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Teleseismic body waves extracted from ambient noise cross correlation between F-net and Chin Array phase Ⅱ

Earthquake Research Advances 2022年第1期2卷 33-43页

作者： Lin Deng Weitao Wang Fang Wang Songyong Yuan Institute of Geophysics China Earthquake AdministrationBeijing100081 Key Laboratory of Earthquake Source Physics China Earthquake AdministrationBeijing100081

The vertical-vertical noise cross-correlation functions(NCFs)between two seismic arrays,the Japan F-net and Chin Array phase Ⅱ,are calculated using continuous recordings during *** array interferometry to obtain bin stacked NCFs,clear body waves are retrieved at different period *** direct P waves for distance 15-40 degrees are observed between short period 3-10 s while core reflected PcP/ScS waves are more obvious for longer period 30-60 *** signal-to-noise-ratio(SNR)of the short period P waves reaches its highest point with bin widths around 20 km while SNRs of PcP and ScS increase slowly with bin *** those body waves demonstrate clear directivity with strong signals traveling from the *** time-lapse SNR variations for the PcP and ScS show correlation with the occurrence of major earthquakes,while the P-wave SNR demonstrates seasonal variations with additional contribution from major *** present results suggest teleseismic body waves can be retrieved through bin stacking,though further processing is still necessary to obtain finer waveforms such as P wave triplications.

关键词： Noise cross correlation body waves Array interferometry ChinArray

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Lithospheric thickness and upper-mantle deformation beneath the NE Tibetan Plateau inferred from S receiver functions and SKS splitting measurements

Lithospheric thickness and upper-mantle deformation beneath ...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Hongshuang Zhang Jiwen Teng Xiaobo Tian Zhongjie Zhang Rui Gao Jiaqi Liu Institute of Geology Chinese Academy of Geological Sciences Institute of Geology and Geophysics Chinese Academy of Sciences

We present S receiver functions and SKS splitting measurements from the China Seismograph Network located in the Qinghai and Gansu *** data are used to interpret the structure of the lithosphere-asthenosphere boundary(LAB) and upper-mantle deformation beneath the northeastern Tibetan Plateau(NETP) in regions north of the east Kunlun Fault. Based on our observations,the LAB lies at a depth of 125-135 km beneath the northeastern Songpan-Ganzi block and the west Qinling orogen,between 145 and 175 km beneath the Kunlun and Qilian orogen,and deepens below the Qaidam Basin(175-190 km),Ordos Craton (170 km) and Alashan platform(200 km).The NETP is characterized by a nearly uniform fast NW-SE 5-wave *** observations are different from those to the south of the Kunlun Fault where fast S directions are rotating clockwise from the inner *** change in fast directions across the Kunlun Fault implies a sudden variation of upper-mantle *** wave splitting delay times vary from 0.8 to 1.9 *** from beneath regions north of the Kunlun-Ayimaqin suture showed that delay time was positively correlated with lithospheric thickness with an increase of 0.7 s per 100 *** indicates that the anisotropy may develop in the uppermost mantle,such as the lithosphere,beneath the NETP.

关键词： body waves Seismic anisotropy Continental tectonics:extensional Dynamics of lithosphere and mantle

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Structure-preserving modelling of elastic waves:a symplectic discrete singular convolution differentiator method

Structure-preserving modelling of elastic waves:a symplectic...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Xiaofan Li Wenshuai Wang Mingwen Lu Meigen Zhang Yiqiong Li Key Laboratory of the Earth’s Deep Interior CASInstitute of Geology and GeophysicsChinese Academy of Sciences

In this paper,we introduce the so-called symplectic discrete singular convolution differentiator (SDSCD) method for structure-pre serving modelling of elastic *** the method presented, physical space is discretized by the DSCD,whereas an explicit third-order symplectic scheme is used for the time *** approach uses optimization and truncation to form a localized *** preserves the fine structure of the wavefield in complex media and avoids non-causal interaction when parameter discontinuities are present in the ***, the approach presented is a structure-preserving ***,some numerical experiments are shown in this *** wavefield modelling experiments on a laterally heterogeneous medium with high parameter contrasts demonstrate the superior performance of the SDSCD for suppression of numerical ***-term computational experiments exhibit the remarkable capability of the approach presented for long-time simulations. Promising numerical results suggest the SDSCD is suitable for high-precision and long-time numerical simulations,as it has structure-preserving property and it can suppress effectively numerical dispersion when coarse grids are used.

