An algorithm of local earthquake detection from digital records

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The problem of automatical detection of earthquake signals in seismograms
and definition of first arrivals of p and s waves is considered.
The algorithm is based on the analysis of t(A) function which represents
the time of first appearence of a number of going one after another
swings of amplitudes greather than A in seismic signals. It allows to explore
such common features of seismograms of earthquakes as sudden
first p-arrivals of amplitude greater than general amplitude of noise and
after the definite interval of time before s-arrival the amplitude of which
overcomes the amplitude of p-arrival. The method was applied to
3-channel recods of Friuli aftershocks, ¿'-arrivals were defined correctly
in all cases; p-arrivals were defined in most cases using strict criteria of
detection. Any false signals were not detected. All p-arrivals were defined
using soft criteria of detection but less reliability and two false events
were obtained.

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How to Cite
CONSOLE, R., LITVIN, I. and PROZOROV, A. (1978) “An algorithm of local earthquake detection from digital records”, Annals of Geophysics, 31(1), pp. 209–223. doi: 10.4401/ag-4750.