Article(id=1322941184468976449, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1322940959071285581, articleNumber=null, orderNo=null, doi=10.14075/j.jgg.2024.07.337, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1720627200000, receivedDateStr=2024-07-11, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793343357435, onlineDateStr=2026-10-30, pubDate=1749916800000, pubDateStr=2025-06-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793343357435, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793343357435, creator=13701087609, updateTime=1793343357435, updator=13701087609, issue=Issue{id=1322940959071285581, tenantId=1146029695717560320, journalId=1281212831689347082, year='2025', volume='45', issue='6', pageStart='551', pageEnd='660', issueExtLink='null', onlineDate='null', pubDate='1749916800000', pubDateStr='2025-06-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793343303697, creator='13701087609', updateTime=1793343303697, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=633, endPage=639, ext={EN=ArticleExt(id=1322941186272527170, articleId=1322941184468976449, tenantId=1146029695717560320, journalId=1281212831689347082, language=EN, title=Post-Seismic InSAR Deformation and Mechanism of the Wenchuan M8.0 Earthquake, columnId=null, journalTitle=Journal of Geodesy and Geodynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=

We collect 243 descending-track Sentinel-1 SAR data covering the Longmenshan fault zone from October 2014 to April 2019 to obtain the post-seismic deformation of the Wenchuan M8.0 earthquake. Based on the co-seismic rupture model and regional layered media model, we conduct simulations of post-seismic viscoelastic relaxation and post-seismic afterslip inversion to estimate the relative contributions of the two mechanisms to post-seismic deformation. The results show that: 1)The post-seismic deformation on both sides of the Longmenshan fault zone exhibit distinct differences.The deformation in northwest side of the fault shows upward in LOS direction, with a maximum cumulative deformation of approximately 41.1 mm, located near Yingxiu. 2)The simulated values of viscoelastic relaxation cannot explain the actual post-seismic deformation observed by near-field InSAR. However, the deformation caused by viscoelastic relaxation in the middle-far-field region is consistent with the deformation observed by InSAR.3)Post-seismic afterslip mainly occurs in the vicinity of epicenter, primarily in areas where little or no slip occurred during the co-seismic. In conclusion, the post-seismic deformation mechanism of Wenchuan earthquake mainly involves afterslip and viscoelastic relaxation, the post-seismic afterslip dominated to the near-field deformation and viscoelastic relaxation contributed to the middle-far-field deformation.

, authors=Mengyuan CAO1, 2, Lingyun JI2, *, Xin LIAO1, 3, 4, Yanhui LIU2, Chuanjin LIU2, Yun SHI1, 3, Liangyu ZHU2, Guohua XIONG2, authorsList=Mengyuan CAO, Lingyun JI, Xin LIAO, Yanhui LIU, Chuanjin LIU, Yun SHI, Liangyu ZHU, Guohua XIONG, authorCompany=null, correspAuthors=Lingyun JI, authorNote=

CAO Mengyuan, postgraduate, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

, correspAuthorsNote=null, copyrightStatement=All rights reserved. Unauthorized reproduction is prohibited., 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=1322941188164158293, articleId=1322941184468976449, tenantId=1146029695717560320, journalId=1281212831689347082, language=CN, title=汶川8.0级地震震后InSAR形变及机制研究, columnId=1322506197874356701, journalTitle=大地测量与地球动力学, columnName=地壳运动, runingTitle=null, highlight=null, articleAbstract=

收集2014-10—2019-04覆盖龙门山断裂带的243景降轨Sentinel-1 SAR数据,获取汶川地震震后形变场,并基于同震破裂模型和区域介质分层模型开展震后黏弹性松弛模拟与震后余滑反演,估算黏弹性松弛和震后余滑对震后形变的相对贡献率,探讨汶川地震震后形变机理。结果表明:1)龙门山断裂带两侧震后形变明显不同,断裂带西北盘表现为LOS向隆升,最大累积形变量约为41.1 mm,位于映秀附近;2)黏弹性松弛模拟值无法解释近场InSAR观测的实际震后形变,但在中远场区域黏弹性松弛引起的形变与InSAR观测结果一致;3)震后断层余滑主要集中在震中邻近区域,且位于同震中未发生明显滑动或滑动较小的区域。本文认为,汶川地震震后形变机制主要包含震后余滑和震后黏弹性松弛,且近场形变以震后余滑为主,中远场形变基本由地壳黏弹性松弛贡献。

