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基于复合方法的天水盆地宽频带地震动模拟

付长华 吴健 郭祥云 胡刚 王涛 刘甲美

付长华, 吴健, 郭祥云, 等, 2017. 基于复合方法的天水盆地宽频带地震动模拟. 地质力学学报, 23 (6): 882-892.
引用本文: 付长华, 吴健, 郭祥云, 等, 2017. 基于复合方法的天水盆地宽频带地震动模拟. 地质力学学报, 23 (6): 882-892.
FU Changhua, WU Jian, GUO Xiangyun, et al., 2017. BROADBAND GROUND MOTION SIMULATION IN TIANSHUI BASIN BASED ON A HYBRID METHOD. Journal of Geomechanics, 23 (6): 882-892.
Citation: FU Changhua, WU Jian, GUO Xiangyun, et al., 2017. BROADBAND GROUND MOTION SIMULATION IN TIANSHUI BASIN BASED ON A HYBRID METHOD. Journal of Geomechanics, 23 (6): 882-892.

基于复合方法的天水盆地宽频带地震动模拟

基金项目: 

国家重点研发计划课题 2017YFC0404901

中央级公益性科研院所基本科研业务费专项 DQJB16A02

地质调查项目 DD20160271

国家自然科学基金项目 41572313

详细信息
    作者简介:

    付长华(1978-), 男, 博士, 助理研究员, 主要从事强地面运动与地震动数值模拟方面的研究工作。E-mail:fuchanghua2004@163.com

  • 中图分类号: P315.8

BROADBAND GROUND MOTION SIMULATION IN TIANSHUI BASIN BASED ON A HYBRID METHOD

  • 摘要: 本文采用有限差分和随机振动合成结合的复合方法,模拟了当礼县—罗家堡断裂发生矩震级Mw7.7级大地震时,在天水盆地产生的宽频带地震动场,分析了在设定地震条件下盆地内的地震动分布特征,为该区黄土地震滑坡分析提供了地震动参数结果。结果显示:(1)有限差分法和随机振动合成法可以很好地互补,得到盆地内地表宽频带地震动;(2)地震在盆地区域产生了强烈地震动,PGA(峰值加速度)介于150~900 gal,离断层较近的区域东南角的PGA最大,随着断层距的增加,PGA逐渐减小。河谷南侧的PGA值相比北侧较大,具备诱发滑坡的强大动力条件;(3)盆地区域PGV(峰值速度)最大为120 cm/s。受第四系覆盖层放大效应和地形放大效应共同影响,水平向地震动在盆地区域东侧和中部具有较大PGV,而西侧PGV相对较小。竖向地震动在盆地区域东侧较弱,而在中部和西侧较强,特别是最西侧陡峭的山坡上,PGV达到了最大值。此外,竖向地震动明显受到覆盖层厚度的影响,譬如在盆地区域南侧的中间部位,也具有较大的PGV。

     

  • 图  1  天水盆地及周边地区地震构造背景

    ①—六盘山东麓断裂;②—清水河断裂;③—西秦岭北缘断裂;④—礼县-罗家堡断裂;⑤—通渭断裂  Ⅰ—龙门山地震带;Ⅱ—六盘山-祁连山地震带;Ⅲ—鄂尔多斯地震带;Ⅳ—长江中游地震带

    Figure  1.  Seismotectonic background in Tianshui basin and its adjacent areas

    图  2  天水盆地区域地形图

    Figure  2.  Topography of Tianshui basin

    图  3  天水盆地第四系覆盖层等厚线图

    Figure  3.  Isopach of Quaternary covering layer in Tianshui basin

    图  4  断层面上滑动量分布及初始破裂点位置

    Figure  4.  Slip distribution on the fault plane and location of the initial rupture point

    图  5  A、B、C、D四点的地震动加速度时程

    Figure  5.  Ground motion acceleration histories of station A, B, C and D

    图  6  A、B、C、D四点加速度傅立叶谱

    Figure  6.  Fourier spectra of station A, B, C and D

    图  7  天水盆地内PGA分布

    a-东西向  b-南北向

    Figure  7.  Distribution of peak ground acceleration in Tianshui basin

    图  8  天水盆地区域内PGV分布

    a-东西向  b-西向  c-竖向

    Figure  8.  Distribution of peak ground velocity in Tianshui basin

    表  1  天水盆地地下介质的计算参数

    Table  1.   Calculation parameters of underground media in Tianshui basin

    介质层 第四系覆盖层 沉积层 上地壳 中地壳 下地壳
    介质密度/g·cm-3 2.00 2.25~2.65 2.80 2.90 3.00
    纵波速度/km·s-1 2.0 3.0~5.8 5.9~6.5 6.6~7.0 7.0~7.2
    横波速度/km·s-1 1.0 1.5~3.3 3.4~3.8 3.8~4.1 4.1~4.2
    介质品质因子 100 150~330 340~380 380~410 410~420
    层介质埋深/km 0~0.09 0~6.5 6.5~24 24~38 38~40
    下载: 导出CSV
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