seismic refractive index method of mining
What is seismic refraction?, The most important thing to keep in mind when learning how the seismic refraction method works is this: When doing seismic refraction, we are only interested in first-arrival energy at each geophone The rest of the wave train -- reflected energy, surface waves, etc are discarded and ignoredGeological Methods In Mineral Exploration And Mining, These methods are: Gravity method Seismic method Electromagnetic method Geophysical Methods, Exploration Geophysics » Geology Science subsurface may not be prohibitive Reflection seismic methods provide fine structural detail and refraction methods provide precise estimates of depth to lithologies of differing acoustic impedance The ,Seismic refraction, The seismic refraction method involves measuring the shortest time required for an induced seismic pulse to travel from the source location to a series of receivers From this travel time data, seismic velocities and layer depths can be calculatedSeismic Reflection Surveys | SR |Geophysical Surveys, The Seismic Reflection method uses seismic energy (created by hammer impacts, accelerated weight drops, explosives, or vibroseis trucks) which gets reflected from geologic boundaries that have a velocity contrast Seismic Reflection is used extensively for large-scale exploration projects, especially within the petroleum and mining industryAD, This report is a summary of the theory and practice of using the refraction seismograph for shallow, subsurface investigations It is intended to be a guide to the application of the technique and not a comprehensive analysis of every aspect of the method The report begins with the fundamentals and then progresses from time-intercept ,.
Groundwater exploration methods, Aug 02, 2017· 37 Seismic Method Seismic methods are of two kinds as seismic refraction and reflection methods The seismic refraction method involves the creation of a small shock at the earth's surface either by the impact of a heavy instrument or by a small explosive charge and measuring the time required for the resulting sound, or shock, wave to travel ,GEOPHYSICAL METHODS IN EXPLORATION AND MINERAL ,, Reflection seismic methods provide fine structural detail and refraction methods provide precise estimates of depth to lithologies of differing acoustic impedance The refraction method has been used in mineral investigations to map low-velocity alluvial deposits such ,Seismic refraction, a technique for subsurface ,, Calculations of depth by the seismic refraction method must be highly qualified for a number of reasons, (Nettleton, 1940, p 255) Velocity does not necessarily increase with each successively deeper layer Also, the velocity and thickness relationship must be such that there is a seg ,APPENDIX 6 SEISMIC REFRACTION METHOD, The seismic refraction method has not been used in the mining industry as widely as other geophysical methods Consequently, we provide here only a description of the fundamental aspects of the method The reader requiring greater detail is referred to the descriptions given by Lankston (1990) A62 Acquisition and processing of seismic ,Seismic Refraction | Open Ground, Introduction The seismic refraction method utilizes seismic waves travelling through different parts of the subsurface A seismic source is used to generate compressional waves, which is measured by a seismograph and a series of evenly spaced sensors (typically 12, 24, 48 or more geophones).
Application of the Seismic Reflection Method in Mineral ,, makes the method capable of imaging deep targets and structures (eg Malehmir et al 2012a and references therein) This benefit led the mining industry to take advantage of the method and seek solutions to their prospecting problems with the seismic reflection method (Malehmir et ,Some Applications of Seismic Refraction Techniques in ,, The seismic method is divided into reflection and refraction techniques, based on whether or not a wave undergoes a reflection at the extent of its travel Thus, while most refracted events have not been reflected, most reflected events have been refracted, because a refraction occurs across any velocity interface in accordance with the simple ,Near, 35 meters Seismic refraction methods fail at this site because of an intra-alluvial velocity inversion Two seismic reflection surveys were conducted at the same location along a country road and were intended to outline the buried river channel The older survey was conducted in ,Seismic refraction, Seismic refraction is exploited in engineering geology, geotechnical engineering and exploration geophysics Seismic refraction traverses (seismic lines) are performed using an array of seismographs or geophones and an energy source The methods depend on the fact that seismic waves have differing velocities in different types of soil or rockDefinition of seismic method, There are two main subdivisions of seismic operations: the reflection method and the refraction method The seismic method has been applied to a lesser extent to elucidate mining problems, partly due to its high cost It has been used to investigate the base of drift deposits, and drift-filled channels have been successfully outlined Ref: Nelson.
