zone, and investigates its Late Quaternary activity characteristics, including shallow fault structure, burial depth of the upper fault tip, stratigraphic displacement, vertical slip rate, and related features.

Because the southern segment of the Anqiu-Juxian Fault is mainly expressed as a blind fault, this study employed an integrated approach combining high-resolution shallow seismic reflection profiling with borehole-constrained geological section analysis. Two high-resolution shallow seismic reflection profiles and two borehole-constrained geological sections were completed, and 23 geochronological samples were collected and analyzed. The resulting shallow structural profiles suggest that the southern segment of the Anqiu-Juxian Fault mainly consists of a western branch fault and an eastern branch fault.

The borehole-constrained section at Songjia village reveals that the eastern branch of the Anqiu-Juxian Fault comprises two branch faults, f₁ and f₂, from west to east. These faults dip eastward at an apparent angle of approximately 80°, exhibit reverse-faulting characteristics, and are arranged in a high-angle stepped pattern. The shallowest burial depth of the upper fault tip of f₁ is approximately 3.85m, and its latest activity is dated to (53.9±2.9) to (58.2±2.3)ka. Variations in displacement among the lower strata indicate multiphase activity of the f₁ fault, with an average vertical slip rate of approximately 0.03mm/a. The upper fault tip of f₂ is buried at a depth of approximately 16.9~18.5m. In the lower part of the borehole core from this section, clear slickensides and densely developed high-angle foliations were observed, indicating dextral-reverse faulting.

The borehole-constrained section at Qiancao Village shows that the western branch of the Anqiu-Juxian Fault consists of five faults, f₁-f₅, from west to east. These faults dip at approximately 80°, display normal-faulting characteristics, and are distributed in a high-angle stepped pattern. All faults cut the overlying Late Pleistocene strata, with a vertical displacement of approximately 7.0m. Among them, f₁ has the shallowest upper fault tip, buried at approximately 9.7m, and its latest activity is dated to (54.8±3.4) to (78.4±3.2)ka. In the lower part of the borehole core from this section, relatively fresh purplish-red fault gouge, slickensides with a dip angle of approximately 40°, and densely developed high-angle schistosity were observed, indicating dextral-normal faulting.

Both the eastern and western branch faults are composed of multiple secondary faults. The occurrence of slickensides, fault gouge, and schistosity in the lower parts of the borehole cores collectively suggests that the fault zone exhibits both reverse and normal components under a dextral transpressional stress regime. The upper fault tips of the eastern branch are shallower than those of the western branch, indicating stronger activity along the eastern branch. Differences in displacement among different lower stratigraphic levels of the eastern branch fault are inferred to result from multiphase fault activity. A large number of liquefiable soil layers, including silty fine sand, medium-fine sand, and medium-coarse sand, are distributed in the borehole-constrained geological sections. However, no evidence of seismic liquefaction, such as sand veins, was identified. This suggests that the surface rupture zone of the 1668 Tancheng earthquake did not extend into the study area.

The 2011 M_W9.0 Tohoku earthquake in Japan significantly modified the stress state of the northeastern and North China sections of the Tanlu fault zone, promoting seismic energy accumulation in the Yishu fault zone. In 2024, the Nanliu segment of the Anqiu-Juxian fault, located in the northern part of the Tanlu fault zone, was affected by a M_W4.7 earthquake and several moderate aftershocks close to magnitude 4 in the Feidong area at the southern end of the Tanlu fault zone. This event represents the largest earthquake along the Tanlu fault zone in recent years. Considering that the Nanliu segment contains multiple normal and reverse faults, has shallow upper fault tips and complex fault structures, has remained strongly active since the late Quaternary, and has repeatedly been identified as a national seismic risk zone, this segment is considered to pose a certain level of seismic hazard. Further monitoring and investigation of this area are therefore recommended.

The results of this study provide fundamental data for major engineering site selection, urban planning and construction, and earthquake disaster prevention. They also offer reference value for understanding geodynamic issues related to the structural evolution of the Tanlu fault zone.