, authors=曹梦圆1, 2, 季灵运2, *, 廖欣1, 3, 4, 刘艳慧2, 刘传金2, 石云1, 3, 朱良玉2, 熊国华2, authorsList=曹梦圆, 季灵运, 廖欣, 刘艳慧, 刘传金, 石云, 朱良玉, 熊国华, authorCompany=null, correspAuthors=季灵运, authorNote=

曹梦圆,硕士生,主要从事InSAR形变监测与构造形变研究,E-mail:

, correspAuthorsNote=

季灵运,研究员,主要从事InSAR形变监测与构造形变研究,E-mail:

JI Lingyun, researcher, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

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CAO Mengyuan, postgraduate, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

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震源球A、B、C分别为200年汶川地震、2013年芦山地震和2017年九寨沟地震, 震源机制解来源于GCMT; 黑线表示区域断裂带, 红色实线表示汶川地震造成的地表破裂带分布

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震源球A、B、C分别为2008年汶川地震、2013年芦山地震和2017年九寨沟地震, 黑线为区域断裂带, 红线为汶川地震造成的地表破裂带分布, 橙色矩形框为统计数据标准差的选取范围

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Parameters of layered media of 3D viscoelastic model

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区域分层 厚度/km 密度/kg·m-3 VP/km·s-1 VS/km·s-1 黏滞系数/Pa·s
龙门山断裂带上盘 上地壳 0~5 2 528 5.144 2.970 ∞
5~15 2 657 5.789 3.342 ∞
15~25 2 728 6.094 3.518 ∞
25~30 2 736 6.122 3.534 ∞
下地壳 30~55 2 778 6.262 3.615 1.5×1018
上地幔 55~80 3 088 7.339 4.237 1.5×1019
龙门山断裂带下盘 上地壳 0~5 2 452 4.785 2.763 ∞
5~14 2 452 5.651 3.263 ∞
14~24 2 630 6.261 3.615 ∞
下地壳 24~34 2 778 6.442 3.708 ∞
34~44 2 826 6.686 3.860 ∞
上地幔 44~80 2 898 7.881 4.448 1.0×1020
), ArticleFig(id=1322941196435325868, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322941184468976449, language=CN, label=表1, caption=

三维黏弹模型分层介质参数

, figureFileSmall=null, figureFileBig=null, tableContent=
区域分层 厚度/km 密度/kg·m-3 VP/km·s-1 VS/km·s-1 黏滞系数/Pa·s
龙门山断裂带上盘 上地壳 0~5 2 528 5.144 2.970 ∞
5~15 2 657 5.789 3.342 ∞
15~25 2 728 6.094 3.518 ∞
25~30 2 736 6.122 3.534 ∞
下地壳 30~55 2 778 6.262 3.615 1.5×1018
上地幔 55~80 3 088 7.339 4.237 1.5×1019
龙门山断裂带下盘 上地壳 0~5 2 452 4.785 2.763 ∞
5~14 2 452 5.651 3.263 ∞
14~24 2 630 6.261 3.615 ∞
下地壳 24~34 2 778 6.442 3.708 ∞
34~44 2 826 6.686 3.860 ∞
上地幔 44~80 2 898 7.881 4.448 1.0×1020
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汶川8.0级地震震后InSAR形变及机制研究
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曹梦圆 1, 2 , 季灵运 2, * , 廖欣 1, 3, 4 , 刘艳慧 2 , 刘传金 2 , 石云 1, 3 , 朱良玉 2 , 熊国华 2
大地测量与地球动力学 | 地壳运动 2025,45(6): 633-639
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大地测量与地球动力学 |地壳运动 2025 , 45 (6) : 633 -639
汶川8.0级地震震后InSAR形变及机制研究
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曹梦圆1, 2 , 季灵运2, * , 廖欣1, 3, 4, 刘艳慧2, 刘传金2, 石云1, 3, 朱良玉2, 熊国华2
作者信息
  • 1 防灾科技学院, 河北省三河市学院街465号, 065201
  • 2 中国地震局第二监测中心, 西安市西影路316号, 710054
  • 3 河北省资源环境灾变机理及风险监控重点实验室, 河北省三河市学院街465号, 065201
  • 4 河北省地震动力学重点实验室, 河北省三河市学院街465号, 065201
通讯作者:

