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Insights into the Dynamic Response of Tunnels in Jointed Rocks

Description: Tunnels in jointed rocks can be subjected to severe dynamic loads because of rock bursts, coal bumps, and large earthquakes. A series of 3-dimensional simulations was performed, based on discrete element analysis to gain insights into the parameters that influence the response of such tunnels. The simulations looked at the effect of joint set orientation, the effect of joint spacing, the effect of pulse shape for a given displacement, and the influence of using rigid versus deformable blocks in… more
Date: November 1, 2004
Creator: Heuze, F E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Seismic Response Prediction of Nupec's Field Model Tests of Npp Structures With Adjacent Building Effect.

Description: As part of a verification test program for seismic analysis computer codes for Nuclear Power Plant (NPP) structures, the Nuclear Power Engineering Corporation (NUPEC) of Japan has conducted a series of field model tests to address the dynamic cross interaction (DCI) effect on the seismic response of NPP structures built in close proximity to each other. The program provided field data to study the methodologies commonly associated with seismic analyses considering the DCI effect. As part of a c… more
Date: March 4, 2004
Creator: Xu, J.; Hofmayer, C. & Ali, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evolution of the Regional Coda Methodology

Description: For the past decade Lawrence Livermore National Laboratory (LLNL) and Los Alamos National Laboratory (LANL), have been developing and testing a stable, regional coda magnitude methodology for the determination of magnitude and yield. The motivation behind this research was to take advantage of the averaging nature of coda waves in support of monitoring small seismic events from a sparse regional seismic network (e.g., International Monitoring System (IMS) network). The methodology as described … more
Date: July 15, 2004
Creator: Mayeda, K; Philips, W; Malagnini, L & Dreger, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Laser- and Radar-based Mission Concepts for Suborbital and Spaceborne Monitoring of Seismic Surface Waves

Description: The development of a suborbital or spaceborne system to monitor seismic waves poses an intriguing prospect for advancing the state of seismology. This capability would enable an unprecedented global mapping of the velocity structure of the earth's crust, understanding of earthquake rupture dynamics and wave propagation effects, and event source location, characterization and discrimination that are critical for both fundamental earthquake research and nuclear non-proliferation applications. As … more
Date: September 21, 2004
Creator: Foxall, W; Schultz, C A & Tralli, D M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Test of a Strong Ground Motion Prediction Methodology for the 7 September 1999, Mw=6.0 Athens Earthquake

Description: We test a methodology to predict the range of ground-motion hazard for a fixed magnitude earthquake along a specific fault or within a specific source volume, and we demonstrate how to incorporate this into probabilistic seismic hazard analyses (PSHA). We modeled ground motion with empirical Green's functions. We tested our methodology with the 7 September 1999, Mw=6.0 Athens earthquake, we: (1) developed constraints on rupture parameters based on prior knowledge of earthquake rupture processes… more
Date: August 6, 2004
Creator: Hutchings, Lawrence; Ioannidou, Eleni; Voulgaris, Nicholas; Kalogeras, Ioannis; Savy, Jean; Foxall, William et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Proceedings of the 26th Seismic Research Review: Trends in Nuclear Explosion Monitoring

Description: These proceedings contain papers prepared for the 26th Seismic Research Review: Trends in Nuclear Explosion Monitoring, held 21-23 September, 2004 in Orlando, Florida. These papers represent the combined research related to ground-based nuclear explosion monitoring funded by the National Nuclear Security Administration (NNSA), Defense Threat Reduction Agency (DTRA), Air Force Research Laboratory (AFRL), US Army Space and Missile Defense Command, and other invited sponsors. The scientific object… more
Date: September 21, 2004
Creator: Chavez, Francesca C.; Benson, Jody; Hanson, Stephanie; Mark, Carol & Wetovsky, Marvin A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterize Eruptive Processes at Yucca Mountain, Nevada

Description: The purpose of this scientific analysis report, ''Characterize Eruptive Processes at Yucca Mountain, Nevada'', is to present information about natural volcanic systems and the parameters that can be used to model their behavior. This information is used to develop parameter-value distributions appropriate for analysis of the consequences of volcanic eruptions through a repository at Yucca Mountain. This scientific analysis report provides information to four other reports: ''Number of Waste Pac… more
Date: October 4, 2004
Creator: Krier, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Vibroseis Monitoring of San Andreas Fault in California

