CAJ | 학술논문

利用龙门山断裂带及其邻近地区地震台站的远震波形记录,采用时间域迭代反褶积技术求取接收函数,并用多次反射波能量扫描求极大值和波形叠加反演的方法（H-Kappa方法）计算出台站下方的莫霍面深度和波速比。结果显示：莫霍面位于扬子地台西缘部分向西侧倾斜缓降,深度在40～48 km变化,地壳平均波速比值为1.81;都江堰、汶川、耿达一带处在龙门山推覆体范围之内的莫霍面起伏变化不大,深度在45 km左右,地壳平均波速比值为1.707 5;龙门山断裂带西侧的松潘—甘孜地块的平均地壳波速比为1.76,莫霍面深度南面部分比北面深约10 km,呈南深北浅状。
이용룡문산단렬대급기린근지구지진태참적원진파형기록,채용시간역질대반습적기술구취접수함수,병용다차반사파능량소묘구겁대치화파형첩가반연적방법（H-Kappa방법）계산출태참하방적막곽면심도화파속비。결과현시：막곽면위우양자지태서연부분향서측경사완강,심도재40～48 km변화,지각평균파속비치위1.81;도강언、문천、경체일대처재룡문산추복체범위지내적막곽면기복변화불대,심도재45 km좌우,지각평균파속비치위1.707 5;룡문산단렬대서측적송반—감자지괴적평균지각파속비위1.76,막곽면심도남면부분비북면심약10 km,정남심북천상。
Using tele-seismograms from stations in the region along and surrounding the Longmenshan fault zone, we stacked receiver-functions by means of time-domain iterative deconvolution, using a multiply energy scan and wave form modeling inversion method ( H-Kappa), further estimated Moho depths beneath each station through the H- Kappa stacking method, and finally derived the distribution of both the Moho depth and the wave-to-velocity ratio ( Vp/Vs). The results show : The Moho of Western margin of the Yangtze Station ranges from 40 to 48 km, the wave- to-velocity ratio (Vp/Vs) is 1.81. The Moho boundary under Longmenshan nappe is of little ups and downs around 45 km, the wave-to-velocity ratio (Vp/Vs) is 1. 7075. The wave-to-velocity ratio (Vp/Vs) in Songpan-Ganzi block is 1.76. The crustal thickness of southern Songpan-Ganzi block is 10 km thicker than its northern counterpart.