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A multi-channel processing approach to real time network detection, phase association, and threshold monitoring
Bulletin of the Seismological Society of America, 79 (6): 1927--1940 (01.12.1989)
Аннотация
This paper presents an approach to multi-channel processing of data
recorded by a network of stations which represents an extension of
the delay-and-sum beamforming traditionally applied in array processing.
A number of geographical beam-steering points are defined, and for
each beam a set of time-aligned traces derived from the network stations
are processed together so as to extract, for each step in time, a
set of features corresponding to that particular beam. Applying this
approach to the network of the three regional arrays, NORESS, ARCESS,
and FINESA, in Fennoscandia, we demonstrate its usefulness for associating
regional phases detected at individual arrays and originating from
the same event. We also address the problem of using a network to
continously monitor the seismic noise field. The purpose here is
to determine to what extent interfering events affect the monitoring
of events within a target region. In this regard, we show that one
can obtain, at a given confidence level, a continuous assessment
of the upper limit of magnitudes of seismic events in the target
region that would go undetected by such a network.
