反射系数K法在地质灾害评价中的应用   总被引：1，自引：0，他引：1  

陈绍求 《物探与化探》1998,22(4):304-308316

应用电阻率测深法探测滑坡和塌陷,采用反射系数K法区分滑坡和塌陷的类型和性质,正确地评价地质灾害,为治理工作提供快速准确的地质依据。  相似文献   

探地雷达应用中的几个基本问题   总被引：13，自引：0，他引：13  

雷林源 《物探与化探》1998,22(6):408-414

本文讨论了探地雷达(GPR)应用中的四个基本问题:(1)电磁波在地层中传播的波阻抗;(2)电磁波在地层分界面上场强的反射系数与透射系数;(3)电磁波在地层中的传播速度和反射波相位;(4)GPR的探测深度。为GPR的资料解释工作提供一定的理论依据和方法,也会促进资料解释的研究和发展。  相似文献   

Study on fine structure of crust-mantle transition zone in Yanqing-Hailai basin based on CDP and DSS data     

成瑾  李清河 《地震学报(英文版)》1998,11(1):81-88

ＳｔｕｄｙｏｎｆｉｎｅｓｔｒｕｃｔｕｒｅｏｆｃｒｕｓｔｍａｎｔｌｅｔｒａｎｓｉｔｉｏｎｚｏｎｅｉｎＹａｎｑｉｎｇＨａｉｌａｉｂａｓｉｎｂａｓｅｄｏｎＣＤＰａｎｄＤＳＳｄａｔａＪＩＮＣＨＥＮＧ１）（成瑾）ＱＩＮＧＨＥＬＩ２）（李清河）１）Ｉｎ...  相似文献   

scattering and refracting of plane strain wave by a cylindrical inclusion in fluidsaturated soils   总被引：1，自引：0，他引：1  

胡亚元  王立忠  陈云敏  吴世明  张忠苗 《地震学报(英文版)》1998,(3)

ＳｃａｔｅｒｉｎｇａｎｄｒｅｆｒａｃｔｉｎｇｏｆｐｌａｎｅｓｔｒａｉｎｗａｖｅｂｙａｃｙｌｉｎｄｒｉｃａｌｉｎｃｌｕｓｉｏｎｉｎｆｌｕｉｄｓａｔｕｒａｔｅｄｓｏｉｌｓＹＡＹＵＡＮＨＵ（胡亚元）ＬＩＺＨＯＮＧＷＡＮＧ（王立忠）ＹＵＮＭＩＮＣＨ...  相似文献   

New seismic images of the crust in the central Trans-Hudson Orogen of Saskatchewan     

B.I Pandit  Z Hajnal  M.R Stauffer  J Lewry  K.E Ashton 《Tectonophysics》1998,290(3-4):211-219

A reprocessing program to enhance the correlation between the surface geology and the seismic data has been completed for seismic line 9 (eastern 100 km) and line 10 in the central region of the Trans-Hudson Orogen of Saskatchewan, Canada. The new seismic images through lateral continuity of reflectivity provide sufficient detail to resolve the discrepancy between the low-dipping, layer-parallel and dextral-reverse nature of the Sturgeon-Weir shear zone (line 9) observed in the field and its steeply dipping (apparent) normal displacement character interpreted on the basis of the initial processing. Furthermore, the new interpretation provides a strong confirmation of the role of Pelican Thrust as a major detachment zone — the main `sole thrust' — along which juvenile allochthons have been carried across the Archaean microcontinental block. The images are also refined enough to suggest: (a) a boundary within the Pelican Thrust between its internal and external suites; (b) a possible boundary separating a lower (older?) Archaean basement from its upper (younger?) counterpart; and (c) sub-Moho events (M2) which reveal possible involvement of the upper mantle in the collisional tectonic process in addition to the well defined Moho (M1) which probably represents the youngest of the post-collisional detachments.  相似文献   

穿过张家口—渤海地震带西缘的折射剖面所揭示的地壳上地幔构造与速度结构   总被引：6，自引：0，他引：6  

聂文英  祝治平  张先康  张成科  盖玉杰  张建狮 《地震研究》1998,(1)