季灵运,研究员,主要从事InSAR形变监测与构造形变研究,E-mail:

JI Lingyun, researcher, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

作者简介:

曹梦圆,硕士生,主要从事InSAR形变监测与构造形变研究,E-mail:

Post-Seismic InSAR Deformation and Mechanism of the Wenchuan M8.0 Earthquake
Mengyuan CAO1, 2 , Lingyun JI2, * , Xin LIAO1, 3, 4, Yanhui LIU2, Chuanjin LIU2, Yun SHI1, 3, Liangyu ZHU2, Guohua XIONG2
Affiliations
  • 1 Institute of Disaster Prevention, 465 Xueyuan Street, Sanhe 065201, China
  • 2 The Second Monitoring and Application Center, CEA, 316 Xiying Road, Xi'an 710054, China
  • 3 Hebei Key Laboratory of Resource and Environmental Disaster Mechanism and Risk Monitoring, 465 Xueyuan Street, Sanhe 065201, China
  • 4 Hebei Key Laboratory of Earthquake Dynamics, 465 Xueyuan Street, Sanhe 065201, China
  • CAO Mengyuan, postgraduate, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

出版时间: 2025-06-15 doi: 10.14075/j.jgg.2024.07.337
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收集2014-10—2019-04覆盖龙门山断裂带的243景降轨Sentinel-1 SAR数据,获取汶川地震震后形变场,并基于同震破裂模型和区域介质分层模型开展震后黏弹性松弛模拟与震后余滑反演,估算黏弹性松弛和震后余滑对震后形变的相对贡献率,探讨汶川地震震后形变机理。结果表明:1)龙门山断裂带两侧震后形变明显不同,断裂带西北盘表现为LOS向隆升,最大累积形变量约为41.1 mm,位于映秀附近;2)黏弹性松弛模拟值无法解释近场InSAR观测的实际震后形变,但在中远场区域黏弹性松弛引起的形变与InSAR观测结果一致;3)震后断层余滑主要集中在震中邻近区域,且位于同震中未发生明显滑动或滑动较小的区域。本文认为,汶川地震震后形变机制主要包含震后余滑和震后黏弹性松弛,且近场形变以震后余滑为主,中远场形变基本由地壳黏弹性松弛贡献。

汶川地震  /  震后形变机制  /  黏弹性松弛  /  断层余滑  /  InSAR形变观测

We collect 243 descending-track Sentinel-1 SAR data covering the Longmenshan fault zone from October 2014 to April 2019 to obtain the post-seismic deformation of the Wenchuan M8.0 earthquake. Based on the co-seismic rupture model and regional layered media model, we conduct simulations of post-seismic viscoelastic relaxation and post-seismic afterslip inversion to estimate the relative contributions of the two mechanisms to post-seismic deformation. The results show that: 1)The post-seismic deformation on both sides of the Longmenshan fault zone exhibit distinct differences.The deformation in northwest side of the fault shows upward in LOS direction, with a maximum cumulative deformation of approximately 41.1 mm, located near Yingxiu. 2)The simulated values of viscoelastic relaxation cannot explain the actual post-seismic deformation observed by near-field InSAR. However, the deformation caused by viscoelastic relaxation in the middle-far-field region is consistent with the deformation observed by InSAR.3)Post-seismic afterslip mainly occurs in the vicinity of epicenter, primarily in areas where little or no slip occurred during the co-seismic. In conclusion, the post-seismic deformation mechanism of Wenchuan earthquake mainly involves afterslip and viscoelastic relaxation, the post-seismic afterslip dominated to the near-field deformation and viscoelastic relaxation contributed to the middle-far-field deformation.

