稀疏台网反演区域地震偏量矩张量解的稳定性
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摘要
使用区域地震台网的波形资料,研究了2010年2月26日台湾以东海域MW5.4地震的偏量矩张量,所得结果与Havard CMT目录给出的解之间的Kagan角为9.5°,两者较为一致;反演得到这次地震的震源深度为41km,接近USGS给出的定位结果,可能更接近真实的震源深度.选择不同的台站组合,分析了台站布局对矩张量解的影响.结果显示,3个台站的组合基本上都可以较为准确地得到矩张量解,台站方位覆盖越好,反演得到的解的偏差越小;在合适的情况下,两个台站的组合也可以得到较为可靠的解.
Observations from regional seismic network are used in studying deviatoric moment tensor for the MW5.4 earthquake of 26 Febuary 2010 in Taiwan adjacent area.The smallest rotation angle defined by Kagan(1991) between our result and the Havard GCMT solution is 9.5°,and the focal depth we determined is 41 km,which is close to USGS location result and possibly closer to the real source.The paper also discusses the effect of station distribution on deviatoric moment tensor inversion by selecting different station combinations.The result shows that,for the data sets from three 3-component stations,the solutions are mostly accurate.The better station coverage,the less departure from real solutions.In appropriate case,the data set from two 3-components stations may result in relatively reliable solution.
Observations from regional seismic network are used in studying deviatoric moment tensor for the MW5.4 earthquake of 26 Febuary 2010 in Taiwan adjacent area.The smallest rotation angle defined by Kagan(1991) between our result and the Havard GCMT solution is 9.5°,and the focal depth we determined is 41 km,which is close to USGS location result and possibly closer to the real source.The paper also discusses the effect of station distribution on deviatoric moment tensor inversion by selecting different station combinations.The result shows that,for the data sets from three 3-component stations,the solutions are mostly accurate.The better station coverage,the less departure from real solutions.In appropriate case,the data set from two 3-components stations may result in relatively reliable solution.
引文
李志伟,胥颐,郝天珧,刘劲松.2007.利用非线性方法反演琉球—台湾—吕宋地区的岩石层P波速度结构[J].地球物理进展,22(5):1345--1351.
Ammon C J,Herrmann R B,Langston C A,Benz H.1998.Source parameters of the January16,1994WyomissingHills,Pennsylvania earthquakes[J].Seism Res Letters,69(3):261--269.
Braunmiller J,Leitner B,Nábělek J,Leitner B,Qamar A.1995.The1993Klamath Falls,Oregon earthquake sequence:source mechanisms from regional data[J].Geophys Res Lett,22(2):105--108.
Braunmiller J,Kradolfer U,Baer M,Giardini D.2002.Regional moment tensor determination in the European-Mediterranean area-initial results[J].Tectonophysics,356(1--3):5--22.
Bouchon M.1981.A simple method to calculate Green's functions for elastic layered media[J].Bull Seism Soc Amer,71(4):959--971.
Cameron A E,Asencio E,Huérfano V,Mendoza C,von Hillebrandt C.2006.Source parameters analysis of the regionalmoment tensor inversion in the Caribbean region[J].Seism Res Lett,77(2):288.
Cesca S,Buforn E,Dahm T.2006.Amplitude spectra moment tensor inversion of shallow earthquakes in Spain[J].Geophys J Int,166(2):839--854.
Dreger D S,Helmberger D V.1993.Determination of source parameters at regional distances with single station orsparse network data[J].J Geophys Res,98(5):8107--8125.
Dziewonski A M,Chou T A,Woodhouse J H.1981.Determination of earthquake source parameters from waveform datafor studies of global and regional seismicity[J].J Geophys Res,86(B4):2825--2852.
Godano M,Marc R,Anne D,Thomas B,Emmanuel G.2009.Focal mechanisms from sparse observations by nonlinearinversion of amplitudes:Method and tests on synthetic and real data[J].Bull Seism Soc Amer,99(4):2243--2264.
