高密度电阻率法在三星堆壕沟考古勘探中应用研究   总被引：21，自引：12，他引：9       下载免费PDF全文

苏永军  王绪本  罗建群 《地球物理学进展》2007,22(1):268-272

三星堆遗址文化从新石器时代晚期延续发展至商末周初,延续时间近2000年,是迄今在西南地区发现的范围最大、延续时间最长、文化内涵最丰富的古城、古国、古蜀文化遗址,对三星堆遗址文明的溯源、遗址的发掘研究都具有重要意义.本文是利用高密度电阻率法勘探三星堆壕沟,其研究成果与壕沟情况十分吻合.  相似文献   

场地地震效应及其预测的某些考虑          下载免费PDF全文

蒋溥 《地震地质》1989,11(1):101-114

本文从场地地震危险性评价,地震危险性概率分析、场地地震工程地质单元划分、地震反应分析、活断层工程分类等五个方面、论述场地地震效应及其预测中基本原理和方法。根据工程地震危险性评价和分析、地震小区划等地震工程实践,对场地地震效应及其预测提供一些基本考虑和经验  相似文献   

地震烈度与竖向地震动峰值的转换     

李大华 《地震研究》1991,14(2):147-151

本文基于笔者采用过的同时考虑房屋层数和场地类别时烈度到水平向地面峰值转换的基本思路,统计研究了烈度与竖向地面峰值的对应关系,明确指出了不同烈度下竖向与水平向峰值的比值应该是有所不同的,并给出了建议的比值,给果可供一般工程抗震设计参考使用。  相似文献   

Site response using coda-wave techniques: Applications to short period data from central and southern Italy     

Edoardo Del Pezzo  Marcello Martini  Giuliano Milana 《Pure and Applied Geophysics》1991,136(1):127-141

The method of coda waves was applied to two different sets of data for the evaluation of the relative site response.The first set of data consists of low magnitude earthquakes with closely spaced locations, recorded at a small aperture array of velocimeters located in the Abruzzo region, central Italy. The second set of data is composed of events with epicentral distance ranging from 20 to 300 km, recorded at a seismological network with an aperture of about 100 km located in the Puglia region, southern Italy.Results show that the coda wave method furnishes stable estimates of the site effect. An amplification, relative to an arbitrary site, of a factor of about 2 occurs in the 1.7–6 Hz frequency band for two stations of the Abruzzo network, while an amplification factor of about 0.5 occurs in the whole frequency band (1–24 Hz) for one of the stations of the Puglia network. This station is located in an area which is correlated with a low macroseismic intensity anomaly.  相似文献   

我国现行抗震设计规范中场地评定方法的比较和评述   总被引：1，自引：0，他引：1  

刘曾武  魏培恒 《地震工程与工程振动》1995,15(4):118-130

目前，我国抗震设计规范中采用的场地评定方法主要有两种：一是建筑抗震设计规范（ＧＢＪ１１－８９）采用的场地分类的方法，一是构筑物抗震设计规范（ＧＢ５０１９１－９３）和电力设施抗震设计规范采用的场地指数法。前者是把场地影响按照场地分类指标划分成若干场地类别，因此，确定的地震荷载是不连续的，跳跃变化的。后者是一种以模糊推论的综合评判方法导出的场地指数为指标进行连续评定的新方法，在这种方法里，场地性质的差  相似文献   

Application of horizontal-to-vertical (H/V) Fourier spectral ratio for analysis of site effect on rock (NEHRP-class B) sites in Taiwan   总被引：1，自引：0，他引：1  

Vladimir Yu. Sokolov  Chin-Hsiung Loh  Wen-Yu Jean   《Soil Dynamics and Earthquake Engineering》2007,27(4):314-323