Key words: Tanlu fault zone, Anqiu-Juxian Fault, active fault, high resolution shallow reflection seismic profile, drilling joint profile exploration

摘要：

文中通过实施2条高分辨率浅层地震反射剖面和2条钻孔联合地质剖面, 对郯庐断裂带安丘-莒县断裂南流段晚第四纪活动特征进行了系统研究。地震反射剖面揭示该断裂段由西支和东支2条主要断裂组成。宋家村钻孔联合地质剖面显示, 东支断裂自西向东发育呈阶梯状分布的断层f₁和f₂, 均倾向E, 最浅上断点埋深约3.85m, 垂直错断上更新统约1.9m。通过年代学测试获得其最新活动时代为(53.9±2.9)~(58.2±2.3)ka BP, 计算得到其垂向滑动速率约为0.03mm/a, 结合在岩心中发现的擦痕和高角度密集片理等构造现象, 判定东支断裂为晚更新世中期活动的右旋逆断层。前曹村钻孔联合地质剖面揭示西支断裂自西向东发育呈阶梯状分布的5条断层(f₁—f₅), 均倾向E, 最浅的上断点埋深约9.7m, 最新活动时代为(54.8±3.4)~(78.4±3.2)ka BP。在岩心中发现的紫红色断层泥、擦痕及高角度密集片理等现象表明西支断裂具有右旋正断性质。在2处钻孔联合地质剖面中均未发现地震液化现象, 据此推断1668年郯城地震的地表破裂带未延伸至本文研究区。 2024年郯庐断裂带南端的肥东地区发生的4.7级地震和多次近4级的余震, 是郯庐断裂带近年来的最大地震; 相比之下, 位于郯庐断裂带中部的南流段发育多条断裂活动性较强的正断层和逆断层, 其断裂活动水平明显高于肥东地区。分析认为南流段具有一定的地震危险性, 建议加强关注。

关键词: 郯庐断裂带, 安丘-莒县断裂, 活动断裂, 高分辨率浅层地震反射剖面, 钻孔联合地质剖面

FU Jun-dong, WU Hai-ying, ZHANG Jian-min, LU Zi-lin, XIA Nuan, LI Zhi-heng, WANG Lei, ZOU Qi-feng. LATE QUATERNARY ACTIVITY FEATURES OF THE NANLIU SEGMENT OF THE ANQIU-JUXIAN FAULT IN THE TANLU FAULT ZONE[J]. SEISMOLOGY AND GEOLOGY, 2026, 48(3): 757-773.

付俊东, 吴海英, 张建民, 鹿子林, 夏暖, 李志恒, 王雷, 邹奇峰. 郯庐断裂带安丘-莒县断裂南流段晚第四纪活动特征[J]. 地震地质, 2026, 48(3): 757-773.

Figures/Tables 11

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编号	起点坐标	终点坐标	长度	道距 /m	最小偏移 /m	接收道数	覆盖次数	记录长度 /ms
C1	36.609°N, 119.314°E	36.612°N, 119.333°E	1766	2	16	96	12	2000
C2	36.574°N, 119.285°E	36.573°N, 119.312°E	2494	2	24	72	9	1000

编号	起点坐标	终点坐标	长度	道距 /m	最小偏移 /m	接收道数	覆盖次数	记录长度 /ms
C1	36.609°N, 119.314°E	36.612°N, 119.333°E	1766	2	16	96	12	2000
C2	36.574°N, 119.285°E	36.573°N, 119.312°E	2494	2	24	72	9	1000

样品编号	野外编号	岩性	埋深 /m	环境剂量率 /Gy·ka^-1	等效剂量 /Gy	释光年龄 /ka	样品来源
2023-0039	K2-OSL-2	粉土	4.5	2.5±0.3	118.6±7.0	47.5±2.8	前曹村钻孔联合地质剖面
2023-0040	K2-OSL-4	粉质黏土	8.3	2.4±0.3	132.1±8.2	54.8±3.4
2023-0041	K2-OSL-7	粉质黏土	13.35	2.3±0.3	179.6±7.3	78.4±3.2
2023-0042	K3-OSL-2	粉土	3.3	2.5±0.3	120.6±5.5	48.2±2.2
2023-0043	K3-OSL-11	粉细砂	23.8	2.3±0.3	171.9±10.2	75.7±4.5
2023-0044	K7-OSL-4	粉土	9.2	2.2±0.3	136.6±5.4	61.0±2.4
2023-0045	K7-OSL-9	粉质黏土	22.9	2.0±0.3	161.8±4.6	80.1±2.3
2023-0051	Z3-OSL-3	粉土	5.8	2.2±0.3	128.7±7.0	58.2±3.2	宋家村钻孔联合地质剖面
2023-0052	Z3-OSL-6	粉质黏土	12.35	2.1±0.3	144.2±4.7	67.7±2.2
2023-0053	Z3-OSL-8	粉质黏土	18.55	2.2±0.3	155.5±6.9	72.0±3.2
2023-0054	Z3-OSL-11	粉质黏土	27	2.1±0.3	169.4±7.0	80.7±3.3
2023-0055	Z3-OSL-13	粉质黏土	36.4	1.9±0.3	180.5±7.0	95.0±3.7
2023-0056	Z3-OSL-15	粉质黏土	49.25	1.9±0.3	198.9±8.2	104.7±4.3
2023-0057	Z3-OSL-17	粉质黏土	63.7	1.3±0.3	165.0±7.0	126.9±5.4
2023-0058	Z4-OSL-2	粉质黏土	3.9	2.1±0.3	121.3±5.4	57.5±2.6
2023-0059	Z4-OSL-6	砾石土	11.65	2.3±0.3	149.1±4.9	64.0±2.1
2023-0060	Z4-OSL-7	粉质黏土	13.45	2.3±0.3	160.3±4.8	70.6±2.1
2023-0061	Z4-OSL-12	粉砂	27.3	1.5±0.3	195.2±15.3	130.2±10.2
2023-0062	Z7-OSL-3	含姜石粉质黏土	14.6	2.1±0.3	159.6±4.7	74.6±2.2
2023-0075	Z3-OSL-1	粉土	2.1	2.4±0.3	44.1±4.7	18.3±2.0
2023-0076	Z3-OSL-2	粉土	3.7	2.5±0.3	134.7±7.3	53.9±2.9

