2011年云南腾冲5.2级双震发震机理
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摘要
本研究联合使用观测震相到时和波形互相关数据,采用双差法对2011年6月20日与8月9日发生在云南腾冲的5.2级双震及其余震序列进行重定位,并采用gCAP(generalized Cut and Paste)方法反演了该双震全矩张量解.结果显示,双震震中位于龙川江断裂的西侧,余震序列在深度上为一个倾斜的柱状体,且倾向腾冲火山区;6月20日和8月9日5.2级地震均表现为体积缩小的闭合型破裂,包含有显著的非双力偶成分,但后者包含的非双力偶成分相对明显减小.这些结果表明,云南腾冲5.2级双震及余震活动可能与火山下方的地壳岩浆作用密切相关,龙川江断裂为热物质向上运移提供了通道,而双震型地震的发生可能与首次地震的破裂体积缩小挤出的流体作用于断裂密切相关.
On 20 June and 9 August 2011 two MS5.2earthquakes occurred in the Tengchong volcanic area,and we call them the double earthquakes because both their origin times and earthquake hypocenters are all close to each other.For better understanding the rupture mechanism of these double earthquakes,we inferred their full moment tensor solutions and relocated their seismic sequences.Using the arrival times collected from observation bulletins and obtained from the waveform cross-correlation method,we relocated the MS5.2double earthquake sequences with the doubledifference location algorithm.These data were recorded by the CEA Crustal Institute temporary and Yunnan provincial permanent seismic stations.We obtained the full moment tensor solutions of double earthquakes with the generalized Cut and Paste(gCAP)inversion method.The gCAP method includes the parametersζand representing the strengths of the ISO and CLVD terms,respectively.Our results show that the epicenters of these double earthquakes are located west of the Longchuanjiang fault,and their aftershocks are a column tilted toward the Tengchong volcanic area with depth.The 20 June and 9 August MS5.2 2011 double earthquakes are a kind of earthquakes with the volume-closed rupture mechanism having an obvious non-double-couple component,and the latter is much weaker in the non-double-couple component.The bootstrap test shows the values of the parametersζand are all located in their 95%confidence intervals,which demonstrates the reliability of non-double-couple components in our results.These results suggest that the MS5.2double earthquakes and their aftershocks are closely associated with the crustal magmatism under the Tengchong volcano and the Longchuanjiang fault provides a channel for hot material upwelling.We conclude that the occurrence of double earthquakes could be closely related to the obvious reduction in the rupture volume of the first earthquake,which leads to the extrusion of fluids that affect the fault again.
引文
Bai D H,Liao Z J,Zhao G Z,et al.1994.The inference ofmagmatic heat source beneath the Rehai(Hot Sea)field ofTengchong from the result of magnetotelluric sounding.ChineseScience Bulletin,39(7):572-577.
    Chapman C H,Leaney W S.2012.A new moment-tensordecomposition for seismic events in anisotropic media.Geophys.J.Int.,188(1):343-370.
    Chen W W,Ni S D,Wang Z J,et al.2012.Joint inversion withboth local and teleseismic waveforms for source parameters of the2010Kaohsiung earthquake.Chinese J.Geophys.(in Chinese),55(7):2319-2328,doi:10.6038/j.issn.0001-5738.2012.07.017.
    Du W X,Thurber C H,Eberhart-Phillips D.2004.Earthquakerelocation using cross-correlation time delay estimates verifiedwith the bispectrum method.Bull.Seism.Soc.Am.,94(3):856-866.
    Efron B.1979.Bootstrap methodsanother look at the jackknife.Ann.Stat.,7:1-26.
    Efron B,Tibshirani R.1986.Bootstrap methods for standarderrors,confidence intervals,and other measures of statisticalaccuracy.Statistical Science,54-75.
    Foulger G R,Julian B R,Hill D P,et al.2004.Non-double-couplemicroearthquakes at Long Valley caldera,California,provideevidence for hydraulic fracturing.Journal of Volcanology andGeothermal Research,132(1):45-71.