The frequency-dependent amplification for rock (NEHRP-class B) sites was studied using earthquake ground-motion database collected in Taiwan during implementation of the Taiwan Strong Motion Instrumentation Program. The database used includes several hundred records from earthquakes of M_L 4.0–7.3 occurred between 1993 and 2004. The characteristics of amplification were evaluated using the well-known technique of horizontal-to-vertical Fourier spectral ratio (H/V) of the S-wave phase [Lermo J, Chavez-Garcia FJ. Site effect evaluation using spectral ratios with only one station. Bull Seism Soc Am 1993;83:1574–94]. The study allows us to analyze peculiarities of rock sites amplification in Northern and Eastern Taiwan. It was suggested to divide the NEHRP-class B site amplification into four types based on frequency of maximum amplification and the shape of amplification function. The applicability of the technique was also checked for a few stiff and soft soil sites (NEHRP-classes D and E).  相似文献   

Seismicity, seismic input and site effects in the Sahel—Algiers region (North Algeria)   总被引：2，自引：0，他引：2  

A. Harbi  S. Maouche  F. Vaccari  A. Aoudia  F. Oussadou  G.F. Panza  D. Benouar 《Soil Dynamics and Earthquake Engineering》2007,27(5):427-447

Algiers city is located in a seismogenic zone. To reduce the impact of seismic risk in this Capital city, a realistic modelling of the seismic ground motion (SGM) is conducted by using the hybrid method that combines the finite differences method and the modal summation. For this purpose, a complete database of geological, geophysical and earthquake data is constructed. A critical re-appraisal of the seismicity of the zone [2.25°E–3.50°E, 36.50°N–37.00°N] is performed and an earthquake list, for the period 1359–2002, is compiled. The analysis of existing and newly retrieved macroseismic information allowed the definition of earthquake parameters of macroseismic events for which a degree of reliability is assigned. Geological cross sections have been built up to model the SGM in the city, caused by the 1989 Mont-Chenoua and the 1924 Douéra earthquakes. Synthetic seismograms and response spectral ratio is produced for Algiers, and they show that the soft sediments in Algiers centre are responsible of the noticed amplification of the SGM.  相似文献   

Inferred ground motions on Guadeloupe during the 2004 Les Saintes earthquake     

John Douglas 《Bulletin of Earthquake Engineering》2007,5(3):363-376

Accurate estimates of the ground motions that occurred during damaging earthquakes are a vital part of many aspects of earthquake engineering, such as the study of the size and cause of the uncertainties within earthquake risk assessments. This article compares a number of methods to estimate the ground shaking that occurred on Guadeloupe (French Antilles) during the 21st November 2004 (M _w 6.3) Les Saintes earthquake, with the aim of providing more accurate shaking estimates for the investigation of the sources of uncertainties within loss evaluations, based on damage data from this event. The various techniques make differing use of the available ground-motion recordings of this earthquake and by consequence the estimates obtained by the different approaches are associated with differing uncertainties. Ground motions on the French Antilles are affected by strong local site effects, which have been extensively investigated in previous studies. In this article, use is made of these studies in order to improve the shaking estimates. It is shown that the simple methods neglecting the spatial correlation of earthquake shaking lead to uncertainties similar to those predicted by empirical ground-motion models and that these are uniform across the whole of Guadeloupe. In contrast, methods (such as the ShakeMap approach) that take account of the spatial correlation in motions demonstrate that shaking within roughly 10 km of a recording station (covering a significant portion of the investigated area) can be defined with reasonable accuracy but that motions at more distant points are not well constrained.  相似文献   

吉林红石蓄能电站区域稳定性研究     

高常波  钟以章  万波  谷晓曦 《东北地震研究》2001,17(1):9-17

以有关规范为基础，分别从区域、近区域和场址区三个尺度对吉林红石蓄能电站场址的稳定性作了评价。从地质构造、新构造、火山、地震等方面来分析，区域和近区域均是稳定的，场址区内虽有5条断裂构造发育并有发生轻微崩塌和泥石流等灾害的可能，但不会对场址产生的影响，因而场址区也是稳定的。  相似文献   

场地土的随机地震反应分析   总被引：10，自引：0，他引：10  

门玉明  黄义  刘增荣 《工程地质学报》2001,9(1):68-73

研究了剪切模量随深度呈线性变化时场地土的随机地震反应分析方法, 分别建立了基岩输入地震动加速度功率谱函数为白噪声和过滤白噪声时场地土的随机地震反应分析理论。  相似文献