Wenchuan earthquake  /  post-seismic deformation mechanism  /  viscoelastic relaxation  /  fault afterslip  /  InSAR deformation observations
曹梦圆, 季灵运, 廖欣, 刘艳慧, 刘传金, 石云, 朱良玉, 熊国华. 汶川8.0级地震震后InSAR形变及机制研究. 大地测量与地球动力学, 2025 , 45 (6) : 633 -639 . DOI: 10.14075/j.jgg.2024.07.337
Mengyuan CAO, Lingyun JI, Xin LIAO, Yanhui LIU, Chuanjin LIU, Yun SHI, Liangyu ZHU, Guohua XIONG. Post-Seismic InSAR Deformation and Mechanism of the Wenchuan M8.0 Earthquake[J]. Journal of Geodesy and Geodynamics, 2025 , 45 (6) : 633 -639 . DOI: 10.14075/j.jgg.2024.07.337
2008-05-12 14:28在青藏高原东缘和四川盆地交界处的龙门山逆冲推覆断裂带上发生汶川8.0级特大地震,对我国大陆造成永久性形变,震后影响也较为持久,导致周边部分断裂带上的库仑应力不断增加,发震危险性增大。
地质调查、地震监测等分析结果表明,汶川地震导致龙门山前山断裂带(灌县-江油断裂)和中央断裂带(映秀-北川-青川断裂)的地表发生破裂,震中位于中央断裂带西侧,震源深度为14~19 km,其地表破裂构造和运动性质均表现出分段特性。前山断裂带表现为纯逆冲性质,而中央断裂带则以逆冲挤压为主,并逐渐从映秀的逆冲性质过渡为青川的右旋走滑性质[1]。而后有部分学者利用震后2 a的GPS和InSAR数据研究震后形变,发现龙门山断裂带两侧的震后形变分布特征明显不同,引起震后位移的机制除了地壳黏弹性松弛之外,还包含震后余滑和孔隙弹性回弹等,且在汶川地震震后短期(1 a)形变中,震后余滑起主导作用,一般分布于断裂附近;而地壳黏弹性松弛的影响则较小[2],一般分布于中远场[3-4]。Wang等[5]使用震后9 a的GPS观测数据作为模型约束,进一步反演断层余滑和地壳黏弹性松弛引起的形变,发现断层余滑和地壳黏弹性松弛均存在,且震后余滑的作用在逐渐减弱。
在现有关于汶川地震震后形变方面的研究中,缺少对长时间震后InSAR形变信息的提取,且对于震后断层余滑和地壳黏弹性松弛引起的形变特征研究,大部分仅限于震后1~2 a内。本文采用InSAR技术获取震后形变,分析震后形变机理,定量阐明汶川地震震后6~11 a的地壳黏弹性松弛和断层余滑两种机制对地壳形变的相对贡献,为地震周期内强震导致的形变及应力的动力学模拟提供可靠的参数,并为青藏高原岩石圈地壳结构、流变参数等研究提供支持。
龙门山断裂带是松潘-甘孜块体和四川盆地的分界线,两侧地貌存在约5 000 m的高程差(图1),且岩石圈内部物质属性和结构差异显著,该断裂带包括前山断裂带(灌县-江油断裂)、中央断裂带(映秀-北川-青川断裂)、后山断裂带(汶川-茂汶断裂)3个主干断裂带(图2)。汶川地震震中位于中央断裂带上,坐标为31.01°N、103.38°E,震源深度15 km,地震沿断裂带破裂长度超过240 km,属逆冲为主兼右旋走滑型地震。在中央断裂带上,南段(映秀-北川段)以逆冲挤压为主,逐渐过渡到青川的右旋走滑性质,在震后发生30多次5级以上余震,并在2013-04-20发生芦山7.0级地震,表明该断裂带仍然较活跃。该地区地质环境独特、地形梯度大、应变积累率较高、岩石圈结构和动力学机制复杂。
本文围绕足够覆盖汶川地震震后形变的区域建立研究区,从欧空局收集2014-10—2019-04期间同一轨道3个相邻Frame共计243景标准图幅的降轨Sentinel-1A影像,获取汶川地震震后形变场,并采用GAMMA软件[6]进行InSAR数据处理。同时,采用欧空局公布的精密轨道数据,以消除干涉图中的轨道误差,采用30 m分辨率的地形数据(SRTM DEM)作为参考DEM,以模拟并去除地形相位。
