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DTIC ADA526089: Research in Regional Seismic Monitoring
by Defense Technical Information Center
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During the last decades, a network of sensitive regional
arrays has been installed in northern Europe in
preparation for the global seismic monitoring network
under the Comprehensive Nuclear-Test-Ban treaty (CTBT).
This regional network, which comprises stations in
Fennoscandia, Spitsbergen and NW Russia provides a
detection capability for the European Arctic that is
close to mb = 2.5, using the Generalized Beamforming
(GBF) method for automatic phase association and initial
location estimates. We have continued our studies to use
data from the regional networks operated by the Kola
Regional Seismological Centre (KRSC) and NORSAR to assess
the seismicity and characteristics of regional phases of
the Barents/Kara Sea region, as well as the application
to seismic event screening. We have studied the
seismicity (i.e. seismic events apart from confirmed
nuclear explosions) of the Western Russia/Novaya Zemlya
region for the past 25 years, and found an average of
less than one seismic event per year exceeding mb 3.5.
Thus, the event occurrence in this region is so low that
no event of mb 3.5 and greater located in this region
should be screened out in the IDC screening process. The
same consideration could apply in some other regions of
the world, and the study of detailed seismicity patterns
is an important part of the further screening
developments. In discrimination studies, our results for
the European Arctic show that the P/S discriminant should
be applied with great caution in this region, and further
research is required. The regional MS:mb discriminant has
considerable promise, and the shorter-period energy
available in surface waves recorded at regional distances
can be exploited in improving the monitoring capabilities
during periods with strong interfering surface waves from
large distant earthquakes. We recommend that the current
efforts to improve mb determinations and to reconcile the
current mb values with the historic magnitude scale be
continued.
Date Published: 2018-07-28 01:42:44
Identifier: DTIC_ADA526089
Item Size: 10942961
Language: english
Media Type: texts
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DTIC Archive; ; NORWEGIAN SEISMIC ARR...
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