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Two-step interface and velocity inversion—— Study o e of the Tangshan seismic region

Acta Seismologica Sinica(English Edition) 1998年第6期11卷 34-44页

作者： XIAO LING LAI XIAN KANG ZHANG XU YAO ZHENG Research Center of Exploration geophysics, china {2. {3., Zhengzhou 450003. china

This paper studies the computation method of two step inversion of interface and velocity in a region. The 3. D interface is described by a segmented incomplete polynomial; while the reconstruction of 3. D velocity is accomplished by the principle of least squares in functional space. The computation is carried out in two steps. The first step is to inverse the shape of 3. D interface; while the second step is to do 3. D velocity inversion by distributing the remaining residual errors of travel time in accordance with their weights. The data of seismic sounding in the Tangshan Luanxian seismic region are processed, from which the 3. D structural form in depth of the Tangshan seismic region and the 3. D velocity distribution in the crust below the Tangshan Luanxian seismic region are obtained. The result shows that the deep 3. D structure in the Tangshan seismic region trends NE on the whole and the structure sandwiched between the NE trending Fengtai Yejituo fault and the NE trending Tangshan fault is an uplifted zone of the Moho. In the 3. D velocity structure of middle lower crust below that region, there is an obvious belt of low velocity anomaly to exist along the NE trending Tangshan fault, the position of which tallies with that of the Tangshan seismicity belt. The larger block of low velocity anomaly near Shaheyi corresponds to a denser earthquake distribution. In that region, there is an NW trending belt of high velocity anomaly, probably a buried fault zone. The lower crust below the epicentral region of the Tangshan M S=7.8 earthquake is a place where the NE trending belt of low velocity anomaly meets the NW trending belt of high velocity anomaly. The two sets of structures had played an important role in controlling the preparation and occurrence o

关键词： two step interface and velocity inversion 3 D velocity pattern of crust below Tangshan seismic region seismicity zone

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ON THE APPLICATION OF SPHERICAL HARMONIC ANALYSIS OF GEOMAGNETIC FIELD TO A LOCAL REGION

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Chinese Science Bulletin 1985年第5期30卷 650-655页

作者：吴文京 institute of geophysics Stare Seismological Bureau Beijinghe spherical harmonic analysis of geomagnetic field gives a convenient mathematical form for its global distribution and by means of observations made on the earth's surface makes analytid continuations upwards to the entire free space and downwards into the earth. It makes possible the discrimination between the internal and external sources of the field and attributes physical significance to each term of the harmonic series.

The spherical harmonic analysis of geomagnetic field gives a convenient mathematical form for its global distribution and, by means of observations made on the earth’s surface makes analytid continuations upwards to the entire free space and downwards into the earth. It makes possible the discrimination between the internal and external sources of the field, and attributes physical significance to each term of the harmonic series.

关键词： LOCAL discrimination convenient spherical harmonic fitting distr inherent latter fitted

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1994年SK和763.LP）记录地震图缩微目录

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地震地磁观测与研究 1995年第5期16卷 66-70页

作者： Microfilm Group, institute of geophysics(institute of geophysics,State seismological bureau. beijing 100081, china) 国家地震局地球物理研究所

１９９４年ＳＫ和７６３（ＬＰ）记录地震图缩微目录地球物理研究所缩微组（中国北京１０００８１国家地震局地球物理研究所）地震图缩微工作，从１９９４年开始做了调整，改为同时承担全国基式地震仪台网中周期（ＳＫ）记录及全国７６... 详细信息

１９９４年ＳＫ和７６３（ＬＰ）记录地震图缩微目录地球物理研究所缩微组（中国北京１０００８１国家地震局地球物理研究所）地震图缩微工作，从１９９４年开始做了调整，改为同时承担全国基式地震仪台网中周期（ＳＫ）记录及全国７６３地震仪台网长周期（ＬＰ）记录的有...

关键词：地震图缩微目录地震台

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Confidence Evaluation of Medium-and Long-Term Earthquake Prediction by Use of the Analytical Hierarchy Process

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Earthquake Research in china 1996年第2期10卷 69-79页

作者： Wang Xiaoqing and Gao MengtanCenter for Analysis and Prediction, SSB, beijing 10003., china {2. of {3., SSB, beijing 100081, china

This paper offers an approach to the relative confidence level of medium- and long-term earthquake prediction methods by use of the analytical hierarchy process (AHP). We construct the criterion judgment matrices according to the results of an expert questionnaire known as the Delphi scheme. From the matrices we can obtain a scale for the relative preference or priority weight of each factor. The quantitative weights might be applied to make synthetic prediction of earthquake risk areas in the northern part of the North china seismic region.

关键词： Seismic analysis Confidence level Prediction version.

