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Title: Dynamics of the Sandia Type 23 Seismic System and its suitability for digital recording of regional seismic events

Abstract

The Sandia Type 23 Seismic System consists of a 1.25 Hz seismometer which is made to have the characteristics of a 20 second Seismometer by a combination of overdamping, compensating filters, and electronic gain. We have analyzed the dynamics of the Type 23 Seismic System, and our results indicate that long-period system noise is considerably greater than the noise of a conventional long-period seismometer due to 1) reduced motion of the mass at low-frequencies, 2) the large electronic gain required to extend the low-frequency response out to 0.1 Hz, and 3) increased suspension noise. Using the event Nessel, the seismograms recorded by the Type 23 seismic System at Leeds are compared to those recorded by the conventional 20 second period system at Kanab. The long period (> 10 sec) S/N ratio at Leeds is visibly lower than at Kanab. The Type 23 System is not a good candidate for digital recording of regional events because of the poor long period S/N ratio.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
5891551
Report Number(s):
UCID-19212
ON: DE82001759
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; SEISMOGRAPHS; COMPARATIVE EVALUATIONS; PERFORMANCE TESTING; DIGITAL SYSTEMS; SEISMIC DETECTION; SIGNAL-TO-NOISE RATIO; DETECTION; MEASURING INSTRUMENTS; SEISMIC ARRAYS; SEISMIC DETECTORS; TESTING; 580201* - Geophysics- Seismology & Tectonics- (1980-1989)

Citation Formats

Rodgers, P W, and Patton, H J. Dynamics of the Sandia Type 23 Seismic System and its suitability for digital recording of regional seismic events. United States: N. p., 1981. Web.
Rodgers, P W, & Patton, H J. Dynamics of the Sandia Type 23 Seismic System and its suitability for digital recording of regional seismic events. United States.
Rodgers, P W, and Patton, H J. Tue . "Dynamics of the Sandia Type 23 Seismic System and its suitability for digital recording of regional seismic events". United States.
@article{osti_5891551,
title = {Dynamics of the Sandia Type 23 Seismic System and its suitability for digital recording of regional seismic events},
author = {Rodgers, P W and Patton, H J},
abstractNote = {The Sandia Type 23 Seismic System consists of a 1.25 Hz seismometer which is made to have the characteristics of a 20 second Seismometer by a combination of overdamping, compensating filters, and electronic gain. We have analyzed the dynamics of the Type 23 Seismic System, and our results indicate that long-period system noise is considerably greater than the noise of a conventional long-period seismometer due to 1) reduced motion of the mass at low-frequencies, 2) the large electronic gain required to extend the low-frequency response out to 0.1 Hz, and 3) increased suspension noise. Using the event Nessel, the seismograms recorded by the Type 23 seismic System at Leeds are compared to those recorded by the conventional 20 second period system at Kanab. The long period (> 10 sec) S/N ratio at Leeds is visibly lower than at Kanab. The Type 23 System is not a good candidate for digital recording of regional events because of the poor long period S/N ratio.},
doi = {},
url = {https://www.osti.gov/biblio/5891551}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {9}
}

Technical Report:
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