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Title: Post-processing of seismic parameter data based on valid seismic event determination

Abstract

An automated seismic processing system and method are disclosed, including an array of CMOS microprocessors for unattended battery-powered processing of a multi-station network. According to a characterizing feature of the invention, each channel of the network is independently operable to automatically detect, measure times and amplitudes, and compute and fit Fast Fourier transforms (FFT's) for both P- and S- waves on analog seismic data after it has been sampled at a given rate. The measured parameter data from each channel are then reviewed for event validity by a central controlling microprocessor and if determined by preset criteria to constitute a valid event, the parameter data are passed to an analysis computer for calculation of hypocenter location, running b-values, source parameters, event count, P- wave polarities, moment-tensor inversion, and Vp/Vs ratios. The in-field real-time analysis of data maximizes the efficiency of microearthquake surveys allowing flexibility in experimental procedures, with a minimum of traditional labor-intensive postprocessing. A unique consequence of the system is that none of the original data (i.e., the sensor analog output signals) are necessarily saved after computation, but rather, the numerical parameters generated by the automatic analysis are the sole output of the automated seismic processor.

Inventors:
 [1]
  1. (733 Alvarado Rd., Berkeley, CA 94705)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
865450
Patent Number(s):
4516206
Assignee:
McEvilly, Thomas V. (733 Alvarado Rd., Berkeley, CA 94705) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
post-processing; seismic; parameter; data; based; valid; event; determination; automated; processing; method; disclosed; including; array; cmos; microprocessors; unattended; battery-powered; multi-station; network; according; characterizing; feature; channel; independently; operable; automatically; detect; measure; times; amplitudes; compute; fit; fast; fourier; transforms; fft; p-; s-; waves; analog; sampled; rate; measured; reviewed; validity; central; controlling; microprocessor; determined; preset; criteria; constitute; passed; analysis; computer; calculation; hypocenter; location; running; b-values; source; parameters; count; wave; polarities; moment-tensor; inversion; vp; vs; ratios; in-field; real-time; maximizes; efficiency; microearthquake; surveys; allowing; flexibility; experimental; procedures; minimum; traditional; labor-intensive; postprocessing; unique; consequence; original; sensor; output; signals; necessarily; saved; computation; numerical; generated; automatic; sole; processor; seismic data; seismic event; parameter data; data base; independently operable; output signals; output signal; fourier transform; original data; fast fourier; analog output; fourier transforms; event count; measured parameter; automatically detect; data based; /702/367/

Citation Formats

McEvilly, Thomas V. Post-processing of seismic parameter data based on valid seismic event determination. United States: N. p., 1985. Web.
McEvilly, Thomas V. Post-processing of seismic parameter data based on valid seismic event determination. United States.
McEvilly, Thomas V. Tue . "Post-processing of seismic parameter data based on valid seismic event determination". United States. https://www.osti.gov/servlets/purl/865450.
@article{osti_865450,
title = {Post-processing of seismic parameter data based on valid seismic event determination},
author = {McEvilly, Thomas V.},
abstractNote = {An automated seismic processing system and method are disclosed, including an array of CMOS microprocessors for unattended battery-powered processing of a multi-station network. According to a characterizing feature of the invention, each channel of the network is independently operable to automatically detect, measure times and amplitudes, and compute and fit Fast Fourier transforms (FFT's) for both P- and S- waves on analog seismic data after it has been sampled at a given rate. The measured parameter data from each channel are then reviewed for event validity by a central controlling microprocessor and if determined by preset criteria to constitute a valid event, the parameter data are passed to an analysis computer for calculation of hypocenter location, running b-values, source parameters, event count, P- wave polarities, moment-tensor inversion, and Vp/Vs ratios. The in-field real-time analysis of data maximizes the efficiency of microearthquake surveys allowing flexibility in experimental procedures, with a minimum of traditional labor-intensive postprocessing. A unique consequence of the system is that none of the original data (i.e., the sensor analog output signals) are necessarily saved after computation, but rather, the numerical parameters generated by the automatic analysis are the sole output of the automated seismic processor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

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