印尼8.7、8.5级巨震对云南地区地震活动的远震触发分析
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摘要
在收集整理印尼8.7、8.5级巨震活动特点基础上,分析了这两次巨震对云南地区地震活动的远震触发特征。依据腾冲、昆明两个台站的数字波形资料,对这两次巨震的触发特点进行了分析。认为云南地区2004年12月26日后地震活动的显著增强,是由印尼8.7级巨震的长周期面波触发引起的。8.5级地震后,云南地区地震活动没有引起触发,主要原因是8.7级地震已引起相关地震活动,短期内断层不足以积累使其破裂的能量所致。远震触发的地区与高热流地区一致。
Based on collecting and settling the characteristics of the Indonesia large earthquakes with M8.7 and M8.5,the feature of the teleseismically triggered seismicity in Yunnan region under influence of the two earthquakes is analyzed. Based on the digital waveform records of Kunming and Tengchong stations,the triggering feature of the two large earthquakes is analyzed.The seismicity remarkably enhanced after 2004 December 26 in Yunnan region is considered to be caused by the long period surface-wave triggered action of Indonesia M8.7 earthquake.There is no triggered seismicity in Yunnan region after the earthquake with M8.5.The main reason is that the faults could not accumulate enough energy to produce rupture in such short time after the relative seismicity is trigged by the earthquake with M8.7.The triggered areas are consistent with the high heat flow areas.
Based on collecting and settling the characteristics of the Indonesia large earthquakes with M8.7 and M8.5,the feature of the teleseismically triggered seismicity in Yunnan region under influence of the two earthquakes is analyzed. Based on the digital waveform records of Kunming and Tengchong stations,the triggering feature of the two large earthquakes is analyzed.The seismicity remarkably enhanced after 2004 December 26 in Yunnan region is considered to be caused by the long period surface-wave triggered action of Indonesia M8.7 earthquake.There is no triggered seismicity in Yunnan region after the earthquake with M8.5.The main reason is that the faults could not accumulate enough energy to produce rupture in such short time after the relative seismicity is trigged by the earthquake with M8.7.The triggered areas are consistent with the high heat flow areas.
引文
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[2]Moran S C,Power J A,Stihler S D,et al.Earthquake Triggering at Alaskan Volcanoes Followingthe 3 November 2002 Denali Fault Earthquake[J].Bulletin of the Seismological Society of America,2004,94(6B):S300-S309.
[3]Husker A L,Brodsky E E.Seismicity in Idaho and Montana Triggered by the Denali Fault Earth-quake:A Window into the Geologic Context for Seismic Triggering[J].Bulletin of the SeismologicalSociety of America,2004,94(6B):S310-S316.
[4]Husen S,Wiemer S,Smith R B.Remotely Triggered Seismicity in the Yellowstone National ParkRegion by the 2002MW7.9 Denali Fault Earthquake,Alaska[J].Bulletin of the Seismological Socie-ty of America,2004,94(6B):S317-S331.
[5]Pankow K L,Arabasz W J,Pechmann J C,et al.Triggered Seismicity in Utah from the 3 Novem-ber 2002 Denali Fault Earthquake[J].Bulletin of the Seismological Society of America,2004,94(6B):S332-S347.
[6]Prejean S G,Hill D P,Brodsky E E,et al.Remotely Triggered Seismicity on the United StatesWest Coast following theMW7.9 Denali Fault Earthquake[J].Bulletin of the Seismological Societyof America,2004,94(6B):S348-S359.
[7]Johnston M J S,Prejean S G,Hill D P.Triggered Deformation and Seismic Activity under Mam-moth Mountain in Long Valley Caldera by the 3 November 2002MW7.9 Denali Fault Earthquake[J].Bulletin of the Seismological Society of America,2004,94(6B):S360-S369.
[8]Brodsky E E,Karakostas V,Kanamori H.A new observation of dynamically triggered regionalSeismicity:earthquakes in Greece following the August,1999 Izmit,Turkey earthquake[J].Geo-phys Res Lett,2000,27,2 741-2 744.
[9]Hill D P,Pollitz F,Newhall C.Earthquake-volcano interactions[J].Phys Today,2002,55,41-47.
[10]Brodsky E E,Prejean S G.New constraints on mechanisms of remotely triggered seismicity at LongValley Caldera[J].Journal of Geophysical Research,2005,110,B04302.
[11]汪缉安,徐青,张文仁.云南大地热流及地热地质问题[J].地震地质,1990,12(4):367-377.
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