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in creator/contributor: "Harris, D B"

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Integrated Seismic Event Detection and Location by Advanced Array Processing

The principal objective of this two-year study is to develop and test a new advanced, automatic approach to seismic detection/location using array processing. We address a strategy to obtain significantly improved precision in the location of low-magnitude events compared with current fully-automatic approaches, combined with a low false alarm rate. We have developed and evaluated a prototype automatic system which uses as a basis regional array processing with fixed, carefully calibrated, site… more

Date: February 9, 2007

Creator: Kvaerna, T; Gibbons, S J; Ringdal, F & Harris, D B

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of KrF lasers for inertial confinement fusion

Recent reviews of the Inertial Confinement Fusion (ICF) program have resulted in recommendations that promise to focus the research effort on the examination of the feasibility of pellet ignition at 1 MJ of energy on target. If successful, the next major step in the program has been defined to be the construction of an Ignition Facility. Los Alamos National Laboratory has developed a plan to reach single-pulse multimegajoule ICF facilities using the electron-beam-pumped KrF laser. The Los Alamo… more

Date: January 1, 1990

Creator: Sullivan, J. A. & Harris, D. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

KrF lasers for inertial confinement fusion

The KrF laser has been proposed for inertial confinement fusion (ICF) since its discovery in 1975. Since that time, the laser has seen significant development and has been increased in energy many orders of magnitude to the several kilojoule energy level. The suitability of the KrF laser as a driver for ICF energy applications has been continually reviewed. The latest assessments indicate that the KrF laser still appears to be the leading laser candidate. A worldwide effort exists to advance th… more

Date: January 1, 1989

Creator: Harris, D. B.; Cartwright, D. C.; Figueira, J. F.; McDonald, T. E. & Sorem, M. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The next logical step in laser-fusion development

This paper discusses the present and future facilities for laser produced fusion energy. Cost and efficiency is the major underlying topic discussed. (LSP)

Date: January 1, 1988

Creator: Fenstermacher, C. A.; Harris, D. B.; Dudziak, D. J.; McDonald, T. E. & Cartwright, D. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mapping acoustic emissions from hydraulic fracture treatments using coherent array processing: Concept

Hydraulic fracturing is a widely-used well completion technique for enhancing the recovery of gas and oil in low-permeability formations. Hydraulic fracturing consists of pumping fluids into a well under high pressure (1000--5000 psi) to wedge-open and extend a fracture into the producing formation. The fracture acts as a conduit for gas and oil to flow back to the well, significantly increasing communication with larger volumes of the producing formation. A considerable amount of research has … more

Date: September 1, 1991

Creator: Harris, D. B.; Sherwood, R. J.; Jarpe, S. P. & Harben, P. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Final Scientific Report, Integrated Seismic Event Detection and Location by Advanced Array Processing

In the field of nuclear explosion monitoring, it has become a priority to detect, locate, and identify seismic events down to increasingly small magnitudes. The consideration of smaller seismic events has implications for a reliable monitoring regime. Firstly, the number of events to be considered increases greatly; an exponential increase in naturally occurring seismicity is compounded by large numbers of seismic signals generated by human activity. Secondly, the signals from smaller events be… more

Date: January 30, 2007

Creator: Kvaerna, T.; Gibbons, S. J.; Ringdal, F & Harris, D. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Data from deployment of temporary seismic stations in northern Norway and Finland

This short contribution is a description of data now available in NORSAR's data archives from a temporary deployment during 2002-2004 of six seismic stations in northern Norway and Finland. Explosions in underground as well as open-pit mines in the Khibiny massif of the Kola Peninsula of northwestern Russia are conducted on a frequent and relatively regular basis. It was decided to supplement the network of permanent stations in northern Fennoscandia and northwest Russia with temporarily deploy… more

Date: February 11, 2005

Creator: Maercklin, N; Mykkeltveit, S; Schweitzer, J; Harris, D B & Rock, D W

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Design and performance of future KrF laser-fusion facilities

The US inertial confinement fusion program is investigating the feasibility of constructing a high-gain Laboratory Microfusion Facility (LMF). Considerable uncertainties and risks exist for all of the driver candidates in proceeding directly to this facility without an intermediate step. These risks fall into the categories of driver performance and cost, target physics, and target chamber performance. Los Alamos has developed a plan to resolve these issues before construction of the LMF. The p… more

Date: January 1, 1989

Creator: Harris, D. B.; Sullivan, J. A. & Coggeshall, S. V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cost reduction possibilities for a heavy-ion accelerator for inertial confinement fusion

