[1]尹得余,刘启方,王振宇.远场记录反演2016年4月17日厄瓜多尔Mw7.8地震破裂过程[J].地震工程与工程振动,2017,01(05):001-10.[doi:10.13197/j.eeev.2017.05.1.yindy.001]
 YIN Deyu,LIU Qifang,WANG Zhenyu.Rupture process of the 17 April 2016 Ecuador Mw7.8 earthquake by teleseismic records[J].EARTHQUAKE ENGINEERING AND ENGINEERING DYNAMICS,2017,01(05):001-10.[doi:10.13197/j.eeev.2017.05.1.yindy.001]
点击复制

远场记录反演2016年4月17日厄瓜多尔Mw7.8地震破裂过程
分享到:

《地震工程与工程振动》[ISSN:/CN:]

卷:
01
期数:
2017年05期
页码:
001-10
栏目:
论文
出版日期:
2017-10-01

文章信息/Info

Title:
Rupture process of the 17 April 2016 Ecuador Mw7.8 earthquake by teleseismic records
作者:
尹得余1 刘启方1 王振宇2
1. 中国地震局工程力学研究所, 中国地震局地震工程与工程振动重点实验室, 黑龙江 哈尔滨 150080;
2. 防灾科技学院 防灾工程系, 河北 三河 065201
Author(s):
YIN Deyu1 LIU Qifang1 WANG Zhenyu2
1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration Harbin 150080, China;
2. Institute of Disaster Prevention, Sanhe 065201, China
关键词:
厄瓜多尔Mw7.8级地震远场位移记录非负最小二乘法破裂过程
Keywords:
Ecuador Mw7.8 earthquaketeleseismic displacement recordnon-negative least square methodrupture process
分类号:
P315
DOI:
10.13197/j.eeev.2017.05.1.yindy.001
摘要:
本文选取震中距30°~90°远场40个台站垂直向P波位移记录,采用非负最小二乘法结合多时间视窗技术,反演了2016年4月17日厄瓜多尔Mw7.8级地震震源破裂过程。采用棋盘测试对数据的反演能力进行了分析,表明最佳分辨率为子断层尺寸10 km×10 km。反演结果表明:断层破裂速度约为3.2 km/s,破裂发生在深度27 km以上,有两个凹凸体。第1个凹凸体在初始破裂点附近,最大滑动量2.0 m,以逆冲错动为主,破裂持续14 s,释放14%的地震矩。第2个凹凸体在初始破裂点西南侧50 km处,最大滑动量3.4 m,为逆冲兼左旋走滑,破裂持续20 s,释放69%的地震矩。整个断层面破裂持续50 s,释放地震矩5.3×1020 N·m。对反演参数的分析表明,结果对震源时间函数的形式不敏感;远场速度记录反演结果相比位移记录,有更多的子断层参与破裂,地震矩和残差都变大。
Abstract:
Using teleseismic vertical displacement records of 40 stations with epicenter distance in 30°~90°, the 17 April 2016 Ecuador Mw7.8 earthquake is inversed by non-negative least square method and multiple time windows. The resolving power of the data was investigated by checkboard tests, which showed that the best subfault size was 10 km×10 km. The inversion results show that the rupture velocity was 3.2 km/s and concentrated in the deep above 27 km. The fault had two asperities. One was around the initial rupture point, which peak slip was 2.0 m and was characterized by thrust motion. The rupture duration time was 14 s and released 14% of the total moment. The other located in the area 50 km southwest of the epicenter. The peak slip was 3.4 m and characterized by thrust and left lateral strike-slip. Duraion of the rupture was 20 s and released 69% of the total moment. The entire rupture lasted for 50 s and the total seismic moment released was 5.3×1020 N·m. Analysis of the inversion parameters showed that, the result was insensitive to the form of the slip rate function. Compared to the result of diplacement, the velocity result had more subfaults participate in the rupture, and the moment and residual error were larger.

参考文献/References:

[1] Hartzell S,Heaton T H. Inversion of strong ground motion and teleseismic waveform data for the fault rupture history of the 1979 Imperial Valley, California, earthquake[J]. Bull. Seismol. Soc. Amer,1983,73(6):1553-1583.
[2] 李裕彻,卢振业,丁鉴海等译. 地震事典[M]. 北京:地震出版社. 1990. LI Yuche,LU Zhenye,DING Jianhai,et al(translation). Encyclopedia of earthquake[M]. Beijing:Seismological Press,1990. (in Chinese)
[3] 王振杰, 欧吉坤. 用L-曲线法确定岭估计中的岭参数[J]. 武汉大学学报·信息科学版, 2004,29(3):235-238. WANG Zhenjie,OU Jikun. Determining the ridge parameter in a ridge estimation using L-curve method[J]. Geomatics and Information Science of Wuhan University,2004,29(3):235-238. (in Chinese)
[4] Beresnev I A. Uncertainties in finite-fault slip inversions:to what extent to believe?[J]. Bull. Seismol. Soc. Amer,2003, 93(6):2445-2458.
[5] Hartzell S, Liu P C,Mendoza M. Stability and uncertainty of finite-fault inversion s:application to the 2004 Parkfield, California,Earthquake[J]. Bull. Seismol. Soc. Amer, 2007, 97(6):1911-1934.
[6] Liu C L, Zeng Y,Xiong X, et al. Rupture processes of the 2012 September 5Mw 7.6 Nicoya, Costa Rica earthquake constrained by improved geodetic and seismological observations[J]. Geophysical Journal International, 2015,203:175-183.
[7] Yokota Y, Koketsu K, Fujii Y, et al. Joint inversion of strong motion, teleseismic, geodetic, and tsunami datasets for the rupture process of the 2011 Tohoku earthquake[J]. Geophysical Research Letters, 2011, 38 L00G21.
[8] Somerville P K,Irikura R,Graves S,et al. Characterizing crustal earthquake slip models for the prediction of strong ground motion[J]. Seismol. Res. Lett,1999,70:59-80.
[9] 陈章立,译. 地震学引论[M]. 北京:地震出版社. 2008. CHEN Zhangli(translation). Introduction to seismology[M]. Beijing:Seismological Press,2008.(in Chinese)
[10] 张勇, 冯万鹏, 许力生泰,等. 2008年汶川大地震的时空破裂过程[J]. 中国科学D辑:地球科学, 2008, 38(10):1186-1194. ZHANG Yong, FENG Wanpeng, XU Lisheng,et al. The rupture process of the Great Wenchuan Earthquake[J]. Science China Earthquake Sciences,2008, 38(10):1186-1194. (in Chinese)
[11] Ma K F, Mori J,Lee S J, et al. Spatial and temporal distribution of slip for the 1999 chi-chi, taiwan, earthquake[J]. Bull. Seismol. Soc. Amer, 2001,91(5):1069-1087.

备注/Memo

备注/Memo:
收稿日期:2016-08-10;改回日期:2016-12-12。
基金项目:国家自然科学基金项目(51378479);中国地震局工程力学研究所基本科研业务费专项资助项目(2016A04);国家重大科技专项(2013zx06002001-09)
作者简介:尹得余(1987-),男,博士研究生,主要从事震源破裂过程反演的研究.E-mail:yindeyuiem@163.com
通讯作者:刘启方(1969-),男,研究员,博士,主要从事地震工程的研究.E-mail:qifang_liu@126.com
更新日期/Last Update: 2017-10-25