利用GAMMA软件,基于SBAS-InSAR技术[7],在保证空间分辨率的基础上减少噪声的干扰,获取连续、面状的汶川地震震后形变监测结果。在进行干涉处理前,首先将243景标准图幅SLC影像拼接成81个长条带InSAR数据,避免因趋势项改正模型的不同而使同一轨道上相邻InSAR数据出现形变场的不连续。在处理过程中,为提高干涉图的相干性,避免因多视数过大产生DEM误差,进行2次多视处理,先使用小多视比(8×2)生成高分辨率差分干涉图,然后再对高分辨率差分干涉图进行多视处理(15×15)。为降低噪声并提高信噪比,对干涉图进行同质点滤波处理。根据相干性及改正后解缠图的标准差等判定标准,最终选择92个高质量的干涉对组合参与形变计算(图3),采用最小费用流方法进行相位解缠,剔除大部分失相干性影像,进一步提高干涉图的相干性[8]。另外,由于龙门山断裂带两侧地形差异较大,使用传统的地形相关大气模型容易导致过度估计大气相位。为克服该问题,使用欧洲中期天气预报中心(ECMWF)提供的ERA5气象再分析数据估计大气延迟相位。由于传统的多项式轨道模型难以有效分离在空间上均呈长波长特征的轨道误差和震后形变信号,本文利用研究区已有的GNSS研究成果[9-10]构建一个包含长波长震间形变的初始形变模型,从已扣除大气延迟的干涉图中移去初始形变模型相位,然后利用二次多项式模型和地形相关大气模型,估计并改正长波长轨道误差和残余大气延迟,最后将初始形变模型的相位重新添加到修正后的解缠图中,采用小基线InSAR算法获得覆盖整个汶川及邻近区域的长波长、mm级精度的震后形变场。
大震发生后,在震区及周围会观测到随时间呈指数或对数衰减的地表位移,即震后位移。引起震后位移的机制主要有孔隙回弹、断层余滑和地壳黏弹性松弛。震后孔隙回弹由地震导致流体流动所引发,通常发生在含有大量地下水的区域,在震后1 a左右即可恢复平衡位,因此在本文中可以忽略;而震后断层余滑通常持续数天、数月乃至数年,主要发生在发震断层的近场区域。相比之下,震后地壳黏弹性松弛对中远场区域的作用时间更久,可以长达数年甚至更久。
本文使用PSGRN/PSCMP程序[11]获取汶川地震因黏弹性层的应力松弛造成的震后形变,采用Wan等[12]的汶川同震破裂模型作为加载源。此外,相关研究表明,龙门山断裂带两侧壳幔介质属性存在明显差异,并会对震后形变场带来显著影响[13]。为此,在综合考虑前人研究成果后[5, 12],建立本文龙门山地区分层结构模型(图4),不仅在垂向上建立分层黏弹介质模型,而且在横向上对断裂带两侧使用不同的黏滞系数,并通过网格搜索方法对模型的最佳黏滞系数进行搜索,最终确定四川盆地和松潘-甘孜块体下地壳与上地幔的有效黏滞系数,具体参数见表1[12]。
本文采用最速下降法(SDM)[14]来获取汶川地震震后断层余滑所造成的地壳形变。根据震源机制可知,汶川地震以逆冲为主兼右旋走滑性质,故将断层滑动角设置为90°~135°。同时,为确保反演结果的稳定性,通过模型粗糙度与拟合残差的折中曲线,确定本文的最佳平滑因子α为0.08(图5)。
基于收集的降轨InSAR数据,在扣除2017年九寨沟地震同震及震后形变后,计算汶川地震震后(2014-10—2019-04)累积形变量(图6)。结果表明,在震后形变调整阶段,龙门山断裂带两侧的震后形变明显不同,形变场中正值表示地表朝向卫星移动,负值表示地表远离卫星移动。断裂带西北盘形变表现为LOS向隆升,形变量较大,最大累积形变量约为41.06 mm,位于映秀附近;断裂带东南盘形变表现为LOS向沉降,形变量较小,最大累积形变量约为27.49 mm。此外,2013-04龙门山断裂带南段发生芦山7.0级地震,在震后16个月,即本文研究期间,芦山地震震后形变表现为地表沉降,与汶川地震震后形变量级相比较小,且距汶川地震震中也有一定距离,因此不作深入研究。同时,选取远离形变中心的50 km×50 km矩形区域(图6),统计降轨数据在该区域的标准差,结果为1.57 mm,说明形变场结果可靠性较高。
利用PSGRN/PSCMP程序计算汶川地震地壳黏弹性松弛导致的震后(2014-10—2019-04)累积形变(图7)。可以看出,以龙门山断裂带为界,形变大多发生在断裂带上盘区域,断裂带下盘则较为稳定,无明显升降运动。在上盘区域,经向位移表现为东向运动,最大位移量为25.4 mm;纬向位移表现为北端以北向为主,最大位移量可达-22.9 mm,南端以南向为主,最大位移量可达14.7 mm;垂向位移在上盘近断层区域呈向上运动,最大幅度达到32.8 mm,在远离断层区域呈向下运动,最大幅度可达-18.5 mm,该形变特征与其他学者基于汶川地震震后GPS数据的研究结果相符[5]。而LOS向位移计算结果(图7(d))表明,在中远场区域,黏弹性松弛效应导致的形变与InSAR观测值接近,但在近场区域,模拟值却小于InSAR观测值,考虑到模拟误差,本文推测在汶川地震发震6 a后仍存在断层余滑作用。
