Gravity observations along a passcal seismic line in west-central Nevada

Cover of: Gravity observations along a passcal seismic line in west-central Nevada |

Published by U.S. Dept. of the Interior, U.S. Geological Survey, Open-File Services Section, Branch of Distribution in Denver, Colo .

Written in English

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Subjects:

  • Gravity -- Nevada

Edition Notes

Includes bibliographical references (leaf 4)

Book details

Statementby J.M. Glen, J.S. Lewis, and D.A. Ponce
SeriesOpen-file report -- 87-403, U.S. Geological Survey open-file report -- 87-403
ContributionsLewis, J. S, Ponce, David A, Geological Survey (U.S.)
The Physical Object
FormatMicroform
Pagination1 microfiche
ID Numbers
Open LibraryOL13612332M

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GRAVITY OBSERVATIONS ALONG A PASSCAL SEISMIC LINE IN WEST-CENTRAL NEVADA By J. Glen1, J. 2, and D. Ponce1 Open-Pile Report This report is preliminary and has not been reviewed for conformity with US.

Geological Survey editorial standards and strati- Cited by: 3. Gravity observations along a passcal seismic line in west-central Nevada (Open-file report / Department of the Interior, U.S. Geological Survey) [Glen, J.

M] on *FREE* shipping on qualifying offers. Gravity observations along a passcal seismic line in west-central Nevada (Open-file report / Department of the Interior. Get this from a library. Gravity observations along a passcal seismic line in west-central Nevada. [J M Glen; J S Lewis; David A Ponce; Geological Survey (U.S.)].

Summary not available for this title. Record Details Catalog Search. Gravity observations along a passcal seismic line in west-central Nevada [microform] / by J.M. Glen, J.S. Lewis, and D.A. Ponce U.S.

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M Glen. GRAVITY SURVEY OF DIXIE VALLEY, WEST-CENTRAL NEVADA By Donald H. Schaefer ABSTRACT Dixie Valley, a northeast-trending structural trough typical of valleys in the Basin and Range Province, is filled with a maximum of ab feet of alluvial and lacustrine deposits, as estimated from residual-gravity measurements obtained in this study.

Gravity and Magnetic Data Along a Seismic Refraction-Reflection Line in Northwest Nevada and Northeast California By Janet E. Tilden, David A. Ponce, Jonathan M.G. Glen, and Kathleen D. Gans1 Introduction In September,the U.S.

Geological Survey (USGS) collected 84 gravity stations and about line-kilometers ( line-miles) of truck-towed magnetometer data in northwest Nevada. Gravity observations along a passcal seismic line in west-central Nevada [microform] / by J.M.

Glen, J.S Principal facts of gravity stations with gravity and magnetic profiles from the southwest Nevada Test Si. of northwestern Nevada based on seismic refraction/wide-angle reflection, near-vertical reflection, and gravity data.

In comparison to most previous estimates, we find that the crust is somewhat. The average observation density of the dataset is about 1–6 sites/km 2.

Data acquisition has been made primarily using the Scintrex CG-3 and CG-5 Worden gravity meters. The Kittilä area observations started in and the latest measurements used in this work were taken in the summer of The total number of gravity observations used is. The authors compare seismic refraction and reflection results along the PASSCAL/COCORP 40{degree}N transect in the northern Basin and Range of Nevada in order to determine the origin of the.

2D seismic data are acquired along a 1D line on the surface. 3D seismic data are acquired over a 2D area of the surface. How is 4D seismic data acquired. as identical 3D surveys repeated at different times (i.e. with time lapses) 8.

The acoustic impedance of a rock layer is a parameter that may be calculated from some. Gravity and magnetic data along a seismic refraction-reflection line in northwest Nevada and northeast California. Half a dozen seismic faults along the Nevada-California border — including two within 60 miles of Reno and one about miles from Las Vegas — appear primed to unleash a moderate to major.

The Southwest Region includes California, Nevada, and Arizona. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

The transverse and vertical components of the ground accelerations recorded during the Koyna earthquake are shown in Figure –3 (units of g = m sec –2). Prior to the earthquake excitation, the dam is subjected to gravity loading due to its self-weight and to the hydrostatic pressure of the reservoir on the upstream wall.

Gravity for Hydrocarbon Exploration Gravity. It’s not just a good idea. It’s the Law. Gerry Mooney () Portrait of Sir Isaac Newton, c. – Thanks to Newton’s Law of universal gravitation, you are safely standing on earth and not flying off into space. The gravitational attraction between two masses increases as their mass expands and decreases as the distance between them grows.

Gravity studies conducted in Yucca Flat between and have defined the configuration of the pre-Cenozoic surface underlying Yucca Flat, the t Book Chapter Gravity and Seismic Study of Yucca Flat, Nevada Test Site. Geophysical studies by Langenheim, et. () have characterized preliminary basin geometries and thickness of basin fill based on gravity, drillhole and seismic reflection data.

Results have indicated that the deepest areas of the basin are located in the northeast section of the valley with a maximum basin thickness of 5 km (Figure 1).

Composition of the lower crust in west central Arizona from three-component seismic data, A seismic refraction line along the axis of the southern Piedmont and crustal thickness in the southeast United States, Nevada, along the COCORP 40°N seismic-reflection transect.

