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

Patent · Tue Jan 01 00:00:00 EST 1985

OSTI ID:865450

McEvilly, Thomas V ^[1]

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1. 733 Alvarado Rd., Berkeley, CA 94705

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.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: McEvilly, Thomas V. (733 Alvarado Rd., Berkeley, CA 94705)
• Patent Number(s): US 4516206
• OSTI ID: 865450
• Country of Publication: United States
• Language: English

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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
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determined
preset
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constitute
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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/