A Discrimination Analysis of Regional Seismic Data Recorded at Tonto Forest Observatory from Nevada Test Site Explosions and Nearby Earthquakes

1981 ◽  
Author(s):  
J. R. Murphy ◽  
T. J. Bennett ◽  
T. K. Tzeng
Keyword(s):  
Seismic Data ◽  
Test Site ◽  
Nevada Test Site ◽  
Discrimination Analysis

scholarly journals Recovery and Calibration of Legacy Underground Nuclear Test Seismic Data from the Leo Brady Seismic Network

2020 ◽  
Vol 91 (3) ◽  
pp. 1488-1499 ◽  
Author(s):  
Brian A. Young ◽  
Robert E. Abbott
Keyword(s):  
United States ◽  
Seismic Data ◽  
Test Site ◽  
The United States ◽  
Seismic Network ◽  
Nevada Test Site ◽  
Data Format ◽  
Weight Lift ◽  
Poles And Zeros ◽  
Full Waveforms

Abstract The Leo Brady Seismic Network (LBSN, originally the Sandia Seismic Network) was established in 1960 by Sandia National Laboratories to monitor underground nuclear tests (UGTs) at the Nevada National Security Site (NNSS, formerly named the Nevada Test Site). The LBSN has been in various configurations throughout its existence, but it has generally been comprised of four to six stations at regional distances (∼150–400  km) from the NNSS with approximately evenly spaced azimuthal coverage. Between 1962 and the end of nuclear testing in 1992, the LBSN—and a sister network operated by Lawrence Livermore National Laboratories—was the most comprehensive United States source of regional seismic data of UGTs. Approximately 75% of all UGTs performed by the United States occurred in the predigital era. At that time, LBSN data were transmitted as frequency-modulated (FM) audio over telephone lines to a central location and recorded as analog waveforms on high-fidelity magnetic audio tapes. These tapes have been in dry temperature-stable storage for decades and contain the sole record of this irreplaceable data; full waveforms of LBSN-recorded UGTs from this era were not routinely digitized or otherwise published. We have developed a process to recover and calibrate data from these tapes. First, we play back and digitize the tapes as audio. Next, we demodulate the FM “audio” into individual waveforms. We then estimate the various instrument constants through careful measurement of “weight-lift” tests performed prior to each UGT on each instrument. Finally, these coefficients allow us to scale and shape the derived instrument response of the seismographs and compute poles and zeros. The result of this process is a digital record of the recorded seismic ground motion in a modern data format, stored in a searchable database. To date, we have digitized tapes from 592 UGTs.

Properties of Oak Spring formation in Area 12 at the Nevada Test Site

1959 ◽  
Author(s):  
W.H. Diment ◽  
R.E. Wilcox ◽  
G.V. Keller ◽  
E. Dobrovolny ◽  
F.C. Kracek ◽  
...  
Keyword(s):  
Test Site ◽  
Nevada Test Site

A catalog of seismicity within 400 km of the Nevada Test Site

1976 ◽  
Author(s):  
A.M. Rogers ◽  
David M. Perkins ◽  
F.A. McKeown
Keyword(s):  
Test Site ◽  
Nevada Test Site
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