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玉溪盆地三维速度结构建模

张振, 陈学良, 高孟潭, 李铁飞, 鞠永伟

张振, 陈学良, 高孟潭, 李铁飞, 鞠永伟. 2017: 玉溪盆地三维速度结构建模. 地震学报, 39(6): 930-940. DOI: 10.11939/jass.2017.06.011
引用本文: 张振, 陈学良, 高孟潭, 李铁飞, 鞠永伟. 2017: 玉溪盆地三维速度结构建模. 地震学报, 39(6): 930-940. DOI: 10.11939/jass.2017.06.011
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Zhang Zhen, Chen Xueliang, Gao Mengtan, Li Tiefei, Ju Yongwei. 2017: 3-D modeling of velocity structure for the Yuxi basin. Acta Seismologica Sinica, 39(6): 930-940. DOI: 10.11939/jass.2017.06.011
Citation: Zhang Zhen, Chen Xueliang, Gao Mengtan, Li Tiefei, Ju Yongwei. 2017: 3-D modeling of velocity structure for the Yuxi basin. Acta Seismologica Sinica, 39(6): 930-940. DOI: 10.11939/jass.2017.06.011
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玉溪盆地三维速度结构建模

  • 1.

    中国北京 100081 中国地震局地球物理研究所

  • 2.

    中国北京 100083 中国矿业大学(北京)力学与建筑工程学院

基金项目: 

国家自然科学基金 51278470

国家自然科学基金 51678537

国家公益性行业专项 201408002

国家科技支撑计划 2012BAK15B01

国家自然科学基金(51278470，51678537)、国家公益性行业专项(201408002)和国家科技支撑计划(2012BAK15B01)联合资助

详细信息
    作者简介:

    张振  中国地震局地球物理研究所岩土工程专业在读硕士研究生. 2015年鲁东大学土木工程学院土木工程专业毕业，获工学学士学位.现主要从事浅层地表的三维速度结构建模及可视化、长周期地震动的模拟以及地震动三维可视化展示方面的研究

    通讯作者:

    陈学良, e-mail: chenxl@cea-igp.ac.cn

  • 中图分类号: P315.9

3-D modeling of velocity structure for the Yuxi basin

  • 1.

    Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

  • 2.

    School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, Beijing 100083, China

摘要

    摘要
  • 摘要: 本文以玉溪盆地为例，提出了一种包含数据预处理、模型建立、模型修正和模型检验的建模方法.基于各类数据间不同的可信度，给出了消除各类数据间速度偏差的折减函数.为避免以往模型修正过程中对地震波形数据的依赖以及对地脉动H/V谱进行模拟等复杂问题，本文提出了一种改进的模型修正方法，即根据基阶瑞雷波H/V谱与实测地脉动H/V谱形状变化相似的原则，对模型进行修正.修正依据为：在玉溪盆地中，单个地脉动测点所在位置处的地下速度结构中各沉积层面的深度均增加约15 m时，由该点的地下速度结构得到的基阶瑞雷波H/V谱的波峰周期和波谷周期均增加约0.1 s，且二者分别由盆地内沉积层的深层和浅层的速度结构所控制.由于地脉动数据的获取较方便，因此该模型修正方法具有广泛的适用性，由该方法修正后的玉溪盆地三维速度结构模型经检验具有较高的准确度.
    Abstract: To achieve ground motion prediction, it is necessary to build a 3-D velocity structure model of sedimentary basin. Taking the Yuxi basin as an example, we provide a modeling procedure, including data preprocessing, model building, model updating and model testing. Based on the different credibility of various data, we propose a function that can eliminate the velocity deviation among various data. In this paper, an improved model updating method is proposed in order to avoid the dependence on the seismic waveform data and the simulation of the microtremors spectral ratio of horizontal to vertical component (H/V spectra). We apply the theory that the H/V spectral shape of the fundamental-mode Rayleigh, including its peak and trough periods, is similar to that of the microtremors to update the 3-D velocity structure model. When the depth of each sedimentary layer in the velocity structure under a single microtremors measuring point is increased by about 15 m, the H/V spectral peak and trough periods of the fundamental-mode Rayleigh wave will both increase about 0.1 s, moreover, the two periods are controlled by deep or shallow velocity structures of the sedimentary layers in basin respectively. Because of the convenient acquisition of the microtremors data, the model updating method has extensive applicability. The 3-D velocity structure model of the Yuxi basin modified by the model updating method has been confirmed a high accuracy after inspection.
    • HTML全文
  • 中国地震局地球物理研究所鲁来玉研究员和陈石研究员分别在面波频散曲线计算和速度结构模型三维可视化展示方面给予了指导，中央级公益性科研院所业务专项(021904)提供了本文所用玉溪盆地的建模数据，作者在此一并表示感谢.

  • 图  1   玉溪盆地资料

    Figure  1.   Information of the Yuxi basin

    下载: 全尺寸图片 幻灯片

    图  2   地震勘探数据与钻孔数据之间的速度偏差dv (黑色圆点)随深度x的变化曲线

    Figure  2.   Curve of velocity deviation dv of seismic exploration data from borehole data versus depth x

    下载: 全尺寸图片 幻灯片

    图  3   模型修正前(a)、后(b)本文示例中地脉动测点所在场地的地脉动H/V谱(H/V)m(实线)和基阶瑞雷波H/V谱(H/V)R0(虚线)

    Figure  3.   The H/V spectra of microtremors (H/V)m (solid lines) and those of fundamental-mode Rayleigh (H/V)R0 (dashed lines) at the site used for exmaple before (a) and after (b) model updating

    下载: 全尺寸图片 幻灯片

    图  4   场地A-F的地脉动H/V谱(H/V)m(实线)和基阶瑞雷波H/V谱(H/V)R0(虚线)

    Figure  4.   The H/V spectra of microtremors (H/V)m (solid lines) and those of fundamental-mode Rayleigh (H/V)R0 (dashed lines) at sites A-F

    下载: 全尺寸图片 幻灯片

    图  5   玉溪盆地三维速度结构. x轴为经度方向，y轴为纬度方向，z轴为深度方向

    Figure  5.   The 3-D velocity structures of the Yuxi basin

    x-axis is the longitude direction, y-axis is the latitude direction, and z-axis is the depth direction

    下载: 全尺寸图片 幻灯片
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    12. 冯梅，张纪中，安美建. 2008年汶川地震前后震源区构造应力场变化. 地震地质. 2013(04): 701-720 . 百度学术

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  • 收稿日期:  2017-02-06
  • 修回日期:  2017-04-25
  • 发布日期:  2017-10-31

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