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s-wave velocity structure in Tangshan earthquake region and its adjacent areas from joint inversion of receiver functions and surface wave dispersion

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Earthquake science 2020年第1期33卷 42-52页

作者： Yanna Zhao Yonghong Duan Zhuoxin Yang Zhanyong Gao Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China

Using the seismic records of 83 temporary and 17 permanent broadband seismic stations deployed in Tangshan earthquake region and its adjacent areas(39°N–41.5°N,115.5°E–119.5°E),we conducted a nonlinear joint inversion of receiver functions and surface wave *** obtained some detailed information about the Tangshan earthquake region and its adjacent areas,including sedimentary thickness,Moho depth,and crustal and upper mantle s-wave ***,we also obtained the vP/vs structure along two sections across the Tangshan *** results show that:(1)the Moho depth ranges from 30 km to 38 km,and it becomes shallower from Yanshan uplift area to North China basin;(2)the thickness of sedimentary layer ranges from 0 km to 3 km,and it thickens from Yanshan uplift region to North China basin;(3)the s-wave velocity structure shows that the velocity distribution of the upper crust has obvious correlation with the surface geological structure,while the velocity characteristics of the middle and lower crust are opposite to that of the upper *** with the upper crust,the heterogeneity of the middle and lower crust is more obvious;(4)the discontinuity of Moho on the two sides of Tangshan fault suggests that Tangshan fault cut the whole crust,and the low vs and high vP/vs beneath the Tangshan earthquake region may reflect the invasion of mantle thermal material through Tangshan fault.

关键词： Tangshan earthquake region joint inversion surface wave dispersion receiver functions s-wave velocity

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Determination of the crustal structure and seismicity of the Linfen rift with s-wave velocity mapping

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Frontiers of Earth science 2020年第3期14卷 647-659页

作者： Zigen Wei Risheng Chu Meiqin song Xiaolin Yang shanshan Wu Feng Bao state Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430077China Earthquake Administration of shanxi Province Taiyuan030021China shaanxi Earthquake Agency Xi’an710068China shanghai Earthquake Agency Shanghai200062China

The Linfen rift is a Cenozoic extensional rift with significant seismicity and seismic *** of this rift shed light on deep dynamic processes and seismogenic mechanisms relevant to crustal structure and seismic *** first conducted a joint inversion of receiver functions and surface wave dispersion on waveform data collected from 27 broadband seismic stations to image the crustal s-wave velocity in the Linfen rift and its *** then relocated the source parameters for 10 earthquake events with depths>20 km and studied the relationship between crustal s-wave velocity and *** results show that low-velocity zones of different scales exist in the middle-lower crust,and that the depth of the seismogenic layer gradually increases from^25 km in the south to^34 km in the north,roughly corresponding to the bottom of the low-velocity *** found that most of the relocated earthquakes occurred in the low-velocity zone at depths of 18 km to 34 km,with the deepest at 32 *** of the greatest historic earthquakes,Linfen(Ms 7.75)in 1695 and Hongtong(Ms 8.0)in 1303,occurred at the bottom of the high-velocity zone at depths of 12 km to 18 *** results,combined with previous studies,suggest that the upwelling mantle material below the rift did not remarkably affect the velocity structure from the bottom of the seismogenic layer down to the uppermost mantle nor heat the *** is likely that neither crustal-scale faults nor mantle earthquakes exist in the Linfen rift.

关键词： Linfen rift joint inversion s-wave velocity seismogenic layer deep crustal earthquake

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A modified normalized input-output minimization (Mod-NIOM) method for seismic wave propagation modeling

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 481-491页

作者： santa Man shrestha Hideji Kawakami Eric Augustus Tingatinga Hidenori Mogi Department of Civil and Environmental Engineering Saitama University Geosphere Research Institute Saitama University Institute of Civil Engineering University of the Philippines Diliman

A new method for wave propagation modeling is introduced in this paper. By using the constraint optimization （Lagrange multiplier） method, the sum of weighted squared Fourier amplitudes is minimized when subjected to a constraint. The sum of the maximum amplitudes obtained from all output models is normalized to unity and is taken as a constraint. In this method, all the actual time histories are considered as outputs and dealt with equally. Independently of the combinations of time histories （or the first time history selected） during the analysis, the method captures the relationship of actual time histories by showing clear peaks. This paper describes the formulation of the models and illustrates the advantage of this method over the normalized input-output minimization （NIOM） method. The Mod-NIOM is then used to analyze the time histories of the Hyogoken-nanbu earthquake recorded at the Port Island vertical array site in Kobe, which suffered from liquefaction caused by the strong motions during the main shock. This method showed good correlations between the observed time histories at the site even though the surface time history was greatly modified by the liquefaction.

关键词： wave propagation constraint optimization s-wave velocity liquefaction amplification vertical array Hyogoken-nanbu earthquake

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Analysis　of　the　rising　and　sinking　movement　of　the　crust　in　Qinghai－Xizang　Plateau，China

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Acta seismologica sinica(English Edition) 1994年第1期7卷 105-115页

作者：吕梓龄庄真傅竹武胡家富宋仲和陈国英安昌强陈立华 Department of Geosciences Yunnan University Kunming China Institute of Geophysics State Seismological Bureau Beijing China

The average swelling height of Qinghai-Xizang Plateau(Tibet) is about 4.1 *** area is about 2 300 000 *** is the highest and the largest plateau in the *** Qomolangma,the highest peak in the world,is located in the southern fringe of the plateau,and its height is still *** is the driving force for the rising of the Qinghai-Xizang plateau?How high will the plateau still rise from now on? These questions are much concerned by *** this paper the distribution of the pressure at different depths in the region of Qinghai-Xizang Plateau are derived according to the three-dimensional structures of the s-wave velocity in the crust and upper *** crust and upper mantle structures of the Qinghai-Xizang Plateau is deliberated on the basis of the distribution with a comprehensive analysis on the rock types,earthquakes and the relative crust *** the two questions raised above are discussed.

关键词： s-wave velocity density relative pressure rising and sinking movement

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