龙岗火山区尾波Q值的初步研究
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摘要
基于Sato单次散射模型,利用2007年5月至2010年2月龙岗火山测震台网记录到的发生在火山区及邻近地区内的41次ML≥1.6地震的波形资料,计算了龙岗火山区的尾波Q值,得出尾波Q值与频率的关系为Q(f)=(42.65±7.53)f(0.8459±0.1642),具有以低Q值高η值为特征的火山构造活跃地区的尾波性质。火山区尾波Q值的空间分布显示,金龙顶子火山附近的金川台尾波Q0值为31.98,明显低于其它台站。结合深地震探测和垂直形变资料成果,佐证了龙岗火山岩浆囊的位置可能在金龙顶子火山附近。
According to Sato(1977)single scattering model and using 41 earthquakes with ML≥1.6 in the Longgang volcano and the nearby regions recorded by Longgang volcano digital seismic network from 2007 to February 2010,the coda Q value in the Longgang volcanic region was determined.All of events used in this paper occurred at depths from 6 to 10km,with the epicentral distances less than 75km.The results show that the coda Q has a dependence with frequency as Q(f)=(41.65±11.74)f (0.845 9±0.164 2),which is characteristic of coda in active volcanic regions as low Q value and high η value.Compared to other volcanic areas in the world,the average Qc of the Longgang volcanic area is obviously lower.Distribution of coda Q value on Longgang volcano shows that coda Q0 value at Jinchuan seismic station near Jinlongdingzi volcano is 31.98,significantly lower than other stations’,which,in combination with the deep seismic sounding data and vertical deformation data,proves that the magma chambers probably locate in the vicinity of Jinlongdingzi volcano.For the lower coda Q0 value,we interpret the strong attenuation of coda waves near the Longgang volcano is possibly related to high temperature medium caused by magma chambers.
According to Sato(1977)single scattering model and using 41 earthquakes with ML≥1.6 in the Longgang volcano and the nearby regions recorded by Longgang volcano digital seismic network from 2007 to February 2010,the coda Q value in the Longgang volcanic region was determined.All of events used in this paper occurred at depths from 6 to 10km,with the epicentral distances less than 75km.The results show that the coda Q has a dependence with frequency as Q(f)=(41.65±11.74)f (0.845 9±0.164 2),which is characteristic of coda in active volcanic regions as low Q value and high η value.Compared to other volcanic areas in the world,the average Qc of the Longgang volcanic area is obviously lower.Distribution of coda Q value on Longgang volcano shows that coda Q0 value at Jinchuan seismic station near Jinlongdingzi volcano is 31.98,significantly lower than other stations’,which,in combination with the deep seismic sounding data and vertical deformation data,proves that the magma chambers probably locate in the vicinity of Jinlongdingzi volcano.For the lower coda Q0 value,we interpret the strong attenuation of coda waves near the Longgang volcano is possibly related to high temperature medium caused by magma chambers.
引文
段永红,张先康,杨卓新,等.2003.长白山天池火山基底结构的研究[J].地震地质,25(3):501—508.DUAN Youg-hong,ZHANG Xian-kang,YANG Zhuo-xin,et al.2003.Crystalline basement structure of ChangbaishanTianchi volcanic area[J].Seismology and Geology,25(3):501—508(in Chinese).
樊祺诚.2008.长白山火山的历史与演化[J].资源调查与环境,29(3):196—202.FAN Qi-cheng.2008.History and evolution of Changbaishan volcano[J].Resources Survey and Environment,29(3):196—202(in Chinese).
樊祺诚,隋建立,刘若新,等.2002.吉林龙岗第四纪火山活动分期[J].岩石学报,18(4):495—500.FAN Qi-cheng,SUI Jian-li,LIU Ruo-xin,et al.2002.Periods of Quaternary volcanic activity in Longgang area,JilinProvince[J].Acta Petrologica Sinica,18(4):495—500(in Chinese).
高金哲,刘杰,桑成良,等.2007.长白山天池火山区的尾波Q值估计[J].中国地震,23(4):400—409.GAO Jin-zhe,LIU Jie,SANG Cheng-liang,et al.2007.Coda Q estimates in the Mt.Changbai Tianchi volcanic region,Northeast China[J].Earthquake Research in China,23(4):400—409(in Chinese).
胡亚轩,王庆良,王雄.2009.利用垂直形变资料分析龙岗火山的活动性[J].地震研究,32(3):289—294.HU Ya-xuan,WANG Qing-liang,WANG Xiong.2009.Analysis of activity of Longgang Volcano based on vertical de-formation[J].Journal of Seismological Research,32(3):289—294(in Chinese).
李白基,秦嘉政,叶建庆,等.2000.腾冲火山区剪切波和尾波衰减初步研究[J].地震研究,23(2):136—141.LI Bai-ji,QIN Jia-zheng,YE Jian-qing,et al.2000.Primariy study on attenuation of shear waves and coda in Tengchongvolcano area[J].Journal of Seismological Research23(2):136—141(in Chinese).
刘若新.2000.中国的活火山[M].北京:地震出版社.67—74.LIU Ruo-xin.2000.Active Volcanoes in China[M].Seismological Press,Beijing.67—74(in Chinese).
周连庆,赵翠萍,修济刚,等.2008.利用天然地震研究地壳Q值的方法和进展[J].国际地震动态,350(2):1—10.ZHOU Lian-qing,ZHAO Cui-ping,XIU Ji-gang,et al.2008.Methods and development of research on crustal Q value byusing earthquakes[J].Recent Developments in World Seismology,350(2):1—10(in Chinese).
张先康,张成科,赵金仁,等.2002.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.ZHANG Xian-kang,ZHANG Cheng-ke,ZHAO Jin-ren,et al.2002.Deep seismic sounding investigation into the deepstructure of the magma system in Changbaishan Tianchi volcanic region[J].Acta Seismologica Sinica,24(2):135—143(in Chinese).
