| SPECIAL Data Collection System. |
30 NOV 1979 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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 | The Special Data Collection System (SDCS) program, is an extension of work begun under the Long-Range Seismic Measurements (LRSM) program in 1960. The work is directed primarily toward collection of high quality seismic data for the development of seismic techniques necessary to detect and identify underground nuclear explosions. In addition, the program also involves related special studies such as instrumentation development and special field studies using the equipment and capabilities ... |
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| Final Report, Contract F08606-79-C-0023. |
15 NOV 1979 |
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| Authors:
W. D. Ballard; TELEDYNE GEOTECH GARLAND TEX
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| This report describes the work to purchase, improve the transportability and evaluate a lightweight air percussion drill rig for use in preparing 50-foot deep (15 meter) boreholes cased with 4.5 inch O. D. casing. The drilling rig was purchased from a foreign manufacturer and modified to incorporate dual purpose carrying handle and wheel axle stubs on the major rig components. Other components and modifications to improve transportability and field performance ... |
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| Special Data Collection Systems (Project T/4703. |
15 MAY 1979 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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| The work performed under Project T/4703, Special Data Collection Systems, during the period from October 1978 through March 1979 is described. The present program is an extension of the program which began in 1973 under Contract F08606-74-C-0013. At the start of this period, one SDCS unit remained in operation at a site near Rio Blanco, Colorado. Also, three systems were being set up at Oak Springs Butte, Nevada; Rulison, Colorado; ... |
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| Special Data Collection Systems (Project T/4703). |
29 SEP 1978 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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| Work performed under Project T/4703, Special Data Collection Systems, is an extension of the program begun in 1973 under Contract F08606-74-C-0013. At the start of this period SDCS systems remained in operation at four sites. Two sites record short-period data on analog tape only; the Rio Blanco Colo., configuration is the same except that data are also recorded on the digital recorder. At the 4th site, both short-period and long-period ... |
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| Special Data Collection Systems (Project T/4703). |
12 MAY 1978 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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| The work performed under Project T/4703, Special Data Collection Systems, during the period from October 1977 through March 1978 is described. At the start of this period SDCS systems remained in operation at five sites. These were Tatum Dome, Mississippi; Gasbuggy, New Mexico; Houlton, Maine; Red Lake, Ontario; and Oak Springs Butte, Nevada. The first two sites record short-period data on analog tape only. Both short-period and long-period data are ... |
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| Special Data Collection Systems. |
22 DEC 1977 |
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| Authors:
John R. Sherwin; TELEDYNE GEOTECH GARLAND TEX
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| Work performed under Project T/4703, Special Data Collection Systems, is described. Under the primary data collection task five portable seismograph systems were routinely operated at ten sites during the period from early 1975 through September 1977. Three additional systems were placed in operation in May and June 1977, and also remained operational through the contract period. The systems were operational for a total of 157 team months. Three special projects ... |
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| Special Data Collection Systems (Project T/4703) January through Jun 1977. |
31 JUL 1977 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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| Two SDCS systems which were deployed in early 1975 remained in operation at their original sites. These sites are at Houlton, Maine, and Red Lake, Ontario. The Houlton site uses a Model 36000 borehole seismometer system and the Red Lake Site uses standard SDCS (surface) instrumentation. Three SDCS systems remained in operation at the Nevada Test Site (NTS). These systems record short-period data only on both analog and digital recorders. ... |
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| Semiannual Report, Project T/4703 Special Data Collection Systems. |
31 JAN 1977 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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| Two SDCS (Special Data Collection Systems) systems which were deployed in early 1975 remained in operation at their original sites. These sites are at Houlton, Maine, and Red Lake, Ontario. The Houlton site uses a Model 36000 borehole seisometer system and the Red Lake site uses standard SDCS (surface) instrumentation. Both sites collect three-component data from long- and short-period systems. The sites at Cumberland Plateau Observatory, Tennessee; Franklin, West Virginia; ... |
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| Operation of the Tonto Forest Seismological Observatory. |
02 AUG 1976 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
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| This report of the work accomplished on Project VELA T/4704 describes: (1) The operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located near Payson, Arizona; (2) The research and test functions carried out at the TFSO; and (3) The research tasks performed by the Geotech staff in Garland, Texas, using TFSO data. Actual operation of the Observatory was terminated on 28 February 1975. Retrieval and disposition of ... |
