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Browsing Geological Sciences and Engineering - Faculty Research by Type "Citation"
Now showing items 1-20 of 45
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2D Analysis of Earthquake Ground Motion in Haifa Bay, Israel
(4/1/2010)We study the earthquake response of the Zevulun Valley basin, underlying northern Israel’s largest urban area, with 2D viscoelastic seismic modeling of a detailed geological section. We found that amplification of the ... -
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A combined first-arrival travel time and reflection coherency optimization approach to velocity estimation
(3/1/1997)We present a nonlinear optimization method for two-dimensional velocity estimation in strongly heterogeneous media. We achieve this by designing a simulated-annealing algorithm to simultaneously maximize reflection coherency ... -
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A generalized simulated-annealing optimization for inversion of first-arrival times
(10/1/1994)We employ a Monte Carlo-based optimization scheme called generalized simulated annealing to invert first-arrival times for velocities. We use “dense” common depth point (CDP) data with high multiplicity, as opposed to ... -
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A seismic reflection image for the base of a tectonic plate
(2/5/2015)Plate tectonics successfully describes the surface of Earth as a mosaic of moving lithospheric plates. But it is not clear what happens at the base of the plates, the lithosphere–asthenosphere boundary (LAB). The LAB has ... -
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A Shallow Shear-Wave Velocity Transect across the Reno, Nevada, Area Basin
(12/1/2004)In October and November 2001, we performed an urban shear-wave velocity transect across 16 km of the Reno, Nevada, area basin. Using the refraction microtremor method of Louie (2001) we determined shear-wave velocity versus ... -
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A Transect of 200 Shallow Shear-Velocity Profiles across the Los Angeles Basin
(6/1/2006)This study assesses a 60 km north-northeast–south-southwest transect along the San Gabriel River for shallow shear velocities, in San Gabriel Valley and the Los Angeles Basin of southern California. We assessed a total of ... -
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Application of simulated annealing inversion on high-frequency fundamental-mode Rayleigh wave dispersion curves
(7/26/2007)The simulated annealing (SA) inversion technique has been successfully applied for solving various nonlinear geophysical problems. Following previous developments, we modified the SA inversion, yielding 1D shallow S-wave ... -
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Array analysis of reflector heterogeneity
(4/1/1991)In deep crustal reflection study, as in conventional exploration seismology, it is important to determine the geometry of the physical contrasts between rocks that cause reflections, to make reliable geologic interpretations. ... -
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Blind Shear-Wave Velocity Comparison of remi and masw Results with Boreholes to 200 m in Santa Clara Valley: Implications for Earthquake Ground-Motion Assessment
(12/1/2005)Multichannel analysis of surface waves (masw) and refraction microtremor (remi) are two of the most recently developed surface acquisition techniques for determining shallow shear-wave velocity. We conducted a blind ... -
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Characterization of Near-Surface Geology at Strong-Motion Stations in the Vicinity of Reno, Nevada
(12/1/2007)We evaluate site conditions at each of the 21 Advanced National Seismic System (ANSS) strong-motion stations in the Reno–Sparks, Nevada, area. Shallow shear-wave velocities are measured using the refraction microtremor ... -
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Computing Green's Functions from Ambient Noise Recorded by Accelerometers and Analog, Broadband, and Narrow-Band Seismometers
(9/1/2011)The objective of our study is to supplement the regional P / S 3-D velocity model in the Reno basin with shear-wave velocity models derived from ambient noise interferometry (Aki 1957; Claerbout 1968; Shapiro et al. 2005; ... -
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Correlation Length and Fractal Dimension Interpretation from Seismic Data Using Variograms and Power Spectra,” Geophysics 66
(1/1/2001)CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Recent modeling techniques for fluid flow in a reservoir or an aquifer require characterizing the statistics of the spatial variability of physical ... -
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Crustal imaging in southern California using earthquake sequences
(3/10/1998)An inexpensive means to further understand the geometry of active faults in southern California arises from the use of aftershock recordings to image crustal structures. The advent of regional seismic networks that record ... -
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Depth to bedrock using gravimetry in the Reno and Carson City, Nevada, area basins
(3/1/2000)Sedimentary basins can trap earthquake surface waves and amplify the magnitude and lengthen the duration of seismic shaking at the surface. Poor existing gravity and well-data coverage of the basins below the rapidly growing ... -
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Detailed fault structure highlighted by finely relocated aftershocks, Arthur's Pass, New Zealand
(9/1/2006)More than 6000 aftershocks were recorded following the 1994 Arthur's Pass Mw6.7 earthquake in South Island, New Zealand. Here we relocate over 3500 of the aftershocks using double-difference tomography to map detailed fault ... -
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Evidence of an early projectile point technology in North America at the Gault Site, Texas, USA
(2018)American archeology has long been polarized over the issue of a human presence in the Western Hemisphere earlier than Clovis. As evidence of early sites across North and South America continues to emerge, stone tool ... -
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Faster, Better: Shear-Wave Velocity to 100 Meters Depth from Refraction Microtremor Arrays
(4/1/2001)Current techniques of estimating shallow shear velocities for assessment of earthquake site response are too costly for use at most construction sites. They require large sources to be effective in noisy urban settings or ... -
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Fault slip in southern California
(6/1/1985)Measurements of slip on major faults in southern California have been performed over the past 18 yr using principally theodolite alignment arrays and tautwire extensometers. They provide geodetic control within a few hundred ... -
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Geometrical focusing as a mechanism for significant amplification of ground motion in sedimentary basins: analytical and numerical study
(4/1/2014)We study the geometrical and material conditions which lead to focusing of seismic waves traveling across a concave velocity interface representing the boundary of a sedimentary basin within a denser rock. We approximate, ...