甘东南地区基于射线追踪面波频散三维成像
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摘要
利用甘肃东南部地区(32.2°~33.5°N,102.7°~105.5°E)62个流动台站的垂直分量连续背景噪声记录数据,经过处理得到了所有可能台站对的面波互相关函数和瑞利波相速度频散曲线,采用基于射线追踪的面波频散直接反演方法得到了观测台站下方5~20km深度范围内的剪切波速度分布图像。结果表明,5km深度对应的剪切波速度横向变化与地表断裂带分布和沉积层厚度存在一定的相关性,西秦岭北缘断裂带以北地区多为低速区,漳县盆地、临洮盆地低速是沉积层较厚(近几km)的一种表征;10km深度对应的剪切波速度在西秦岭北缘断裂以南、临潭—宕昌断裂、礼县—罗家堡断裂之间的区域为低速区,光盖山—迭山北麓断裂周围为高速区;在15km深度左右,迭部—白龙江断裂附近形成了高低速相间的分块结构;在18km深度左右,西秦岭北缘断裂带附近呈现高速特征,10~18km深度范围内速度随深度逐渐增加,其变化幅度一般为0.2km/s。
We used the vertical component of data from 62 flow stations recording continuous background noise to determine the possible interaction of surface-wave-related functions and Rayleigh-wave-phase velocity dispersion curves in southeastern Gansu(32.2°~33.5°N,102.7°~105.5°E).We used the ray-tracing surface-wave-dispersion direct inversion method for five observation stations within a 20-km shear wave velocity distribution image depth range.The results show that there is a correlation between shear wave velocity corresponding to a 5-km depth and lateral variations in the thickness distribution of the deposited layer in the surface fault zone.In addition,the northern West Qinling fault zone is mostly a low-speed zone.Also,the Zhangxian and Lintao Basins belong to one type of characterization of the deposited thick layer(the last a few kilometres).About a 10-km depth corresponds to the shear wave velocity in the south margin fault of Lingbei Xiqin.The Lintan—Dangchang fault in the Lixian—Luojiabao area is between the low-fracture velocity zone,with light covered mountains-stacked high speed around the Northern Piedmont fault zone.There is a block structure of high and low rendering features near the DiebuBailong River Ling fault at about a 15-km depth.At about a 10~18-km depth range,the speed gradually increases with depth and the magnitude of the change is about 0.2km/s.
We used the vertical component of data from 62 flow stations recording continuous background noise to determine the possible interaction of surface-wave-related functions and Rayleigh-wave-phase velocity dispersion curves in southeastern Gansu(32.2°~33.5°N,102.7°~105.5°E).We used the ray-tracing surface-wave-dispersion direct inversion method for five observation stations within a 20-km shear wave velocity distribution image depth range.The results show that there is a correlation between shear wave velocity corresponding to a 5-km depth and lateral variations in the thickness distribution of the deposited layer in the surface fault zone.In addition,the northern West Qinling fault zone is mostly a low-speed zone.Also,the Zhangxian and Lintao Basins belong to one type of characterization of the deposited thick layer(the last a few kilometres).About a 10-km depth corresponds to the shear wave velocity in the south margin fault of Lingbei Xiqin.The Lintan—Dangchang fault in the Lixian—Luojiabao area is between the low-fracture velocity zone,with light covered mountains-stacked high speed around the Northern Piedmont fault zone.There is a block structure of high and low rendering features near the DiebuBailong River Ling fault at about a 15-km depth.At about a 10~18-km depth range,the speed gradually increases with depth and the magnitude of the change is about 0.2km/s.
引文
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[2]张少泉,武利钧,郭建民,等.中国西部地区门源—平凉—渭南地震测深剖面资料的分析解释[J].地球物理学报,1985,28(5):349-361.ZHANG Shao-quan,WU Li-jun,GUO Jian-min,et al.An Interpretation of the DSS Data on Menyuan—Weinan Profile in West Chine[J].Chinese Journal of Geophysics,1985,28(5):349-361.(in Chinese)
[3]王椿镛,林中洋,陈学波.青海门源—福建宁德地学断面综合地球物理研究[J].地球物理学报,1995,38(5):590-598.WANG Chun-yong,LIN Zhong-yang,CHEN Xue-bo.Comprehensive Study of Geophysics on Geoscience Transect from Menyuan,Qinghai Province,to Ningde,Fujian Province China[J].Chinese Journal of Geophysics,1995,38(5):590-598.(in Chinese)
[4]闵祥仪,周民都,郭建康,等.灵台—阿木云乎剖面地壳速度结构[J].西北地震学报,1991,13(增刊):29-36.MIN Xiang-yi,ZHOU Min-du,GUO Jian-kang,et al.The Crustal Velocity Structure in Lingtai—Amuquhu Profile[J].Northwestern Seismological Journal,1991,13(Supp):29-36.(in Chinese)
[5]李清河,郭建康,周民都,等.成县—西吉剖面地壳速度结构[J].西北地震学报,1991,13(增刊):37-43.LI Qing-he,GUO Jian-kang,ZHOU Min-du,et al.The Velocity Structure of Chengxian—Xiji Profile[J].Northwestern Seismological Journal,1991,13(Supp):37-43.(in Chinese)
