Article(id=1322959348812611666, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1322959347470442879, articleNumber=null, orderNo=null, doi=10.14075/j.jgg.2024.04.152, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1712419200000, receivedDateStr=2024-04-07, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793347688152, onlineDateStr=2026-10-30, pubDate=1739548800000, pubDateStr=2025-02-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793347688152, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793347688152, creator=13701087609, updateTime=1793347688152, updator=13701087609, issue=Issue{id=1322959347470442879, tenantId=1146029695717560320, journalId=1281212831689347082, year='2025', volume='45', issue='2', pageStart='111', pageEnd='220', issueExtLink='null', onlineDate='null', pubDate='1739548800000', pubDateStr='2025-02-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793347687833, creator='13701087609', updateTime=1793347687833, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=151, endPage=156, ext={EN=ArticleExt(id=1322959348992966739, articleId=1322959348812611666, tenantId=1146029695717560320, journalId=1281212831689347082, language=EN, title=Positioning and Activity of the Buried Fault along the Northern Margin of Zhongwei Basin Based on Shallow Seismic and Drilling, columnId=null, journalTitle=Journal of Geodesy and Geodynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=

In order to investigate the tectonic characteristics, planar distribution, and active period of the buried fault (Hetan-Guotan buried fault) in the northern margin of Zhongwei basin, Ningxia, we apply the method of shallow seismic exploration to the attitude, character, position and burial depths of uppermost aspects of this buried fault. Furthermore, the composite drilling section explores the exact location and more reliable uppermost point, and we identify the latest active period of this buried fault by a sample dating test. The results show that the Hetan-Guotan buried fault is a normal fault trending near EW and dipping S, extending for approximately 12.5 km. The uppermost point of this fault is buried at a depth of more than 38 m, and the apparent dip of the fault is 75°. The Hetan-Guotan buried fault is not an active fault, because its latest active period was the middle-late middle Pleistocene, and it has been inactive at the end middle Pleistocene and since the late Pleistocene.

, authors=Chao LIU1, Xinsheng HUA2, Duo WANG3, Qiyun LEI1, Zhiqun WU1, Sihan YU1, authorsList=Chao LIU, Xinsheng HUA, Duo WANG, Qiyun LEI, Zhiqun WU, Sihan YU, authorCompany=null, correspAuthors=null, authorNote=

LIU Chao, engineer, majors in urban active fault detection and active tectonics, E-mail:

, correspAuthorsNote=null, copyrightStatement=All rights reserved, without authorization, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322959352319049826, articleId=1322959348812611666, tenantId=1146029695717560320, journalId=1281212831689347082, language=CN, title=基于浅震和钻探的中卫盆地北缘隐伏断层定位及活动性研究, columnId=1322506193558422163, journalTitle=大地测量与地球动力学, columnName=地震地质, runingTitle=null, highlight=null, articleAbstract=

为查明宁夏中卫盆地北缘隐伏断层(河滩-郭滩隐伏断层)的构造特征、展布情况及活动时代, 采用浅层地震勘探方法获得该隐伏断层的产状、性质、位置和上断点埋深。在此基础上, 利用钻孔联合剖面探测出断层的准确位置和更可靠的上断点埋深, 并测试样品年代确定该隐伏断层的最新活动时代。结果表明, 河滩-郭滩隐伏断层是一条走向近EW、倾向S的正断层, 长度约12.5 km; 断层上断点埋深在38 m以下, 视倾角75°;最新活动时代为中更新世中晚期, 晚更新世以来不活动, 不属于活动断层。

, authors=刘超1, 花鑫升2, 王度3, 雷启云1, 武治群1, 余思汗1, authorsList=刘超, 花鑫升, 王度, 雷启云, 武治群, 余思汗, authorCompany=null, correspAuthors=null, authorNote=

刘超, 工程师, 主要从事城市活动断层探测和活动构造研究, E-mail:

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LIU Chao, engineer, majors in urban active fault detection and active tectonics, E-mail:

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LIU Chao, engineer, majors in urban active fault detection and active tectonics, E-mail:

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刘超, 工程师, 主要从事城市活动断层探测和活动构造研究, E-mail:

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刘超, 工程师, 主要从事城市活动断层探测和活动构造研究, E-mail:

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Acquisition parameters of the observational system and seismic data