A design was produced for a single module in a cost-optimized accelerator appropriate for a commercial heavy-ion power plant. The goal of the study was to determine if the cost of the accelerator module could be reduced through design options, selection of materials, and manufacturing techniques. Independent cost estimates were obtained for the three main components of the module, and cost reductions of 20% from the cost calculated by the heavy-ion accelerator design/cost-minimization computer … more

Date: October 1, 1987

Creator: Thayer, G. R.; Sims, J. R.; Henke, M. D.; Harris, D. B.; Dudziak, D. J. & Phillips, N. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Passive Seismic Monitoring for Rockfall at Yucca Mountain: Concept Tests

For the purpose of proof-testing a system intended to remotely monitor rockfall inside a potential radioactive waste repository at Yucca Mountain, a system of seismic sub-arrays will be deployed and tested on the surface of the mountain. The goal is to identify and locate rockfall events remotely using automated data collecting and processing techniques. We install seismometers on the ground surface, generate seismic energy to simulate rockfall in underground space beneath the array, and interp… more

Date: March 3, 2003

Creator: Cheng, J.; Twilley, K.; Murvosh, H.; Tu, Y.; Luke, B.; Yfantis, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of seismic events in and near Kuwait

Seismic data for events in and around Kuwait were collected and analyzed. The authors estimated event moment, focal mechanism and depth by waveform modeling. Results showed that reliable seismic source parameters for events in and near Kuwait can be estimated from a single broadband three-component seismic station. This analysis will advance understanding of earthquake hazard in Kuwait.

Date: May 11, 1999

Creator: Harris, D B; Mayeda, K M; Rodgers, A J & Ruppert, S D

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

LLNL Identification Program: Regional Body-Wave Correction Surfaces and Surface-Wave Tomography Models to Improve Discrimination

LLNL identification research is focused on the problem of correctly discriminating small-magnitude explosions from a background of earthquakes, mining tremors, and other events. The goal is to reduce the variance within the population of each type of event, while increasing the separation between the explosions and the other event types. We address this problem for both broad categories of seismic waves: body waves and surface waves. First, we map out the effects of propagation and source size … more

Date: July 27, 2001

Creator: Walter, W.; Rodgers, A. J.; Pasyanos, M. E.; Mayeda, K. M.; Sicherman, A. & Harris, D. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

LLNL Location and Detection Research

We present two LLNL research projects in the topical areas of location and detection. The first project assesses epicenter accuracy using a multiple-event location algorithm, and the second project employs waveform subspace Correlation to detect and identify events at Fennoscandian mines. Accurately located seismic events are the bases of location calibration. A well-characterized set of calibration events enables new Earth model development, empirical calibration, and validation of models. In … more

Date: July 16, 2003

Creator: Myers, S C; Harris, D B; Anderson, M L; Walter, W R; Flanagan, M P & Ryall, F

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ground Truth Collections for Explosions in Northern Fennoscandia and Russia

This project is providing ground-truth information on explosions conducted at the principal mines within 500 kilometers of the ARCES station, and is assembling a seismic waveform database for these events from local and regional stations. The principal mines of interest are in northwest Russia (Khibiny Massif, Olenogorsk, Zapolyamy, and Kovdor groups) and Sweden (Malmberget, Kiruna). These mines form a natural laboratory for examining the variation of mining explosion observations with source t… more

Date: July 28, 2003

Creator: Harris, D B; Ringdal, F; Kremenetskaya, E; Mykkeltveit, S; Schweitzer, J.; Hauk, T et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

International Cooperation of Seismology for Support to the CTBT

No Description Available.

Date: July 5, 2011

Creator: Gok, R.; Nakanishi, K. K.; Pasyanos, M. E.; Rodgers, A. J.; Harris, D. B.; Vergino, E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Calibration of Regional Seismic Stations in the Middle East with Shots in Turkey

The objective of this project is to calibrate regional travel-times and propagation characteristics of seismic waves in Turkey and surrounding areas in the Middle East in order to enhance detection and location capabilities in the region. Important data for the project will be obtained by large calibration shots in central and eastern Turkey. The first, a two-ton shot, was fired in boreholes near Keskin in central Anatolia on 23 November 2002. The explosives were placed in 14 holes, each 80 m d… more

Date: July 21, 2003

Creator: Toksoz, M N; Kuleli, S; Gurbuz, C; Kalafat, D; Nekler, T; Zor, K et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ground Truth Collection for Mining Explosions in Northern Fennoscandia and Northwestern Russia

We concluded comprehensive ground truth collection at the Khibiny, Olenegorsk, Kovdor, and Zapolyarnyi mines, and have basic information on 2,052 explosions. In the past two years we used this ground truth information to extract waveform data from the ARCES array and a number of regional stations (KEV, LVZ, APA) as well as from six stations that we deployed along two lines stretching between the Khibiny Massif mines and the region around the ARCES array. We calculated P/S ratios using the ARCES… more

