Current strain analysis for Obninsk observatory are presented. An extension rate of 5 x 10-9/y was recorded for the central part of European Russia using satellite geodesy. Preliminary results for a new laser extensometer installed in the Obninsk underground gallery (55.12°N, 36.59°E) are presented. The instrument with a 36 m base was an installed at depth of 30 m, along latitude and longitude. In this case, both seismic waves from earthquakes, tidal strain, and long-period signals associated with tectonic processes are recorded. Original strain data presented for July-September 2024 year period. Analysis of record noise is developed. Microseismic waves with periods from 10 to 50 s are presented. The long-period part with periods from 18 to 38 and 291 h connected with meteorological effects. Noise influence was excepted and for tidal analysis of difference strain a 70-day record are used. The Shida tidal parameter is studied. As a result of the study, it is shown that old results by measurements with gravimeters, tube-extensometers, and tiltmeters are related to old elastic tidal models. Our new results show accordance with DDW99 Earth tidal model with viscosity-elastic mantle.