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测线名称 探测方向 观测系统参数 炮数 地震仪采集参数 测线长度/m
道间距/m 偏移距/m 接收道数 覆盖次数 采样间隔/ms 记录长度/s
C1 S→N 3 0 300 30 692 0.5 2 10 200
C2 S→N 2 0 300 30 340 0.5 2 3 606
C3 S→N 2 0 300 30 397 0.5 2 4 220
C4 S→N 8 0 340 34 403 1.0 4 17 160
C5 S→N 2 0 300 30 539 0.5 2 5 200
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观测系统和地震数据采集参数

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测线名称 探测方向 观测系统参数 炮数 地震仪采集参数 测线长度/m
道间距/m 偏移距/m 接收道数 覆盖次数 采样间隔/ms 记录长度/s
C1 S→N 3 0 300 30 692 0.5 2 10 200
C2 S→N 2 0 300 30 340 0.5 2 3 606
C3 S→N 2 0 300 30 397 0.5 2 4 220
C4 S→N 8 0 340 34 403 1.0 4 17 160
C5 S→N 2 0 300 30 539 0.5 2 5 200
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Fault parameters interpreted by shallow seismic exploration

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测线名称 上断点位置/m 错断界面 上断点深度/m 垂直断距/m 断层性质 视倾向 视倾角/(°) 可靠性
C1 7 422 T2及以下 136 2~4 正断层 S 78 可靠
C2 894 T2及以下 47 2~4 正断层 S 69 较可靠
C3 1 164 T2及以下 50 2~4 正断层 S 62~79 可靠
C4 9 776 T2及以下 75 2~4 正断层 S 48 较可靠
C5 4 096 T2及以下 49 5~7 正断层 S 58 可靠
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浅层地震勘探解释的断层参数

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测线名称 上断点位置/m 错断界面 上断点深度/m 垂直断距/m 断层性质 视倾向 视倾角/(°) 可靠性
C1 7 422 T2及以下 136 2~4 正断层 S 78 可靠
C2 894 T2及以下 47 2~4 正断层 S 69 较可靠
C3 1 164 T2及以下 50 2~4 正断层 S 62~79 可靠
C4 9 776 T2及以下 75 2~4 正断层 S 48 较可靠
C5 4 096 T2及以下 49 5~7 正断层 S 58 可靠
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The results about dating test of three samples

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序号钻孔 深度/m U/10-6 Th/10-6 K/% 含水率/% 剂量率/Gy·ka-1 等效剂量/Gy 距今年龄/ka
1 Z4 3.80 3.15±0.07 13.06±0.33 2.21±0.01 10±5 4.53 ± 0.26 45.70 ± 1.63 10.09 ± 0.68
2 Z3 28.80 1.09±0.13 4.87±0.50 1.27±0.05 10±5 1.78 ± 0.08 227.04 ± 10.22 127.27 ± 8.14
3 Z3 42.60 1.88±0.09 7.40±0.15 1.52±0.04 10±5 2.34 ± 0.09 351.56 ± 12.36 150.24 ± 7.69
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3个样品的年代测试结果

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序号钻孔 深度/m U/10-6 Th/10-6 K/% 含水率/% 剂量率/Gy·ka-1 等效剂量/Gy 距今年龄/ka
1 Z4 3.80 3.15±0.07 13.06±0.33 2.21±0.01 10±5 4.53 ± 0.26 45.70 ± 1.63 10.09 ± 0.68
2 Z3 28.80 1.09±0.13 4.87±0.50 1.27±0.05 10±5 1.78 ± 0.08 227.04 ± 10.22 127.27 ± 8.14
3 Z3 42.60 1.88±0.09 7.40±0.15 1.52±0.04 10±5 2.34 ± 0.09 351.56 ± 12.36 150.24 ± 7.69
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基于浅震和钻探的中卫盆地北缘隐伏断层定位及活动性研究
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刘超 1 , 花鑫升 2 , 王度 3 , 雷启云 1 , 武治群 1 , 余思汗 1
大地测量与地球动力学 | 地震地质 2025,45(2): 151-156
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大地测量与地球动力学 |地震地质 2025 , 45 (2) : 151 -156
基于浅震和钻探的中卫盆地北缘隐伏断层定位及活动性研究
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刘超1 , 花鑫升2, 王度3, 雷启云1, 武治群1, 余思汗1
作者信息
  • 1 宁夏回族自治区地震局, 银川市北京东路244号, 750001
  • 2 中国地震局地球物理勘探中心, 郑州市文化路75号, 450002
  • 3 桂林理工大学地球科学学院, 桂林市雁山街319号, 541006
作者简介:

刘超, 工程师, 主要从事城市活动断层探测和活动构造研究, E-mail:

