3 edition of Continuous monitoring and interpretation of crustal velocity changes near Palmdale, California found in the catalog.
Continuous monitoring and interpretation of crustal velocity changes near Palmdale, California
Robert A. Phinney
|Statement||Robert A. Phinney and Peter C. Leary ; supported by the Earthquake Hazards Reduction Program.|
|Series||Open-file report / U.S. Geological Survey -- no. 81-289, Open-file report (Geological Survey (U.S.)) -- 81-289.|
|Contributions||Leary, P. C., National Earthquake Hazards Reduction Program (U.S.), Geological Survey (U.S.)|
|The Physical Object|
1. Introduction  At plate boundaries plates move and slowly deform resulting in a gradual buildup of stress, which is suddenly released in an earthquake. These changes in stress can cause changes in seismic velocity, both prior to and as a result of large earthquakes. Since the probability of an earthquake increases with increasing stress, monitoring the changes in seismic velocity near Cited by: change and steeper source geometry. If we regard post events as proxy for future eruption hazard, the inferred source dynamics (e.g., mid-crustal location and low volume change) from these post events suggest that the probability for near-term eruption is low. Our study demonstrates that CG PS, along with InSAR, are.
Fission track, radiometric, and paleomagnetic age determinations in marine sedimentary rocks of the Ventura Basin make it possible to estimate the vertical components of displacement rates for the last 2 million years. The basin subsided at rates up to ± millimeters per year until about million years ago, when subsidence virtually ceased. Since then, the northern margin of the Cited by: Department of Earth and Space Sciences, University of California, Los Angeles, CA PROFESSIONAL EMPLOYMENT Professor of Geophysics, UCLA - present EDUCATION Ph.D, Department of Earth and Planetary Science, MIT B.S., Department of Physics, California Institute of Technology AWARDS AND HONORS.
High-precision gravity stations for monitoring vertical crustal motion in southern California by Carter W. Roberts1 and Robert C. Jachens1 Open-File Report This report has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic by: 2. Crustal thickness increases laterally by 12 km over a distance of less than 50 km into the San Gabriel Mountains. This conclusion is supported by widespread surface evidence for rift-style volcanism and crustal extension in southern California crustal rocks. Citation Kohler, M. D., & Davis, P. M. ().
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Phinney and Peter C. Leary Department of Geological and Geophysical Sciences Princeton University Princeton, New Jersey USGS CONTRACT NO. Supported by the EARTHQUAKE HAZARDS REDUCTION PROGRAM OPEN-FILE NOAuthor: Robert A.
Phinney, P.C. Leary. Continuous monitoring and interpretation of crustal velocity changes near Palmdale, California Open-File Report By: Robert A. Phinney and P.C.
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The Earthquake Engineering Online Archive NISEE e-Library. Identifier: Text-S Title: Continuous monitoring and interpretation of crustal velocity changes near Palmdale, California.
Journal Article: Changes in crustal resistivity near Palmdale, California. Partnered Journals. Chinese Journal of Geophysics () Earth Interactions; Earth and Planetary Physics; Geophysics; International Journal of Geomagnetism and Aeronomy.
Continuous subsurface velocity measurement with coda wave interferometry also better tools to image subtle changes of crustal rocks as (), Systematic monitoring of millisecond travel time variations near Palmdale, California, J. Geophys. Res., 84, – 4.
Temporal Changes in Velocity and Possible Interpretation  We used two methods to calculate the temporal velocity variation. The first one used the first shot fired at pm of 7 April as the reference and all the resulting temporal variation is the accumulative changes occurred after the first by: continuous network measurements focus on actively erupting basaltic volcanoes (e.g.
Owen et al., ), where eruptive cycles are short. Recently, continuous GPS systems have also been deployed at a small number of explosive, andesitic volcanoes.
In this paper, we present initial results from one of the ﬁrst such continuous monitoring. In two separate shallow field experiments, at two distancescales, we have used continuous monitoring to estimate the effect ofbarometric pressure on crosswell travel time and thereby calibrated thestress sensitivity of the rock volume between the wells.
In a 3 mexperiment we found a stress sensitivity of /Pa while in a 30 mexperiment the. Here we report geodetic evidence for a coherent, subcontinental-scale change in tectonic velocity along a diffuse ∼ 1,km-wide deformation zone.
Our observations are derived from continuous Cited by: Preseismic velocit changes observed for active source monitoring at the Parkfield SAFOD drill site Article (PDF Available) in Nature () August with Reads How we measure.
Seismic noise interferometry is an exciting technique for studying volcanoes, providing a continuous measurement of seismic velocity changes (dv / v), which are sensitive to magmatic processes that affect the surrounding crust. However, understanding the exact mechanisms causing changes in dv / v is often difficult.
We present dv / v measurements over 10 years in central Iceland, Author: Clare Donaldson, T. Winder, Corentin Caudron, R.S. White. The inferred high stress sensitivity of velocity change (0. 2 bar**-**1) may be attributed to the presence of extremely thin cracks (aspect ratio 10**-**5) by which the rock mass near the surface.
Passive image interferometry for monitoring crustal changes with ambient seismic noise Application de l’imagerie passive à la surveillance des the continuous monitoring of changes in the subsurface medium.
VonCollnSystematic monitoring of millisecond travel time variations near Palmdale, California. Geophys. Res., 84 (B2) ( Cited by: crustal density will be eliminated by these techniques. Even though base levels may change, short-wavelength residual anomalies (crustal sources tend to be little changed by the use of different isostatic models in California [dachens and Griscom, ] which vary only by 10 percent and are long wavelength in character.
Crustal Thickness Variations in Southern California from Los Angeles Region Seismic Experiment south, characterizing the northern San Gabriel Valley (Yer- kes et al., ). The Los Angeles basin and Transverse Ranges are composed of markedly different geological blocks. Recomputation of vertical crustal motions near Palmdale, California.
In: P. Vyskocil, A.M. Wassef and R. Green (Editors), Recent Crustal Movements, Tectonophysics, 2 1 - 3 8. between and ; the pattern and magnitude of 2 the apparent movement were first discussed by Castle et al.
().Cited by:. About twenty blasts are used to determine crustal structure and to monitor temporal seismic velocity changes in southern California. The shot time is determined up to 10 msec by using a disposable pick-up placed directly on the explosive.
About 17 permanent stations Cited by: Subcontinental-Scale Crustal Velocity Changes Along the Pacific-North America Transform Plate Boundary From BARGEN GPS Data Full citation: Davis, J. L., Wernicke, B.L., Bisnath S., Niemi, N. A., and Elósegui, P. () Subcontinental-Scale Crustal Velocity Changes Along the Pacific-North America Transform Plate Boundary From BARGEN GPS Data.Crustal Deformation Monitoring Geodetic methods are used to measure movement of the Earth’s surface and strain in the upper few hundred meters of the Earth’s crust.
Geodetic measurements have applications for seismic hazard assessment, earthquake early warning, earthquake likelihood monitoring, and research into underlying physical processes.