Description: A unique data set of seismograms for 720 source-receiver paths has been collected as part of a controlled source Vibroseis experiment San Andreas Fault (SAF) at Parkfield. In the experiment, seismic waves repeatedly illuminated the epicentral region of the expected M6 event at Parkfield from June 1987 until November 1996. For this effort, a large shear-wave vibrator was interfaced with the 3-component (3-C) borehole High-Resolution Seismic Network (HRSN), providing precisely timed collection of… more
Date: June 11, 2004
Creator: Korneev, Valeri & Nadeau, Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integrated High Resolution Microearthquake Analysis and Monitoring for Optimizing Steam Production at The Geysers Geothermal Field, California

Description: In December of 2003 a large amount of water from the Santa Rosa wastewater project began being pumped to The Geysers for injection. Millions of dollars are being spent on this injection project in the anticipation that the additional fluid will not only extend the life of The Geysers but also greatly increase the net amount of energy extracted. Optimal use of the injected water, however, will require that the water be injected at the right place, in the right amount and at the proper rate. It h… more
Date: April 26, 2004
Creator: Majer, Ernest; Peterson, John; Stark, Mitch; Smith, Bill; Rutqvist, Jonny & Kennedy, Mack
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Deep Vs Profiling Along the Top of Yucca Mountain Using a Vibroseis Source and Surface Waves

Description: Yucca Mountain, Nevada, was approved as the site for development of the geologic repository for high-level radioactive waste and spent nuclear fuel in the United States. The U.S. Department of Energy has been conducting studies to characterize the site and assess its future performance as a geologic repository. As part of these studies, a program of deep seismic profiling, to depths of 200 m, was conducted along the top of Yucca Mountain to evaluate the shear-wave velocity (V{sub s}) structure … more
Date: March 16, 2004
Creator: Stokoe, K.; Rosenblad, B.; Wong, I.; Bay, J.; Thomas, P. & Silva, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On The Impact of Borescope Camera Air Purge on DWPF Melter Off-Gas Flammability

Description: DWPF Engineering personnel requested that a new minimum backup film cooler air flow rate, which will meet the off-gas safety basis limits for both normal and seismic sludge-only operations, be calculated when the air purge to the borescope cameras is isolated from the melter. Specifically, it was requested that the latest calculations which were used to set the off-gas flammability safety bases for the sludge batch 2 and 3 feeds be revised, while maintaining all other process variables affectin… more
Date: July 22, 2004
Creator: CHOI, ALEXANDER
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of Earthquake Ground Motion Input for Preclosure Seismic Design and Postclosure Performance Assessment of a Geologic Repository at Yucca Mountain, NV

Description: This report describes a site-response model and its implementation for developing earthquake ground motion input for preclosure seismic design and postclosure assessment of the proposed geologic repository at Yucca Mountain, Nevada. The model implements a random-vibration theory (RVT), one-dimensional (1D) equivalent-linear approach to calculate site response effects on ground motions. The model provides results in terms of spectral acceleration including peak ground acceleration, peak ground v… more
Date: November 5, 2004
Creator: Wong, I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ground Motion Saturation Evaluation (GMSE) Data Needs Workshop

Description: The objective of the data needs workshop is to identify potential near-term (12-18 month) studies that would reduce uncertainty in extremely low probability (< 10{sup -5}/yr) earthquake ground motions at Yucca Mountain. Recommendations made at the workshop will be considered by BSC and DOE management in formulating plans for FY05 seismic-related investigations. Based on studies done earlier this year, a bound on peak ground velocities (PGVs), consisting of a uniform distribution from 150 cm/… more
Date: July 13, 2004
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bounding Peak Ground Velocities for Seismic Events at Yucca Mountain, Nevada

Description: Earthquake ground motions have been assessed using a probabilistic seismic hazard analysis (PSHA) of the proposed repository for spent nuclear fuel and high-level radioactive wastes at Yucca Mountain, Nevada. To meet the applicable regulations, consideration must be given to ground motions that have probabilities of exceedance as low as 10{sup -8}/yr. In the PSHA, aleatory variability in ground motion attenuation relations is characterized by unbounded lognormal distributions. At extremely low … more
Date: July 13, 2004
Creator: King, J.; Coppersmith, K. & Quittmeyer, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ground Motion Simulations To Investigate The Feasibility Of Space-Based Seismometry

