水準測量により検出された地殻変動

概要

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Types of crustal movements found by precise relevelings were investigated from the view point of geotectonics. Slow secular movements as well as fast seismic ones have their own regional characteristics. In the tectonically stable regions as represented by Baltic Shield and Russian Platform, the most common recent vertical movement rates are of the order of the magnitude of 10^<-8>/year in tilt for the wavelength of 600-2,000 km. Recent results show that the leading role of the glacial-isostatic compasation probably transformed to tectonic processes proper in the region. On the other hand, in the Japanese orogenic zone, the best studied to date by geodetic means, rates of prominent crustal movements of both seismic and secular types are of the order of the magnitude of 10^<-7>-10^<-6>/year in tilt for the wavelength of less than 300 km. Close relationship between crustal movements and geostructures suggests that the long continued tectonic movements during the last 10^4-10^6 years are still continuing at the present.