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| Semiannual Report, Project T/4703, Special Data Collection Systems, January through June 1976, |
30 JUL 1976 |
25 pages |
| Authors:
John R. Sherwin; TELEDYNE GEOTECH GARLAND TEX
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 | Five SDCS systems which had been deployed in early 1975 continued routine operations throughout the report period. Sites at Red Lake, Ontario, and Whitehorse Yukon, are standard SDCS units; the site at Cumberland Plateau Observatory in Tennessee uses that station's SP array as its SP input. The Franklin, West Virginia, and Houlton, Maine sites use a Model 36000 Borehole Seismometer System. The five stations have routinely collected seismic data on ... |
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| Shallow Borehole Convection Noise Study. |
30 JUN 1976 |
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| Authors:
John R. Sherwin; john c. cook; TELEDYNE GEOTECH GARLAND TEX
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| The purpose of this study was to determine the cause or causes of extraneous noise on the horizontal channels of the Borehole Seismometer System, Model 36000, and to develop methods of reducing or eliminating this noise. Similar noise had been observed on other borehole seismographs in the past and was later found to have been caused by the action of convection cells in the air within the sealed borehole. The ... |
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| Semi-Annual Report, Project T/4703 Special Data Collection Systems July through December 1975, |
30 MAR 1976 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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| The work performed under Project T4703, Special Data Collection Systems, during the period from 1 July through 31 December 1975 is described. Five SDCS systems which had been deployed in early 1975 continued routine operations throughout the report period. Sites at Red Lake, Ontario, and Whitehorse, Yukon, the standard SDC units; the site at Cumberland Plateau Observatory in Tennessee uses that station's SP array as its SP input. The Franklin, ... |
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| Source-Region/Station Time Corrections for the Eastern Himalayan Region. |
NOV 1975 |
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| Authors:
Jack G. Swanson; TELEDYNE GEOTECH GARLAND TEX
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| Source-region/station time corrections are developed for the eastern Himalayan region and 181 stations, including 48 stations of the World Wide Standard Seismograph Network. The study area encompasses the area within about 15 degrees of 30N 95E and includes the Himalayan front, the Tibetan platform and parts of the Central China fold system, the North China-Korean platform, the Burmese arc, the Indochina fold system, and the South China platform. For teleseismic ... |
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| Earth Noise in the 20- to 100-Second Period Range. |
09 SEP 1975 |
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| Authors:
E. J. Douze; TELEDYNE GEOTECH GARLAND TEX
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| Experiments to investigate the sources of seismic noise in the period range of 20 to 100 seconds have been conducted at three observatories, Grand Saline and McKinney, Texas and Pinedale, Wyoming. For surface seismographs the main contributor to the noise is quasi-static earth motion caused by wind-generated pressure variations. These pressure variations were recorded by microbarographs and shown to be linearly related to the noise recorded by seismographs during windy ... |
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| Semi-Annual Report, Project T/4703 Special Data Collection Systems January through June 1975, |
30 JUN 1975 |
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| Authors:
John R. Sherwin; TELEDYNE GEOTECH GARLAND TEX
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| The work performed under Project T/4703, Special Data Collection Systems, during the period from 1 January through 30 June 1975 is described. In addition, a summary of work done under this contract since its inception in August 1973 is presented. Five SDCS systems were deployed in February and March to sites in the Continental U.S. and Canada which had been previously occupied. Sites at Houlton, Maine; Red Lake, Ontario; and ... |
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| Operation of the Tonto Forest Seismological Observatory. |
07 MAY 1975 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
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| The report describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO), located near Payson, Arizona, the research and test functions carried out at the TFSO, and the research tasks performed by the Geotech staff in Garland, Texas, using TFSO data. |
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| Deep Borehole Operation of the Borehole Seismometer System, Model 36000. |
15 MAR 1975 |
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| Authors:
E. J. Douze; John R. Sherwin; TELEDYNE GEOTECH GARLAND TEX
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| The project described was concerned primarily with, first, the modification of the Borehole Seismograph System, Model 36000, to operate under the high pressure and high temperature environment encountered in boreholes up to 3000 m (10,000 ft) deep, and secondly, various studies of signals and noise as a function of depth. Modification of the instrument, along with required auxiliary equipment was relatively straightforward and consisted primarily of substitution of high-reliability, 105C ... |
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| Operation of the Tonto Forest Seismological Observatory. |
07 FEB 1975 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
