用转换函数方法研究台湾地区三维深部结构
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摘要
利用台湾数字地震台网提供的三分量地震波形记录 ,应用转换函数及快速模拟退火算法对台湾地区 5 9个地震站下的地壳横波速度结构进行了反演 ,从而获得了台湾地区三维深部结构 .结果显示地壳界面的最深处位于中央山脉西侧 ,与台湾布格重力异常分布的特点较为一致 .说明由于台湾地区造山运动还处于年轻阶段 ,中央山脉的山根发育尚不完整 ,远未达到静力学均衡 ,因此台湾地区地壳处于动力学平衡状态 .
According to the three-components teleseismic records, the S-wave velocity structure beneath 59 teleseismic stations of Taiwan by the transform function method and the SA technique. The result shows that the thickest part of the crust is located at the western flank of the Central Range. This conclusion is consistent with the result form the Bouguer gravity anomaly. It indicates that the orogenic evolution of Taiwan is still in the young period, and the developing root of Central Range dose not reach static balance. The crust of Taiwan remains in the state of dynamic equilibrium.
According to the three-components teleseismic records, the S-wave velocity structure beneath 59 teleseismic stations of Taiwan by the transform function method and the SA technique. The result shows that the thickest part of the crust is located at the western flank of the Central Range. This conclusion is consistent with the result form the Bouguer gravity anomaly. It indicates that the orogenic evolution of Taiwan is still in the young period, and the developing root of Central Range dose not reach static balance. The crust of Taiwan remains in the state of dynamic equilibrium.
引文
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[4] LINCH .The1999Taiwanearthquake:Aproposedstress focusing,HeelShapedModel.Bull.Seism.Soc.Am.,2001,91:1053～1061
[5] PhinneyRA .Structureoftheearth’scrustfromspectralbehavioroflong periodbodywaves.J .geophys.Res.,1964,69:2997～3017
[6] LangstonCA .StructureunderMountRainier,Washington,inferredfromteleseismicbodywaves.J .Geophys.Res.,1979,84:4749～4762
[7] ZhaoLS ,SenMK ,StoffaP ,etal.ApplicationofveryfastsimulatedannealingtothedeterminationofthecrustalstructurebeneathTibet.Geophys.J .Int.,1996,125:355～370
[8] YAOZX ,HarkriderDG .Ageneralizedreflection transmissioncofficientmatrixanddiscretewavenumbermethodforsyntheticseismograms.Bull.Seism.Soc.Am.,1983,73:1685～1699
[9] 纪 晨,姚振兴.用于地球物理反演的均匀设计优化算法.地球物理学报,1996,39(27):233～242JIChen,YAOZhenxing.Theuniformdesignoptimizedmethodforgeophysicsinversion.ChineseJ .Geophys.(ActaGeophysicaSinica),1996,39(27):233～242
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[11] RothmanDH .Automaticestimationoflargeresidualstaticscorrections.Geophysics,1986,51:332～346
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