    Frohlich C.1995.Characteristics of well-determined non-doublecouple earthquakes in the Harvard CMT catalog.Phys.EarthPlanet.Inter.,91(4):213-228.
    Hu J F,Cong L L,Su Y J,et al.2003.Distribution characteristicsof Q value of the Lg coda in Yunnan and its adjacent region.Chinese J.Geophys.(in Chinese),46(6):809-813.
    Huangfu G.1997.Review of studies on Tengchong volcanoes.Journal of Seismological Research(in Chinese),20(4):431-437.
    Hudson J A,Pearce R G,Rogers R M.1989.Source type plot forinversion of the moment tensor.J.Geophys.Res.,94:765-774.
    Jiang C S,Zhou Z H,Zhao C P.2004.The structur characteristicsof the crust and upper mantle in the area of Tengchong volcano.Journal of Seismological Research(in Chinese),27(Suppl.):1-6.
    Julian B R,Miller A D,Foulger G R.1998.Non-double-coupleearthquakes theory.Reviews of Geophysics,36(4):525-549.
    Lei J S,Xie F R,Fan Q C,et al.2013.Seismic imaging of the deepstructure under the Chinese volcanoes:An overview.Phys.Earth Planet.Inter.,224:104-123,doi:10.1016/j.pepi.2013.08.008.
    Lei J S,Zhao D P.2009.Structural heterogeneity of theLongmenshan fault zone and the mechanism of the 2008Wenchuan earthquake(Ms8.0).Geochem.Geophys.Geosyst.,10Q10010,doi:10.1029/2009GC002590.
    Lei J S,Zhao D P,Su Y J.2009.Insight into the origin of theTengchong intraplate volcano and seismotectonics in southwestChina from local and teleseismic data.J.Geophys.Res.,114:B05302.
    Lei J S,Zhang G W,Xie F R,et al.2012a.Relocation of the 10March 2011 Yingjiang,China,earthquake sequence and itstectonic implications.Earthquake Science,25:103-110.
    Lei J S,Xie F R,Mishra O P,et al.2012b.The 2011Yingjiang,China,Earthquake:A volcano-related fluid-driven earthquake?Bull.Seismol.Soc.Am.,102(1):417-425.
    Lei J S,Li Y,Xie F R,et al.2014.Pn anisotropic tomography anddynamics under eastern Tibetan plateau.J.Geophys.Res.,119:2174-2198.
    Li C,Van der Hilst R,Meltzer A,et al.2008.Subduction of theIndian lithosphere beneath the Tibetan Plateau and Burma.Earth Planet.Sci.Lett.,274:157-168.
    Li D M,Li Q,Chen W J.2000.Volcanic activities in the Tengchongvolcano area since Pliocene.Acta Petrologica Sinica(in Chinese),16(3):362-370.
    Li S Q,Chen Q F,Zhao L,et al.2013.Anomalous focal mechanismof the May 2011 Mw5.7deep earthquake in Northeastern China:regional waveform inversion and possible mechanism.Chinese J.Geophys.(in Chinese),56(9):2959-2970.
    Lou H,Wang C Y,Huang G,et al.2002.Three-dimensionalseismic velocity tomography of the upper crust in Tengchongvolcanic area,Yunan province.Acta Seismologica Sinica(inChinese),24(3):243-251.
    Miller A D,Foulger G R,Julian B R.1998.Non-double-coupleearthquakes observations.Reviews of Geophysics,36(4):551-568.
    Pei S P,Liu J,Ma H S,et al.2010.Dynamic variation of S-wave Qvalue beneath Sichuan-Yunnan,China.Chinese J.Geophys.(inChinese),53(7):1639-1652.
    Qin J Z,Huangfu G,Zhang J W.1998.Characteristics of Qvaluesaround Tengchong volcano and adjacent areas.Journal ofSeismological Research(in Chinese),21(4):358-361.