关键词： Numerical solutions Numerical approximations and analysis body waves Computational seismology Wave propagation

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SKS splitting measurements with horizontal component misalignment

SKS splitting measurements with horizontal component misalig...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Xiaobo Tian,~1 Jianli Zhang,~1 Shaokun Si,~1 Jingbo Wang,~2 Yun Chen~1 and Zhongjie Zhang~1 1 State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China. 2 Lawrence Livermore National Laboratory,7000 East Ave L-231,Livermore,CA 94550,USA

SUMMARY The measurement of SKS splitting parameters is widely used for the study of deformation in the upper mantle,but the misalignment of the station horizontal components,for example misorientation of the sensors,may result in false *** this paper,we suggest that the splitting analysis should be repeated with different assumed angles of misalignment. Two criteria can be applied to correct the measurement of the SKS splitting parameters: (1) the horizontal rotating angle should produce the global minimum transverse energy,as determined using the least transverse energy method;(2) there should be consistent results between the least transverse energy method and the minimum eigenvalue *** tests show that the method is suitable for complex anisotropy models,such as two-layer anisotropy.

关键词： Broad-band seismometers body waves Seismic anisotropy Computational seismology

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Crustal Lg attenuation within the North China Craton and its surrounding regions

Crustal Lg attenuation within the North China Craton and its...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Lian-Feng Zhao Xiao-Bi Xie Wei-Min Wang Jin-Hai Zhang Zhen-Xing Yao Key Laboratory of the Earth's Deep Interior Institute of Geology and GeophysicsChinese Academy of Sciences Institute of Geophysics and Planetary Physics University of CaliforniaSanta CruzCA 95064USA Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of Sciences

We report on a broad-band high-resolution attenuation model for the North China Craton and surrounding regions based on regional Lg-wave *** broad-band waveforms recorded at 39 stations from 176 crustal earthquakes are collected to extract the Lg-wave amplitude spectra between 0.05 and 10.0 *** use the dual-station method to generate a preliminary Q model and use it as the initial ***,we combine the dual- and single-station data together to jointly invert the Q distribution and Lg source excitation *** inversions are conducted independently at individual frequencies without using any a priori assumption about the frequency dependences in Q and source *** maximum spatial resolution is approximately 1°x 1°in well-covered areas for frequencies between 0.05 and 2.0 *** Q image is then used to determine the relationship between the attenuation and different geological *** show an average go(1 Hz Q) of 374 for the entire North China Craton with an increasing trend from east to *** go values are 337,361 and 421 for the east,central and west blocks,*** the surrounding regions,the Eastern Tibetan plateau has a very low go of 188,while the Northeast China Plate and the Tianshan-Xingmeng fold belts are characterized by high go values of 506 and 424, respectively We also investigate regional variations of the Lg attenuation in low-frequency band between 0.2 and 1.0 Hz.

关键词： body waves Seismic attenuation Seismic tomography Crustal structure

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Crustal thickness and Vp/Vs ratio of the central and western North China Craton and its tectonic implications

Crustal thickness and Vp/Vs ratio of the central and western...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Zigen Wei,Ling Chen and Weiwei Xu State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China.

SUMMARY We obtained the crustal thickness(H) and average Vp/Vs ratio(κ) for the central(CNCC) and western North China Craton(WNCC) by H-κstacking of receiver *** results show that H andκvaries significantly but similarly in the northern and southern CNCC,reflecting possible effects of the Phanerozoic cratonotic reactivation on the *** the WNCC,the south is featured byκvalues typical for Precambrian shields(～1.77) and variations of H mirroring surface topography;the north presents large fluctuations ofκ(1.68-1.93) and a crustal thickening(up to 50 km) uncorrelated with *** N-S differences were thought to be associated with a～1.95-Ga suturing event occurred in the north with little effects on the *** observations suggest that distinct structural heterogeneities of the NCC not only reflect diverse regional tectonics in Phanerozoic,but also provide evidence for long-term survival of crustal fabrics in stable continental interior.

关键词： body waves Cratons Crustal structure Asia

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