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Now showing items 1-10 of 14
Inversion of travel-time data for earthquake locations and three-dimensional velocity structure in the Eureka Valley area, eastern California
We develop an earthquake travel-time inversion methodology suitable for determining three-dimensional velocity structure and fault-plane orientation for an area with limited a priori information. Using a cascaded combination ...
Crustal imaging in southern California using earthquake sequences
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 ...
Shear-wave velocity structure in the northern Basin and Range province from the combined analysis of receiver functions and surface waves
A new method based on the joint inversion of receiver functions and surface-wave phase velocities results in well-determined shear-velocity structures that are consistent with the compressional-wave structure, gravity, ...
Shallow geophysical survey across the Pahrump Valley Fault Zone, California-Nevada border
We employ seismic reflection, magnetics, and electromagnetics to locate precisely the southern extension of the Pahrump Valley Fault Zone (PVFZ) and examine its subsurface geometry. The southern extension of the PVFZ is ...
Velocity models for the highly extended crust of Death Valley, California
We employ nonlinear optimization to obtain shallow velocity structure from COCORP seismic reflection profiles in the highly extended Death Valley region, California. We also use group-velocity analysis of regional earthquake ...
A generalized simulated-annealing optimization for inversion of first-arrival times
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 ...
Seismicity in the western Great Basin apparently triggered by the Landers, California, earthquake, 28 June 1992
Within 24 hr after the Landers earthquake, there were three magnitude 3.4+ events in western Nevada and an unexpected, widespread increase in the rate of small events. Based on combined catalogs for northern Nevada, southern ...
Subsurface imaging of the Garlock Fault, Cantil Valley, California
Imaging of the Garlock fault from seismic reflection data tests tectonic models for the Mojave Desert region of southern California. Models developed from geologic and geodetic evidence of fault movement rates disagree on ...
Inversion of seismic reflection traveltimes using a nonlinear optimization scheme
We present the use of a nonlinear optimization scheme called generalized simulated annealing to invert seismic reflection times for velocities, reflector depths, and lengths. A finite?difference solution of the eikonal ...