Experience of observing deformations of the earth's surface at small sites in rift zones in 1984–1995 in Kamchatka

A review is given of high-precision measurements of distances by light-rangefinders and elevations from Class I leveling between long-term geodetic centers at local deformation sites laid on the coast of Avacha Bay, in order to detect deformation precursors of a likely strong earthquake (M > 7.0) and to obtain quantitative characteristics of co-seismic deformations. The report in tabular form contains the results of all measurements performed in the period 1984 –1995. These data are necessary for future researchers, since between the preserved centers you can repeat the measurements with any exact methods, compare them with the results of previous years and draw more objective conclusions. During the observations at all sites, no significant changes (exceeding the double accuracy of their determination) exceeded and the distances between the geodetic centers did not occur. The strong (M = 6.8) earthquake that occurred on March 2, 1992, with its epicenter in Avacha Bay did not cause precursors of deformations, and co-seismic deformations did not occur either. Perhaps they were, however, the sensitivity of the method and the remoteness of the sites from the hypocenter of the earthquake did not allow them to be detected.