本文在仅考虑断层余滑和地壳黏弹性松弛两种机制的影响下,从震后InSAR观测数据中扣除黏弹性松弛引起的形变后,认为剩余形变场完全由余滑作用引起。基于该观点,本文将剩余形变场作为约束,采用SDM方法反演得到模拟的地表震后余滑形变,结果见图8。由图可知,余滑最大形变量可达29.35 mm,主要表现在龙门山后山断裂带,位于汶川地震震中位置,残差在±5 mm之间,精度比较可靠。
对比余滑模拟值与实际观测数据可知,二者在断层近场区域基本完全拟合,中场区域的效果也较好,远场区域的拟合效果则相对较差,南侧的残差可能是因为鲜水河断裂带区域深部存在长期蠕滑作用,其流变介质属性也有较大差异,另一种可能则是由2013年芦山地震震后形变所致;而北侧残差则是由于研究期间发生九寨沟7.0级地震,从而出现拟合效果较差的情况。但两者对汶川地震震后形变的影响较小,且分布于较远的南北两侧,因此本文忽略其影响。
采用大地测量资料约束的汶川同震破裂模型[12](图9(a))显示,汶川地震发震断裂类型由西南端以逆冲为主向东北端以右旋为主转变,地表附近存在虹口、北川、平通、青川和南坝5个滑动高峰,其中最大的滑动高峰位于映秀至虹口的西南段,附近存在约8.4 m逆冲和5 m右旋滑动,断层大部分在地表附近出现滑动高峰,且其大部分滑动都发生在15 km深度以上区域。
基于SDM方法反演获得的2014-04—2019-10断层余滑结果(图9(b))显示,断层余滑在浅部和深部均存在。但整体而言,主要发生在15~30 km深度范围内,分布于同震中未发生明显滑动或滑动较小的区域,其中最大的3个滑动高峰位于清平深部、青川东北部和映秀西南深部,最大滑动量达到0.8 m,这些区域的逆冲趋势依然存在,导致深部仍发生余滑运动。总体而言,余滑形变继承了同震形变的性质特征,从西南部开始逆冲,逐渐过渡到东北部的纯走滑运动[1]。由于该断层倾角较大(图2),清平与映秀深部的断层逆冲滑动表现为在龙门山后山断裂带产生地表形变,位于汶川地震震中位置,这也与本文余滑地表拟合结果一致。
汶川地震震后InSAR数据表明,龙门山断裂带两侧的震后形变明显不同,具有逆断兼右旋走滑性质,且断层两侧上下盘的深部流变性质存在巨大差异,而造成断裂带两侧形变量产生差异的主要原因是断裂带两侧壳幔介质属性存在显著的横向差异,四川盆地岩石圈内部物质属性和结构均较为稳定。
在汶川地震震后6~11 a中,断层余滑导致的地表最大形变量可达29.35 mm,表现在震中,位于龙门山后山断裂带附近区域,余滑仍发生在中央断裂带;而地壳黏弹性松弛效应引起的地表位移量则达25.68 mm,主要位于映秀与虹口附近。在近断层区域,地壳黏弹性松弛效应与断层余滑引起的地表位移大体相当;而在远场区域,黏弹性松弛导致的地表位移与InSAR观测结果基本一致,此时InSAR观测的地表位移变化基本都是由地壳黏弹性松弛效应引起,断层余滑作用已基本消失。此外,在对研究期间的最佳黏滞系数进行搜索时发现,随着黏滞系数的增大(从6×1018 Pa ·s到5×1019 Pa ·s),模拟的震后形变量减小(从41.9 mm到15.91 mm),这也说明在汶川地震震后6~11 a的形变中,黏弹性松弛效应起到至关重要的作用。
地震发生后,断层开始余滑,由汶川地震同震破裂模型得到断层15 km以上深度破裂释放的地震矩为8.2×1021 Nm,相当于MW7.9地震,局部滑动主要集中在虹口、北川、平通、青川和南坝附近,这些区域的同震库仑应力发生显著变化,其中大部分会驱动断层滑动,并在短时间内较快释放,还有一部分应力则加载到周围区域。随着时间的演化,震后断层余滑破裂主要集中在15~30 km深度范围内,表明其浅部应力已基本释放完,其中青川段东北侧从浅部延伸到深部,北川段与映秀段则向周围扩散,由近地表逐渐向下延伸至清平段与映秀段深部,并在不断释放应力,导致映秀地表发生位移变化。
本文利用汶川地震震后(2014-10—2019-04)覆盖龙门山断裂带及周边区域的降轨InSAR形变资料及同震破裂模型和区域介质分层模型对汶川地震震后形变进行分析,得到以下结论:
1) 龙门山断裂带两侧的震后形变具有明显的不对称性,断裂带西北盘形变表现为LOS向隆升,最大累积形变量约为41.1 mm,位于映秀附近;断裂带东南盘形变表现为LOS向沉降,形变量较小,最大累积形变量约为17.7 mm;下盘形变量明显小于上盘,表明断层两侧的深部流变性质存在巨大差异,且该断裂带具有逆断兼右旋走滑活动特征。
