快速有限震源分析和近断层强地面运动:应用于2003年圣西蒙M_w6．5和2004年帕克菲尔德M_w6．0级地震

引言 近断层强地面震动的快速描述（或刻划）是评估地震影响包括破坏和损失规模的基础工作。震动图（ShakeMap；见Wald et al，1999a）是为此目的而研制的一种手段。为了生成震动图，所观测的峰值和谱地面运动，以及仪器测定的烈度（Wald et al，1999b），

元坝气田压缩机组高震动故障研究与分析

元坝气田增压工程于2015年3月30日投产。增压主要功能为:上游元坝净化厂来气经已建过滤、计量装置后,进入扩建增压装置,经增压、冷却后进入外输管线经平昌分输站、普光首站,输往川气东送干线。全站采用自控系统进行数据采集和监控,主要完成站内增压工艺数据采集、监视、控制等功能,并参与SIS安全连锁系统联动。

可控震源采集资料质量控制方法

随着大吨位可控震源的推广和应用,可控震源已广泛应用于地震资料采集作业,但可控震源自身的特点决定了在可控震源资料采集过程中对震源技术指标及采集资料进行全程监控,加强质量控制显得尤为重要,是获得高品质采集资料的根本保障。

鲜水河断裂带地震破裂段落的边界特征研究

作为“位于亚洲大陆东南部强烈变形场中的左旋剪切破裂带，撕裂了高耸的青藏高原的东南部边缘，在中国大陆内部新构造格局中占据着突出位置”的青藏高原东缘一条重要的左旋走滑断裂带，鲜水河断裂带有着丰富的历史地震记录、较清晰的地貌特征和地表破裂形迹，是开展活动断裂定量研究、检验地震破裂分段模型——独立破裂模型和级联破裂模型的理想场所，

Improved seismoacoustic analysis model and its application to source parameter inversion of near-surface small-yield chemical explosions

The seismoacoustic analysis method has broad potential applications to source parameter estimation for near-surface explosion events such as industrial explosions and terrorist attacks.In this study,current models were improved by modifying the acoustic model and adopting the Bayesian Markov-chain-Monte-Carlo inversion method.The source parameters of near-surface small-yield chemical explosions were analyzed via the improved seismoacoustic analysis model and by the estimation accuracy of seismoacoustic joint inversion.Estimation and analysis results showed that the improved seismoacoustic analysis model considered ground shock coupling and the impact of explosion products ejecting from the surface so that the improved acoustic impulse relation was more consistent with the measured data than the Ford impulse relation.It is suitable for deep-burial,shallow-burial,and near-surface aerial explosions.Furthermore,trade-off relationships were declined through the application of the improved model to source parameter inversion for near-surface small-yield chemical explosions,and source parameter estimation accuracy was improved.

Research on the Probability of Earthquake Occurrence in the Daduhe Drainage Area

This paper applies the Seismic Hazard Analysis method for the cities of China to research on the probability of earthquake occurrence in the Daduhe drainage area,where the cascade dam system is located.This research is based on the potential seismic source scheme of the Seismic Ground Motion Parameter Zonation Map of China(2001),and uses Poisson distribution as an earthquake occurrence model.Earthquake magnitude obeys truncated exponential distribution.The spatial distribution function of the potential seismic source zone is taken as the first-class spatial probability distribution,and the homogeneous probability distribution in the potential seismic source zone as the second-class spatial probability distribution.Considering the seismic intensity attenuation relationship of western China,we compute the occurrence probability of an earthquake around magnitude 6.0(5.5～6.5),7.0(6.5～7.5)and over 7.5 in the Daduhe drainage area,where 22 series cascade dams will be built.The results can be used for hydropower plant planning,hydropower dam site selection and seismic fortification.

Theoretical Error Analysis of the Accuracy of Focal Depth Determination of Near Earthquakes

Focal depth is one of the most difficult seismic parameters to determine accurately in seismology. The focal depths estimated by various methods are uncertain to a considerable degree, which affects the understanding of the source process. The influence of various factors on focal depth is non-linear. The influence of epicentral distance, arrival time residual and velocity model （crust model） on focal depth is analyzed based on travel time formula of near earthquakes in this paper. When wave propagation velocity is constant, the error of focal depth increases with the increase of epicentral distance or the distance to station and the travel time residual. When the travel time residual is constant, the error of focal depth increases with the increase of the epicentral distance and the velocity of seismic wave. The study also shows that the location error perhaps becomes bigger for shallower earthquakes when the velocity is known and the travel time residual is constant. The horizontal error caused by location accuracy increases with the increase of the epieentrai distance, the travel time residual and the velocity of seismic waves, thus the error of focal depth will increase with these factors. On the other hand, the errors of focal depth will lead to change of the origin time, therefore resultant outcomes will all change.

Study on the Source Parameters of the Barkam Earthquake Sequence

Using digital wave data recorded by the Barkam station, source parameters for 93 earthquakes with ML2.5 - 5.0 in the Barkam area are determined by spectral analysis. PreHmiuary analysis of the source parameters show that there is a high correlation between seismic moment Mo and local scale ML, which is lgtoMo = 0.92ML ＋ 10.24,correlation coefficient R is 0.86; Investigation of the relationship between stress drop and local scale ML indicates that the stress drop seems to be independent of ML.

Earthquake Damage Analysis of M_S 4.9 Earthquake at the Juncture of Gaoyou and Baoying, Jiangsu Province

Based on the network monitoring data and field investigations,the basic characteristics of the M S4.9 earthquake at the juncture of Gaoyou and Baoying in Jiangsu Province on July20,2012 have been introduced,and the focal mechanism solutions have also been obtained.According to the regional tectonic features and site macroscopic survey,the occurrence of the earthquake was probably related to the Yangchacang-Sangshutou fault.Based on site survey data,both the evaluation criterion of seismic intensity of this region and the seismic intensity maps have been proposed.According to the damage characteristics of brick-concrete structure and brick-wood structure,the main reasons of serious damage for buildings are poor foundation conditions,low seismic bearing capacity,poor quality of construction and disrepair.Considering the differences of earthquake damage in the different regions,advice on accelerating the new rural construction,improving the resistance against earthquake disasters of rural residential areas and strengthening the seismogenic research on strong and moderate size earthquake is proposed,which will be possibly helpful for earthquake damage survey,prediction and prevention.

Relocation and Genetic Analysis of Earthquakes in the West of Xietan Area of Three Gorges Reservoir

136 earthquakes,taking place in the west of Xietan area,recorded by portable stations deployed in the Three Georges reservoir area were relocated using the double difference algorithm.The relocations show that the root-mean-square deviations of the relocations in the directions of E-W,N-S and U-D are 0.38km,0.33km and 0.98km,respectively.The earthquakes in clasolite area with focal depths of about 4km～5km take on linear distributions from the shallow to deep parts.These earthquakes were deduced to be reservoir-induced earthquakes of fault fracture type.In contrast,the earthquakes in limestone pavement with the focal depths about 2km～3km take on slightly divergent distributions and have the characteristics of reservoir-induced earthquakes of the karst collapse type.