Post-processing of seismic parameter data based on valid seismic

Details Post-processing of seismic parameter data based on valid seismic Post-processing of seismic parameter data based on valid seismic

1982-10-21

1985-05-07

Smith, Jerry

Boots, shoes, and leggings

367 40, G01V 130

Patent

active

045162069

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.

REFERENCES:
patent: 3930145 (1975-12-01), Fort et al.
patent: 4314347 (1982-02-01), Stokely
patent: 4422165 (1983-12-01), Thomas et al.
McEvilly et al., "ASP: An Automated Seismic Processor for Microearthquake Networks" University of California, Sep. 23, 1981, Bulletin of the Seismological Society of America, vol. 72, No. 1, pp. 303-325, Feb. 1982.
Majer et al., "Monitoring an Underground Repository with Modern Seismological Methods" International Journal Rock Mechanics.
Mineral Science and Geomechanics, Abstract vol. 18, pp. 517-527, 1981.
McEvilly et al., "Automated Seismic Processor", Annual Report 1980, Earth Science Division, Lawrence Berkeley, Jul. 1981.

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