2002年腾冲火山区微震观测
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摘要
20 0 2年 6月 13日至 9月 13日腾冲火山区流动数字化地震台网记录了腾冲火山区及周边地区的 2 92次地震事件。对资料的初步分析表明 ,在本次观测期间 ,腾冲火山区南部地区火山地震活动仍然频繁 ,以微震为主。选用发生在火山区的 33个地震震源参数计算得出的拐角频率为 4 37～11 87Hz、应力降为 0 0 0 5～ 0 2 77MPa ,显示该区域尚属低应力分布区。S波湮灭图像的再次出现 ,充分表明在腾冲县城西南至热海的马鞍山火山、老龟坡火山一带有岩浆囊熔融体存在的可能 ,深度不超过 10km。文中还展示了台网记录到的S波湮灭、微破裂高频地震、波形特征类似火山颤动 (包络型事件 )的图像
This paper introduces the results of micro-earthquake observation by digital mobile seismic observation network disposed in Tengchong volcanic area during the period from June 6 to September 13, 2002. During the observation, 292 seismic events occurred in Tengchong and its peripheral areas had been recorded. The analysis of the obtained data shows that the volcanic earthquake activity in the southern part of Tencgchong volcanic area is still very frequent, appearing mainly as micro-earthquake. Based on the source parameters of 33 seismic events occurred in the area, it is calculated that the corner frequency ranges between 4.37Hz and 11.87Hz, and the stress drop is in the range of 0.005～0.277MPa. This may indicate that this area is still dominated by low stress. The phenomenon of S-wave annihilation may fully evidence the existence of magma pocket at less than 10km depth beneath the Ma'anshan and Laoguipo volcanoes in the area from the southwest of Tengchong County to Rehai. Moreover, various patterns recorded by the network, such as S wave annihilation, micro-fracture high-frequency earthquake, and the waveforms typical of volcanic vibration are presented in this paper as well.
This paper introduces the results of micro-earthquake observation by digital mobile seismic observation network disposed in Tengchong volcanic area during the period from June 6 to September 13, 2002. During the observation, 292 seismic events occurred in Tengchong and its peripheral areas had been recorded. The analysis of the obtained data shows that the volcanic earthquake activity in the southern part of Tencgchong volcanic area is still very frequent, appearing mainly as micro-earthquake. Based on the source parameters of 33 seismic events occurred in the area, it is calculated that the corner frequency ranges between 4.37Hz and 11.87Hz, and the stress drop is in the range of 0.005～0.277MPa. This may indicate that this area is still dominated by low stress. The phenomenon of S-wave annihilation may fully evidence the existence of magma pocket at less than 10km depth beneath the Ma'anshan and Laoguipo volcanoes in the area from the southwest of Tengchong County to Rehai. Moreover, various patterns recorded by the network, such as S wave annihilation, micro-fracture high-frequency earthquake, and the waveforms typical of volcanic vibration are presented in this paper as well.
引文
皇甫岗,姜朝松主编.2000.腾冲火山研究〔M〕.昆明:云南科技出版社.176—243.HUANGFUGang,JIANGChao song.2000.ResearchonTengchongVolcanoes〔M〕.ScienceandTechnologyPub lishingHouseofYunnan,Kunming.176—243(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.ObservationsofmicroseismsinTengchongvolcanoareas(Ⅱ)〔J〕.JournalofSeismologicalResearch,23(2):100—107(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).
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.ObservationsofmicroseismsinTengchongvolcanoareas(Ⅱ)〔J〕.JournalofSeismologicalResearch,23(2):100—107(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).
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