样品编号	野外编号	岩性	埋深 /m	环境剂量率 /Gy·ka^-1	等效剂量 /Gy	释光年龄 /ka	样品来源
2023-0039	K2-OSL-2	粉土	4.5	2.5±0.3	118.6±7.0	47.5±2.8	前曹村钻孔联合地质剖面
2023-0040	K2-OSL-4	粉质黏土	8.3	2.4±0.3	132.1±8.2	54.8±3.4
2023-0041	K2-OSL-7	粉质黏土	13.35	2.3±0.3	179.6±7.3	78.4±3.2
2023-0042	K3-OSL-2	粉土	3.3	2.5±0.3	120.6±5.5	48.2±2.2
2023-0043	K3-OSL-11	粉细砂	23.8	2.3±0.3	171.9±10.2	75.7±4.5
2023-0044	K7-OSL-4	粉土	9.2	2.2±0.3	136.6±5.4	61.0±2.4
2023-0045	K7-OSL-9	粉质黏土	22.9	2.0±0.3	161.8±4.6	80.1±2.3
2023-0051	Z3-OSL-3	粉土	5.8	2.2±0.3	128.7±7.0	58.2±3.2	宋家村钻孔联合地质剖面
2023-0052	Z3-OSL-6	粉质黏土	12.35	2.1±0.3	144.2±4.7	67.7±2.2
2023-0053	Z3-OSL-8	粉质黏土	18.55	2.2±0.3	155.5±6.9	72.0±3.2
2023-0054	Z3-OSL-11	粉质黏土	27	2.1±0.3	169.4±7.0	80.7±3.3
2023-0055	Z3-OSL-13	粉质黏土	36.4	1.9±0.3	180.5±7.0	95.0±3.7
2023-0056	Z3-OSL-15	粉质黏土	49.25	1.9±0.3	198.9±8.2	104.7±4.3
2023-0057	Z3-OSL-17	粉质黏土	63.7	1.3±0.3	165.0±7.0	126.9±5.4
2023-0058	Z4-OSL-2	粉质黏土	3.9	2.1±0.3	121.3±5.4	57.5±2.6
2023-0059	Z4-OSL-6	砾石土	11.65	2.3±0.3	149.1±4.9	64.0±2.1
2023-0060	Z4-OSL-7	粉质黏土	13.45	2.3±0.3	160.3±4.8	70.6±2.1
2023-0061	Z4-OSL-12	粉砂	27.3	1.5±0.3	195.2±15.3	130.2±10.2
2023-0062	Z7-OSL-3	含姜石粉质黏土	14.6	2.1±0.3	159.6±4.7	74.6±2.2
2023-0075	Z3-OSL-1	粉土	2.1	2.4±0.3	44.1±4.7	18.3±2.0
2023-0076	Z3-OSL-2	粉土	3.7	2.5±0.3	134.7±7.3	53.9±2.9

实验室编号	野外编号	石墨量/mg	现代碳比值Fm值	Δ¹⁴C	¹⁴C年龄
23061203OCSP	K8-¹⁴C-2	1.00	0.6304±0.0022	-369.3±2.2	(3705±30)aBP
23061204OCSP	K7-¹⁴C-3	0.87	0.6292±0.0020	-370.8±2.0	(3720±30)aBP

LATE QUATERNARY ACTIVITY FEATURES OF THE NANLIU SEGMENT OF THE ANQIU-JUXIAN FAULT IN THE TANLU FAULT ZONE

郯庐断裂带安丘-莒县断裂南流段晚第四纪活动特征

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