Fluctuations of micro-deformations of the Earth crust caused by dangerous seismic events

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In the southern Primorsky Krai, Russia, not far away from the frontier with DPRK, a 52.5-m laser strain-
meter and a three-component broadband seismograph (sensor CMG3-ESPB, recorder GSR24) are operated in
the mode of continuous monitoring of micro-deformation variations in the Earth crust. These devices are a
part of a seismo-acustic-hydrophysical complex. The laser strainmeter is created on the basis of not equal-arm
Michelson interferometer with the working range of frequencies in within 0 - 1000 Hz. The working range of
frequencies of the broadband seismograph is from 0,01 to 10 Hz. The broadband seismograph is intended for
registration of powerful events, basically earthquakes. The laser strainmeter is intended for the registration
of microdisplacement level variations of the Earth crust at the level of background fluctuations of atoms, the
accuracy of microdisplacement measurement of the Earth crust is 0,1 nanometers. On the records of the laser
strainmeter and the broadband seismograph fluctuations corresponding to the earthquakes occurred in different
parts of the Earth were determined. During the processing of the records of the laser strainmeter and the
broadband seismograph, earthquakes of the Far East region of Russia and Japan were detected as well as a
nuclear test in Democratic People’s Republic of Korea on May 25, 2009 was registered.
Work is was partially support by the Russian Foundation of Basic Research grants (№ 09-05-00597-a, №
09-05-01089-a), FEB (1, 2 and 3 sections) and GC № 02.740.11.0341.