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用宽频带远震接收函数研究青藏高原的地壳结构
引用本文:吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构[J].地球物理学报,1998,41(5):669-679.
作者姓名:吴庆举  曾融生
作者单位:国家地震局地球物理研究所,北京,100081
基金项目:国家自然科学基金!49374207
摘    要:为研究青藏高原的岩石层构造及其动力学过程,根据记录到的来自台站东北方向的大量宽频带远震林波波形资料,应用时间域的最大熵谱反褶积算法,得到了11个(全部)PASSCAL(地壳与岩石层的地震台阵研究计划)台站的接收函数.利用时间域广义线性反演的Jumping(跳动)算法,引入模型光滑度约束,并将合成地震图的Kennett完全算法及微分地震图的Randall快速算法用于接收函数的正演计算,由台站接收函数获得了各台站下方的一维S波速度分布.反演结果表明,青藏高原的Moho界面在班公-怒江缝合带附近存在明显的深度错断;在日喀则、拉萨、桑雄和安多等地的地壳内部,可以连续观测到三个显著的速度界面h1,h2和h3,其中h1和h2可以连续追踪到温泉、二道沟和不冻泉等地,而h3在班公-怒江缝合带以北消失;在日喀则、拉萨、桑雄、安多、二道沟和不冻泉等地有壳内低速层.关于班公-怒江缝合带附近Moho界面的错断现象,一个可能的解释是班公-怒江缝合带是印度地壳向欧亚下地壳挤入的前沿.

关 键 词:接收函数  青藏高原  S波速度结构  
收稿时间:1997-01-28

THE CRUSTAL STRUCTURE OF QINGHAI-XIZANG PLATEAU INFERRED FROM BROADBAND TELESEISMIC WAVEFORM
WU QING-JU, ZENG RONG-SHENG.THE CRUSTAL STRUCTURE OF QINGHAI-XIZANG PLATEAU INFERRED FROM BROADBAND TELESEISMIC WAVEFORM[J].Chinese Journal of Geophysics,1998,41(5):669-679.
Authors:WU QING-JU  ZENG RONG-SHENG
Institution:Institute of Geophysics, State Scismological Bureau, Beijing 100081, China
Abstract:In order to study the lithospheric strUcture and its geodyndrics of cynghai-Xizang plateau, the receiver functions of total 11 PASSCAL (Program for Array Seismic Studies of Crust and Lithosphere) stations deployed in Qinghai-Xizang plateau were isolthed from broadband teleseismic waveforms by time-domain maximum entropy deconvolution. One dimensional S wave velocity structures were inverted from receiver funtions. "Jumping Algorithm" is implemented to make trade-off between waveform fitting and model smoothness, and Kennett's seismogram and Randall's efficient differential seismogram were also involved in synthetic seismogram. The inversion results of receiver functions show that there exists obvious Moho offset near BangongNujiang suture in Qinghai-Xizang plateau, three velocity interfaces h1, h2, and h3, can be continuously traced in the crust of Qinghai-Xizang plateau, among which, h1, and h2,can be observed in Wndo, Erdo and Budo, h3 disappears to the north of BangongNuiang suture, there also exists low velocity zone in the crust of Xiga, Lhsa, Sang,Amdo, Erdo and Budo. A possible interpretation about the Moho offset near Bangong-Nujiang suture is that Bangong-Nujiang suture may be the collisional front of Indian crust into the lower crust of Eurasia.
Keywords:Receiver function  Qinghai-Xizang plateau  S wave velocity
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