| Abstract |
The Kuju-iwoyama area shows the most intense solfataric activity in central Kyushu,Japan. In the area, we measured heat and water discharges by fumaroles, steaming grounds, hot springs and therral conduction. The total heat and water disrliarges amount to 9Y.2 MU and 235 T/H, respectively. Such a large discharge 'rate and high fumarol ic temperatures amounting to 5002: suggest the upward transfer of magmatic steam flow. Anomalously high seismic noise level was observed at the solfataric area. The amplitudes. of the seismic noise have a close correlation w i th the surface lieat discharge rates. Such a fact suggests ttrat the origin of the seismic noise i s the motion of the steam and/or phase clrange of, water under the near-surface. A temporary seismographic network ras installed around active solfataric arr:a.Aa a result; very active seismic activity has been clarified in and around tlie solfataric area. Based on the detailed hypocenter distribution. we can discuss the heat transfer process below such an active solfataric area. |