近期完成的北北东向的繁峙～太仆寺旗宽角反射／折射剖面,由山西断隆进入内蒙地轴,它穿过了山西地震带的大同～阳高震区和北西西向张家口～渤海地震带的西北缘。其主要目的是探测研究张～渤地震带及其两侧壳幔构造与速度结构的差异及其与地震活动的相关性。结果表明：张～渤地震带壳内界面及莫霍面较其两侧有１．０～２．０ｋｍ的不同程度的上隆;在阳原～张家口之间地壳结构纵向与横向非均匀性明显,上地壳和下地壳上部有局部的速度逆转,下地壳下部的低速层由山西断隆一直延伸至内蒙地轴,上地幔顶部的速度梯度明显增大;在阳原、怀安和张北附近分别存在着延伸至莫霍面的地壳深断裂带;在内蒙地轴一系列壳内界面不明显。  相似文献   

根据含超压气体裂隙震源模式讨论P波初动符号的分布   总被引：1，自引：1，他引：0  

王智培 《地震工程学报》1998,20(1):14-20

利用含超压气体裂隙震源模式［１］分析研究了Ｐ波初动符号的分布．根据理论推导,不同倾角含超压气体裂隙可分别形成Ｐ波初动符号的四象限分布图象和圆、椭圆、抛物线、双曲线等圆锥曲线形Ｐ波节线．按节线形状和失稳方式进行了地震分类．所推论的初动Ｐ波、Ｓ波振幅分布规律和地形变特征都与实际相符  相似文献   

水震波与地震面波的对比研究及其应用   总被引：16，自引：2，他引：14  

张子广  万迪坤 《地震》1998,18(4):399-404

利用同一地质单元内的水震波与地震面波资料进行对比研究,估算水位对含水层应力庆变的响应“格值”,选取唐山矿井水震波资料,唐山陆河地震台记录的地震面波资料,估算“格值”是９．１８２×１０＾－１０／ｃｍ,即唐山矿井观测含水层垂直应变量为９．１８２×１０＾－１０／ｃｍ时,井水位变化１ｃｍ。  相似文献   

Dynamics of upper tropospheric stationary wave anomalies induced by ENSO during the northern summer: A GCM study     

R. Krishnan  C. Venkatesan  R. N. Keshavamurty 《Journal of Earth System Science》1998,107(1):65-90

Ensemble seasonal integrations are carried out with the COLA GCM, with a view to understand the dynamical connection between warm SST anomalies in the equatorial central-eastern Pacific Ocean and the upper level stationary wave anomalies seen during drought years over the Indian summer monsoon region. In addition, experiments with and without orography are performed in order to examine the role of the Himalayas in modulating the El Niño induced stationary wave anomalies over the summer monsoon region. The GCM simulations show a statistically significant weakening of the summer monsoon activity over India in response to the SST forcing in the equatorial Pacific Ocean. This weakening of the summer monsoon appears to be largely related to modifications of the local Hadley and Walker cells over the summer monsoon region. In addition, it is seen that the anomalous ENSO divergent forcing over the tropical Pacific Ocean can act as a potential source for Rossby wave dispersion. Here one finds the possibility of meridionally propagating Rossby waves, which emanate from the ENSO forcing region, to interact with the subtropical westerlies and generate anomalous highs and lows in the subtropics and extratropics. The quasi-stationary perturbations seen over west Asia, Pakistan and northwest India during drought years, seem to be generated by the above mechanism. An alternate mechanism that could be important for the persistence of the quasi-stationary perturbations seems to be based on the dynamic excitation of middle latitude normal modes which can extract energy from the zonally varying unstable basic flow. It is seen from the GCM simulations, that the Himalayan orography plays a crucial role in anchoring the El Niño induced extratropical westerly troughs far to the west in the high latitude belt. In the absence of orography it is seen that the ENSO induced extra-tropical cyclonic anomalies tend to intrude southward into the monsoon region thereby destroying the regional scale circulations completely. Another effect due to the Himalayas is to generate lee waves on the eastern side of the topographic barrier which encircle the globe in the subtropics and midlatitudes.  相似文献   

浅层地震技术在隧道勘察中的应用   总被引：2，自引：0，他引：2  

张广忠  刘貅生 《煤田地质与勘探》1998,(Z1)

论述了在深圳市东部沿海高速公路隧道勘察中,应用浅层地震勘探方法查明地下地质构造、风化带、分层等,并根据资料解释成果、钻探资料和工区地质资料,对隧道开挖过程中可能遇到的断层及塌陷等情况进行了讨论。  相似文献