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Earth, Planets and Space

, Volume 56, Issue 8, pp 813–821

First Online: 24 June 2014Received: 22 December 2003Revised: 13 July 2004Accepted: 13 July 2004

Abstract

In the past decade, nine silent earthquakes were documented along the Nankai and the Sagami Troughs in Japan, which form the northwestern margin of the Philippine Sea plate. They occurred in the stable-unstable transition zone at depths of around 30 km on the subduction interface and were segregated from major asperities of the 1923 Kanto, the 1944 Tonankai and the 1946 Nankai earthquakes. Their equivalent magnitudes were less than 7 and overall slips were less than 0.2 m, one-order smaller than those of the major asperities of ordinary great earthquakes. Moment release rates of the silent earthquakes were less than 10 Nm-s, five-orders smaller than 10 Nm-s of the great earthquakes. Two methodologies are attempted to obtain order of magnitude estimates of the roughness and friction parameter of source areas of some of the silent earthquakes. One method compares observed waveforms to synthetics with an empirical source time function based on laboratory experiment. The other relates sizes of silent earthquakes to the friction parameter a-b.

Key wordsSilent earthquake fault roughness stable-unstable transition zone Nankai Trough Sagami Trough  Download to read the full article text



Autor: Ichiro Kawasaki

Fuente: https://link.springer.com/







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