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| The resport discusses the work accomplished on Project VT/4704 from 1 October through 31 December 1974. It describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO), located near Payson, Arizona, the research and test functions carried out at the TFSO, and the research tasks performed by the Geotech staff in Garland, Texas, using TFSO data. |
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| S/P Travel Time Ratio in Central Asia. |
NOV 1974 |
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| Authors:
Jack G. Swanson; TELEDYNE GEOTECH GARLAND TEX
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| The S/P travel time ratio for intermediate depth Hindu-Kush earthquakes and shallow earthquakes in the Hindu-Kush, Pamir, and Tien Shan regions is investigated, using S and P arrival times at 6 World Wide Standard Seismograph Network stations and 19 other close-in stations. For intermediate depth earthquakes, station mean values of the ratio average 1.78, ranging from 1.76 to 1.81. The ratio increases slowly with increasing distance over the range 4.5 ... |
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| Final Report, Project T/3703 August 1972 through January 1974, |
24 SEP 1974 |
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| Authors:
John R. Sherwin; George C. Kraus; TELEDYNE GEOTECH GARLAND TEX
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| Ten portable seismograph systems were deployed to record data from the Project RIO BLANCO detonation. A preliminary visual analysis of the data recorded at the field sites was performed. Three Task Change Proposals were accepted by the Project Office and a considerable portion of the total effort of this project was devoted to these tasks. A program to test and evaluate the Borehole Seismometer System, Model 36000, was conducted. In ... |
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| S/P Travel Time Ratio in Central Asia. |
SEP 1974 |
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| Authors:
Jack G. Swanson; TELEDYNE GEOTECH GARLAND TEX
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| The S/P travel time ratio for intermediate depth Hindu-Kush earthquakes is investigated, using S and P arrival times at six World Wide Standard Seismograph Network stations and 19 other close-in stations. Station mean values of the ratio range from 1.74 to 1.81, with an overall mean value of 1.78. The S/P travel time ratio increases slowly with increasing distance over the distance range 4.5 to 13.0 degrees, and increases rapidly ... |
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| Studies of Long-Period Seismic Noise Generated by Atmospheric Pressure Changes. |
01 AUG 1974 |
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| Authors:
G. G. Sorrells; E. J. Douze; TELEDYNE GEOTECH GARLAND TEX
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| Potential contribution of atmospheric pressure sources other than the wind to the seismic noise spectrum in the 20-100 second period range was studied. Results indicate that during calm intervals in the winter months, pressure related earth motion makes a substantial contribution to the observed earth noise spectrum. This contribution becomes detectable at periods on the order of 25 seconds and becomes the principal source of ambient earth motion at periods ... |
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| Strain/Inertial Seismograph Complexes. |
05 Mar 1974 |
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| Authors:
James E Fix; TELEDYNE GEOTECH GARLAND TEX
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| The purposes of this report are to present the results of a comprehensive review of the state-of-the-art of strain seismographs and their applications and to present the cost/performance tradeoffs between spatial arrays and strain/inertial arrays. The review included: strain seismometer operating characteristics, present designs, and possible future designs; installation methods, techniques, and configurations; applications of combined strain and inertial seismograms including detection thresholds of the prototype station; the character and ... |
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| Operation of the Tonto Forest Seismological Observatory. |
20 SEP 1973 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
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| This is a report of the work accomplished on Project VT/3704 from 1 July 1972 through 30 June 1973. Project VT/3704 includes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located near Payson, Arizona. It also includes information about research and test activities carried out at the TFSO and at Garland, Texas, using TFSO data. (Author) |
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| Electronic Measurement of Rock Stress. |
15 JUN 1973 |
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| Authors:
john c. cook; TELEDYNE GEOTECH GARLAND TEX
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| The objective of the program was to evaluate feasibility of non-destructive electronic measurement (and logging) of rock stress in situ, using atomic resonances that are pressure-sensitive. Nuclear quadrupole resonance (NQR) appeared clearly applicable, since no magnetic aligning field is needed, there are several common NQR-active nuclear species in major rock-forming minerals, and rf magnetic fields between 0.3 and 3 megahertz (the resonant frequencies) propagate well through many rocks. There are ... |
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| Operation of the Tonto Forest Seismological Observatory. |
30 APR 1973 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
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| The report describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located near Payson, Arizona, the research and test functions carried out at the TFSO, and the research and development tasks performed by the Garland, Texas, staff using TFSO data. (Modified author abstract) |
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| Operation of the Tonto Forest Seismological Observatory. |
