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Earth, Planets and Space

, Volume 62, Issue 9, pp 685–691

First Online: 13 December 2010Received: 05 April 2010Revised: 15 August 2010Accepted: 18 August 2010

Abstract

We found a recurring seismic velocity decrease associated with small earthquake swarms experienced in 2007 in a geothermal area in Kyushu, southwestern Japan, by analyzing long-term changes in the autocorrelation function ACF of seismic noise. The seismic velocity decrease appeared just after two major periods of earthquake activity began in June and October of 2007. In both instances, conditions returned to normal within a characteristic time period of 4 months. The observed size of the velocity changes agrees well with the magnitudes of the swarms. The lag-time dependence of ACF changes can be systematically explained by seismic velocity changes induced by fluid inclusion in a small, localized area deep within the hypocenter region.

Key wordsEarthquake swarm temporal change seismic interferometry  Download fulltext PDF



Autor: Takuto Maeda - Kazushige Ohara - Yohei Yukutake

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



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