Positioning and Activity of the Buried Fault along the Northern Margin of Zhongwei Basin Based on Shallow Seismic and Drilling
Chao LIU1 , Xinsheng HUA2, Duo WANG3, Qiyun LEI1, Zhiqun WU1, Sihan YU1
Affiliations
  • 1 Earthquake Agency of Ningxia Hui Autonomous Region, 244 East-Beijing Road, Yinchuan 750001, China
  • 2 Geophysical Exploration Center, CEA, 75 Wenhua Road, Zhengzhou 450002, China
  • 3 College of Earth Sciences, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China
  • LIU Chao, engineer, majors in urban active fault detection and active tectonics, E-mail:

出版时间: 2025-02-15 doi: 10.14075/j.jgg.2024.04.152
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为查明宁夏中卫盆地北缘隐伏断层(河滩-郭滩隐伏断层)的构造特征、展布情况及活动时代, 采用浅层地震勘探方法获得该隐伏断层的产状、性质、位置和上断点埋深。在此基础上, 利用钻孔联合剖面探测出断层的准确位置和更可靠的上断点埋深, 并测试样品年代确定该隐伏断层的最新活动时代。结果表明, 河滩-郭滩隐伏断层是一条走向近EW、倾向S的正断层, 长度约12.5 km; 断层上断点埋深在38 m以下, 视倾角75°;最新活动时代为中更新世中晚期, 晚更新世以来不活动, 不属于活动断层。

浅层地震勘探  /  钻孔联合剖面探测  /  中卫盆地  /  隐伏断层  /  活动性

In order to investigate the tectonic characteristics, planar distribution, and active period of the buried fault (Hetan-Guotan buried fault) in the northern margin of Zhongwei basin, Ningxia, we apply the method of shallow seismic exploration to the attitude, character, position and burial depths of uppermost aspects of this buried fault. Furthermore, the composite drilling section explores the exact location and more reliable uppermost point, and we identify the latest active period of this buried fault by a sample dating test. The results show that the Hetan-Guotan buried fault is a normal fault trending near EW and dipping S, extending for approximately 12.5 km. The uppermost point of this fault is buried at a depth of more than 38 m, and the apparent dip of the fault is 75°. The Hetan-Guotan buried fault is not an active fault, because its latest active period was the middle-late middle Pleistocene, and it has been inactive at the end middle Pleistocene and since the late Pleistocene.

