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GPS资料在2015尼泊尔Mw7.8级地震中的反演应用

徐锐 张锐 廖华 顾铁 陈聪

徐锐, 张锐, 廖华, 顾铁, 陈聪. GPS资料在2015尼泊尔Mw7.8级地震中的反演应用[J]. 西南交通大学学报, 2019, 54(2): 287-295. doi: 10.3969/j.issn.0258-2724.20160860
引用本文: 徐锐, 张锐, 廖华, 顾铁, 陈聪. GPS资料在2015尼泊尔Mw7.8级地震中的反演应用[J]. 西南交通大学学报, 2019, 54(2): 287-295. doi: 10.3969/j.issn.0258-2724.20160860
XU Rui, ZHANG Rui, LIAO Hua, GU Tie, CHEN Cong. Preliminary Investigation into Inversion of 2015 Mw7.8 Nepal Earthquake Based on GPS Data[J]. Journal of Southwest Jiaotong University, 2019, 54(2): 287-295. doi: 10.3969/j.issn.0258-2724.20160860
Citation: XU Rui, ZHANG Rui, LIAO Hua, GU Tie, CHEN Cong. Preliminary Investigation into Inversion of 2015 Mw7.8 Nepal Earthquake Based on GPS Data[J]. Journal of Southwest Jiaotong University, 2019, 54(2): 287-295. doi: 10.3969/j.issn.0258-2724.20160860

GPS资料在2015尼泊尔Mw7.8级地震中的反演应用

doi: 10.3969/j.issn.0258-2724.20160860
基金项目: 国家自然科学基金资助项目(41631073)
详细信息
    作者简介:

    徐锐(1982—),男,副研究员,博士,研究方向为GPS地壳运动监测及地震大地测量学,E-mail:xurui_3@163.com

  • 中图分类号: V221.3

Preliminary Investigation into Inversion of 2015 Mw7.8 Nepal Earthquake Based on GPS Data

  • 摘要: 为了探索近场高频GPS资料在重特大地震实时发震特征反演方面的潜在作用和优势,独立使用2015年尼泊尔Mw7.8级地震震中附近的16个高频(1 Hz)GPS站点数据,基于动态数据处理技术、矩张量反演技术及跟踪方差技术,模拟实现了对该次地震的触发、实时矩心/矩张量的反演及地震事件结束判断等相关工作;结合GCMT、W-相位以及部分已公开发表成果,对反演过程及反演结果中存在的问题进行了对比分析;初步探讨了GPS同震位移场产品在节面判定中的潜在补充作用. 研究结果表明:本次地震破裂的传播方向主要为自西向东南单侧传播,平均传播速度约为3.1 km/s,地震持续时间至少为75 s;GPS数据反演得到的实时矩心及矩震级结果与GCMT、W-相位结果一致,且反演序列具有较高的稳定性和可靠性.

     

  • 图 1  GPS点位及同震位移分布

    Figure 1.  Distribution map of the utilized GPS sites and their corresponding co-seismic slip

    图 2  GPS站点(1 Hz)坐标时间序列(起止时间为GPS时间06:10:00 — 06:16:00)

    Figure 2.  Coordinate time series of GPS (1 Hz) stations (from 06:10:00 to 06:16:00,GPS time)

    图 3  基于GPS技术反演得到的矩心经度、纬度、深度、矩震级及方差缩减量序列

    Figure 3.  GPS-derived centroid longitude,latitude,and depth,moment magnitude,and variance reduction

    图 4  基于跟踪方差技术探测地震事件结束及获取GPS同震位移

    Figure 4.  Trailing variance technique-based seismic event ending detection and the calculation of co-seismic GPS displacement

    图 5  震源机制节面解及其与GCMT(绿色虚线)、W-相位结果(绿色实线)的比较

    Figure 5.  Nodal plane solutions of focal mechanism and comparisons with GCMT (dashed green line) and W-phase (solid green line) results

    图 6  KKN4站点删除后,得到的震源机制节面解的几何参数及与GCMT(绿色虚线)、W-相位结果(绿色实线)的比较

    Figure 6.  Nodal plane solutions of focal mechanism with the GPS site KKN4 excluded,and comparisons with GCMT (dashed green line) and W-phase (solid green line) results

    图 7  基于GPS位移时间序列获取的同震位移等值线序列(06:12:00 — 06:12:19)

    Figure 7.  Snapshots of the co-seismic displacement contour derived from GPS raw time series (06:12:00 — 06:12:19)

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出版历程
  • 收稿日期:  2016-10-25
  • 修回日期:  2017-04-14
  • 网络出版日期:  2017-09-27
  • 刊出日期:  2019-04-01

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