2) 考虑震后黏弹性松弛发现,随着松潘-甘孜块体下地壳黏度系数的增大(从6×1018 Pa ·s到5×1019 Pa ·s),模拟的震后形变量减小(从41.9 mm到15.91 mm),说明在汶川地震震后6~11 a的形变中,黏弹性松弛效应起至关重要的作用,并最终确定松潘-甘孜块体的下地壳和上地幔黏滞系数分别为1.5×1018 Pa ·s和1.5×1019 Pa ·s。
3) 黏弹性松弛效应无法完全解释汶川地震震后6~11 a的形变,龙门山断裂带的断层余滑及其对地壳形变的影响仍然存在,具体表现为:在近场区域,断层余滑对地壳形变的贡献率略高于黏弹性松弛效应,约占53%;而在中远场区域,黏弹性松弛效应对地壳形变的贡献率在90%以上,地壳黏弹性松弛和断层余滑的双机制可以更有效地解释震后形变特征。
4) 汶川地震震后断层余滑的浅部应力已基本释放完,并从映秀的逆冲性质逐渐过渡到青川的右旋走滑性质,青川段东北侧从浅部延伸到深部,北川段与映秀段则向周围扩散,由近地表逐渐向下延伸至清平段与映秀段深部,并在不断释放应力,导致映秀地表发生位移变化。
  • 国家重点研发计划(2023YFC3007303)
  • 中央高校基本科研业务费专项(ZY20240304)
  • 中国地震局地震科技星火计划(XH23063A)
  • 河北省地震动力学重点实验室开放基金(FZ246105)
  • 国家自然科学基金(41602274)
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doi: 10.14075/j.jgg.2024.07.337
  • 接收时间:2024-07-11
  • 首发时间:2026-10-30
  • 出版时间:2025-06-15
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  • 收稿日期:2024-07-11
基金
National Key Research and Development Program of China(2023YFC3007303)
国家重点研发计划(2023YFC3007303)
Fundamental Research Funds for the Central Universities(ZY20240304)
中央高校基本科研业务费专项(ZY20240304)
The Spark Program of Earthquake Technology of CEA(XH23063A)
中国地震局地震科技星火计划(XH23063A)
Open Fund of Hebei Key Laboratory of Earthquake Dynamics(FZ246105)
河北省地震动力学重点实验室开放基金(FZ246105)
National Natural Science Foundation of China(41602274)
国家自然科学基金(41602274)
作者信息
    1 防灾科技学院, 河北省三河市学院街465号, 065201
    2 中国地震局第二监测中心, 西安市西影路316号, 710054
    3 河北省资源环境灾变机理及风险监控重点实验室, 河北省三河市学院街465号, 065201
    4 河北省地震动力学重点实验室, 河北省三河市学院街465号, 065201

通讯作者:

季灵运,研究员,主要从事InSAR形变监测与构造形变研究,E-mail:

JI Lingyun, researcher, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

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https://castjournals.cast.org.cn/joweb/ddcl/CN/10.14075/j.jgg.2024.07.337
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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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