Ichinose A G,Anderson J G,Smith K D,Zeng Y.2003.Source parameters of eastern California and western Nevadaearthquakes from regional moment tensor inversion[J].Bull Seism Soc Amer,93(1):61--84.
Kagan Y Y.1991.3-D rotation of double-couple earthquake sources[J].Geophys J Int,106(3):709--716.
Kagan Y Y.2007.Simplified algorithms for calculating double-couple rotation[J].Geophys J Int,171(1):411--418.
Kao H,Jian P R.2001.Seismogenic patterns in the Taiwan region:Insights from source parameter inversion of BATSdata[J].Tectonophysics,333(1):179--198.
Kawakatsu H.1995.Automated near-realtime CMT inversion[J].Geophys Res Lett,22(19):2569--2572.
Kennett B.1983.Seismic Wave Propagation in Stratified Media[M].Cambridge:Cambridge University Press:1-339.
Kikuchi M,Kanamori H.1991.Inversion of complex body waves-Ⅲ[J].Bull Seism Soc Amer,81(6):2335--2350.
Kim K H,Chiu J M,Jose P,Chen K C,Huang B S,Yeh Y H,Shen P.2005.Three-dimensional VP and VS structuralmodels associated with the active subduction and collision tectonics in the Taiwan region[J].Geophys J Int,162(1):204--220.
Kubo A,Fukuyama E,Kawai H,Nonomura K.2002.NIED seismic moment tensor catalogue for regional earthquakesaround Japan:quality test and application[J].Tectonophysics,356(1--3):23--48.
Langston C A.1981.Source inversion of seismic waveforms:The Koyna,India,earthquakes of13September1967[J].Bull Seism Soc Amer,71(1):1--24.
Ma K F,Wang J H,Zhao D.1996.Three-dimensional seismic velocity structure of the crust and uppermost mantle beneath Taiwan[J].J Phys Earth,44(2):85--105.
Nábělek J,Xia G Y.1995.Moment tensor analysis using regional data:Application to the25March,1993,ScottsMills,Oregon,earthquake[J].Geophys Res Lett,22(1):13--16.
Okal E A.2005.A re-evaluation of the great Aleutian and Chilean earthquakes of1906August17[J].Geophys J Int,161(2):268--282.
Pasyanos M E,Dreger D S,Romanowicz B.1996.Toward real-time estimation of regional moment tensors[J].BullSeism Soc Amer,86(5):1255--1269.
Patton H,Zandt V.1991.Seismic moment tensors of western U S earthquakes and implications for the tectonic stressfield[J].J Geophys Res,96(B11):18245--18259.
Pondrelli S,Ekstrm G,Morelli A,Gasperini P,Vannucci G.2006.The Italian CMT dataset from1977to the present[J].Phys Earth Planet Inter,159(3--4):286--303.
Randall G E,Ammon C J,Owens T J.1995.Moment tensor estimation using regional seismograms from a Tibetan Plat-eau portable network deployment[J].Geophys Res Lett,22(13):1665--1668.
Rau R J,Wu F T.1995.Tomographic imaging of lithospheric structures under Taiwan[J].Earth Planet Sci Lett,133(3--4):517--532.
Ritsema J,Lay T.1993.Rapid source mechanism determination of large(MW≥5)earthquakes in the western UnitedStates[J].Geophys Res Lett,20(5):1611--1614.
Ritsema J,Lay T.1995.Long-period regional wave moment tensor inversion for earthquakes in the western UnitedStates[J].J Geophys Res,100(B6):9853--9864.
Romanowicz B,Dreger D,Pasyanos M,Uhrhammer R.1993.Monitoring of strain release in central and northern California using broadband data[J].Geophys Res Lett,20(15):1643--1646.
