Results of study of anomalous ULF magnetic variations being observed prior to occurrence of strong geodynamic events

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Northern Caucasus geophysical laboratory for scientific studies of induced wave processes in the Elbrus
volcanic area includes five spaced geophysical laboratories. The following information-measuring systems are
in operation at the laboratories: broadband tri-axial seismometers, quartz tilt-meters, magnetic variometers,
geo-acoustic sensors, hi-precision distributed thermal sensors, gravimeters, and network-enabled data acquisi-
tion systems with precise GPS-timing and integrated monitoring of auxiliary parameters (variations on ambient
humidity, atmospheric pressure etc). Two laboratories are located in a deep tunnel drilled under the mount
Andyrchi. The obtained experimental data allows us to study the structure of geophysical wave fields induced
by earthquakes and regional catastrophic events. Anomalous wave forms in ULF geomagnetic variations pre-
ceding strong seismic events with magnitude 7 or more were experimentally determined; they may be related
to the development and interaction of dilatational structures. Different structure of ULF geomagnetic varia-
tions of «land» and «undersea» earthquakes were defined. Wave forms of ULF geomagnetic variations for the
earthquakes responsible for triggering tsunami events were obtained. Thus, in the future we will be able to
develop the technology of prediction of the area and the time of such class of catastrophic events provided that
additional forecast information (including acoustic, hydro-acoustic and geo-acoustic) is analyzed.