Focal mechanism of the Nepal MW7.9 earthquake on 25 April 2015
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Key words:
- P wave first-motion /
- grid search technique /
- focal mechanism /
- Nepal
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图 1 2015年尼泊尔MW7.9地震震中和本文所用地震台站的分布
MW7.9 earthquake and stations used in this study Solid triangles denote the stations with compression P-wave first-motion,open trianlges denote the stations with dilatation P-wave first-motion,and the red asterisk denotes the epicenter of the 2015 Nepal MW7.9 earthquake
Figure 1. Distribution of epicenter of the 2015 Nepal
图 2 2015年尼泊尔MW7.9地震的震源机制解.黄色弧线为最优解附近的可能解的界限
MW7.9 earthquake.Red solid circles represent compression P-wave first-motion,and red open circles represent dilatation P-wave first-motion.The yellow arcs are the limiting solutions of the favorred solution
Figure 2. The focal mechanism solution of the 2015 Nepal
图 3 2015年4月25日尼泊尔MW7.9地震及其余震(M≥3.0)的震中分布数据截至2015年5月12日16时， 目录由中国地震台网中心提供
Figure 3. Epicentral distribution of the April 25,2015 Nepal MW7.9 earthquake and its aftershocks (M≥3.0) The data is up to 16:00 on May 12,2015.The earthquake catalog is from China Earthquake Networks Center
表 1 不同机构和本文得到的尼泊尔MW7.9地震震源机制解对比
Table 1. Comparison of the focal mechanism solutions of the Nepal MW7.9 earthquake from various institutions
机构或来源 节面Ⅰ 节面Ⅱ P轴 T轴 B轴 走向
/°倾角
/°滑动角
/°走向
/°倾角
/°滑动角
/°方位角
/°倾角
/°方位角
/°倾角
/°方位角
/°倾角
/°中国地震台网中心(2015) 96 83 88 294 7 108 188 38 52 4 96 2 GCMT(2015) 95 83 88 291 7 106 187 38 33 52 92 2 USGS(2015) 99 83 89 290 7 101 190 38 88 52 99 1 本文 92 62 67 313 36 126 198 14 321 65 103 20 
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郑秀芬, 欧阳飚, 张东宁, 姚志祥, 梁建宏, 郑洁. 2009. "国家数字测震台网数据备份中心"技术系统建设及其对汶川大地震研究的数据支撑[J]. 地球物理学报, 52(5): 1412--1417. doi:10.3969/j.issn.0001-5733.2009.05.031.Zheng X F, Ouyang B, Zhang D N, Yao Z X, Liang J H, Zheng J. 2009. Technical system construction of Data Backup Centre for China Seismograph Network and the data support to researches on the Wenchuan earthquake[J]. Chinese Journal of Geophysics, 52(5): 1412--1417. doi:10.3969/j.issn.0001-5733.2009.05.031 (inChinese). 中国地震台网中心. 2015. 2015年04月25日震源机制解M8.1级地震[EB/OL]. [2015-05-10]. http://dzyj.ac.cn/Mechanism_particular.php?id=509&types=cat8&title=震源机制解.China Earthquake Networks Center. 2015. Focal mechanism solution for the M8.1 earthquake on April 25, 2015[EB/OL]. [2015-05-10]. http://dzyj.ac.cn/Mechanism_particular.php?id=509&types=cat8&title=focalmechanism (in Chinese). GCMT. 2015. Global centroid moment tensor project[EB/OL]. [2015-05-10]. http://www.ldeo.columbia.edu/-gcmt/projects/CMT/catalog/NEW_QUICK/E201504250611A.ndk. USGS. 2015. M7.8: 36 km E of Khudi, Nepal[EB/OL]. [2015-05-10]. http://earthquake.usgs.gov/earthquakes/eventpage/us20002926#scientific_tensor:us_us20002926. -
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