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Preliminary Study on Probabilistic Prediction of Seismic Hazard in a Period of 10 Years

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Earthquake Research in china 1995年第4期9卷 10-17页

作者： Gao Mengtan and Wang Jianinstitute of geophysics,SSB,{2. {3.,china

Many uncertainty factors need be dealt with in the prediction of seismic hazard for a 10-year *** by these uncertainties,the result of prediction is also uncertain to a certain extent,so the probabilistic analysis method of seismic hazard should be *** consideration of the inhomogeneity of the time,location,and magnitude of future earthquakes and the probabilistic combination of the background of long-term seismic hazard(geology,geophysical field,etc.)and the precursors of earthquake occurrence,a model of probabilistic prediction of seismic hazard in a period of 10 years s *** the inhomogeneity of data and earthquake precursors for different regions in china,a simplified model is also proposed in order to satisfy the needs of different regions around the country.A trial in North china is used to discuss the application of the *** method proposed in this paper can be used in the probabilistic prediction of seismic hazard in a period of 10 *** to

关键词： probability model medium-term prediction

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Seismic Zoning Methods That Assume Spatially Non-Uniform Earthquake Distribution in the Potential Source:Their Application to Western Panzhihua and Central and Southern Shanxi Province

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Earthquake Research in china 1997年第4期11卷 81-88页

作者： Gao Mengtan and Xu Guangyininstitute of geophysics,SSB,{2. {3.,china

Based on the models of non-uniform earthquake distribution in the potential source,the seismic zonation of Western Panzhihua and Central and Southern Shanxi Province is *** results show that the usual uniform distribution model may underestimate the seismic risk and result in a reduction of the areas of high *** influence of each non-uniform probabilistic distribution method on the result of seismic zoning is discussed.

关键词： seismic zonation probabilistic nonhomogeneous distribution.

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The K Method for Estimating Earthquake Activity Parameters and Effect of the Boundary Uncertainty of the Source Region:Discussion on the Seismic Zoning Method

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Earthquake Research in china 1997年第3期11卷 75-81页

作者： Huang Yurui and Zhang Tianzhonginstitute of geophysics,SSB,{2. {3.,china

Two aspects of a new method,which can be used for seismic zoning,are introduced in this *** the one hand,the approach to estimate b value and annual activity rate proposed by Kijko and Sellevoll needs to use the earthquake *** existing earthquake catalogue contains both historical and recent instrumental data sets and it is inadequate to use only one *** the large number of historical events with recent complete records and taking the magnitude uncertainty into account,Kijko’s method gives the maximum likelihood estimation of b value and annual activity rate,which might be more *** the other hand,this method considers the source zone boundary uncertainty in seismic hazard analysis,which means the earthquake activity rate across a boundary of a source zone changes smoothly instead of abruptly and avoids too large a gradient in the calculated results.

关键词： The K Method for Estimating Earthquake Activity Parameters and Effect of the Boundary Uncertainty of the Source Region Source Activity

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Physics of Seismic Source Ⅲ. Statistical Mechanics of Earthquakes

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Earthquake Research in china 1999年第2期13卷 41-52页

作者： Chen Yuntai and Wu Zhonglianginstitute of geophysics, CSB,{2.,{3.

The statistical mechanics of earthquakes adopts the concepts and methodology of statistical mechanics, especially the theory of critical phenomena, in studying the preparation, initiation, propagation and healing of earthquake rupture, which forms a new branch in the physics of seismic source in recent years. This article introduces to the fundamental concepts of the statistical mechanics of earthquakes. The introduction includes the seismic Hamiltonian, percolation model, earthquake rupture nucleation, and Burridge-Knopoff spring-block model. It is pointed out that some of the statistical mechanical models of earthquakes have a sound seismological basis. There is a smooth "transition" from the "classical" theory to the "modern" theory of seismic source.

关键词： Critical phenomena Percolation model Earthquake nucleation Burridge-Knopoff model

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MICROSCOPIC MECHANISM OF STRENGTH REDUCTION OF ROCKS

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Science china Chemistry 1989年第2期32卷 205-214页

作者：姚孝新赖德伦张来凤 institute of geophysics State Seismological Bureau Beijing

Uniaxial compression tests have been conducted on Jinan gabbro at six different axial strain rates ranging from 10^(-8)/s to 10^(-3./s. Results show that the strength decreases by about 2.% with decreasing strain rate. The stress level C_0~' /or the onset of dilatancy is constant for six strain rates. When σ_1>C_o~' ε_1 and D increase with decreasing strain rate (?) under a specific stress *** observations on the stressed rock samples reveal that the density of microcracks for the samples loaded at low strain rates is higher than that at high strain rates; in addition there are also cracks nearly perpendicular to it, which is responsible for the increase of D *** creep test under the stress σ_(σ_1>C_0~') confirms that the growth of microcracks in the rock has been time-dependent effects, and the steady-state creep with (?)=constant developed until the rock *** up the above reslts shows that when σ>C_0~', the constitution law of the rockswill be time-dependent, and the C_0~' value is a limit of the rocks strength.

关键词： strain rate creep time-dependent onset of dilatancy.

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1996年地震趋势研究──地震预报推进组

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地震地磁观测与研究 1996年第1期 2-14页

作者： Research group for promoting earthquake prediction(institute of geophysics, State {2. {3., beijing 100081,china) 国家地震局地球物理研究所

１９９６年地震趋势研究──地震预报推进组（中国北京１０００８１国家地震局地球物理研究所）为不断加强全国年度趋势研究的科学性和严谨性，注重震情的综合分析，本报告重点作了以下５大部分的论证：１９９５年度的预测检验与回顾；... 详细信息

１９９６年地震趋势研究──地震预报推进组（中国北京１０００８１国家地震局地球物理研究所）为不断加强全国年度趋势研究的科学性和严谨性，注重震情的综合分析，本报告重点作了以下５大部分的论证：１９９５年度的预测检验与回顾；全球地震活动大形势的研究；我国各主...

关键词：日本海沟地震趋势地震预报地震带地震构造带全球地震活动小震活动地震活动性中强地震震级测定前兆震群首都圈菲律宾板块国家地震局地球物理研究所小震群

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