A STUDY ON DIRECTION OF THE SEISMOGENIC FAULT OF LUDIAN M6.5 EARTHQUAKE BASED ON STRONG MOTION AND SEISMOGRAPHIC DATA

doi:10.3969/j.issn.0253-4967.2015.26

SEISMOLOGY AND GEOLOGY ›› 2015, Vol. 37 ›› Issue (1): 331-341.DOI: 10.3969/j.issn.0253-4967.2015.26

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A STUDY ON DIRECTION OF THE SEISMOGENIC FAULT OF LUDIAN M6.5 EARTHQUAKE BASED ON STRONG MOTION AND SEISMOGRAPHIC DATA

FENG Wei^1,2, LIU Jie¹, LUO Jia-hong³, HOU Jian-sheng⁴, XU Wan-zhen²

1 China Earthquake Networks Center, Beijing 100045, China;
2 Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
3 Institute of Geology, China Earthquake Administration, Beijing 100029, China;
4 China Earthquake Administration, Beijing 100036, China

Received:2014-09-17 Revised:2015-01-23 Published:2015-05-15

基于强震和测震数据对鲁甸6.5级地震发震断层方向的研究

冯蔚^1,2, 刘杰¹, 罗佳宏³, 侯建盛⁴, 徐婉桢²

1 中国地震台网中心, 北京 100045;
2 中国地震局地震预测研究所, 北京 100036;
3 中国地震局地质研究所, 北京 100029;
4 中国地震局, 北京 100036

通讯作者: 刘杰,研究员,E-mail:liujie@seis.ac.cn。
作者简介:冯蔚,男,1985年生,2008年毕业于长安大学地球物理学专业,工程师,目前主要从事地震信号处理分析、地震灾害评估与应急,电话:010-59959410,E-mail:fengwei@seis.ac.cn。
基金资助:
"十二五"国家科技支撑计划项目(2012BAK19B02)和中国地震局"云南鲁甸6.5级地震专题研究"项目共同资助

Abstract

Abstract:

Ludian M6.5 earthquake on August 3, 2014 occurred in Ludian country, Zhaotong City, Yunnan Province. The epicenter is located at longitude 103.3°E and latitude 27.1°N with focal depth of 12km. Macro epicenter is located in Longtoushan Town, Ludian Country. The seismogenic fault is the NW-striking Baogunao-Xiaohe Fault, which is a second-order strike-slip fault of the NE-striking Zhaotong-Ludian Fault system. In this paper, we use observation records of 50 strong motion stations in the Ludian earthquake to calculate the distributions of peak ground acceleration and horizontal peak ground acceleration. According to the records, we find that the strong motion records decay slowly along the northwestern direction, thus we infer that the seismogenic fault is in NW direction. Meanwhile, the horizontal peak acceleration distribution map is similar with the synthetic three-component peak acceleration distribution map, which illustrates the horizontal component is the main part. Normalized S-wave radiation patterns are drawn using the observation records of 135 seismic stations. In contrast to single couple source radiation pattern, we infer that the seismogenic fault is in NW direction. The amplitude in the southeast direction is slightly larger than the amplitude in the northwest and the difference is not big, showing that the rupture trends slightly to the southeast. The above results show that, the conclusion of Ludian M6.5 earthquake rupture along the northwest direction is in consistency with the observation results of the strong motion stations and the seismic stations. In addition, the distribution of earthquake disaster also supports this conclusion.

Key words: Ludian M6.5 earthquake, rupture direction, peak ground acceleration, radiation amplitude pattern of S-wave

摘要：

2014年8月3日16时30分, 云南省昭通市鲁甸县发生M6.5地震, 宏观震中位于鲁甸县龙头山镇(27.1°N, 103.3°E), 深度约12km。发震断层为NW向包谷垴-小河断裂, 是NE向昭通-鲁甸断裂系的NW向次级走滑断层。文中利用鲁甸地震50个强震台站观测记录与135个测震台站观测记录, 分别进行峰值加速度计算和S波辐射图案匹配, 对此次地震发震断层方向进行讨论。结果表明, "NW向"的断层方向更符合强震、测震仪器观测值, 同时与地震灾害现场调查结果一致。

关键词: 鲁甸6.5级地震, 破裂方向, 峰值加速度, S波辐射图案

CLC Number:

P315

FENG Wei, LIU Jie, LUO Jia-hong, HOU Jian-sheng, XU Wan-zhen. A STUDY ON DIRECTION OF THE SEISMOGENIC FAULT OF LUDIAN M6.5 EARTHQUAKE BASED ON STRONG MOTION AND SEISMOGRAPHIC DATA[J]. SEISMOLOGY AND GEOLOGY, 2015, 37(1): 331-341.

冯蔚, 刘杰, 罗佳宏, 侯建盛, 徐婉桢. 基于强震和测震数据对鲁甸6.5级地震发震断层方向的研究[J]. 地震地质, 2015, 37(1): 331-341.

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A STUDY ON DIRECTION OF THE SEISMOGENIC FAULT OF LUDIAN M6.5 EARTHQUAKE BASED ON STRONG MOTION AND SEISMOGRAPHIC DATA

基于强震和测震数据对鲁甸6.5级地震发震断层方向的研究

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