shallow seismic exploration  /  composite drilling section exploration  /  Zhongwei basin  /  buried fault  /  activity
刘超, 花鑫升, 王度, 雷启云, 武治群, 余思汗. 基于浅震和钻探的中卫盆地北缘隐伏断层定位及活动性研究. 大地测量与地球动力学, 2025 , 45 (2) : 151 -156 . DOI: 10.14075/j.jgg.2024.04.152
Chao LIU, Xinsheng HUA, Duo WANG, Qiyun LEI, Zhiqun WU, Sihan YU. Positioning and Activity of the Buried Fault along the Northern Margin of Zhongwei Basin Based on Shallow Seismic and Drilling[J]. Journal of Geodesy and Geodynamics, 2025 , 45 (2) : 151 -156 . DOI: 10.14075/j.jgg.2024.04.152
大多数城市内的活动断层隐伏于地下,一旦因突然快速错动导致“直下型”地震,会引起巨大的灾害[1]。因此,探清城市隐伏断层的位置、性质及活动性,并采取设防避让措施,是降低地震断层破坏、减少生命财产损失的有效途径[2]。目前,对于城市地下隐伏断层的探测主要采用浅层地震勘探和钻孔联合剖面探测相结合的方法[3-4],同时利用沉积地层样品的年代测试结果确定断层的活动性[5]。
中卫盆地长轴呈NW向,长约48 km,宽约20 km,黄河以北第四系地层厚度可达300 m,晚更新世以来其内部隐伏断层“有没有”和“活不活”的问题影响着城市的安全,因此开展城市活动断层探测工作具有十分重要的意义。本文通过浅层地震勘探技术获取高分辨率的近地表地震反射时间剖面,定位中卫盆地北缘隐伏断层,并提供可靠的断层上断点;结合钻孔联合剖面探测和样品年代测试结果,分析和确定断层的最新活动时代。本文成果填补了对中卫盆地内部隐伏断层详细研究的空白,可为中卫市的发展规划、重大工程建设选址和地区防震减灾提供依据,也可为其他城市活动断层探测和地震危险性评价工作提供参考。
中卫盆地位于宁夏回族自治区中卫市北部,处在宁夏、内蒙和甘肃3地交界的关键区域,黄河自西向东流过。中卫市是丝绸之路和河西走廊东西交通的重要城市,随着城区建设的迅速发展,人口和重点工程陆续增多。中卫盆地与其北侧的卫宁北山为阿拉善地块和青藏高原东北缘的边界。盆地南侧的香山-天景山断裂晚新生代以来逆冲、左旋走滑活动强烈,1709年发生中卫南7 1/2级地震,产生约60 km的地震地表破裂带,一直是国内外学者研究的热点[6-10];而盆地北侧的卫宁北山南缘断层(图1)规模较小,且经初步鉴定不是活动断层。盆地内部发现一条EW向隐伏正断层,但未开展详细研究[11]。
前人对中卫盆地的黄河、地层沉积特征、地下速度结构、中上地壳电性结构和水文地质等开展过研究[12-15],但缺乏对盆地内部活动断层的详细探测,以至于无法判断其准确位置和活动性,仅在卫宁北山南缘布设了3条浅层地震勘探测线,揭示了多条断层的存在。其中,南侧的一支断层位于盆地内部且错断第四系地层,上断点埋深40~60 m,推测为隐伏正断层[11],平面展布和最新活动时代暂不清楚。本文通过5条浅层地震勘探测线C1~C5(图1)控制并确定该隐伏断层的具体位置和上断点埋深,并将其命名为河滩-郭滩隐伏断层,然后利用钻孔联合剖面探测和样品年代测试结果分析和鉴定断层的活动性。
为有效定位隐伏断层,本文浅层地震勘探采用多次覆盖反射波法。地震数据使用428XL遥测数字地震仪进行采集;检波器固有频率为60 Hz,每个接收点上采用由3个检波器组合而成的检波器串;机械震源采用两台抗干扰能力强的AHV4C可控震源车,激震频率范围为10~250 Hz,可选线性扫描和非线性扫描,最大出力28 t。通过现场实验,可控震源工作参数设定为连续变频扫描,扫描频率范围为20~180 Hz,扫描长度12 s,各测线的详细采集参数见表1。
资料处理使用Focus地震反射处理系统,根据原始地震记录中反射波能量较强、干扰波能量较弱、记录信噪比较高的特点,将提高地震资料分辨率的目的放在首位,可有效保护和恢复地震记录中的有效宽、高频反射信息。处理过程中主要的技术流程包括数据解编、叠前去噪、数字滤波、反褶积、静校正、动校正、剩余静校正、数字分析、共中心点叠加、叠后偏移和叠后去噪等。
原始地震数据经资料处理后得到地震反射时间剖面(图2~6),横坐标为测线桩号(单位m),纵坐标为不同地层反射波的双程垂直到时(单位s)。在剖面图上分别用T1、T2、T3、TQ、TN表示不同的反射界面,其中TQ代表第四系沉积层底界,TN代表新近系沉积层底界,T1、T2和T3为第四系内部地层界面。
基于反射波识别的标准和断层判定的依据,结合该地区地质构造特点,通过对浅层地震勘探数据的解释,得到5条测线的时间剖面。
