姚安、大姚中强震区地震构造初析
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摘要
对2009年7月9日云南姚安6.0级地震烈度考察和现场流动数字地震观测资料,以及自2000年以来在该地区发生的其它3次6级地震序列空间展布、震源机制、烈度分布资料的分析表明,该地区4次6级地震在震源深度、等震线长轴、序列优势空间分布等方面都具有各自的特点。结合石油部门提供的地震勘探资料综合分析认为,该地区地震构造背景十分复杂,突出表现为多方向地震构造的交织,且可能存在不同深度层次断裂构造的耦合。
Analyses based on investigation of the seismic intensity and digital seismic data by mobile observation on-site from the Yao'an M 6.0 Earthquake that occurred on 9th July 2009 in Yao'an county,Yunnan Province,and on the spatial distribution of earthquake sequences,focal mechanisms,and intensity distribution of other three earthquakes that occurred since 2000 in the same area with the similar magnitude,show that there are obviously different characteristics in earthquake focal depth,direction of the long axis of isoseismal lines,major trend of sequence spatial distribution,and so on of the four earthquakes. Comprehensive analyses combined with data from petroleum seismic exploration show that the regional seismotectonic setting is very complicated,featured by seismotectonics interweaved with different strikes and faulted structures coupling at different depths in Yao'an area.
Analyses based on investigation of the seismic intensity and digital seismic data by mobile observation on-site from the Yao'an M 6.0 Earthquake that occurred on 9th July 2009 in Yao'an county,Yunnan Province,and on the spatial distribution of earthquake sequences,focal mechanisms,and intensity distribution of other three earthquakes that occurred since 2000 in the same area with the similar magnitude,show that there are obviously different characteristics in earthquake focal depth,direction of the long axis of isoseismal lines,major trend of sequence spatial distribution,and so on of the four earthquakes. Comprehensive analyses combined with data from petroleum seismic exploration show that the regional seismotectonic setting is very complicated,featured by seismotectonics interweaved with different strikes and faulted structures coupling at different depths in Yao'an area.
引文
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[1]云南地物软件公司,2002,楚雄盆地地震勘探报告。
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熊绍柏,滕吉文,尹周勋,等.1986.攀西构造带南部地壳与上地幔结构的爆炸地震研究[J].地球物理学报,29(3):235—244.XIONG Shao-bai,TENG Ji-wen,YIN Zhou-xun,et al.1986.Explosion seismological study of the structure of the crustand upper mantle at southern part of the Panxi tectonic belt[J].Acta Geophysica Sinica,29(3):235—244(inChinese).
张福东,戚厚发.2004.从新的勘探理念寻求楚雄盆地油气勘探的突破:试论楚雄盆地的深盆气勘探前景[J].天然气地球科学,15(1):28—32.ZHANG Fu-dong,QI Hou-fa.2004.Looking for the breakthrough of the exploration for oil and gas in Chuxiong Basinin terms of the new exploration concept[J].Nature Gas Geoscience,15(1):28—32(in Chinese).
[1]云南地物软件公司,2002,楚雄盆地地震勘探报告。
白志明,王椿镛.2004.云南遮放—宾川和孟连—马龙宽角地震剖面的层析成像研究[J].地球物理学报,47(2):257—267.BAI Zhi-ming,WANG Chun-yong.2004.Tomography research of the Zhefang-Binchuan and Menglian-Malong wide-angle seismic profiles in Yunnan Province[J].Acta Geophysica Sinica,47(2):257—267(in Chinese).
国家地震局地学断面编委会.1992.云南遮放至马龙地学断面(1:1000000)(附说明书)[Z].北京:地震出版社.Geoscience Transect Compilation Committee of State Seismological Bureau of China.1992.Geoscience Transect fromZhefang to Malong,Yunnan(1∶1000000)(encl.Specifications)[Z].Seismological Press,Beijing(in Chi-nese).
刘建华,刘福田,何建坤,等.2000.攀西古裂谷的地震成像研究[J].中国科学(D辑),30(增刊):9—15.LIU Jian-hua,LIU Fu-tian,HE Jian-kun,et al.2000.Seismic tomography study on Panxi paleo-rift[J].Science inChina(Ser D),30(suppl):9—15(in Chinese).
毛玉平,万登堡.2001.2000年云南姚安6.5级地震[M].昆明:云南科技出版社.189—237.MAO Yu-ping,WAN Deng-bao.2001.2000Yao anM6.5earthquake in Yunnan[M].Yunnan Science and Technol-ogy Press,Kunming.189—237(in Chinese).
任纪舜,姜春发,张正坤,等.1980.中国大地构造及其演化[M].北京:科学出版社.1—124.REN Ji-shun,JIANG Chun-fa,ZHANG Zheng-kun,et al.1980.Geotectonic evolution of China[M].Science Press,Beijing.1—124(in Chinese).
熊绍柏,滕吉文,尹周勋,等.1986.攀西构造带南部地壳与上地幔结构的爆炸地震研究[J].地球物理学报,29(3):235—244.XIONG Shao-bai,TENG Ji-wen,YIN Zhou-xun,et al.1986.Explosion seismological study of the structure of the crustand upper mantle at southern part of the Panxi tectonic belt[J].Acta Geophysica Sinica,29(3):235—244(inChinese).
张福东,戚厚发.2004.从新的勘探理念寻求楚雄盆地油气勘探的突破:试论楚雄盆地的深盆气勘探前景[J].天然气地球科学,15(1):28—32.ZHANG Fu-dong,QI Hou-fa.2004.Looking for the breakthrough of the exploration for oil and gas in Chuxiong Basinin terms of the new exploration concept[J].Nature Gas Geoscience,15(1):28—32(in Chinese).
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