20 JAN 1973 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
|
| The report describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located near Payson, Arizona, research and test functions carried out at the TFSO, and research and development tasks performed by the Garland, Texas, staff using TFSO data. (Author) |
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| Operation of the Tonto Forest Seismological Observatory. |
20 NOV 1972 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
|
| The report describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located Near Payson, Arizona, research and test functions carried out at the TFSO, and research and development tasks performed by the Garland, Texas, staff using TFSO data. (Author) |
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| Special Data Collection Systems. |
15 NOV 1972 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
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| The work performed under Project T/1703, Special Data Collection Systems Program, during the period 1 September 1970 through 30 September 1972 is described. Ten portable system teams were deployed to participate in the CANNIKIN experiment. The portable system instrumentation was modified to provide greater system sensitivity. The comparison study of the noise level recorded by long-period seismographs in two types of surface vaults indicates that the noise levels are virtually ... |
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| Operation of the Tonto Forest Seismological Observatory. |
07 NOV 1972 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
|
| The report describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located near Payson, Arizona, research and test functions carried out at the TFSO, and research and development tasks performed by the Garland, Texas, staff using TFSO data. (Author) |
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| Low Frequency Earth Motion Generated by Slowly Propagating, Partially Organized Pressure Fields. |
23 OCT 1972 |
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| Authors:
G. G. Sorrells; T. T. Goforth; TELEDYNE GEOTECH GARLAND TEX
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| General expressions for the transfer function and the coherence relating earth motion and atmospheric pressure variations observed at the surface are derived for the case where the pressure field is a random process which is stationary in both time and space. It is found that as long as the phase velocities of the pressure field are low in comparison to seismic wave velocities this transfer function will be a smoothed ... |
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| Long Range Seismic Measurements. |
23 MAY 1972 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
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| The progress of the Long-Range Seismic Measurements (LRSM) Program during the period 1 January 1970 through 31 October 1971 is described. At the beginning of the report period, there were seven mobile observatories and eleven portable seismograph systems in the LRSM program. These seismograph systems participated in related programs and experiments such as MIRACLE PLAY - HUMID WATER, HANDLEY, and CANNIKIN. Six portable strain systems were operated at the Nevada ... |
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| Operation of the Tonto Forest Seismological Observatory. |
15 APR 1972 |
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| Authors:
B. B. Leichliter; TELEDYNE GEOTECH GARLAND TEX
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| The report is of the work accomplished on Project VT/2704 from 1 January through 31 March 1972. It describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located near Payson, Arizona, research and test functions carried out at the TFSO, and research and development tasks performed by the Garland, Texas, staff using TFSO data. (Author) |
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| Alaskan Noise Field Investigation, March to June 1971. |
17 JAN 1972 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
|
| Noise in the 50-60 second period range, recorded by the Alaskan Long-Period Array during the winter months, was found to be caused by convection cells within the array boreholes. A technique for preventing formation of the cells was devised. Burial of ALPA seismometers was found to significantly reduce wind-generated horizontal seismic noise. Relationships between triaxial module pressure sensitivities and module installation techniques and between pressure sensitivity and module tilt were ... |
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| Analysis of Data from Six Portable Strainmeters in Southern Nevada. |
31 OCT 1971 |
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| Authors:
Robert C. Shopland; TELEDYNE GEOTECH GARLAND TEX
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| The report covers an analysis of secular strains over an annual cycle at six portable strain sites in southern Nevada as well as a study of the strain characteristics of signals from significant events recorded in the time interval 23 January 1970 through 31 July 1971. Measurements of quasi-static strains support the hypothesis that dynamic loading by the seismic waves from explosions and earthquakes trigger a local release of tectonic ... |
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| Operation of Tonto Forest Seismological Observatory. |
15 OCT 1971 |
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| Authors:
TELEDYNE GEOTECH GARLAND TEX
|
| The report is of the work accomplished on Project VT/2704 from 1 July through 30 September 1971. It describes the operation, evaluation, and improvement of the Tonto Forest Seismological Observatory (TFSO) located near Payson, Arizona, research and test functions carried out at the TFSO, and research and development tasks performed by the Garland, Texas, staff using TFSO data. (Author) |
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