腾冲火山地震群的活动特征
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摘要
根据 1998 ,1999和 2 0 0 2年腾冲火山区流动数字地震台网的 3期观测资料 ,从中选择出 30个与岩浆活动有关的地震事件 ,这些事件主要以地震群的形式出现。从地震群的时空强分布特征、各观测台的地震波记录特征、震源参数和震源机制等方面 ,分析研究区内火山地震群的活动与岩浆囊体位置的关系。结果表明 ,腾冲火山区存在 2个岩浆囊体 ,一个位于北纬 2 5 0°～ 2 5 1° ,东经 98 4 2°～98 4 8° ,深度约 4～ 6km ;另一个位于北纬 2 4 9°～ 2 5 0 5° ,东经 98 4 5°～ 98 5 5°,深度约 8～ 14km以下。地震群活动主要围绕在岩浆囊体的周围 ,与岩浆活动密切相关。岩浆囊体的存在主要控制了腾冲南部火山区的地热活动及微小构造破裂
Thirty seismic events related to magmatic activities have been selected from observation data of the mobile digital seismic network disposed in Tengchong volcanic area in 1998, 1999 and 2002. These selected events mainly occurred in cluster. The relations between the activities of volcanic earthquake clusters and the locations of magma chambers are analyzed on the basis of space-time-magnitude distributions of earthquake clusters, seismic wave characteristics, focal parameters and focal mechanisms. The anomalies of S wave records of specific event show that there are magma bodies or magma channels beneath the southern Tengchong volcanic area; focal mechanisms display that the orientation of earthquake-generating stress corresponds well with that of the regional tectonic stress. Seismic fractures are dominated mainly by horizontal strike-slip, but some seismic fractures display relatively large dip-slip components. It is inferred that the volcanic earthquake clusters are the results of shear-fracturing of the wall rocks in the vicinity of the magma chamber caused by the activities of heat medium under the action of regional tectonic stress. This study shows there are two magma bodies beneath Tengchong volcanic area: one is located at 25 0°～25 1°N, 98 42°～98 48°E and 4～6km depth, the other is located at 24 9°～25 05°N, 98 45°～98 55°E and 8～14km depth. The activities of earthquakes are mainly around the magma bodies and greatly related to magmatic activities. Magma bodies control the geothermal activity and micro-fracturing in Tengchong volcanic area.
Thirty seismic events related to magmatic activities have been selected from observation data of the mobile digital seismic network disposed in Tengchong volcanic area in 1998, 1999 and 2002. These selected events mainly occurred in cluster. The relations between the activities of volcanic earthquake clusters and the locations of magma chambers are analyzed on the basis of space-time-magnitude distributions of earthquake clusters, seismic wave characteristics, focal parameters and focal mechanisms. The anomalies of S wave records of specific event show that there are magma bodies or magma channels beneath the southern Tengchong volcanic area; focal mechanisms display that the orientation of earthquake-generating stress corresponds well with that of the regional tectonic stress. Seismic fractures are dominated mainly by horizontal strike-slip, but some seismic fractures display relatively large dip-slip components. It is inferred that the volcanic earthquake clusters are the results of shear-fracturing of the wall rocks in the vicinity of the magma chamber caused by the activities of heat medium under the action of regional tectonic stress. This study shows there are two magma bodies beneath Tengchong volcanic area: one is located at 25 0°～25 1°N, 98 42°～98 48°E and 4～6km depth, the other is located at 24 9°～25 05°N, 98 45°～98 55°E and 8～14km depth. The activities of earthquakes are mainly around the magma bodies and greatly related to magmatic activities. Magma bodies control the geothermal activity and micro-fracturing in Tengchong volcanic area.
引文
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姜朝松,周瑞琦,姚孝执.1998.腾冲火山断裂构造〔J〕.地震研究,21(4):330—336.JIANGChao song,ZHOURui qi,YAOXiao zhi.1998.FaultstructureofTengchongvolcano〔J〕.JournalofSeis mologicalResearch,21(4):330—336(inChinese).
姜朝松.1998.腾冲新生代火山分布特征〔J〕.地震研究,21(4):309—319.JIANGChao song.1998.DistributioncharacteristicsofTengchongvolcanointheCenozoicera〔J〕.JournalofSeismo logicalResearch,21(4):309—319(inChinese)
叶建庆,蔡绍平,陈敏恭,等.2000.腾冲火山地区微震观测(Ⅱ)〔J〕.地震研究,23(2):100—107.YEJian qing,CAIShao ping,CHENMin gong,etal.2000.ObservationsofmicroseismsinTengchongvolcanoar eas(Ⅱ)〔J〕.JournalofSeismologicalResearch,23(2):100—107(inChinese).
叶建庆,蔡绍平,秦嘉政,等.2000.腾冲火山地区微震类型与波谱分析〔J〕.地震研究,23(2):116—123.YEJian qing,CAIShao ping,QINJia zheng,etal.2000.TypesofmicroseismsandspectrumanalysesinTeng chongvolcanoareas〔J〕.JournalofSeismologicalResearch,23(2):116—123(inChinese).
乔成斌,林邦慧,张瑞青,等.2002.腾冲火山区地震事件(LP ,VT ,VE)的识别研究〔J〕.地震研究,25(3):281—286.QIAOCheng bin,LINBang hui,ZHANGRui qing,etal.2002.Studyondistinguishingseismicevents(LP ,VTandVE)inTenchongvolcanicregion〔J〕.JournalofSeismologicalResearch,25(3):281—286(inChinese).
