Hydrothermal activity and long-term monitoring at Southern East Pacific Rise - Preliminary results of the Ridge Flux SEPR'97 Leg 2 cruise - Fujioka, K; Mitsuzawa, K; Kinoshita, M; Ishibashi, J; Joshima, M; Shitashima, K; Maruyama, A; Cowen, J P (JAMSTEC Journal of Deep Sea Research, 1999)