Scognamiglio L,Tinti E,Michelini A.2009.Real-time determination of seismic moment tensor for the Italian region[J].Bull Seism Soc Amer,99(4):2223--2242.
Sipkin S A.1982.Estimation of earthquake source parameters by the inversion of waveform data:synthetic waveforms[J].Phys Earth Planet Inter,30(2--3):242--259.
Sipkin S A,Needham R E.1989.Moment-tensor solutions estimated using optimal filter theory:global seismicity,1984—1987[J].Phys Earth Planet Interi,57(3--4):233--259.
Thio H K,Kanamori H.1995.Moment tensor inversion for local earthquakes using surface waves recorded a TERRAscope[J].Bull Seism Soc Amer,85(4):1021--1038.
Walter W R.1993.Source parameters of the June29,1992Little Skull Mountain earthquake from complete regionalwaveforms at a single station[J].Geophys Res Lett,20(5):403--406.
Zahradnik J,Jansky J,Plicka V.2008.Detailed waveform inversion for moment tensors of M～4events:examples fromthe Corinth Gulf,Greece[J].Bull Seism Soc Amer,98(6):2756--2771.
Ammon C J,Herrmann R B,Langston C A,Benz H.1998.Source parameters of the January16,1994WyomissingHills,Pennsylvania earthquakes[J].Seism Res Letters,69(3):261--269.
Braunmiller J,Leitner B,Nábělek J,Leitner B,Qamar A.1995.The1993Klamath Falls,Oregon earthquake sequence:source mechanisms from regional data[J].Geophys Res Lett,22(2):105--108.
Braunmiller J,Kradolfer U,Baer M,Giardini D.2002.Regional moment tensor determination in the European-Mediterranean area-initial results[J].Tectonophysics,356(1--3):5--22.
Bouchon M.1981.A simple method to calculate Green's functions for elastic layered media[J].Bull Seism Soc Amer,71(4):959--971.
Cameron A E,Asencio E,Huérfano V,Mendoza C,von Hillebrandt C.2006.Source parameters analysis of the regionalmoment tensor inversion in the Caribbean region[J].Seism Res Lett,77(2):288.
Cesca S,Buforn E,Dahm T.2006.Amplitude spectra moment tensor inversion of shallow earthquakes in Spain[J].Geophys J Int,166(2):839--854.
Dreger D S,Helmberger D V.1993.Determination of source parameters at regional distances with single station orsparse network data[J].J Geophys Res,98(5):8107--8125.
Dziewonski A M,Chou T A,Woodhouse J H.1981.Determination of earthquake source parameters from waveform datafor studies of global and regional seismicity[J].J Geophys Res,86(B4):2825--2852.
Godano M,Marc R,Anne D,Thomas B,Emmanuel G.2009.Focal mechanisms from sparse observations by nonlinearinversion of amplitudes:Method and tests on synthetic and real data[J].Bull Seism Soc Amer,99(4):2243--2264.
Ichinose A G,Anderson J G,Smith K D,Zeng Y.2003.Source parameters of eastern California and western Nevadaearthquakes from regional moment tensor inversion[J].Bull Seism Soc Amer,93(1):61--84.
Kagan Y Y.1991.3-D rotation of double-couple earthquake sources[J].Geophys J Int,106(3):709--716.
Kagan Y Y.2007.Simplified algorithms for calculating double-couple rotation[J].Geophys J Int,171(1):411--418.
Kao H,Jian P R.2001.Seismogenic patterns in the Taiwan region:Insights from source parameter inversion of BATSdata[J].Tectonophysics,333(1):179--198.
Kawakatsu H.1995.Automated near-realtime CMT inversion[J].Geophys Res Lett,22(19):2569--2572.
Kennett B.1983.Seismic Wave Propagation in Stratified Media[M].Cambridge:Cambridge University Press:1-339.
Kikuchi M,Kanamori H.1991.Inversion of complex body waves-Ⅲ[J].Bull Seism Soc Amer,81(6):2335--2350.