测线C1的道间距为3 m,由南向北布设,全长10 200 m。图2为测线C1断层附近的时间剖面,可以看出,地层界面反射比较丰富,解释的5个反射波组分别为T1、T2、T3、TQ、TN。剖面上的强反射同相轴呈南低北高的形态,解释的断层位于测线桩号7 422 m处,为视倾向南的正断层,错断了T2及以下所有地层的反射同相轴,可分辨的上断点埋深约为136 m。
测线C2的道间距为2 m,由南向北布设,全长3 606 m。图3为测线C2的时间剖面,针对该剖面的反射波组特征,解释的4个反射波组分别为T1、T2、TQ、TN。该剖面反射震相丰富,反射界面T1可被清晰、连续地追踪。根据剖面反射波组特征,在桩号894 m处解释为视倾向南的正断层,上断点埋深约47 m。断层以北地层呈南低北高的趋势,剖面北部整体向上抬升。
测线C3的道间距为2 m,由南向北布设,全长4 220 m。图4为测线C3的时间剖面,该测线经过地段的地层界面反射非常丰富,且展布特征比较复杂,根据反射波组特征解释了4个明显的反射波组T1、T2、TQ、TN。总体来看,该剖面可分为3个具有明显不同反射特征的区域,在测线桩号850 m以南,剖面上的一系列反射层呈近水平展布,各反射波同相轴之间相互平行;在测线桩号约1 164~3 250 m之间,剖面上多组强反射向南倾斜,反射同相轴T1和T2向上尖灭,基底面凹凸不平,表现为基底斜坡区;在测线桩号约3 250 m以北,反射同相轴T1和T2已经尖灭,TQ、TN近水平展布,对应沉积地层减薄。根据上述反射波组特征,解释了两条断层,表现为“Y”字形组合,其中以位于测线桩号1 164 m处视倾向南的正断层为主,错断了T2及以下所有地层的反射同相轴,可分辨的上断点埋深约为50 m。
测线C4的道间距为8 m,由南向北布设,全长17 160 m。图5为测线C4断层附近的时间剖面,可以看出,南部具有丰富的地层界面反射波组,解释的4个反射波组分别为T1、T2、TQ、TN;北部基底面凹凸不平,并随着深度的增加,多组倾斜反射同相轴的倾角逐渐增大,表现为典型的基底斜坡区。解释的断层位于测线桩号9 776 m处,为视倾向南的正断层,可分辨的上断点埋深约为75 m。
测线C5的道间距为2 m,由南向北布设,全长5 200 m。图6为测线C5的时间剖面,可以看出,在测线桩号3 700 m以南,多组反射同相轴向南倾斜,呈南低北高的趋势。解释了4个反射波组T1、T2、TQ、TN,在测线桩号3 700 m以北,反射同相轴连续性变差,难以识别出较连续的反射震相,故没有画出反射波组。解释的断层为视倾向南的正断层,位于桩号4 096 m处,向上错断T2,可分辨的上断点埋深约为49 m。
综合上述5条测线剖面来看,解释的断层均为视倾向南的正断层,性质相同且产状一致(具体参数见表2),其位置在卫宁北山南缘断层的南侧,位于中卫盆地北缘。本次浅层地震勘探工作还在测线C1的西侧和测线C5的东侧布设有两条控制性测线,但这两条剖面没有出现与上述性质和产状相似的断层,推测该断层止于测线C1和C5附近。故仅将这5条测线剖面的断层上断点在地表的投影点连接起来,平面上构成一条走向近EW、倾向S的隐伏正断层,结合地形地貌特征向西进行推测延伸,东端止于测线C5,确定断层长度约为12.5 km,并根据其经过的地名将其命名为河滩-郭滩隐伏断层(图1)。
为鉴定该隐伏断层的活动性,并验证浅层地震勘探解释的正确性,布设一条与测线C2平行的跨断层钻孔联合剖面,剖面与断层走向呈大角度相交(图1)。该剖面有效钻孔8个,实际长度为99.4 m,最大孔间距23.4 m,最小孔间距4.5 m,平均孔间距14.2 m;累计进尺658.26 m,单孔最大深度90.38 m,最小深度65.94 m。
图7为综合8个钻孔结果绘制的联合剖面,根据钻孔岩芯,将地层从上至下分为5层。
第1层:浅灰色耕植土和素填土为主,分布在钻孔约5 m深度以上,厚度略有变化,中部较厚,向北、向南略有变薄,平均厚度4.8 m。
第2层:杂色卵砾石为主,成分复杂,磨圆和分选较好,分布在钻孔约5~30 m深度区间,中部较薄,向北、向南略有变厚,平均厚度22.2 m。
第3层:浅黄色中细砂-粗砂、砾砂-黏砂土层序,分布在钻孔约30~48 m深度区间,南部厚度较大,向北逐渐减薄。该层和上部卵砾石层的岩性有明显差异,这与测线C2剖面的T1反射波组相对应。
第4层:浅黄-深黄色粗砂和砾砂为主,夹浅红色砂黏土,分布在钻孔约48~75 m深度区间,中部因断层存在较厚,向北、向南变薄,底界面附近砾石明显增多,且砾径增大。
第5层:深红色砂黏土和黏土为主,局部含粉细砂,分布在钻孔约75 m深度以下,未见底界。
钻孔联合剖面揭示的河滩-郭滩隐伏断层非常清晰。断层断错第4层底界和第5层顶界,落差10.57 m,但被第3层底部的黏砂土覆盖,上断点埋深在38 m以下,视倾角75°,倾向南,上断点投影地表的位置在浅层地震勘探初始给出的位置偏北约22 m处。表3详细列出了3个样品的年代测试情况,根据结果推测,第1层为全新统地层,第2层为上更新统地层,第3层为上中更新统地层,第4层为中上中更新统地层,第5层为中中更新统地层。河滩-郭滩隐伏断层断错了中上中更新统地层,但被上中更新统地层覆盖,因此其最新活动时代为中更新世中晚期,晚更新世以来不活动,不属于活动断层。
