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| 矩震级及震源机制相似地震的辐射能量差别——2014年鲁甸地震与景谷地震宽频带体波震级的比较 |
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宋潇潇1,2, 吴忠良1,1,1, 蒋长胜1, 李佳威1
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1.中国地震局地球物理研究所, 北京市民族大学南路5号 100081;2.湖北省地震局, 武汉市武昌区洪山侧路40号 430071
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| 摘要: |
| 2014年8月3日鲁甸地震和10月7日景谷地震具有相似的矩震级和震源机制，但所造成的灾害却相差甚远。为考察地震辐射能量在这两次地震致灾过程中的作用，本文利用震中距6°~80°范围内记录了鲁甸地震的142个台站、记录了景谷地震的138个台站的宽频带地震记录，计算了累积宽频带体波震级mBc。结果表明鲁甸地震的mBc高于景谷地震，因此地震辐射能量的差别对解释两次地震灾害的差别有不可忽视的作用。 |
| 关键词: 鲁甸地震 景谷地震 地震辐射能量 宽频带体波震级 矩震级 |
| DOI： |
| 分类号:P315 |
| 基金项目:中国地震局“云南鲁甸‘8·3’6.5级地震系统性科学考察”项目资助 |
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| Difference in energy radiation from earthquakes with similar moment magnitude and focal mechanism—A comparison of the broadband body-wave magnitudes of the 2014 Ludian and Jinggu earthquake |
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Song Xiaoxiao1,2, Wu Zhongliang1,1,1, Jiang Changsheng1, Li Jiawei1
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1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2.Earthquake Administration of Hubei Province, Wuhan 430071, China
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| Abstract: |
| In spite of the similar moment/surface wave magnitude and similar near-vertical strike-slip faulting,the August 3,2014,Ludian,Yunnan,MS6.5/MW6.2 earthquake and the October 7,2014,Jinggu,Yunnan,MS6.6/MW6.1 earthquake caused sharply different disasters,the former having a fatality/missing up to about 700 and injury about 3,000,and the latter fatality 1 and injury about 300. To investigate the role of seismic radiated energy in such a difference,we analyzed 142 broadband(BB)vertical recordings of the Ludian earthquake and 138 BB vertical recordings of the Jinggu earthquake,with epicentral distance 6°~80°,and calculated the broadband cumulative body-wave magnitude mBc. It is shown that the mBc of the Ludian earthquake is about 0.3 higher than the Jinggu earthquake,indicating that radiated energy contributes significantly to the difference of the earthquake disasters. |
| Key words: Ludian earthquake Jinggu earthquake Seismic radiated energy Broadband body-wave magnitude Moment magnitude |
