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汶川Ms8.0地震后龙门山断裂带地壳应力场及其构造意义

丰成君 戚帮申 张鹏 孙东生 孟静 牛琳琳 王苗苗 谭成轩 陈群策

丰成君, 戚帮申, 张鹏, 等, 2018. 汶川Ms8.0地震后龙门山断裂带地壳应力场及其构造意义. 地质力学学报, 24 (4): 439-451. DOI: 10.12090/j.issn.1006-6616.2018.24.04.046
引用本文: 丰成君, 戚帮申, 张鹏, 等, 2018. 汶川Ms8.0地震后龙门山断裂带地壳应力场及其构造意义. 地质力学学报, 24 (4): 439-451. DOI: 10.12090/j.issn.1006-6616.2018.24.04.046
FENG Chengjun, QI Bangshen, ZHANG Peng, et al., 2018. CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN Ms8.0 EARTHQUAKE. Journal of Geomechanics, 24 (4): 439-451. DOI: 10.12090/j.issn.1006-6616.2018.24.04.046
Citation: FENG Chengjun, QI Bangshen, ZHANG Peng, et al., 2018. CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN Ms8.0 EARTHQUAKE. Journal of Geomechanics, 24 (4): 439-451. DOI: 10.12090/j.issn.1006-6616.2018.24.04.046

汶川Ms8.0地震后龙门山断裂带地壳应力场及其构造意义

doi: 10.12090/j.issn.1006-6616.2018.24.04.046
基金项目: 

国家自然科学基金 41702341

详细信息
    作者简介:

    丰成君(1985-), 男, 高级工程师, 博士, 主要从事地应力测量与监测、构造应力场数值模拟与分析、活动断裂调查与评价等工作。E-mail:feng2010618@aliyun.com

  • 中图分类号: P553;P315.3

CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN Ms8.0 EARTHQUAKE

  • 摘要: 2008年5月12日在青藏高原东缘龙门山断裂带中段发生汶川8.0级特大地震。大震发生时释放应力并对震源区及外围构造应力场产生影响,受汶川地震断层破裂方式和强度空间差异性的影响,震后龙门山断裂带地壳应力场也应表现差异特征,至今鲜有针对该科学问题深入的分析和讨论。经过系统收集、梳理汶川地震后沿龙门山断裂带水压致裂地应力测量数据与2008年汶川地震中强余震序列震源机制解资料,对汶川地震后龙门山断裂带中上地壳构造应力场进行厘定,通过与震前构造应力场对比,深入探讨了汶川8.0级地震对龙门山断裂带地壳应力场的影响,进而对汶川震后应力调整过程及青藏高原东缘龙门山地区深部构造变形模式进行研究,研究结果表明:受汶川8.0级地震的影响,震后龙门山断裂带地壳构造应力场空间分布具有差异性,近地表至上地壳15 km深度范围,映秀-青川段最大主应力方向为北西西向、地应力状态为逆走滑型,青川东北部最大主应力方向偏转至北东东向、应力状态转变为走滑型;15~25 km深度范围,龙门山断裂带最大主应力方向仍为北西-北西西向、应力状态以逆冲型为主。汶川8.0级地震后,龙门山断裂带中地壳北西西向逆冲挤压的构造应力特征进一步支持了青藏高原东缘龙门山地区东西两侧刚性块体碰撞挤压、逆冲推覆的动力学模式。

     

  • 图  1  2008年汶川Ms8.0地震发震构造及M4.0及以上余震分布

    龙门山断裂带:F1-1耿达-陇东断裂;F1-2茂县-汶川断裂;F1-3平武-青川断裂;F2-1盐井-五龙断裂;F2-2北川-映秀断裂;F2-3茶坝-林庵寺断裂;F3-1大川-双石断裂;F3-2灌县-江油断裂;F3-3江油-广元断裂;F4熊坡断裂;F5龙泉山断裂;F6鲜水河断裂带;F7龙日坝断裂;F8岷江断裂;F9虎牙断裂;F10塔藏断裂。

    Figure  1.  Seismogenic structures and aftershocks distribution with M≥4.0 of Wenchuan Ms8.0 earthquake in 2008

    图  2  2008年5月12日汶川8.0级地震前后龙门山断裂带地壳浅表层最大主应力方向变化

    (基于水压致裂地应力测量数据绘制)

    Figure  2.  Changes in orientations of near-surface maximum principal stress before and after Wenchuan 8.0 earthquake on May 12, 2008

    (Based on the hydraulic fracturing in situ stress measurements)

    图  3  2008年5月12日汶川8.0级地震后龙门山断裂带上地壳(5~10 km)构造应力场

    (基于震源机制解绘制)

    Figure  3.  Upper crustal tectonic stress filed at the depth of 5~10 km after Wenchuan 8.0 earthquake on May 12, 2008

    (Based on the focal mechanism solutions)

    图  4  2008年5月12日汶川8.0级地震后龙门山断裂带上地壳(10~15 km)构造应力场

    (基于震源机制解绘制)

    Figure  4.  Upper crustal tectonic stress filed at the depth of 10~15 km after Wenchuan 8.0 earthquake of May 12, 2008

    (Based on the focal mechanism solutions)

    图  5  2008年5月12日汶川8.0级地震后龙门山断裂带中地壳(15~20 km)构造应力场

    (基于震源机制解绘制)

    Figure  5.  Middle crustal tectonic stress filed at the depth of 15~20 km after Wenchuan 8.0 earthquake of May 12, 2008

    (Based on the focal mechanism solutions)

    图  6  2008年5月12日汶川8.0级地震后龙门山断裂带中地壳(20~25 km)构造应力场

    (基于震源机制解绘制)

    Figure  6.  Middle crustal tectonic stress filed at the depth of 20~25 km after Wenchuan 8.0 earthquake of May 12, 2008

    (Based on the focal mechanism solutions)

    图  7  龙门山地区下地壳“管道流”构造变形概念模型

    (据文献[56]~[57]修绘)

    Figure  7.  Conceptual model for conduit flow tectonic deformation explaining LMS formation produced by lower crustal channel

    (modified after [56]~[57])

    图  8  龙门山地区中上地壳刚性碰撞构造变形概念模型

    (据文献[63]修绘)

    Figure  8.  Conceptual structural tectonics model for explaining LMS formation produced by middle-upper crustal rigid collisions

    (modified after [63])

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  • 收稿日期:  2018-03-20
  • 修回日期:  2018-05-28
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