Kim K H,Chiu J M,Jose P,Chen K C,Huang B S,Yeh Y H,Shen P.2005.Three-dimensional VP and VS structuralmodels associated with the active subduction and collision tectonics in the Taiwan region[J].Geophys J Int,162(1):204--220.
Kubo A,Fukuyama E,Kawai H,Nonomura K.2002.NIED seismic moment tensor catalogue for regional earthquakesaround Japan:quality test and application[J].Tectonophysics,356(1--3):23--48.
Langston C A.1981.Source inversion of seismic waveforms:The Koyna,India,earthquakes of13September1967[J].Bull Seism Soc Amer,71(1):1--24.
Ma K F,Wang J H,Zhao D.1996.Three-dimensional seismic velocity structure of the crust and uppermost mantle beneath Taiwan[J].J Phys Earth,44(2):85--105.
Nábělek J,Xia G Y.1995.Moment tensor analysis using regional data:Application to the25March,1993,ScottsMills,Oregon,earthquake[J].Geophys Res Lett,22(1):13--16.
Okal E A.2005.A re-evaluation of the great Aleutian and Chilean earthquakes of1906August17[J].Geophys J Int,161(2):268--282.
Pasyanos M E,Dreger D S,Romanowicz B.1996.Toward real-time estimation of regional moment tensors[J].BullSeism Soc Amer,86(5):1255--1269.
Patton H,Zandt V.1991.Seismic moment tensors of western U S earthquakes and implications for the tectonic stressfield[J].J Geophys Res,96(B11):18245--18259.
Pondrelli S,Ekstrm G,Morelli A,Gasperini P,Vannucci G.2006.The Italian CMT dataset from1977to the present[J].Phys Earth Planet Inter,159(3--4):286--303.
Randall G E,Ammon C J,Owens T J.1995.Moment tensor estimation using regional seismograms from a Tibetan Plat-eau portable network deployment[J].Geophys Res Lett,22(13):1665--1668.
Rau R J,Wu F T.1995.Tomographic imaging of lithospheric structures under Taiwan[J].Earth Planet Sci Lett,133(3--4):517--532.
Ritsema J,Lay T.1993.Rapid source mechanism determination of large(MW≥5)earthquakes in the western UnitedStates[J].Geophys Res Lett,20(5):1611--1614.
Ritsema J,Lay T.1995.Long-period regional wave moment tensor inversion for earthquakes in the western UnitedStates[J].J Geophys Res,100(B6):9853--9864.
Romanowicz B,Dreger D,Pasyanos M,Uhrhammer R.1993.Monitoring of strain release in central and northern California using broadband data[J].Geophys Res Lett,20(15):1643--1646.
Scognamiglio L,Tinti E,Michelini A.2009.Real-time determination of seismic moment tensor for the Italian region[J].Bull Seism Soc Amer,99(4):2223--2242.
Sipkin S A.1982.Estimation of earthquake source parameters by the inversion of waveform data:synthetic waveforms[J].Phys Earth Planet Inter,30(2--3):242--259.
Sipkin S A,Needham R E.1989.Moment-tensor solutions estimated using optimal filter theory:global seismicity,1984—1987[J].Phys Earth Planet Interi,57(3--4):233--259.
Thio H K,Kanamori H.1995.Moment tensor inversion for local earthquakes using surface waves recorded a TERRAscope[J].Bull Seism Soc Amer,85(4):1021--1038.
Walter W R.1993.Source parameters of the June29,1992Little Skull Mountain earthquake from complete regionalwaveforms at a single station[J].Geophys Res Lett,20(5):403--406.
Zahradnik J,Jansky J,Plicka V.2008.Detailed waveform inversion for moment tensors of M～4events:examples fromthe Corinth Gulf,Greece[J].Bull Seism Soc Amer,98(6):2756--2771.
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