scholarly journals A portable, long-period seismic recording system

1982 ◽  
Author(s):  
D.A. Stauber
Keyword(s):  
Recording System ◽  
Long Period ◽  
Seismic Recording

Development on Seismic Recording System

2013 ◽  
Author(s):  
Jian Guo ◽  
Shanhui Xu ◽  
Guangding Liu
Keyword(s):  
Recording System ◽  
Seismic Recording

scholarly journals Improvement of broadband seismic station installations at the Observatoire de Grenoble (OSUG) seismic network

2013 ◽  
Vol 34 ◽  
pp. 9-14 ◽  
Author(s):  
M. Langlais ◽  
B. Vial ◽  
O. Coutant
Keyword(s):  
Seismic Station ◽  
Seismic Network ◽  
Protection System ◽  
French Alps ◽  
Long Period ◽  
Seismic Recording ◽  
Seismic Networks

Abstract. We describe in this paper different improvements that were brought to the installation of seismic broadband stations deployed by the Observatoire de Grenoble (OSUG) in the northern French Alps. This work was realized in the frame of a French-Italian ALCOTRA project (RISE), aimed at modernizing the broadband seismic networks across our common border. We had the opportunity with this project to improve some of our seismic recording sites, both in term of sensor installation quality, and in term of reliability. We detail in particular the thermal and barometric protection system that we designed and show its effect on the reduction of long period noise above 20 s.

MUSIC: A demultiplexed digital seismic recording system

1983 ◽  
Author(s):  
H. M. J. Stagg ◽  
R. Whitworth ◽  
P. G. Crosthwaite ◽  
A. B. Devenish
Keyword(s):  
Recording System ◽  
Seismic Recording

A real-time digital seismic event detection and recording system for network applications

1982 ◽  
Vol 72 (6A) ◽  
pp. 2339-2348
Author(s):  
Andrew J. Michael ◽  
Stephen P. Gildea ◽  
Jay J. Pulli
Keyword(s):  
Real Time ◽  
Event Detection ◽  
Seismic Event ◽  
Weather Conditions ◽  
Recording System ◽  
Walsh Transform ◽  
Long Period ◽  
Short Period ◽  
Seismic Event Detection ◽  
Period Data

abstract A real-time digital seismic event detection and recording system has been developed for the MIT Seismic Network. The system has been designed specifically for an environment of low natural seismic activity and for surface stations which are often influenced by weather conditions and cultural noise. The system runs on an HP-1000 computer and can handle up to 16 channels of short- and long-period data. The structure of the system centers around the event detectors, one for short-period data and one for long-period data. These detectors base their decisions on a metric computed from the Walsh transform of the data. This allows them to detect changes in the amplitude of the waveform as well as frequency shifts. Detections at several stations are correlated to prevent glitches from triggering the detector. Present operation successfully saves those events that are large enough for analysis and leaves 23 of the computer available for general timesharing use.

DETERMINATION OF SEISMIC SYSTEM DISTORTION AND ITS COMPENSATION USING DIGITAL FILTERS

Geophysics ◽  
1968 ◽  
Vol 33 (2) ◽  
pp. 285-301 ◽  
Author(s):  
Russell L. Gray ◽  
J. Hans Leitinger ◽  
John C. Hollister
Keyword(s):  
Digital Filters ◽  
Signal To Noise Ratio ◽  
Recording System ◽  
Computational Technique ◽  
Seismic Recording ◽  
Exploration Tool ◽  
Velocity Impulse ◽  
Complete Amplitude ◽  
Amplitude Compensation ◽  
Seismic System

Distortion is inherent in recording seismic data. Although some distortion serves a useful purpose, distortion of desirable seismic events decreases resolution thereby reducing the effectiveness of the seismograph as an exploration tool. This paper describes an experimental‐computational technique to determine the distortion introduced by a seismic recording system. The technique utilizes a piezoelectric shaketable to obtain suitable input‐output pairs from which the velocity impulse response of the system is computed. Distortion introduced by the system is compensated by digital filters that are designed in the frequency domain. Nearly complete phase compensation is achieved by designing filters with phase characteristics that closely approximate the negative phase characteristics of the seismic system. Complete amplitude compensation is intentionally averted because of practical considerations. The degree of amplitude compensation deemed feasible is controlled by the relative frequency content of signal and noise. Synthetic examples which simulate field data indicate that approximate compensation filters are effective in removing much of the signal distortion introduced by the seismic recording system without decreasing the signal‐to‐noise ratio.

scholarly journals Electronic Detection of Serac Avalanches and Glacier Noise at Vaughan Lewis Icefall, Alaska

1972 ◽  
Vol 11 (62) ◽  
pp. 279-281 ◽  
Author(s):  
Alfred C. Pinchak
Keyword(s):  
Frequency Response ◽  
Recording System ◽  
Local Source ◽  
Light Weight ◽  
Electronic Detection ◽  
Seismic Recording ◽  
Glacier Ice ◽  
Response Field

Abstract Design details of a portable, light-weight, seismic recording system are presented together with data concerning sensitivity and frequency response. Field procedures and methods are described with emphasis on coupling the hydrophone detector to waves propagating in the glacier ice. Two of the field-recorded signals are reproduced here: the first resulted from a small serac avalanche in the ice fall and the second was produced by an unusual, local source of glacier noise.

Automated high-precision amplitude and phase calibration of seismic systems

1976 ◽  
Vol 66 (4) ◽  
pp. 1413-1424
Author(s):  
Eduard Berg ◽  
Duncan M. Chesley
Keyword(s):  
Background Noise ◽  
Center Of Mass ◽  
Onset Time ◽  
High Gain ◽  
Recording System ◽  
Correlation Technique ◽  
Long Period ◽  
Long Time ◽  
Phase Calibration ◽  
Period System

abstract Automated amplitude and phase response of the complete seismometer-recording system is obtained from step inputs to the calibration coil. High accuracy is achieved by summing as many pulses as desired (to eliminate background noise) by a correlation technique and subsequent Fourier analysis. The only parameters required are the seismometer mass, the Cal-coil constant (referred to the center of mass if appropriate) and current, and the precise onset time of one reference calibration current, which are all very stable over long time periods. Application to the High-Gain Long-Period system at KIP yields the magnification curve from only six pulses with less scatter (< ± 5 per cent for periods larger than 20 sec) than routine steady-state calibrations.

scholarly journals The Centipede seismic recording system

1977 ◽  
Author(s):  
Paul Reasenberg ◽  
Robert Cessaro ◽  
Dave Wilson
Keyword(s):  
Recording System ◽  
Seismic Recording
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