Recording of Infrasound Deformation Perturbations by Spatially Separated Laser Strainmeters

摘要

Packets of highly correlated oscillations with periods of 5 min 41.3 s and 6 min 49.6 s of unknown origin were distinguished in the synchronous records of laser strainmeters located in the Primorskii and Ural regions. At present, investigations based on the records of variations in the micro-displacements of the Earth's crust are carried out within the integrated project "Studies of the Deformation Processes in the Infrasound Range in the Primorskii and Ural regions" using two spatially separated laser strainmeters. One of the laser strainmeters is located underground at a depth of 3—5 m in the southern part of the Primorsky region at a point with coordinates 42°58'N, 131°16'E. It is oriented along the north—south line; the length of the operating beam is 52.5 m; the accuracy of micro-displacement is 0.1 nm [ 1-3]. A laser nano-barograph is located near the laser strainmeter for measuring the variations in the atmospheric pressure in the frequency range 0- 1000 Hz [4].