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Showing 1 to 20 of 34 for “"seismic refraction"”.
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Computer-aided interpretation of seismic refraction data
Includes bibliographical references.
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Seismic refraction on-site interpretation method, A
Includes bibliographical references.
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Seismic refraction measurements in the Western Mediterranean Sea
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1963.
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Crustal velocity structure in the southern coast belt, British Columbia, from a seismic refraction survey
… of the LITHOPROBE Southern Cordillera transect, seismic refraction data were recorded along a 350 km long strike profile in the Coast Belt. An iterative combination of two-dimensional travel time inversion and amplitude forward modelling was used to interpret crust and upper mantleP-wave velocity …
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Shallow subsurface deformation along the Pen Branch Fault in South Carolina: interpretation from seismic refraction stack sections
… An investigation with high resolution reflection seismic data is undertaken along the Pen Branch Fault. Five of the seismic lines are reprocessed to help in determining the upward depth of penetration of this fault. This is done by utilizing refracted arrivals from the multifold reflection data. …
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Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms
… multiple geophysical anomalies. An anomaly on a seismic refraction or an electrical resistivity tomogram is an area that has different values compared to its surrounding. Geophysical anomalies in dams and levees can be due to the overall heterogeneity of the subsurface, structures such as …
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Structure of the Queen Charlotte Basin and underlying crust from modelling and inversion of three-dimensional seismic refraction data
A combined seismic reflection and refraction survey was carried out in 1988 to investigate the structure and tectonic evolution of the Queen Charlotte (QC) Basin and underlying crust off the northern coast of British Columbia. While the marine multichannel reflection data were being collected, …
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Geophysical assessment of soil and rock in the New Madrid seismic zone
… At the Illinois site, borehole control, downhole seismic (DHS), seismic refraction tomography (SRT) and multichannel analysis of surface waves (MASW) data were acquired for the purpose of seismic site characterization. Shear wave and compressional wave velocities were used to estimate depth to …
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Seismic Tomography for the Integrity Assessment of Earthen Dams and Levees.
… examines the use of a non-invasive geophysical seismic method to provide additional information where the usual visual inspection is insufficient and the comboring investigation is not an option. Even though seismic techniques provide valuable information of the subsurface strata, the …
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Applications of Roll-Along Electrical Resistivity Surveying in Conjunction with Other Geophysical Methods for Engineering and Environmental Site Characterization
… electrical resistivity surveying was used with seismic refraction, magnetometer and gravity surveying in geophysical characterization of sites with a specific environmental or engineering problem. Three examples are presented where resistivity surveying provided vital constraints on acquisition …
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Electrical and seismic responses of shallow, volcanogenic, massive sulphide ore deposits
SP, resistivity/IP and seismic refraction responses of the Woodlawn Orebody and Mt.Bulga Deposit are examined and compared. Both exhibit similar responses produced mainly by uneconomic and disseminated sulphide mineralization and host rock features, demonstrating that the magnitude and character of …
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Crustal accretion and evolution at slow and ultra-slow spreading mid-ocean ridges
… Indian Ridge (SWIR) (full rate, 14 km/Myr). Seismic refraction data collected along the rift valley and flanking rift mountains of the OH-1 segment (35ʻN) at the MAR show that the entire crustal section is constructed within a zone that is less than 5 km wide. Shallow-level hydrothermal …
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Crustal seismic velocity structure of the intermontane and coastal belts, southwestern Canadian Cordillera
One phase of LITHOPROBE's seismic program for the Southern Cordillera included a seismic refraction experiment (SCoRE '89) focussing on the Coast and Intermontane Belts of the Southern Canadian Cordillera. Primary objectives of the refraction program include; i) determining 2-D velocity structure …
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Seismic constraints on shallow crustal processes at the East Pacific Rise
… is upon fast-spreading ridges, and the use of seismic techniques to image the uppermost several hundred meters of the crust. We present the results of nine on-bottom seismic refraction experiments carried out over young East Pacific Rise (EPR) crust. The experiments are unusual in that both the …
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Heat flow and heat production studies in North Dakota
… depth of the Moho (45 to 55 km) as determined by seismic refraction data. </p>
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A geophysical characterization of New River terrace deposits in Giles County, Virginia
… in lithology within the alluvial sediments. Seismic velocities (P-wave) obtained from reversed seismic refraction profiles range from 900-1700 meters/second, while apparent electrical resistivity values vary from 300-2000 ohm-meters. A 75 meter wide, east-west trending low resistivity zone …
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Crustal structure and evolution beneath the Colorado Plateau and the southern basin and range province
… recorded at 72 USArray and other broadband seismic stations placed on the Colorado Plateau and the SBRP in Arizona revealed systematic spatial variations in crustal Vp/Vs, crustal thickness and amplitude of P-to-S converted phases. Our results reveal that the BRP is characterized by a thin …
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Seismic studies on the Derbyshire dome
… project is principally concerned with four 30km seismic refraction lines which crossed the limestone outcrop of Derbyshire and N. Staffordshire in order to investigate the Dome's upper crustal structure, using quarry blasts as seismic sources. A time-term analysis of refracted arrival data …
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Apparent weekly and daily earthquake periodicities in the western United States, and evolution of Wadi Kubbania in Egypt
… western United State [sic]. Analysis of Apparent Seismicity Rate (ASR) in the western United States confirmed the existence of prominent spectral peaks with a period of 1 and 7 days. The number of recorded earthquakes on Sundays for the duration of 1963-2008 is about 5% higher than that on …
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Finite Element Modeling of Seismic Wave Propagation in Earthen Embankments
… in embankments (dams and levees) by geophysical seismic techniques such as seismic refraction is limited by a number of factors. Some factors are associated with inversion and smoothing problems during processing, while others are associated with the natural characteristics of embankments and …
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