用远震接收函数研究西安地震台台基的一维速度模型

英文篇名：One dimension velocity model under Xi′an Seismic Station from teleseismic receiver function
中文刊名：地震地磁观测与研究
英文刊名：Seismological and Geomagnetic Observation and Research
作者：孙丽 ; 刘瑞丰 ; 陈友麟 ; 李柄乾 ; 徐志国 ; 黎明
英文作者：Sun Li1) ; Liu Ruifeng2) ; Chen Youlin3) ; Li Bingqian ; Xu Zhiguo2) and Li Ming1) 1) Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China 2) China Earthquake Networks Centre ; Beijing 100045 ; China 3) Harris Corporation ; USA 4) Institute of Geophysics Shanxi Earthquake Administation ; Xi′an 710068 ; China
中文关键词：接收函数 ; 远震 ; 反演 ; 莫霍面 ; 平滑约束
英文关键词：receiver function ; teleseismic ; inverse ; Moho depth ; smoothness
出版日期：2008-04-25
机构：中国地震局地球物理研究所,中国地震台网中心,Harris Corporation,陕西省地震局,中国地震台网中心,中国地震局地球物理研究所 USA
年：2008
期：02
出版单位：地震地磁观测与研究

摘要

以西安地震台1992年至2000年记录到的853个远震宽频带数字地震记录为基础,利用远震接收函数的方法反演了西安地震台台基的一维速度结构及莫霍面深度,结果表明,西安地震台下的莫霍面深度为39.7km,P波速度6.59km/s,P波与S波速度比为1.65。在反演台下一维速度模型时,对接收函数分别进行了算术平均和4次方根的叠加,对这两种不同的叠加得出了相应的反演结果。由于反演结果的非唯一性,在计算的过程中,加入了平滑参数来约束反演结果,并选择了0.2,0.3,0.4等3个平滑约束值,获得了比较理想的台基一维速度模型。
In this paper, 853 teleseismic recordings of Xi′an Seismic Station, which were recorded form year 1992 to 2000 are used. In this paper, we use the teleseismic receiver function to determine the Moho depth and the one dimension velocity model under Xi′an Seismic Station. The results show that the Moho depth under the station is 39.7 km deep, the P wave velocity is 6.59 km/s, and P wave to S wave velocity ratio is 1.65. When inversed the velocity model, we averaged the receiver functions in two ways. One is arithmetical average. The other is nth root average. According to that, we get the two group inverse results. In respect that the non-uniqueness of the inversing results, we add smoothness constraints in processing procedure. Choosing 0.2, 0.3, 0.4 three smoothness values, we compare the results.

引文

刘启元,Kind R.1997.中国数字地震台网的接收函数及其非线性反演[J].地球物理学报,40(3):356~368
    吴庆举,田小波等.2003.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,25(4):382~389
    吴庆举,田小波等.2003.用小波变换方法反演接收函数[J].地震学报,25(6):601~607
    吴庆举,曾融生.1998.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,41(5):669~679
    杨智娴,于湘伟等.2004.中国中西部地区地震的重新定位和三维地壳速度结构[J].地震学报
    张学民,刁桂苓等.2005.陕西省数字地震台下方壳幔速度结构研究[J].华北地震科学,23(2)
    Ammon.1991.The isolation of receiver effects fromteleseismic P waveform[J].BSSA,81(6):2504~2510
    Cassidy.1992.Numerical experi ments in broadband receiver function analysis[J].BSSA,82(3):1453~1474
    Felix Waldhauser and Paul G.Richards.2004.Reference Events for Regional Seismic Phases at I MS Stations in China[J].BSSA,94(6):2265~2279
    Ligorria and Ammon.1999.Iterative deconvolution and receiver-function esti mation[J].BSSA,89(5):1395~1400
    Mangino.1993.The receiver structure beneath MI NA Nevada[J].BSSA,83(2):542~560
    Owens.1987.Crustal structure at regional seismic test Network stations determinedfrominversion of broadbandteleseismic Pwaveforms[J].BSSA,77(2):631~662
    Zhu and Kanamori.2000.Moho depth variationin southern California fromteleseismic receiver functions[J].JGR,105(B2)2969~2980