HR: 0804h
AN: NS11E-0836    [Abstracts]
TI: A High-Resolution Seismic Survey Across the State Line fault, NV
AU: * Beachly, M
EM: mbeachly@hastings.edu
AF: Department of Physics, Hastings College, 710 N. Turner, Hastings, NE 68901, United States
AU: Cox, C M
EM: cmc3h@mtsu.edu
AF: Department of Geoscience, Middle Tennessee State University, 1500 Greenland Dr., Murfreesboro, TN 37172, United States
AU: Saldana, S C
EM: ssaldana@ees.nmt.edu
AF: Earth and Environmental Science Department, 801 Leroy Place, Socorro, NM 87801, United States
AU: Snelson, C M
EM: snelson@ees.nmt.edu
AF: Earth and Environmental Science Department, 801 Leroy Place, Socorro, NM 87801, United States
AU: Taylor, W J
EM: wanda.taylor@unlv.edu
AF: Department of Geoscience, University of Nevada Las Vegas, 4505 Maryland Parkway, MS 4010, Las Vegas, NV 89154-4010, United States
AU: Robins, C
EM: robinsc@unlv.nevada.edu
AF: Department of Geoscience, University of Nevada Las Vegas, 4505 Maryland Parkway, MS 4010, Las Vegas, NV 89154-4010, United States
AU: Davis, R
EM: davisr17@unlv.nevada.edu
AF: Department of Geoscience, University of Nevada Las Vegas, 4505 Maryland Parkway, MS 4010, Las Vegas, NV 89154-4010, United States
AU: Stropky, M
EM: stropkym@unlv.nevada.edu
AF: Department of Geoscience, University of Nevada Las Vegas, 4505 Maryland Parkway, MS 4010, Las Vegas, NV 89154-4010, United States
AU: Phillips, R
EM: phill203@nevada.edu
AF: Department of Civil and Environmental Engineering, University of Nevada Las Vegas, 4505 Maryland Parkway, MS 4015, Las Vegas, NV 89154-4015,
AU: Cothrun, C
EM: chris.cothrun@unlv.edu
AF: Department of Civil and Environmental Engineering, University of Nevada Las Vegas, 4505 Maryland Parkway, MS 4015, Las Vegas, NV 89154-4015,
AB: During the summer of 2007, an investigation of the faulting in Stewart Valley was under taken, located within the central Basin and Range province ~90 km west of Las Vegas, Nevada. The goal of this study was to resolve the seismic hazard potential of the State Line fault, a right-lateral strike-slip fault that runs the length of Stewart Valley. Four seismic reflection lines were acquired, two perpendicular and two parallel to the State Line fault. What is presented is an analysis of the western and eastern seismic lines parallel to the State Line fault. The western line was acquired utilizing a 144-channel geode system with each of the 4.5 Hz vertical geophones set out at 5 m intervals to form a 715 m long profile. The eastern line employed 120 of these geophones in a 595 m long profile. A mini-vibroseis served as the seismic source every ten meters, between geophones. The vibroseis was programmed to produce an 8 s linear sweep from 20-160 Hz. Three sweeps were recorded at each shot location without acquisition filters at a sampling rate of 0.5 ms. The three shot gathers were then stacked at each location to reduce noise. The data collected had minimal noise, although; during the processing of the eastern line a notch filtered was used to remove the 60 Hz noise created by adjacent power line. These lines, acquired parallel to the State Line fault, contain matching features that serve to determine how much lateral displacement the fault has undergone. The amount of the displacement can indicate how active the fault is, and thus, what magnitude of earthquake can be expected in the future. This will in turn contribute to determining the seismic hazard potential for southern Nevada. A preliminary interpretation of the seismic reflection sections indicates an average displacement of about 20 - 38 m with greater displacement in the deeper sections of the image. The shallow depth displacement calculations are consistent with previous work in the area. The State Line fault is believed to be a result of strain partitioning from the San Andreas Fault. By studying this more localized active strike-slip fault system the results of this study can contribute to a model that provides a better understanding of the tectonics in the central Basin and Range.
DE: 0900 EXPLORATION GEOPHYSICS
DE: 0910 Data processing
DE: 0935 Seismic methods (3025, 7294)
DE: 8107 Continental neotectonics (8002)
DE: 8111 Continental tectonics: strike-slip and transform
SC: Near-Surface Geophysics [NS]
MN: 2007 Fall Meeting