斯卡佩,蒂林.2001.火山监测与减灾〔M〕.刘若新等译.北京:地震出版社.21—117.ScarpaR ,TillingRI (translatedintoChinesebyLIURuo xinetal).2001.MonitoringandMitigationofVolcanoHazards〔M〕.SeismologicalPress,Beijing.21—117(inChinese).
金森博雄,E .博斯基.1983.地震:观测、理论和解释〔M〕.柳百琪等译.北京:地震出版社.281—294.KanamoriH ,BoschiE (translatedintoChinesebyLIUBaiQietal).1983.Earthquakes:Observation,TheoryandInterpretation〔M〕.SeismologicalPress,Beijing.281—294(inChinese).
HoriS ,HasegawaA .1991.Locationofamid crustalmagmabodybeneathMt.Moriyoshi,NorthernAkitaPrefec ture,asestimatedfromreflectedSxSPhases〔J〕.Earthquake,44(2):39—48(inJapanese).
许忠淮,阎明,赵仲和.1983.由多个小震推断的华北地区构造应力场的方向〔J〕.地震学报,5(3):268—279.XUZhong huai,YANMing,ZHAOZhong he.1983.EvaluationofthedirectionoftectonicstressinNorthChinafromrecordeddataofalargenumberofsmallearthquakes〔J〕.ActaSeismologicaSinica,5(3):268—279(inChinese).
姜朝松.1998.腾冲地区新生代火山活动分期〔J〕.地震研究,21(4):320—329.JIANGChao song.1998.PerioddivisionofvolcanoactivitiesintheCenozoiceraofTengchong〔J〕.JournalofSeis mologicalResearch,21(4):320—329(inChinese).
秦嘉政,钱晓东,皇甫岗.1996.腾冲火山地区的地震活动特征〔J〕.地震地磁观测与研究,17(4):19—27.QINJia zheng,QIANXiao dong,HUANGFUGang.1996.TheseismicityfeatureofthevolcanicareainTengchong〔J〕.SeismologicalandGeomagneticObservationandResearch,17(4):19—27(inChinese).
刘宝城,佟伟,张保山,等.1986.腾冲火山地热区的微震观测〔J〕.地球物理学报,29(6):547—555.LIUBao cheng,TONGWei,ZHANGBao shan,etal.1986.ObservationsofmicroseismsinTengchongvolcanoareas〔J〕.ActaGeophysicaSinica,29(6):547—555(inChinese).
叶建庆,陈敏恭,刘学军,等.1998.腾冲火山地区微震观测(Ⅰ)〔J〕.地震研究,21(4):343—348.YEJian qing,CHENMin gong,LIUXue jun,etal.1998.Observationofmicro shocksintheareasofTengchongvolcano(Ⅰ)〔J〕.JournalofSeismologicalResearch,21(4):343—348(inChinese).
姜朝松,周瑞琦,姚孝执.1998.腾冲火山断裂构造〔J〕.地震研究,21(4):330—336.JIANGChao song,ZHOURui qi,YAOXiao zhi.1998.FaultstructureofTengchongvolcano〔J〕.JournalofSeis mologicalResearch,21(4):330—336(inChinese).
姜朝松.1998.腾冲新生代火山分布特征〔J〕.地震研究,21(4):309—319.JIANGChao song.1998.DistributioncharacteristicsofTengchongvolcanointheCenozoicera〔J〕.JournalofSeismo logicalResearch,21(4):309—319(inChinese)
叶建庆,蔡绍平,陈敏恭,等.2000.腾冲火山地区微震观测(Ⅱ)〔J〕.地震研究,23(2):100—107.YEJian qing,CAIShao ping,CHENMin gong,etal.2000.ObservationsofmicroseismsinTengchongvolcanoar eas(Ⅱ)〔J〕.JournalofSeismologicalResearch,23(2):100—107(inChinese).
叶建庆,蔡绍平,秦嘉政,等.2000.腾冲火山地区微震类型与波谱分析〔J〕.地震研究,23(2):116—123.YEJian qing,CAIShao ping,QINJia zheng,etal.2000.TypesofmicroseismsandspectrumanalysesinTeng chongvolcanoareas〔J〕.JournalofSeismologicalResearch,23(2):116—123(inChinese).
乔成斌,林邦慧,张瑞青,等.2002.腾冲火山区地震事件(LP ,VT ,VE)的识别研究〔J〕.地震研究,25(3):281—286.QIAOCheng bin,LINBang hui,ZHANGRui qing,etal.2002.Studyondistinguishingseismicevents(LP ,VTandVE)inTenchongvolcanicregion〔J〕.JournalofSeismologicalResearch,25(3):281—286(inChinese).
斯卡佩,蒂林.2001.火山监测与减灾〔M〕.刘若新等译.北京:地震出版社.21—117.ScarpaR ,TillingRI (translatedintoChinesebyLIURuo xinetal).2001.MonitoringandMitigationofVolcanoHazards〔M〕.SeismologicalPress,Beijing.21—117(inChinese).
金森博雄,E .博斯基.1983.地震:观测、理论和解释〔M〕.柳百琪等译.北京:地震出版社.281—294.KanamoriH ,BoschiE (translatedintoChinesebyLIUBaiQietal).1983.Earthquakes:Observation,TheoryandInterpretation〔M〕.SeismologicalPress,Beijing.281—294(inChinese).
HoriS ,HasegawaA .1991.Locationofamid crustalmagmabodybeneathMt.Moriyoshi,NorthernAkitaPrefec ture,asestimatedfromreflectedSxSPhases〔J〕.Earthquake,44(2):39—48(inJapanese).
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