Author's Organization：Inst. of Earth and Planetary Sciences,College of General Education,Osaka Univ., Inst. of Earth and Planetary Sciences,College of General Education,Osaka Univ.,
Published: November 15, 1991Received: February 18, 1991Available on J-STAGE: April 11, 2008Accepted: June 28, 1991
Advance online publication: -
Revised: -
