Evolution of the relief of the Mutnovskaya liver basin Southern Kamchatka)

Abstract

Erosion of an ancient volcanic caldera (Pacific coast of Southern Kamchatka) resulted from climatic changes and the World Ocean level fluctuations. 10 terraces and topographic levels correspond to time intervals favourable for terrace formation, their absolute ages are as follows (thousand years): floodplain, Q²₄ - 4 to 4,5, 1st terrace, Q¹₄- is to 7,5; II, Q³⁽¹⁾₃ - 25; III, Q₃³⁽²⁾ - 35; IV, Q₃³⁽¹⁾ - 45; V, Q₃¹⁽³⁾ - 75-80; VI, Q₃¹⁽²⁾ - 105; VII, Q₃¹⁽¹⁾ - 120-130; VIII level, Q₂²- 165-190; IX level, Q₂¹ - 200-400.