    Qin J Z,Huangfu G,Li Q,et al.2000.3-D chromatography ofvelocity structure in Tengchong volcano areas and nearby.Journal of Seismological Research(in Chinese),23(2):157-165.
    Sun C Q,Lei J S,Li C,et al.2013.Crustal anisotropy beneath theYunnan region and dynamic implications.Chinese J.Geophys.(in Chinese),56(12):4095-4105.
    Vavryuk V.2002.Non-double-couple earthquake of 1997January inWest Bohemia,Czech Republic:evidence of tensile faulting.Geophys.J.Int.,149:364-373.
    Waldhauser F,Ellsworth W L.2000.A double-difference earthquakelocation algorithm:method and application to the NorthernHayward Fault,California.Bull.Seismol.Soc.Am.,90(6):1353-1368.
    Wang C Y,Lou H,Wu J P,et al.2002.Seismological study on thecrustal structure of Tengchong volcano-geothermal area.ActaSeismologica Sinica(in Chinese),24(3):231-242.
    Wang C Y,Chan W W,Mooney W D.2003a.Three-dimensionalvelocity structure of crust and upper mantle in southwesternChina and its tectonic implications.J.Geophys.Res.,108(B9)2442,doi:10.1029/2002JB001973.
    Wang C Y,Huangfu G.2004.Crustal structure in TengchongVolcano-Geothermal Area,western Yunnan,China.Tectonophysics,380:69-87.
    Wang S Y,Xu Z H,Pei S P.2003b.Velocity structure ofuppermost mantle beneath North China from Pn tomography andits implications.Science in China Series D:Earth Sciences,46(2):130-140.
    Xu Y,Zhong D L,Liu J H.2012.Constraints of deep structures onthe crust-mantle decoupling in the western Yunnan and themagma activity in the Tengchong volcanic area.Progress inGeophysics(in Chinese),27(3):846-855,doi:10.6038/j.issn.1004-2903.2012.03.003.
    Yang X T,Xu Y,Liu J H,et al.2011.Seismic tomography in theTengchong volcanic area and its tectonic implication.Chinese J.Geophys.(in Chinese),54(8):2050-2059.
    Ye J Q,Cai S P,Liu X J,et al.2003.Characteristics of earthquakecluster activity in Tengchong volcanic area.Seismology andGeology(in Chinese),25(Suppl.):128-137.
    Yin A.2000.Mode of Cenozoic east-west extension in Tibetsuggesting a common origin of rifts in Asia during the Indo-Asiancollision.J.Geophys.Res.,105(B9):21745-21759.
    Zhang G W,Lei J S,Liang S S,et al.2014.Relocations and focalmechanism solutions of the 3 August 2014 Ludian,YunnanMs6.5earthquake sequence.Chinese J.Geophys.(in Chinese),57(9):3018-3027.
    Zhao C P,Ran H,Chen K H.2006.Present day magma chambersin Tengchong volcano area inferred from relative geothermalgradient.Acta Petrologica Sinica(in Chinese),22(6):1517-1528.
    Zhao C P,Ran H,Wang Y.2012.Present-day mantle-derivedhelium release in the Tengchong volcanic field,Southwest China:implications for tectonics and magmatism.Acta Petrologica Sinica(inChinese),28(4):1189-1204.
    Zhao L,Luo Y,Liu T Y,et al.2013.Earthquake focal mechanismsin Yunnan and their inference on the regional stress field.Bull.Seism.Soc.Am.,103(4):2498-2507.
    Zheng X F,Ou B,Zhang D N,et al.2009.Technical systemconstruction of Data Backup Centre for China SeismographNetwork and the data support to researches on the Wenchuanearthquake.Chinese J.Geophys.(in Chinese),52(5):1412-1417.
