[1]刘 潇.小波多尺度分析尼泊尔MW 7.8地震前卫星重力变化[J].华南地震,2021,41(01):73-77.[doi:10.13512/j.hndz.2021.01.10]
 LIU Xiao.Wavelet Multi Scale Analysis of Satellite Gravity Changes before Nepal MW7.8 Earthquake[J].,2021,41(01):73-77.[doi:10.13512/j.hndz.2021.01.10]
点击复制

小波多尺度分析尼泊尔MW 7.8地震前卫星重力变化()
分享到:

华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
41
期数:
2021年01期
页码:
73-77
栏目:
地震科学研究
出版日期:
2021-03-20

文章信息/Info

Title:
Wavelet Multi Scale Analysis of Satellite Gravity Changes before Nepal MW7.8 Earthquake
文章编号:
1001-8662(2021)01-0073-05
作者:
刘 潇
中铁第四勘察设计院集团有限公司,武汉 430063
Author(s):
LIU Xiao
China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China
关键词:
GRACE卫星重力重力变化尼泊尔地震时间序列小波多尺度分解
Keywords:
GRACE satellite gravityThe gravity changeNepal earthquakeTime seriesThe wavelet multi-scale decomposition
分类号:
P315.726
DOI:
10.13512/j.hndz.2021.01.10
文献标志码:
A
摘要:
利用GRACE重力卫星RL05月重力场数据,获取尼泊尔大地震前后震源区周缘2010—2015年每月重力变化,以及震中点位重力时间序列。基于小波多尺度分析方法对卫星重力场进行分解,获得重力场细节和近似部分。研究结果表明:尼泊尔地震前5年(2010—2014)内在震源区周边出现了比较明显的卫星重力异常正负交替和迁移现象,2014至2015年间,震区周边形成了明显正负异常区,正重力异常区重力增加现象明显。震中重力时间序列反映从2013年开始,重力变化处于稳定状态,且处在较高位;通过功率谱分析,计算多尺度分解各阶细节对应的场源深度,前4阶小波分解后的重力异常细节,反映了浅部地质体的位置和异常情形;5阶小波细节更加侧重于刻画地区构造形变和深部物质流动引起的重力变化。
Abstract:
The monthly gravity field data of GRACE gravity satellite RL05 was used to obtain the monthly gravity changes of the periphery of the epicenter of the Nepal earthquake from 2010 to 2015 and the gravity time series of the epicenter. Based on the wavelet multi-scale analysis method,the satellite gravity field is decomposed to obtain the details and approximate parts of the gravity field. The results of the study show that in the 5 years before the Nepal earthquake(2010-2014),there were obvious positive and negative satellite gravity anomalies and migration around the source area. From 2014 and 2015,obvious positive and negative anomalies were formed around the earthquake area. The gravity increase in the gravity anomaly area is obvious. The epicenter's gravity time series reflects that since 2013,the gravity change is in a stable state and at a high level;through power spectrum analysis,the depth of the field source corresponding to each order of multi-scale decomposition is calculated,and the details of gravity anomalies after the first 4 order wavelet decomposition,which reflects the location and anomalies of shallow geological bodies;the details of the 5th-order wavelet are more focused on describing regional structural deformation and gravity changes caused by deep material flow.

参考文献/References:

[1] 张国民. 地震预报引论[M]. 北京:科学出版社,2001.
[2] 孙文科. 2011年日本大地震的科学解读[J]. 中国科技教育,2011(18):57-60.
[3] 邹正波,罗志才,吴海波,等. 日本MW9.0地震前GRACE卫星重力变化[J]. 测绘学报,2012(2):171-176.
[4] 王武星,石耀霖,顾国华,等. GRACE卫星观测到的与汶川MS8.0地震有关的重力变化[J]. 地球物理学报,2010,53(8):1767-1777.
[5] 汪海洪. 小波多尺度分析在地球重力场中的应用研究[D]. 武汉:武汉大学,2005.
[6] Wahr,J.,M. Molenaar,F. Bryan. Time variability of the earth's gravity field:hydrological and oceanic effects and their possible detection using GRACE[J]. Journal of Geophysical Research:Solid Earth(1978-2012),1998,103(B12):30205-30229.
[7] 赵鹏志. 多尺度分析理论在重力异常分离中的应用[D]. 北京:中国地质大学(北京),2014.;[8] J.morlet,G..arens,I.fourgeau,et al. Wave propagation and sampling theory[J]. Geoplysics,1982(47):203-236
[9] Mallat s. A theory for multiresolution signal decomposition: the wavelet representation[J]. Pattern analysis and machine intelligence,ieee transactions,1989,11(7):674-693.
[10] Torrence C,Compo G P. A Practical Guide to Wavelet Analysis[J]. Bulletin of the American Meteorological Society,1998,79(1):61-78.
[11] Sean,Swenson. Estimating geocenter variations from a combination of GRACE and ocean model output [J]. Journal of Geophysical Research: Solid Earth(1978–2012),2008,113(B8),DOI:10.1029/2007JB005338.
[12] Cheng M., B. D. Tapley. Variations in the Earth’s oblateness during the past 28 years [J]. J. Geophys. Res,2004,109,B09402,doi:10.1029/2004JB003028.
[13] Duan,X.J., Guo J Y, Shum C K, et al. On the postprocessing removal of correlated errors in GRACE temporal gravity field solutions[J]. Journal of Geodesy,2009,83(11): 1095-1106.
[14] Koji M,Kosuke H. Coseismic gravity changes of the 2011 Tohoku-Oki Earthquake from satellite gravimetry[J]. Geophysical Research Letters,2011,38(7):113-120.
[15] 刁博,王家林,程顺有. 重力异常小波多分辨分析分解阶次的确定[J]. 地球科学:中国地质大学学报,2007,32(4):564-568.;[16] 陈国雄,孙劲松,刘天佑. GRACE卫星时变重力场的小波多尺度分解——以2008年汶川MS8.0大地震为例 [J]. 武汉大学学报:信息科学版, 2012,37(6):679-682.

相似文献/References:

[1]刘洪良,王青华,张展伟,等.河北唐山古冶5.1级地震前的重力变化[J].华南地震,2021,41(02):71.[doi:10.13512/j.hndz.2021.02.10 ]
 LIU Hongliang,WANG Qinghua*,ZHANG Zhanwei,et al.Gravity Changes before the Guye MS5.1 Earthquake in Tangshan,Hebei Province[J].,2021,41(01):71.[doi:10.13512/j.hndz.2021.02.10 ]
[2]杨雅慧,刘洪良,郝洪涛,等.CG-5重力仪格值系数修正与应用研究[J].华南地震,2021,41(04):63.[doi:10.13512/j.hndz.2021.04.08]
 YANG Yahui,LIU Hongliang,HAO Hongtao,et al.Research on Correction and Application of Scale Parameter of CG-5 Gravimeter[J].,2021,41(01):63.[doi:10.13512/j.hndz.2021.04.08]

备注/Memo

备注/Memo:
收稿日期:2020-08-10
作者简介:刘潇(1993-),男,工程师,主要从事铁路工程精密控制测量研究。E-mail:643012734@qq.com
更新日期/Last Update: 2021-03-20