540 



ACKNOWLEDGMENTS 



The author expresses many thanks to Messrs. M. 

 Tokuda, K. Okuda, and Dr. S. Kawai of his laboratory 

 for continuous cooperation and discussion, and to 

 Professor H. Kunishi of Kyoto University, Professor 

 K. Kajiura of University of Tokyo, Professor H. 

 Mitsuyasu of Kyushu University, and Dr. N. Iwata of 

 National Research Center for Disaster Prevention 

 for valuable discussion and comments. He also 

 thanks Mrs. F. Ishii for her continuous assistance. 



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