Aki k.1969.Analysis of the seismic coda of local earthquake as acattered waves[J].J Geophys Res,74:615—631.
Aki k.1980.Scattering and attenuation of shear waves in the lithosphere[J].J Geophys Res,85:6496—6504.
Aki K,Chout B.1975.Origin of coda wave:source,attenuation and scattering effects[J].J Geophys Res,80:3322—3342.
Chouet B.1976.Source scattering and attenuation effects on high frequency seismic waves[D].Ph D Thesis.Massa-chusetts Institute of Technology,Cambridge,Massachusetts.
Del Pezzo E,De Natale,Scarcella G,et al.1985.Qc of three-component seismograms of volcanic microearthquakes atCampi Flegrei volcanic area,southern Italy[J].Pure Appl Geophys,123:683—696.
Sato H.1977.Energy propagation including scattering effect:Single isotropic scattering approximation[J].Bull SeisSoc Amer,68:923—948.
Steck L K,Prothero W A,Scheimer J.1989.Site-dependent coda Q at Mono Craters,Califonia[J].Bull Seism Soc A-mer,79:1559—1574.
Victor Wong.2001.Attenuation of coda wave at Tres Viegebes volcanic area Baja California Sur Mexico[J].Bull SeisSoc Amer,91(4):683—693.
Wu J P,Jiao W J,Ming Y H,et al.2006.Attenuation of coda waves at the Changbaishan Tianchi volcanic area in North-east China[J].Pageoph,163:1351—1368.
樊祺诚.2008.长白山火山的历史与演化[J].资源调查与环境,29(3):196—202.FAN Qi-cheng.2008.History and evolution of Changbaishan volcano[J].Resources Survey and Environment,29(3):196—202(in Chinese).
樊祺诚,隋建立,刘若新,等.2002.吉林龙岗第四纪火山活动分期[J].岩石学报,18(4):495—500.FAN Qi-cheng,SUI Jian-li,LIU Ruo-xin,et al.2002.Periods of Quaternary volcanic activity in Longgang area,JilinProvince[J].Acta Petrologica Sinica,18(4):495—500(in Chinese).
高金哲,刘杰,桑成良,等.2007.长白山天池火山区的尾波Q值估计[J].中国地震,23(4):400—409.GAO Jin-zhe,LIU Jie,SANG Cheng-liang,et al.2007.Coda Q estimates in the Mt.Changbai Tianchi volcanic region,Northeast China[J].Earthquake Research in China,23(4):400—409(in Chinese).
胡亚轩,王庆良,王雄.2009.利用垂直形变资料分析龙岗火山的活动性[J].地震研究,32(3):289—294.HU Ya-xuan,WANG Qing-liang,WANG Xiong.2009.Analysis of activity of Longgang Volcano based on vertical de-formation[J].Journal of Seismological Research,32(3):289—294(in Chinese).
李白基,秦嘉政,叶建庆,等.2000.腾冲火山区剪切波和尾波衰减初步研究[J].地震研究,23(2):136—141.LI Bai-ji,QIN Jia-zheng,YE Jian-qing,et al.2000.Primariy study on attenuation of shear waves and coda in Tengchongvolcano area[J].Journal of Seismological Research23(2):136—141(in Chinese).
刘若新.2000.中国的活火山[M].北京:地震出版社.67—74.LIU Ruo-xin.2000.Active Volcanoes in China[M].Seismological Press,Beijing.67—74(in Chinese).
周连庆,赵翠萍,修济刚,等.2008.利用天然地震研究地壳Q值的方法和进展[J].国际地震动态,350(2):1—10.ZHOU Lian-qing,ZHAO Cui-ping,XIU Ji-gang,et al.2008.Methods and development of research on crustal Q value byusing earthquakes[J].Recent Developments in World Seismology,350(2):1—10(in Chinese).
张先康,张成科,赵金仁,等.2002.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.ZHANG Xian-kang,ZHANG Cheng-ke,ZHAO Jin-ren,et al.2002.Deep seismic sounding investigation into the deepstructure of the magma system in Changbaishan Tianchi volcanic region[J].Acta Seismologica Sinica,24(2):135—143(in Chinese).
Aki k.1969.Analysis of the seismic coda of local earthquake as acattered waves[J].J Geophys Res,74:615—631.
Aki k.1980.Scattering and attenuation of shear waves in the lithosphere[J].J Geophys Res,85:6496—6504.
Aki K,Chout B.1975.Origin of coda wave:source,attenuation and scattering effects[J].J Geophys Res,80:3322—3342.
Chouet B.1976.Source scattering and attenuation effects on high frequency seismic waves[D].Ph D Thesis.Massa-chusetts Institute of Technology,Cambridge,Massachusetts.
Del Pezzo E,De Natale,Scarcella G,et al.1985.Qc of three-component seismograms of volcanic microearthquakes atCampi Flegrei volcanic area,southern Italy[J].Pure Appl Geophys,123:683—696.
Sato H.1977.Energy propagation including scattering effect:Single isotropic scattering approximation[J].Bull SeisSoc Amer,68:923—948.
Steck L K,Prothero W A,Scheimer J.1989.Site-dependent coda Q at Mono Craters,Califonia[J].Bull Seism Soc A-mer,79:1559—1574.
Victor Wong.2001.Attenuation of coda wave at Tres Viegebes volcanic area Baja California Sur Mexico[J].Bull SeisSoc Amer,91(4):683—693.
Wu J P,Jiao W J,Ming Y H,et al.2006.Attenuation of coda waves at the Changbaishan Tianchi volcanic area in North-east China[J].Pageoph,163:1351—1368.
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