南海东部海沟的震源机制解及其构造意义
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摘要
根据马尼拉海沟及邻区地震、火山活动的分析,并结合地震震源机制和地球物理资料分析,发现马尼拉海沟在深度200多公里仍为俯冲的性质,深地震主要集中在12°N～14°N之间,地震密集区出现明显的分段特征,从北到南深度逐渐变深.震源机制解所反映的最大主压应力轴(P轴)以菲律宾大断层为界,北部主要为NW向;南部较为复杂,为NW,NE和近NS向.显示了北部以挤压逆冲为特征,南部以顺时针旋转为特征.菲律宾板块向西仰冲所产生的构造应力,被马尼拉海沟的斜向俯冲,菲律宾大断层的左旋走滑,以及民都洛断层的左旋走滑所调节.
According to the activity of earthquakes and volcanoes along the Manila trench and its adjacent region, combined with analysis of focal mechanism solutions and geophysics data, the Manila trench is still being downward subduction in the depth of 200 km. Deep earthquakes mainly concentrate between 12°N and 14°N, the concentrated region is divided into different sections, and the focal depth is gradually deep from the north to the south. From the focal mechanism solution data, the maximum principal stress direction (P axis) varies from the northern region of Philippine fault to the southern region of the fault. In the north P axes directions are mainly NW, however in the south there is the complex displaying and P axes have NW, NE and approximately NS directions. These results show the characteristic of press-thrust in the northern region of the Philippine fault and the clockwise rotation in the southern region of the fault. The stress caused by the Philippine plate, which moved upon the South China Sea sub-plate, is adjusted by the oblique subduction of the Manila trench, the sinistral strike-slip of the Philippine fault and the sinistral strike-slip of the Mindoro fault.
According to the activity of earthquakes and volcanoes along the Manila trench and its adjacent region, combined with analysis of focal mechanism solutions and geophysics data, the Manila trench is still being downward subduction in the depth of 200 km. Deep earthquakes mainly concentrate between 12°N and 14°N, the concentrated region is divided into different sections, and the focal depth is gradually deep from the north to the south. From the focal mechanism solution data, the maximum principal stress direction (P axis) varies from the northern region of Philippine fault to the southern region of the fault. In the north P axes directions are mainly NW, however in the south there is the complex displaying and P axes have NW, NE and approximately NS directions. These results show the characteristic of press-thrust in the northern region of the Philippine fault and the clockwise rotation in the southern region of the fault. The stress caused by the Philippine plate, which moved upon the South China Sea sub-plate, is adjusted by the oblique subduction of the Manila trench, the sinistral strike-slip of the Philippine fault and the sinistral strike-slip of the Mindoro fault.
引文
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李家彪,金翔龙,高金耀.2002.南海东部海盆晚期扩张的构造地貌研究[J].中国科学,D辑,32(3):239～248
李家彪,郑玉龙,金翔龙,等.2003.马尼拉俯冲带:倾斜俯冲的地貌证据[A].见:李家彪,高抒主编.中国边缘海岩石层结构与动力过程[C].北京:海洋出版社,111～117
刘以宣主编.1994.南海新构造与地壳稳定性[M].北京:科学出版社,95～107
王平.2000.南海东北部与台湾间深部构造与中、新生代沉积盆地的关系[D]:[学位论文].北京:中国地质大学,44
臧绍先,陈奇志,黄金水.1994.台湾南部—菲律宾地区的地震分布、应力状态及板块的相互作用[J].地震地质,16(1):29～37
周蒂,陈汉宗,吴世敏,等.2002.南海的右行陆缘裂解成因[J].地质学报,76(2):180～190
朱俊江,詹文欢,丘学林,等.2004.红河断裂带两侧地震震源机制及构造意义[J].大地构造与成矿学,28(3):239～247
CardwellRK,IsacksBL,KarigDE.1980.Thespatialdistributionofearthquakes,focalmechanismsolutions,and subductedlithosphereinthePhillippineandnortheasternIndonesianisland[A].In:HayesDEed.TheTectonicand GeologicalEvolutionofSoutheastAsianSeasandIslands,GeophysMonogrSer23[C].WashingtonDC:AGU,1～35
FrohlichC,AppersonKD.1992.Earthquakefocalmechanisms,momenttensors,andtheconsistencyofseismicactivity nearplateboundaries[J].Tectonics,11(2):279～296
HamburgerMW,CardwellRK,IsacksBL.1983.SeismotectonicsofthenorthernPhilippineIslandArc[A].In:HayesDEed.TectonicandGeologicalEvolutionofSoutheastAsianSeasandIslands,Part2,GeophysMonogr Ser27[C].WashingtonDC:AGU,1～22
LouvariEK,KiratziAA.1997.RAKE:Awindowsprogramtoplotearthquakefocalmechanismsandtheorientationof principalstresses[J].Computers&Geosciences,23:851～857LudwigWJ,KumarN,HoutzRE.1979.Profiler sonobuoymeasurementintheSouthChinaSeabasin[J].JGeophys Res,84(B7):3505～3518
PautotG,RanginC.1989.SubductionoftheSouthChinaSeaaxialridgebelowLuzon(Phillipines)[J].EarthPlanet SciLett,92:57～69
SchwellerWJ,KarigDE,BachmanSB.1983.OriginalsettingandemplacementhistoryoftheZambalesophiolite,Lu zon,Phillipines,fromstratigraphicevidence[A].In:HayesDEed.TectonicandGeologicalEvolutionofSoutheast AsianSeasandIslands,Part2,GeophysMonogrSer27[C].WashingtonDC:AGU,124～138
SenoT,SteinS,GrippAE.1993.AmodelforthemotionofthePhilippineSeaPlateconsistentwithNUVEL1andgeo logicaldata[J].JGeophysRes,98:17941～17948
TaylorB,HayesDE.1983.OriginandhistoryoftheSouthChinaSeaBasin[A].In:HayesDEed.TectonicandGeo logicalEvolutionofSoutheastAsianSeasandIslands,Part2,GeophysMonogrSer27[C].Washington,DC:AGU,23～56
WesselP,SmithWHF.1995.NewversionoftheGenetricMappingToolsreleased[J].EOSTransAGU,76:329
WolfeJA,SelfS.1983.StructurallineamentsandNeogenevolcanisminSouthwesternLuzon[A].In:HayesDEed.TectonicandGeologicalEvolutionofSoutheastAsianSeasandIslands,Part2,GeophysMonogrSer27[C].WashingtonDC:AGU,157～172
YuSB,KuoLC,PunongbayanRS,etal.1999.GPSobservationofcrustaldeformationintheTaiwan Luzonregion[J].GeophysResLett,26(7):923～926
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