2 edition of Investigation of sub-surfact structure in North York Township by seismic refraction method. found in the catalog.
Investigation of sub-surfact structure in North York Township by seismic refraction method.
Dennis Richard Matt
Written in English
Thesis (M.A.) -- University of Toronto, 1949.
|The Physical Object|
These methods allow the economical collection of subsurface data and provide the basis for more efficient collection of subsurface data by test drilling or aquifer tests and results in improved hydrologic studies. This manual briefly reviews the basics of seismic refraction theory and : F. P. Haeni. significant part for civil infrastructures. The seismic refraction technique is considered an accurate geophysical method to investigate the shallow geological structures of an area. During the past decades, the seismic parameters obtained by a refraction survey have been widely used in cases of site investigation as indicators of rock mass.
The body forces in Eq. can be imposed in the surrounding soil of the underground structure to analyze its peak seismic responses, as shown in Fig. 7. In the monolithic soil-structure system, the side boundaries arThus the nonlinear pseudo-static (pushover) analysis is implemented to obtain the relationship between internal forces (moment, shear force and axial force) and deformation (rotation Cited by: Shallow seismic reflection can be useful in characterizing shallow structures or anomalies within the upper 50 meters of the subsurface, mainly when the seismic refraction method does not work, that is, where the P-wave velocity contrasts between beds are not significant to produce first arrival refracted waves or where occurs velocity.
ing sites; these are refraction seismic testing and electrical resistivity. We have used both in highway exploration work in Massachusetts and have found the seismic method to be, by far, the most satisfactory. The seismic method, like other geophysical methods, is indirect insofar as identifying materials is : Louis W. Currier. Seismic refraction is mostly used in geotechnical work to determine the velocity of the overburden and the refractor velocity. Roll along, in seismic refraction tomography, is important for three reasons. These are to increase the profile length beyond the distance dictated by the source and the instrument (number of receiver and cable length), to increase the signal to noise ratio and to Author: CC Chiemeke, IB Osazuwa.
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Investigation of Subsurface Structures by Using Seismic Refraction Method, Northwestern of Al-Anbar Governorate / Iraq Salman Z. Khorshid* and Mundher -Awsi** Vol: 10 No: 4, October 4 ISSN: The seismic refraction method is based on the measurement of the travel time of seismic.
Salman ZK, Al-Awsi MDh () Investigation of Subsurface Structures by Using Seismic Refraction Method, Northwestern of Al-Anbar Governorate / Iraq SEISMIC REFRACTION, A TECHNIQUE FOR SUBSURFACE INVESTIGATION IN IOWA by William Praed Staub A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Subjects: Geology Soils Engineering Approved: In CKarge of Major-Work Head of Major Department Iowa State UniversityCited by: 2.
A geophysic survey is performed to detect subsurface structure under STMKG Campus in Pondok Betung, South Tangerang, Indonesia, using seismic refraction method. The survey used PASI 16SU The waveform data is acquired from 3 different tracks on the research location with a close range from each track.
On each track we expanded 24 geofons with spacing between receiver 2 Author: Bagus Adi Wibowo, Drajat Ngadmanto, Daryono. The study area is located in Ayer Hangat, north of Langkawi Island, and it is bounded by longitudes 99 o 48’ ” E and 99 o 48’ ” E, and latitudes 6 o 25’ ” N and 6 o Measurement of subsurface conditions by the seismic refraction method requires a seismic energy source, trigger cable (or radio link), geophones, geophone cable, and a seismograph (see Fig.
The arrival of energy from the seismic source at each geophone is. 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 File Size: KB. works. These are the refraction-seismic and the earth-resistivity methods of test. The use of magnetic methods has been reported by several investigators in con nection with the location of basalt plugs and other geologic formations possessing measurable magnetic properties.
Although the magnetic method may be used to ad. THE USE OF SEISMIC REFRACTION METHOD IN SLOPE FAILURE INVESTIGATION landslide or slope failure, the soil properties of the disturbed failure material are in general lower in terms of shear strength, rigidity, bulk density and porosity as compared to the original ground.
As such, both the compressional and shear wave. Seismic Refraction. 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. Seismic refraction investigates the subsurface by generating arrival time and offset distance information to determine the path and velocity of the elastic disturbance in the ground.
The disturbance is created by shot, hammer, weight drop, or some other comparable method for. The integration of geo-electrical and shallow seismic refraction data are used to define the properties and characteristics of the different subsurface layers and to delineate the structural elements which could have direct effects on the constructions in the Quar which is a part of the May 15th by: 4.
The paper deals with seismic refraction survey as a method forin situ pre-investigation for the Rwegura hydro-electric power plant at Burundi.
After a short description and discussion of theoretical relations the performance of the measurements is reported. The presentation of the results includes travel-time curves, comparison with sounding results and discussion of wave : W.
Haupt. A 2-D upper crustal structural profile with seven steeply dipping faults was constructed from the Los Angeles Region Seismic Experiment phase II (LARSE II) seismic refraction data recorded over the north central Transverse ranges and adjacent Mojave desert in southern California.
The profile extends to a depth of approximately 4 by: demonstrated that this method is also applicable in the detection of non-circular cavities. Investigation of underground cavities in a two-layer model using the refraction seismic method Tihomir Engelsfeld1*, Franjo Šumanovac2 and Nenad Pavin3† 1 Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb, Croatia.
Seismic Reflection follows the law of mirror images the angle of reflection from a surface is equal to the angle of incidence. Shots are fired, in turn, at each of the geophone positions and active geophones are progressively added ahead of the shots, and taken up from behind the shots, in a roll–along fashion.
Armour, A. () A seismic refraction study of the crustal structure of North West Scotland and adjacent continental margin. Doctoral thesis, Durham University. Armstrong, G. () Coupling between torsional and bending modes of vibration in cantilever beams. Doctoral thesis, Durham University.
The seismic refraction method involves the analysis of the travel times of arrivals that travelled roughly parallel to the upper surface of a layer during their journey through the subsurface.
These are direct arrivals (see Section ) and critically refracted arrivals (see Section ) as is implied by the method’s name; although it. This book is an essential tool for understanding the problem of structural irregularities and provides the most up-to-date review on this topic, covering the aspects of ground rotations, analysis, design, control and monitoring of irregular : Hardcover.
As part of the geotechnical study, GeoView, Spotlight Geophysics and ATI Panamericana were tasked to provide seismic P-wave and S-wave velocity structure of the subsurface. The consortium collected seismic refraction and multi-channel analysis of surface waves (MASW) data along survey transects approximately 4 kilometers in length.
Seismic survey is the geophysical method, which is most closely related to rock and soil mass properties, since seismic wave velocity varies with the main mechanical properties, such as Poisson’s ratios and others modules. The earliest applications of the method primar-ily concerned the determination of the depth to bedrock beneath a soil Size: KB.Other articles where Seismic refraction method is discussed: Earth exploration: Seismic refraction methods: Seismic methods are based on measurements of the time interval between initiation of a seismic (elastic) wave and its arrival at detectors.
The seismic wave may be generated by an explosion, a dropped weight, a mechanical vibrator, a bubble of high-pressure air.The first investigations of the subsurface structure of the continental shelf off the New York - New Jersey metropolitan area were seismic-refraction studies by Ewing and .