Abstract
There are many active and dormant volcanoes in central Kyushu, fumaroles and hot springs occurring in association with these volcanoes. Heat flow data show that high heat flow anomalies are confined to the eastern half of central Kyushu. In the Kuju area, partial melting may occur at a depth of 10–15 km. In the eastern half of central Kyushu temperatures calculated on the basis of convection of hot water are estimated to be 300 ° C at a depth of 5 km, and the difference between the crustal temperatures in the eastern and western parts was found to be very significant. Detailed studies of epicenter and hypocenter distribution in central Kyushu were made with special reference to the thermal state of the crust. Although the shallow seismic activity is generally high in central Kyushu, very few earthquakes with hypocenters deeper than 10 km are observed in the eastern part. The temporal change in shallow seismic activity in the eastern half of central Kyushu is explained by a hot crust in this region accompanied by the change in the tectonic stress field.
Published Version
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