Description: This report describes elastic finite-difference simulations of ground motion resulting from explosions and earthquakes for use in a Laboratory Directed Research and Development Feasibility Study (LDRD-FS). The results will be used to as input into further simulations of various spaced-based remote-sensing techniques, such as laser ranging and radar systems. The ground motion calculations involve two types of sources: shallow fully-coupled explosions at relatively shallow depth (1 km) and strike… more
Date: September 15, 2004
Creator: Rodgers, A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Probabilistic Seismic Hazard Analysis for Southern California Coastal Facilities

Description: The overall objective of this study was to develop probabilistic seismic hazard estimates for the coastal and offshore area of Ventura, Los Angeles and Orange counties for use as a basis for the University of Southern California (USC) to develop physical models of tsunami for the coastal regions and by the California State Lands Commission (SLC) to develop regulatory standards for seismic loading and liquefaction evaluation of marine oil terminals. The probabilistic seismic hazard analysis (PSH… more
Date: April 16, 2004
Creator: Savy, J & Foxall, B
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nonlinear Seismic Analysis of Morrow Point Dam: A Study for the United States Bureau of Reclamation

Description: This research and development project was sponsored by the United States Bureau of Reclamation (USBR), who are best known for the dams, power plants, and canals it constructed in the 17 western states. The mission statement of the USBR's Dam Safety Office, located in Denver, Colorado, is ''to ensure Reclamation dams do not present unacceptable risk to people, property, and the environment.'' The Dam Safety Office does this by quickly identifying the dams which pose an increased threat to the pu… more
Date: February 20, 2004
Creator: Noble, C R & Solberg, J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nonlinear Seismic Analysis of Morrow Point Dam

Description: This research and development project was sponsored by the United States Bureau of Reclamation (USBR), who are best known for the dams, power plants, and canals it constructed in the 17 western states. The mission statement of the USBR's Dam Safety Office, located in Denver, Colorado, is ''to ensure Reclamation dams do not present unacceptable risk to people, property, and the environment.'' The Dam Safety Office does this by quickly identifying the dams which pose an increased threat to the pu… more
Date: February 20, 2004
Creator: Noble, C R & Nuss, L K
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Annual Report for LDRD-04-FS-019 The Innermost Inner Core: Fact or Artifact?

Description: There is considerable debate in the Earth sciences over the composition, thermal history, and dynamics of Earth's inner core. The details of structural models are based on precious few seismological observations of PKP travel times, due to the uneven distribution of large earthquakes and recording stations around the globe. Using state-of-the-art signal-processing techniques to measure and compile a unique set of global travel time data of surface-reflected seismic waves that propagate through … more
Date: October 14, 2004
Creator: Tkalcic, H & Flanagan, M P
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Annual Hanford Seismic Report for Fiscal Year 2004

Description: This report describes seismic activity at and around the Hanford Site during Fiscal Year 2004. It is also the first description of seismic activity during the fourth quarter of FY04.
Date: December 7, 2004
Creator: Hartshorn, Donald C.; Reidel, Steve P. & Rohay, Alan C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Isotopic evidence of magmatism and a sedimentary carbon source at the Endeavour hydrothermal system

Description: Stable and radiocarbon isotope measurements made on CO{sub 2} from high temperature hydrothermal vents on the Endeavour Segment of the Juan de Fuca Ridge indicate both magmatic and sedimentary sources of carbon to the hydrothermal system. The Endeavour segment is devoid of overlying sediments and has shown no observable signs of surficial magmatic activity during the {approx}20 years of ongoing studies. The appearance of isotopically heavy, radiocarbon dead CO{sub 2} after a 1999 earthquake swa… more
Date: January 7, 2004
Creator: Brown, T A; Proskurowski, G & Lilley, M D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LDRD LW Project Final Report:Resolving the Earthquake Source Scaling Problem

Description: The scaling behavior of basic earthquake source parameters such as the energy release per unit area of fault slip, quantitatively measured as the apparent stress, is currently in dispute. There are compelling studies that show apparent stress is constant over a wide range of moments (e.g. Choy and Boatwright, 1995; McGarr, 1999; Ide and Beroza, 2001, Ide et al. 2003). Other equally compelling studies find the apparent stress increases with moment (e.g. Kanamori et al., 1993; Abercrombie, 1995; … more
Date: February 10, 2004
Creator: Mayeda, K; Felker, S; Gok, R; O'Boyle, J; Walter, W R & Ruppert, S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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