Spelling suggestions: "subject:"eismic refraction"" "subject:"zeismic refraction""
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Marine seismic studies near Newport, OregonErickson, Barrett H. 08 August 1966 (has links)
In July 1964 three seismic refraction profiles were recorded
over Stonewall Bank (44°32'N, 124°24'W) to determine gross sub-bottom
geological structure to depths of thousands of feet. In August
1964 a continuous seismic reflection profiler was used to document
shallow geological structure within the rocks forming the Bank.
Stonewall Bank is composed of eastward dipping Pliocene siltstones
which emerge westward from beneath unconsolidated Quaternary
sediments. These siltstones form gentle dip slopes on the
Bank's ea-stern flank but rougher topography is found on the top and
western flank where the bedding planes intersect the sea floor at
greater angles. Refraction data from this study indicate the siltstones
thicken southward by 5000 feet over a six mile distance which
accounts for almost all of the thickness change in the measured section.
A deeper layer, 5000 feet thick, which appears to be Miocene
may be exposed west of the Bank beneath the sediments. The base
of this deeper layer has a southerly dip component of about six degrees
and lies 12, 000 feet below the southern end of the Bank.
Although this was the deepest interface encountered, the underlying
material is not believed to be basement. / Graduation date: 1967
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Model parameterization in refraction seismologyValle G., Raul del. January 1986 (has links)
No description available.
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Three-dimensional (3D) three-component (3C) shallow seismic refraction surveys across a shear zone associated with dryland salinity at the Spicers Creek Catchment, New South Wales, Australia /Nikrouz, Ramin. January 2005 (has links)
Thesis (Ph. D.)--University of New South Wales, 2005. / Also available online.
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Seismic refraction study at Dome C, AntarcticaGassett, Roger. January 1982 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 58-61).
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Seismic refraction studies on the Ross Ice Shelf, AntarcticaKirchner, Joseph Francis. January 1978 (has links)
Thesis (M.S.)--Wisconsin. / Includes bibliographical references (leaves 62-67).
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Geophysical applications to archaeological investigations /Hinz, Emily Anne, January 2007 (has links)
Thesis (M.S.)--University of Texas at Dallas, 2007. / Includes vita. Includes bibliographical references.
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Model parameterization in refraction seismologyValle G., Raul del. January 1986 (has links)
No description available.
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Crustal structures and tectonism in southeastern Alaska and western British Columbia from seismic refraction, seismic reflection, gravity, magnetic, and microearthquake measurementsJohnson, Stephen Hans 13 October 1971 (has links)
Seismic refraction measurements along two unreversed lines
indicate that the earth's crust is 26 km thick in southeastern Alaska
and 30 km thick along the Inside Passage of British Columbia. The
crust in southeastern Alaska, north of Dixon Entrance, consists of
a layer 9 km thick with a seismic velocity of 5.90 km/sec, a layer
7 km thick with a seismic velocity of 6.30 km/sec. and a layer 10 km
thick with a seismic velocity of 6.96 km/sec. The crust along the
Inside Passage of British Columbia, south of Dixon Entrance, consists
of a layer 13 km thick with a seismic velocity of 6.03 km/sec, a layer
5 km thick with a seismic velocity of 6.41 km/sec, and a layer 12 km
thick with a seismic velocity of 6.70 km/sec. The velocity of the
mantle below the M discontinuity is 7.86 km/sec in southeastern
Alaska and 8.11 km/sec in British Columbia.
A compilation of Bouguer gravity data along the Inside Passage
from northern Vancouver Island to northern southeastern Alaska
indicates near-zero anomalies between steep gradients offshore and
near the western margin of the Coast Mountains. A two-dimensional
gravity model, constrained by seismic refraction measurements,
suggests that the thickness of the crust is constant beneath the region
of near-zero gravity anomalies and indicates a step-like transition
between oceanic and continental structure.
Seismic reflection, gravity, and magnetic measurements,
obtained during a 1970 cruise of the R/V Yaquina, help to determine
upper crustal structures in Dixon Entrance. Gravity models, constructed to agree with these data and the measurements of previous
investigators, indicate sediment thicknesses of nearly 3 km east
of Learmonth Bank and west of Celestial Reef. Magnetic models
suggest large lateral changes in basement susceptibility. Either
highly metamorphosed rock or basaltic intrusions can account for
these changes in susceptibility. Folded sediments suggest post depositional
distortion due either to regional compression or to
major local intrusions. Several linear gravity features, observed
in northern Dixon Entrance, disappear north of Graham Island.
Either the structures responsible for the gravity features end or
thick layers of basalt, extending northward from Graham Island,
obscure the effect of the structures.
A single-station survey detected microearthquakes at nine
locations in western British Columbia and southeastern Alaska. The
majority of the observed distant microearthquakes probably originated
in the Queen Charlotte Islands fault zone. However, observed
nearby microearthquakes indicate a microearthquake seismicity of
several events per day along the mainland coast of British Columbia.
Temporary seismic arrays located at a site along the central
portion of Chatham Strait near the Chatham Strait fault and at a site
in Glacier Bay recorded few nearby microearthquakes. Arrivals at
the arrays permitted the location of distant microearthquakes, however,
with epicenters in the vicinity of northern Lynn Canal and along
the Fairweather fault. / Graduation date: 1972
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Removing near-surface effects in seismic data : application for determination of faults in the Coastal Plain sediments /Sen, Ashok Kumar, January 1991 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 96-97). Also available via the Internet.
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Recording the Kapuskasing pilot reflection survey with refraction instruments : a feasibility studySamson, Claire. January 1985 (has links)
No description available.
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