Gravity Magnetics Seismic Acquisition Send sound waves, collect the echoes. •One shot causes reflections all along the reflector Most Seismic Surveys use P-Waves Migrated (corrected) line after processing. Fault Diffractions: Seismic energy is scattered at sharp edges Diffractions.

Seismic Waves is a browser-based tool to visualize the propagation of seismic waves from historic earthquakes through Earth’s interior and around its surface. Easy-to-use controls speed-up, slow-down, or reverse the wave propagation. Detailed gravity modeling [McCarthy et al., ; Mickus and James, ] along a seismic refraction profiles in western Arizona indicates that the lower crust is significantly denser and thicker in narrow regions associated with highly extended crustal regions.

Song and Simons examined existing data from satellite-derived observations of the gravity field in subduction zones. Comparing variations in gravity along the trenches with earthquake data from two different catalogs going back years, the team found that, within a given subduction zone, areas with negative gravity anomalies correlated with.

seismic data 7 history of seismic structure of icelandic crust 7 different contributions to the crustal structure model of krafla 9 p-wave-velocity-density systematics 11 density of icelandic rocks 14 5.

gravity data 15 bouguer gravity map 16 gravity profile 17 interpretation of gravity anomalies and. Standard gravity is therefore Gal or mGal. It is useful to remember that 1 mGal is just a bit more than 1 millionth of g n ( x g n).

Observed Gravity (g obs) - Gravity readings observed at each gravity station after corrections have been applied for instrument drift and earth tides. Gravity and magnetic data along a seismic refraction-reflection line in northwest Nevada and northeast California.

east-central Nevada. Gravity observations from 99 locations in this area, with free-air, isostatic, and complete Bouguer anomalies. West-Central Nevada and east-central California.

Combined seismic and gravity measurements have been used to map an old buried tectonic valley close to the river Klarälven in western Sweden.

A gravity low of around 4 mGal is observed along the valley. Interpretation of the gravity data and seismic refraction/wide-angle reflection data indicates that the depth to bedrock exceeds m in the valley.

The Deep Probe active seismic line found that the crustal thicknesses in eastern parts of the Colorado Plateau to be near 40–45 km thick [Snelson et al., ]. [34] Where the southern cross section transects the Colorado Plateau, we observe an arrival at 35–40 km depth with smaller amplitudes than those below the Rocky Mountains (Figure 6.

of travel-time and group velocity observations using the Simul velocity inversion code. Cal-culated gravity measurements compared to gravity observations helped improve areas that lacked seismic data.

SSJD extends from the Great Valley’s western margin to the Sierra. Principal facts, gravity profile, and interpreted geologic model for gravity stations along a portion of a COCORP seismic profile on the Millett 1 quadrangle, Nevada (SuDoc I ) [U.S.

Geological Survey] on *FREE* shipping on qualifying offers. (P) Mooney, W.D., and Colburn, R.H.,A seismic refraction profile across the San Andreas, Sargent and Calaveras faults, West Central California Bulletin of Seismology Society of Amer pp.

See PDF. GLOBAL GRAVITY, POTENTIALS, FIGURE OF THE EARTH, GEOID35 Intermezzo The gradient of the gravitational poten-tial We may easily see this in a more general way by expressing dr (the incremental distance along the line joining two point masses) into some set of coordinates.

Gravity measurements were made along 5 profiles across parts of the Coyote Spring Valley and vicinity in order to aid in modeling the depth and shapes of the underlying basins and to locate faults concealed beneath the basin fill. Measurements were taken at m ( ft) spacing along the profiles.

Models based on these and existing regional data reveal two north-south-trending basins beneath. The Sierra Nevada EarthScope Project (SNEP) (Owens et al., ) consisted of an array of three-component broadband seismometers with a north-south extent of > km north from about Fresno, California, and a west-east extent of > km from the Great Valley to the Basin and Range ().The primary purpose of the SNEP was to image the deep structure of the Sierra Nevada batholith in order.

The main goal of this study is to compare different reflection methods used to image subsurface structure within different physical environments in western Nevada.

With all the methods employed, the primary goal is fault imaging for structural information toward geothermal exploration and seismic hazard estimation.

We use seismic CHIRP a swept-frequency marine acquisition system, weight drop. This experiment was designed to measure the velocities of the shear waves to a depth of about meters along two lines.

One line ran down the middle of east and south Los Angeles, California, along the San Gabriel River and its bike path, all of the way from the mountains down to where the river met the sea at Seal Beach. the gravity field vector. In contrast, a gravity gradiometer can measure up to five of the nine terms in the gravity field’s gradient tensor which completely describes the anomalous gravity field gradient.

Note how the two gradiometer measurements better emphasize the structural highs and lows as well as the bounding fault zones.

We also analyse infrasound from well-constrained explosions in northern Utah with a denser IRIS PASSCAL seismic network. hotspot in west central Europe. seismic stations deployed along the.The gravity wave drag parameterization used at NMC is a fairly crude approximation of gravity waves forced numerous observations (see Table 1 in PH).

In Fig.the universal flux function, G, is shown as a function of Froude number and mountain shape parameters. A .What is Seismic Reflection? Seismic refraction is a geophysical principle governed by Snell's Law.

Used in the fields of engineering geology, geotechnical engineering and exploration geophysics, seismic refraction traverses (seismic lines) are performed using a seismograph(s) and/or geophone(s), in an array and an energy source.

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