Date: July 13, 2005

Creator: Harris, D. B.; Ringdal, R.; Kremenetskaya, E.; Mykkeltveit, S.; Rock, D. W.; Maercklin, N. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Stochastic Engine: Direct Incorporation of Measurements Into Predictive Simulations

We are creating a new method of combining disparate types of geologic observations and process simulations. Using Bayesian inferencing and an efficient search algorithm, we obtain a consolidated body of knowledge in the form of multiple configurations and parameter values of the system that are consistent with our existing data and process models. In so doing, we effectively estimate the distributions of both individual parameters and system-wide states, and their likelihood of occurrence. This… more

Date: August 2, 2001

Creator: Newmark, R. L.; Aines, R. D.; Nitao, J. J.; Hanley, W. G.; Carle, S.; Ramirez, A. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent progress in the Los Alamos KrF Program

The goal of the Inertial Confinement Fusion Program (ICF) is to develop the ability to ignite and burn small masses of thermonuclear fuel. Although the present near-term objectives of the program are directed toward defense applications, ICF research continues to be carried out with a view to the longer term goal of commercial power production. The characteristics of a KrF laser make it an attractive candidate as an ICF driver. The KrF wavelength of 248 nm provides a target coupling that is ver… more

Date: January 1, 1988

Creator: McDonald, T. E.; Cartwright, D. C.; Coggeshall, S. V.; Fenstermacher, C. A.; Figueira, J. F.; Foreman, L. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Considerations on the Use of 3-D Geophysical Models to Predict Test Ban Monitoring Observables

The use of 3-D geophysical models to predict nuclear test ban monitoring observables (phase travel times, amplitudes, dispersion, etc.) is widely anticipated to provide improvements in the basic seismic monitoring functions of detection, association, location, discrimination and yield estimation. A number of questions arise when contemplating a transition from 1-D, 2-D and 2.5-D models to constructing and using 3-D models, among them: (1) Can a 3-D geophysical model or a collection of 3-D model… more

Date: July 9, 2007

Creator: Harris, D. B.; Zucca, J. J.; McCallen, D. B.; Pasyanos, M. E.; Flanagan, M. P.; Myers, S. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Considerations on the Use of 3-D Geophysical Models to Predict Test Ban Monitoring Observables

No Description Available.

Date: August 10, 2007

Creator: Harris, D. B.; Zucca, J. J.; McCallen, D. B.; Pasyanos, M. E.; Flanagan, M. P.; Myers, S. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

KrF laser path to high gain ICF (inertial confinement fusion) laboratory microfusion facility

The krypton-fluoride laser has many desirable features for inertial confinement fusion. Because it is a gas laser capable of operation with high efficiency, it is the only known laser candidate capable of meeting the driver requirements for inertial fusion energy (IFE) production. Los Alamos National Laboratory has defined a program plan to develop KrF lasers for IFE production. This plan develops the KrF laser and demonstrates the target performance in single-pulse facilities. A 100-kJ Laser T… more

Date: January 1, 1990

Creator: Harris, D. B.; Sullivan, J. A.; Figueiro, J. F.; Cartwright, D. C.; McDonald, T. E.; Hauer, A. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pulsed power considerations for electron beam pumped krypton fluoride lasers for inertial confinement fusion applications

The Los Alamos National Laboratory inertial confinement fusion (ICF) program is developing the krypton-fluoride excimer laser for use as an ICF driver. The KrF laser has a number of inherent characteristics that make it a promising driver candidate, such as short wavelength (0.25 {mu}m), broad bandwidth to target (>100 cm{sup {minus}1}), pulse-shaping with high dynamic range, and the potential for high overall efficiency (>5%) and repetitive operation. The large KrF laser amplifiers needed for … more

Date: January 1, 1991

Creator: Rose, E. A.; McDonald, T. E.; Rosocha, L. A.; Harris, D. B.; Sullivan, J. A. (Los Alamos National Lab., NM (USA)) & Smith, I. D. (Pulse Sciences, Inc., San Leandro, CA (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

KrF amplifier design issues and application to ICF system design

Los Alamos National Laboratory has assembled an array of experimental and theoretical tools to optimize amplifier design for future KrF lasers. The next opportunity to exercise these tools is with the design of the second generation NIKE system under construction at the Naval Research Laboratory with the collaboration of Los Alamos National Laboratory. Major issues include laser physics (energy extraction in large modules with amplified spontaneous emission) and diode performance and efficiency… more

Date: January 1, 1991

Creator: Sullivan, J. A.; Allen, G. R.; Berggren, R. R.; Czuchlewski, S. J.; Harris, D. B.; Jones, M. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department