长白山天池火山区浅部构造特征研究
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摘要
2002年在长白山天池火山区完成了10条测线的浅层地震探测和6条测线的超浅层地震探测.结果表明,在整个勘探区内存在3个稳定的浅层地层界面,个别区段的浅层地层界面多达7个,而在500m深度以下没有出现明显的反射震相.天池西南部的地层层位个数明显多于天池西北部,这表明天池西南部的断层对火山喷发熔岩流向较天池西北部的断层有更强的控制作用.探测中发现6条浅部断层,这些断层大都近于直立,成地堑式,多分布在天池火山口的西南侧,这说明天池西南部的火山活动比天池西北部更为强烈,从而推测天池火山的主控断裂即北东向的六道沟—天池—甑峰山断裂比北西向的白山镇—天池—金策断裂的活动性更强.
A seismic survey by 10 shallow profiles and 6 ultra-shallow profiles was performed in Changbaishan Tianchi volcanic region in 2002. The result shows that there are three (in some areas as many as seven) stable interfaces in the survey region, but no reflection phases are found in depths greater than 500 m. The number of interfaces in the southwestern part is obviously greater than in the northwestern part of Tianchi volcano, which suggests that the faults in the southwest have a stronger controlling power over the flow direction of volcano-spewed lava as compared with those in the northwest. Six shallow faults exist in the survey region. The shallow faults are nearly vertical graben-like faults and are mostly distributed on the southwest of Tianchi crater, indicating that volcanic activities in the southwest are stronger than in the northwest. On this ground, it could be further deduced that the NE-trending major fault of Tianchi volcano-Liudaogou-Tianchi-Zengfengshan fault-is more active than the NW-trending Baishanzhen-Tianchi-Jince fault.
A seismic survey by 10 shallow profiles and 6 ultra-shallow profiles was performed in Changbaishan Tianchi volcanic region in 2002. The result shows that there are three (in some areas as many as seven) stable interfaces in the survey region, but no reflection phases are found in depths greater than 500 m. The number of interfaces in the southwestern part is obviously greater than in the northwestern part of Tianchi volcano, which suggests that the faults in the southwest have a stronger controlling power over the flow direction of volcano-spewed lava as compared with those in the northwest. Six shallow faults exist in the survey region. The shallow faults are nearly vertical graben-like faults and are mostly distributed on the southwest of Tianchi crater, indicating that volcanic activities in the southwest are stronger than in the northwest. On this ground, it could be further deduced that the NE-trending major fault of Tianchi volcano-Liudaogou-Tianchi-Zengfengshan fault-is more active than the NW-trending Baishanzhen-Tianchi-Jince fault.
引文
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金伯禄,张希有.1994.长白山天池火山地质研究[M].长春:东北朝鲜民族教育出版社,57
刘嘉麒.1998.中国火山[M].北京:科学出版社,1~219
刘明军,顾梦林,孙振国,等.2004.长白山天池火山区的主断裂活动与热液蚀变带[J].中国地震,20(1):64~72
刘若新.2000.中国的活火山[M].北京:地震出版社,17~31
刘若新,李继泰,魏海泉,等.1992.长白山天池火山一座具潜在喷发危险的近代火山[J].地球物理学报,35(5):661~664
刘若新,魏海泉,李继泰,等.1995.火山作用与人类环境[M].北京:地震出版社,1~13
刘若新,魏海泉,李继泰,等.1998.长白山天池火山近代喷发[M].北京:科学出版社,19~47
上官志冠,郑雅琴,董继川.1997.长白山天池火山地热区溢逸出气体的物质来源[J].中国科学,D辑,27(4):318~324
上官志冠,孙明良.1996.长白山天池火山区幔源稀有气体释放特征[J].科学通报,41(18):1695~1698
汤吉,刘铁胜,江钊.1997.长白山天池火山区大地电磁测深初步观测[J].地震地质,19(2):164~170
汤吉,邓前辉,赵国泽,等.2001.长白山天池火山区电性结构和岩浆系统[J].地震地质,23(2):191~200
王夫运,张先康,杨卓欣.2002.用地震走时反演长白山天池火山地区的二维地壳结构[J].地震学报,42(2):144~152
吴建平,明跃红,刘一鸣,等.2003.2002年8月20日长白山天池火山区小震震群研究[J].地震地磁观测与研究,24(4):1~8
吴建平,明跃红,张恒荣,等.2005.2002年夏季长白山天池火山区的地震活动性研究[J].地球物理学报,48(3):621~628
杨卓欣,张先康,赵金仁,等.2005.长白山天池火山区上地壳三维速度层析成像[J].地球物理学报,48(1):107~115
张成科,张先康,赵金仁,等.2002.长白山天池火山区及邻近地区壳幔结构探测研究[J].地球物理学报,45(6):812~820
张先康,张成科,赵金仁,等.2000.长白山天池火山区岩浆系统深部结构的深地震测深研究[J].地震学报,24(2):135~143
YilmazOZ.2001.SeismicDataAnalysis:Processing,Inversion,andInterpretationofSeismicData[M].Tulsa:So-cietyofExplorationGeophysicists,VolumeI,90~150
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