An algorithm of local earthquake detection from digital records

Main Article Content

R. CONSOLE
I. LITVIN
A. PROZOROV

Abstract

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
1.
CONSOLE R, LITVIN I, PROZOROV A. An algorithm of local earthquake detection from digital records. Ann. Geophys. [Internet]. 1978Nov.25 [cited 2021Jun.24];31(1):209-23. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4750
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