Vertical Crustal Movements in the Kuril Islands from Geologic-Geomorphological and Tidal Data

Abstract

Yakushko, G.G. and Nikonov, A.A., 1983. Vertical crustal movements in the Kuril Islands from geologic-geomorphological and tidal data. In: P. Vyskočil (Editor), Recent Crustal Movements, 1982. Tectonophysics , 97: 103–111. Most of the tidal station areas investigated in the Kuril Islands have been rising for hundreds and thousands of years with average rates of 0.25–2.0 mm/yr as deduced from geologic-geomorphological data. However, some of the stations have shown, on the evidence of sea shore morphology and landscape, to experience relative sinking on the time scales of years or tens of years. Tidal observations recorded at 6 stations during 10–28 years indicate a sinking at some of the stations and an uplift at others. In some of the cases we have found out changes of sign and movement rate values over different time scales, correlating with near seismic events. Examples are given of residual vertical earthquake-generated displacements deduced from geologic-geomorphological and tidal data, including those produced by the Paramushir earthquake of 28 February, 1973.