对比测线C2的时间剖面可以看出,反射波组分层和断层特征基本与钻孔联合剖面对应,浅震解释的与钻探揭示的河滩-郭滩隐伏断层位置和性质基本相近,但受浅震资料分辨率的限制,上断点埋深要大于钻探得到的上断点埋深,且浅震初始解释的断层地表投影位置与钻探偏差约22 m。
区域地质构造的最新研究表明,中卫盆地主要受青藏高原东北缘强烈活动的弧形构造带,即香山-天景山断裂控制[16]。青藏高原东北缘弧形构造带通过次级地块逐次向外推挤实现扩展,其中之一的香山-天景山断裂晚新生代具有两个阶段的构造演化过程:早期香山-天景山地块受到推挤作用越来越强烈,并开始向东北运动,香山-天景山断裂表现为逆冲性质;晚期香山-天景山地块向东北运动受阻后,开始向阻碍作用相对偏弱的东侧运动,香山-天景山断裂转换为走滑性质,走滑位移被东南端部的挤压构造所吸收。开始逆冲的时间可能在上新世初期,即5.4 Ma BP,左旋走滑起始时间为上新世末期,即2.6 Ma BP[17]。第四纪初更新世以来,SEE向的香山-天景山断裂转变为逆冲-左旋走滑活动方式,河滩-郭滩隐伏断层可能正是受香山-天景山断裂活动的影响。香山-天景山断裂的大规模和高活动性导致走滑变形主要集中在中卫盆地南侧,位于盆地北缘的河滩-郭滩小型隐伏断层在中更新世中晚期的活动本身偏弱,晚更新世完全停止活动。
结果表明,河滩-郭滩隐伏断层的规模小,长度约12.5 km,晚更新世以来不活动,虽然中卫盆地内部有一些小震活动,但分布较分散,与大型弧形构造带无关,为局部调节作用,因此推断这条隐伏断层未来不具备发生破坏性地震的条件。
本文研究采用浅层地震勘探、钻孔联合剖面探测和样品年代测试相结合的方法,弥补了中卫盆地北缘隐伏断层研究程度低的不足,获得了隐伏断层的准确位置和活动性,主要结论如下:
1) 通过5条浅层地震勘探测线剖面的解释,给出了隐伏断层的平面展布、位置、性质、产状和上断点埋深等参数。
2) 通过钻孔联合剖面探测和样品年代测试结果,进一步精确定位了隐伏断层的位置和性质,确定了其活动性。结果表明,该隐伏断层最新活动时代为中更新世中晚期,晚更新世以来不活动,不属于活动断层。
3) 由于该隐伏断层规模小、晚更新世以来不活动,区域走滑变形主要集中在中卫盆地南侧规模大、晚更新世以来强烈活动的香山-天景山断裂,推断其未来不具备发生破坏性地震的条件。
  • 宁夏自然科学基金(2023AAC03815)
  • 2023年度自治区青年科技托举人才培养项目
  • 中卫市沙坡头区地震活断层探测与地震危险性评价项目
  • 活动断层与地震灾害研究创新团队(CX2023-03)
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2025年第45卷第2期
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doi: 10.14075/j.jgg.2024.04.152
  • 接收时间:2024-04-07
  • 首发时间:2026-10-30
  • 出版时间:2025-02-15
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  • 收稿日期:2024-04-07
基金
Natural Science Foundation of Ningxia(2023AAC03815)
宁夏自然科学基金(2023AAC03815)
Youth Talent Nurturing Program of Science and Technology in Autonomous Region, 2023
2023年度自治区青年科技托举人才培养项目
Project of Seismic Active Fault Detection and Seismic Hazard Assessment in Shapotou District, Zhongwei
中卫市沙坡头区地震活断层探测与地震危险性评价项目
Innovation Team of Researching Active Fault and Earthquake Hazard(CX2023-03)
活动断层与地震灾害研究创新团队(CX2023-03)
作者信息
    1 宁夏回族自治区地震局, 银川市北京东路244号, 750001
    2 中国地震局地球物理勘探中心, 郑州市文化路75号, 450002
    3 桂林理工大学地球科学学院, 桂林市雁山街319号, 541006
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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