This research was conducted under contract with Aomori Prefectural Government, Japan. We thank Drs. K. Kitayama, K. Furuya, Y. Suzuki, Y. Kawasaki, T. Hirano, and K. Takagi for their advice and Drs. K. Nitta, M. Endo, and K. Koyama for their support. We also thank K. Nishidate, K. Kaga, T. Urasunai, S. Tanaka, Y. Hachinohe, M. Numasawa, H. Iwasaki, N. Ookubo, K. Orikasa, K. Sasaki, N. Kawabata, M. Edo, Y. Hunahasi, Y. Saito, and H. Iseya for their technical assistance.
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