Rates of diastrophic movement during the Quaternary in Indonesia

Abstract

Quaternary folding, faulting, tilting, uplift, and subsidence for several localities in Indonesia yield the following information with regard to rates of diastrophic movement. In the mobile regions the average rate of uplift with or without attendant folding amounts to 0.5 to 1.0 mm/yr. Subsidence occurs at rates of 2.0 mm/yr. As expected, diastrophic movements in the continental areas are much slower and are measured in hundredths of a millimeter annually. Wrench faulting possesses most rapid movements; rates of strike-slip movements are at least 5 mm/yr. It was also found that observation on deformational phenomena for. shorter periods yields anomalously high values of diastrophic rates. This evidence is in accordance with the spasmodic nature of diastrophism which is also reflected by the occurrence of multiple elevated terraces.