[6]张元生,周名都,荣代潞,等.祁连山中东段地区三维速度结构研究[J].地震学报,2004,26(3):247-255.ZHANG Yuan-sheng,ZHOU Min-du,RONG Dai-lu,et al.3-D Velocity Structure in the Central-eastern Part of Qilianshan[J].Acta Seismologica Sinica,2004,26(3):247-255.(in Chinese)
[7]周名都,张元生,石雅缪,等.青藏高原东北缘地壳三维结构[J].地球物理学进展,2006,21(1):127-134.ZHOU Min-du,ZHANG Yuan-sheng,SHI Ya-liao,et al.Three-dimensional Cruetal Velocity Structure in the Northeastern Margin of the Qinghai-Tibetan Plateau[J].Progress in Geophysics,2006,21(1):127-134.(in Chinese)
[8]李永华,吴庆举,安张辉,等.青藏高原东北缘地壳S波速度结构与泊松比及其意义[J].地球物理学报,2006,49(5):1359-1368.LI Yong-hua,WU Qing-ju,AN Zhang-hui,et al.The Poisson Ratio and Crustal Structure Across the NE Tibetan Plateau Determined from Receiver Functions[J].Chinese Journal of Geophysics,2006,49(5):1359-1368.(in Chinese)
[9]许忠淮,汪素云,裴顺平.青藏高原东北缘地区Pn波速度的横向变化[J].地震学报,2003,25(1):24-31.XU Zhong-hui,WANG Su-yun,PEI Shun-ping.Lateral Variation of Pn Velocity Beneath Northeastern Marginal Region of Qingzang Plateau[J].Acta Seismologica Sinica,2003,25(1):25-31.(in Chinese)
[10]王椿镛,楼海,吕智勇,等.青藏高原东部地壳上地幔S波速度结构——下地壳流的深部环境[J].中国科学:D辑(地球科学),2008,38(1):22-32.WANG Chun-yong,LOU Hei,LüZhi-yong,et al.S Wave Crustal and Upper Mantle’s Velocity Structure in the Eastern Tibertan Plateau:Deep Environment of Lower Crustal Flow[J].Science in China:Series D(Earth Science),2008,38(1):22-32.(in Chinese)
[11]刘启民,赵俊猛,卢芳,等.用接收函数方法反演青藏高原东北缘地壳结构[J].中国科学:D辑(地球科学),2014,44(4):668-679.LIU Qi-min,ZHAO Jun-meng,LU Fang,et al.Crustal Structure of Northeastern Margin of the Tibetan Plateau by Receiver Function Inversion[J].Science China Earth Sciences:Series D(Earth Science),2014,44(4):668-679.(in Chinese)
[12]周民都.青藏高原东北缘深地震测深研究成果回顾[J].西北地震学报,2006,28(2):189-191.ZHOU Min-du.Review of Study on the Depth Seismic Sounding in the Northeastern Margin of Qinghai—Tibetan Plateau[J].Northwestern Seismological Journal,2006,28(2):189-191.(in Chinese)
[13]高见,张元生,郭飚,等.甘东南流动台阵微震检测结果[J].地震工程学报,2013,35(1):177-182.GAO Jian,ZHANGg Yuan-sheng,GUO Biao,et al.Microearthquake Location Determined by Portable Seismic Array Data in Southeast Gansu Province[J].China Earthquake Engineering Journal,2013,35(1):177-182.(in Chinese)
[14]Bensen G D,Ritzwoller M H,Barmin M P,et al.Processing Seismic Ambient Noise Data to Obtain Reliable Broad-band Surface Wave Dispersion Measurements[J].Geophysical Journal International,2007,169(3):1239-1260.
[15]Lin F C,Ritzwoller M H,Tomnend J,et al.Ambient Noise Rayleigh Wave Tomography of New Zealand[J].Geophy J Int,2007,170(2):649-666.
[16]姚华建,徐果明,肖翔,等.利用基于图像分析的双台面波相速度频散曲线快速提取方法[J].地震地磁观测与研究,2004,25(1):1-8.YAO Hua-jian,XU Guo-ming,XIAO Xiang,et al.A Quick Tracing Method based on Image Analysis Technique for the Determination of Dual Stations Phase Velocities Dispersion Curve of Surface Wave[J].Seismological and Geomognetic Observation and Research,2004,25(1):1-8.(in Chinese)
[17]Yao H J,Xu G M,Zhu L B,et al.Mantle Structure from Interstation Rayleigh Wave Dispersion and Its Tectonic Implication in Western China and Neighboring Regions[J].Phys Earth Planet Inter,2005,148(1):39-54.
[18]Cara M,Lévêque J.Waveform Inversion Using Secondary Observables[J].Geophys Res Lett,1987,14(10):1046-1049.
[19]Trampert J,Woodhouse J H.Global Phase Velocity Maps of Love and Rayleigh Waves between 40and 150Seconds[J].Geophys J Int,1995,122(2),675-690.
[20]Ekstr9m G,Tromp J,Larson E W.Measurements and Global Models of Surface Wave-propa Gation[J].J Geophys.Res.:Solid Earth(1978-2012),1997,115(B6).doi:10.1029/2008JB005787.
[21]Barmin M,Ritzwoller M,Levshin A.A Fast and Reliable Method for Sur-face Wave in Monitoring the Comprehensive Nuclear-Test-Ban Treaty:Surfac-e Waves[M].Levshin A L,Ritzwoller M,Springer-Verlag,2001:1351-1375.
[22]Ritzwoller M H,Shapiro N M,Barmin M P,et al.Global Surface Wave Diffraction Tomography[J].Geophys Res:Solid Earth(1978-2012),2002,107(B12),2335.doi:10.1029/2002JB001777.
[23]Fang H,Yao H,et al.Direct Inversion of Surface Wave Dispersion for Three-dimensional Shallow Crustal Structure Based on Ray Tracing:Methodology and Application[J].Geophysical Journal International,2015,201(3):1251-1263.
[24]Rawlinson N,Sambridge M.Wave Front Evolution in Strongly Heterogeneous Layered Media Using the Fast Marching Method[J].Geophysical Journal International,2004,156(3):631-647.
[25]Montagner J P.Regional There-dimensional Structures Using Long-period Surface Waves[J].Annales Geophy-sicae,1996,4(3):283-294.
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