    Zhou R Q,Guo S M,He W.1998.A study on the rupturing modelof the double-main shock in the Longlin-Lancang fault zone.Seismology and Geology(in Chinese),20(3):261-268.
    Zhu L P,Helmberger D V.1996.Advancement in source estimationtechniques using broadband regional seismograms.Bull.Seism.Soc.Am.,86(5):1634-1641.
    Zhu L P,Rivera L A.2002.A note on the dynamic and staticdisplacements from a point source in multilayered media.Geophys.J.Int.,148(3):619-627.
    Zhu L P,Ben-Zion Y.2013.Parametrization of general seismicpotency and moment tensors for source inversion of seismicwaveform data.Geophys.J.Int.,194(2):839-843.
    白登海,廖志杰,赵国泽等.1994.从MT深结果推论腾冲热海热田的岩浆热源.科学通报,39(4):344-347.
    陈伟文,倪四道,汪贞杰等.2012.2010年高雄地震震源参数的近远震波形联合反演.地球物理学报,55(7):2319-2328.doi:10.6038/j.issn.0001-5738.2012.07.017
    胡家富,丛连理,苏有锦等.2003.云南及周边地区Lg尾波Q值的分布特征.地球物理学报,46(6):809-813.
    皇甫岗.1997.腾冲火山研究综述.地震研究,20(4):431-437.
    姜朝松,周真恒,赵慈平.2004.腾冲火山区地壳及上地幔结构特征.地震研究,27(增刊):1-6.
    李大明,李齐,陈文寄.2000.腾冲火山区上新世以来的火山活动.岩石学报,16(3):362-370.
    李圣强,陈棋福,赵里等.2013.2011年5月中国东北Mw5.7深震的非同寻常震源机制:区域波形反演与成因探讨.地球物理学报,56(9):2959-2970.
    楼海,王椿镛,皇甫岗等.2002.云南腾冲火山区上部地壳三维地震速度层析成像.地震学报,24(3):243-251.
    裴顺平,刘杰,马宏生等.2010.川滇地区横波Q值动态变化.地球物理学报,53(7):1639-1652.
    秦嘉政,皇甫岗,张俊伟.1998.腾冲火山及周围地区的地壳Q值特征.地震研究,21(4):358-361.
    秦嘉政,皇甫岗,李强等.2000.腾冲火山及邻区速度结构的三维层析成象.地震研究,23(2):157-165.
    孙长青,雷建设,李聪等.2013.云南地区地壳各向异性及其动力学意义.地球物理学报,56(12):4095-4105.
    王椿镛,楼海,吴建平等.2002.腾冲火山地热区地壳结构的地震学研究.地震学报,24(3):231-242.
    胥颐,钟大赉,刘建华.2012.滇西地区壳幔解耦与腾冲火山区岩浆活动的深部构造研究.地球物理学进展,27(3):846-855,doi:10.6038/j.issn.1004-2903.2012.03.003.
    杨晓涛,胥颐,刘建华等.2011.腾冲火山区的地震层析成像及其构造意义.地球物理学报,54(8):2050-2059.
    叶建庆,蔡绍平,刘学军等.2003.腾冲火山地震群的活动特征.地震地质,25(增刊):128-137.
    张广伟,雷建设,梁姗姗等.2014.2014年8月3日云南鲁甸Ms6.5级地震序列重定位与震源机制研究.地球物理学报,57(9):3018-3027.
    赵慈平,冉华,陈坤华.2006.由相对地热梯度推断的腾冲火山区现存岩浆囊.岩石学报,22(6):1517-1528.
    赵慈平,冉华,王云.2012.腾冲火山区的现代幔源氦释放:构造和岩浆活动意义.岩石学报,28(4):1189-1204.
    郑秀芬,欧阳飚,张东宁等.2009.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑.地球物理学报,52(5):1412-1417.
    周瑞琦,虢顺民,何蔚.1998.龙陵—澜沧断裂带双震型强震活动破裂模型讨论.地震地质,20(3):261-268.

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