Interseismic deformation at the Nankai Trough, Japan, subduction zone

Journal of Geophysical Research B: Solid Earth
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Abstract

Uplift along the coast of southwestern Japan following the 1944 Tonankai (Ms = 8.0) and 1946 Nankaido (Ms = 8.2) earthquakes has been inferred from the 1950–1985 tide gage records. Although uplift rates vary with geographic position, the temporal dependence at each site can be described as the superposition of an exponentially decaying (time constant ∼5 years) transient, significant only in the first decade postseismic, and a steady interseismic rate. The steady interseismic uplift rate is defined only over the 1956–1985 interval, but the linearity in time ofthat uplift record is such that uplift over the remainder of the interseismic cycle (∼80 years) might reasonably be expected to occur at the same rate. Moreover, the spatial pattern and magnitude of the steady uplift rate are reasonably close to those predicted by a simple dislocation model of subduction. However, the currently observed steady uplift rate is not consistent with the uplift rate inferred from geodetic leveling for the final half of the previous earthquake cycle. Thus, either the hypothesis of a steady interseismic uplift rate after the first decade postseismic is wrong or the strain accumulation pattern for one earthquake need not be the same as for the preceding earthquake on the same segment.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Interseismic deformation at the Nankai Trough, Japan, subduction zone
Series title Journal of Geophysical Research B: Solid Earth
DOI 10.1029/92JB00810
Volume 97
Issue B7
Year Published 1992
Language English
Publisher American Geophysical Union
Contributing office(s) Earthquake Science Center
Description 19 p.
First page 11117
Last page 11135
Country Japan
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