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Preliminary noise survey and data report of Saudi Arabian data

Description: From November 1995 to March 1996 a total of 9 broadband temporary stations were deployed across Saudi Arabian shield. These stations consisted of STS-2 seismometers recorded continuously at 40 sps on RefTek dataloggers. All installations were at bedrock sites. Using data sections selected randomly during the deployment, noise studies showed that most stations were exceptionally quiet with noise level near the USGS low noise model for frequencies higher than 0.1 Hz. At lower frequencies, the hor… more
Date: August 1, 1997
Creator: Mellors, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Seismic reflection imaging of underground cavities using open-source software

Description: The Comprehensive Nuclear Test Ban Treaty (CTBT) includes provisions for an on-site inspection (OSI), which allows the use of specific techniques to detect underground anomalies including cavities and rubble zones. One permitted technique is active seismic surveys such as seismic refraction or reflection. The purpose of this report is to conduct some simple modeling to evaluate the potential use of seismic reflection in detecting cavities and to test the use of open-source software in modeling … more
Date: December 20, 2011
Creator: Mellors, R J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

INVESTIGATION OF CRUSTAL MOTION IN THE TIEN SHAN USING INSAR

Description: The northern Tien Shan of Central Asia is an area of active mid-continent deformation. Although far from a plate boundary, this region has experienced 5 earthquakes larger than magnitude 7 in the past century and includes one event that may as be as large as Mw 8.0. Previous studies based on GPS measurements indicate on the order of 23 mm/yr of shortening across the entire Tien Shan and up to 15 mm/year in the northern Tien Shan (Figure 1). The seismic moment release rate appears comparable wit… more
Date: February 25, 2011
Creator: Mellors, R J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

HIGH-RESOLUTION SEISMIC VELOCITY AND ATTENUATION MODELS OF THE CAUCASUS-CASPIAN REGION

Description: The southwest edge of Eurasia is a tectonically and structurally complex region that includes the Caspian and Black Sea basins, the Caucasus Mountains, and the high plateaus south of the Caucasus. Crustal and upper mantle velocities show great heterogeneity in this region and regional phases display variations in both amplitudes and travel time. Furthermore, due to a lack of quality data, the region has largely been unexplored in terms of the detailed lithospheric seismic structure. A unified h… more
Date: July 10, 2007
Creator: Mellors, R; Gok, R & Sandvol, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detecting and monitoring UCG subsidence with InSAR

Description: The use of interferometric synthetic aperture radar (InSAR) to measure surface subsidence caused by Underground Coal Gasification (UCG) is tested. InSAR is a remote sensing technique that uses Synthetic Aperture Radar images to make spatial images of surface deformation and may be deployed from satellite or an airplane. With current commercial satellite data, the technique works best in areas with little vegetation or farming activity. UCG subsidence is generally caused by roof collapse, which … more
Date: March 23, 2012
Creator: Mellors, R J; Foxall, W & Yang, X
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Land subsidence in the Cerro Prieto Geothermal Field, 1 Baja California, Mexico, from 1994 to 2005. An integrated analysis of DInSAR, levelingand geological data.

Description: Cerro Prieto is the oldest and largest Mexican geothermal field in operation and has been producing electricity since 1973. The large amount of geothermal fluids extracted to supply steam to the power plants has resulted in considerable deformation in and around the field. The deformation includes land subsidence and related ground fissuring and faulting. These phenomena have produced severe damages to infrastructure such as roads, irrigation canals and other facilities. In this paper, the tech… more
Date: March 3, 2011
Creator: Sarychikhina, O; Glowacka, E; Mellors, R & Vidal, F S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Report: Detection and Characterization of Underground Facilities by Stochastic Inversion and Modeling of Data from the New Generation of Synthetic Aperture Satellites

Description: Many clandestine development and production activities can be conducted underground to evade surveillance. The purpose of the study reported here was to develop a technique to detect underground facilities by broad-area search and then to characterize the facilities by inversion of the collected data. This would enable constraints to be placed on the types of activities that would be feasible at each underground site, providing a basis the design of targeted surveillance and analysis for more c… more
Date: February 27, 2012
Creator: Foxall, W; Cunningham, C; Mellors, R; Templeton, D; Dyer, K & White, J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SPE2 Far-field Seismic Data Quicklook

Description: The purpose of this report is to provide a brief overview of the far-field seismic data collected by the array of instruments (Figures 1 and 2) deployed by the Source Physics experiment for shots 1 (roughly 100 kg TNT equivalent at a depth of 60 m) and shot 2, (roughly 2000 kg TNT equivalent at a depth of 45 m). 'Far-field' is taken to refer to instruments in the zone of purely elastic response at distances of 100 m or greater. The primary focus is data from the main instrument array and hence … more
Date: February 14, 2012
Creator: Mellors, R. J.; Harben, P.; Ford, S.; Walter, W. R.; Hauk, T.; Ruppert, S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Initial source and site characterization studies for the U. C. San Diego campus

Description: The basic approach of the Campus Laboratory Collaboration (CLC) project is to combine the substantial expertise that exists within the University of California (UC) system in geology, seismology, geotechnical engineering, and structural engineering to evaluate the effects of large earthquakes on UC facilities. These estimates draw upon recent advances in hazard assessment, seismic wave propagation modeling in rocks and soils, dynamic soil testing, and structural dynamics. The UC campuses curren… more
Date: July 1, 1999
Creator: Day, S.; Erick, F.; Heuze, F.E.; Mellors, R.; Minster, B.; Park, S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pre-shot simulations of far-field ground motion for the Source Physics Experiment (SPE) Explosions at the Climax Stock, Nevada National Security Site: SPE2

Description: The Source Physics Experiment (SPE) is planning a 1000 kg (TNT equivalent) shot (SPE2) at the Nevada National Security Site (NNSS) in a granite borehole at a depth (canister centroid) of 45 meters. This shot follows an earlier shot of 100 kg in the same borehole at a depth 60 m. Surrounding the shotpoint is an extensive array of seismic sensors arrayed in 5 radial lines extending out 2 km to the north and east and approximately 10-15 to the south and west. Prior to SPE1, simulations using a fin… more
Date: October 18, 2011
Creator: Mellors, R J; Rodgers, A; Walter, W; Ford, S; Xu, H; Matzel, E et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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