seismic refraction investigation of the Archaean Kaapvaal ,, A seismic refraction investigation of the Archaean Kaapvaal Craton, South Africa, using mine tremors as the energy source , The control of geological and mining parameters on seismicity in the Klerksdorp gold mining district , Double-difference seismic attenuation tomography method and its application to The Geysers geothermal field ,(PDF) An Introduction to Petroleum Exploration Methods, Surface geophysical methods include magnetic, gravity, seismic refraction, seismic reflection, electrical resistivity, natural potential and,ground penetrating radarModule 1 : Site Exploration and Geotechnical Investigation ,, 2 Seismic refraction method General , Gravitational and magnetic methods are used in mining and petroleum engineering In geotechnical engineering, the gravitational method has very limited use for survey of unconsolidated sediments over the dense bedrockSeismic Refraction Methods, May 28, 2020· Seismic Refraction Methods May 28, 2020 admin Engineering, Geology engineering 0 Seismic surveys for engineering projects on land are mostly undertaken by the refraction technique Twelve or more geophones are used in a traverse while the seismic pulse is provided by explosives, falling weights or hammer blowsThe Seismic Refraction Method | Frontier Geosciences Inc, The seismic refraction method, due to its versatility, is one of the most commonly used geophysical methods in engineering, mining, groundwater exploration and environmental site investigations Based on favourable density contrasts that generally exist between geological materials, the refraction method is utilised to provide detailed ,.
ON A SEISMIC REFRACTION SURVEY ON, Seismic refraction work was carried out over Placer Lease #3497 located about 13 km N60°W (300°E) of the village of Manson Creek on Ah Lock Creek and Germansen River in the Omineca Mining Division, BC, during the period of November 1st to 28th, 1988 The ,Mineral Exploration | Methods | site, Methods Gravity , Seismic Refraction ; Snowmobile-mode DGPS , ClearView Geophysics Inc carries out ground-based geophysical surveys for Junior and Major Mining Compani Common targets include gold, base metals and diamonds Mining companies identify favourable geologic environments at the regional scaleCDC, High resolution seismic refraction tomography has proved to be a useful tool to effectively estimate depth of blast induced damage in a mine face Excavation blast damage can be as shallow as 1 to 2 m and requires resolution at a fraction of a meter for effective imagingSEISMIC REFRACTION SURVEY, other seismic refraction interpretation method as the Time-Interceps such or Crossovert - Distance methods GR allowM fosr som e variatio inn th e surface topograph as wely al s lateral variation in the seismic velocit oyf the upper layers Th methoe d use a principls e ofSeismic Refraction | Methods | site, The seismic refraction method is based on the measurement of the travel time of seismic waves refracted at the interfaces between subsurface layers of different velocity Seismic energy is provided by a source ('shot') located on the surface Energy radiates out from the shot point, either travelling directly through the upper layer (direct ,.
Techniques ofWater, Musgrave, AW, ed, Seismic-refraction prospecting: Tulsa, Okla, Society ofExploration Geophysicists, p 197-216 [Discussion of near-surface geologic conditions and the effects of varying shot depths on the interpretation of shallow refraction formulas] Meridav, Tsvi, 1960, Nomograms to speed up seismic refractionGEOPHYSICAL TECHNIQUES AND THEIR APPLICATIONS IN MINING, Seismic techniques are mostly being use in exploration for oil and gas but also have some applications in mining industries especially for locating metallic ore deposits in sedimentary basin Seismic techniques are also applicable for investigation of basement depth and crustal structure of underlain rocksHigh, The seismic methods are starting to be an essential tool in mining industry when the ore deposit is located under a thick altered layer The applicability of reflection and refraction seismic holds an importance in exploration surveys due to a great necessity to investigate higher depths, mainly if compressional and shear waves data are associated, then the separation of the two types of wave ,(PDF) Seismic refraction method: A technique for ,, The method of seismic refraction is one of the seismic techniques that is commonly used to evaluate soil and rock characteristics (Adegbola et al, 2013;Ayolabi et al, 2009)Mining Exploration: A New Frontier for the Canadian ,, Traditional geophysical exploration methods in the mining industry have relied heavily on potential-field and electromagnetic methods, both airborne and ground-based, to locate drilling targets Although it is generally recognized that seismic methods provide sufficient depth penetration and resolving power for deep exploration, the prevailing ,.