Journal of Volcanology and Geothermal Research, 49 (1992) 393-394 Elsevier Science Publishers B.V., Amsterdam Contents Volume 49, 1992 Research Papers Sulphur eruptions at Volcan Pods, Costa Rica C. Oppenheimer (UK) Fluid-volcano interaction in an active stratovolcano: the crater lake system of Pods volcano, Costa Rica G.L. Rowe Jr. and S.L. Brantley (University Park, Penn., USA), M. Fernandez and J.F. Fernandez (San Jose, Costa Rica), A. Borgia (Pasadena, Calif., USA) and J.Barquero (Heredia, Costa Rica) Volcanic hazard assessment of Guagua Pichincha (Ecuador) based on past behaviour and numerical models F. Barberi, M. Ghigliotti and G. Macedonio (Pisa, Italy), H. Orellana (Quito, Ecuador), M.T. Pareschi and M. Rosi (Pisa, Italy) Gravity study of Los Humeros caldera complex, Mexico: Structure and associated geothermal system J.O. Campos-Enriquez and J.J. Arredondo-Fragoso (Morelia, Mexico) The volcanic activity of La Soufriére of Guadeloupe (Lesser Antilles) : structural and tectonic implications J. Zlotnicki, G. Boudon and J.-L.L. Mouél (Paris, France ) Underground structure and magmatic activity of Izu-Oshima volcano,Japan as inferred from seismic reflection survey H. Suzuki and K. Kasahara (Ibaraki, Japan), M.Ohtake (Miyagi, Japan), A. Takahashi, T. Ikawa, S. Abe and Y. Kawabe (Tokyo, Japan ) Magma flow directions inferred from preferred orientations of phenocryst in a composite feeder dike, Miyake- Jima, Japan Y. Wada (Kobe, Japan) Volatile contents of obsidian clasts in tephra from the Taupo Volcanic Zone, New Zealand: Implications to eruptive processes N.W. Dunbar and P.R. Kyle (Socorro, N.M., USA) Isotope composition of rain water, well water and fumarole steam on the Island of Vulcano, and their implications for volcanic surveillance C. Capasso, G. Dongarra, R. Favara, S. Hauser and M. Valenza (Palermo, Italy) Rheology and microstructure of magmatic emulsions: theory and experiments D.J. Stein and F.J. Spera (Santa Barbara, Calif., USA) New measurements of SO, flux at Pods Volcano, Costa Rica R.J. Andres (Houghton, Mich., USA), J. Barquero (Heredia, Costa Rica) and W.I. Rose (Houghton, Mich., Across-arc variation of lava chemistry in the Izu-Bonin Arc: identification of subduction components Y. Tatsumi, M. Murasaki and S. Nohda (Kyoto, Japan) Dusty and honeycomb plagioclase: indicators of processes in the Uchino stratified magma chamber, Izu Peninsula, Japan T. Kawamoto (Kyoto, Japan ) Geochemistry of waters in the Valley of Ten Thousand Smokes region, Alaska T.E.C. Keith and J.M. Thompson (Menlo Park, Calif., USA), R.A. Hutchinson (Yellowstone N.P., Wyo., USA) and L.D. White (Menlo Park, Calif., USA) Mass transfer constraints on the chemical evolution of an active hydrothermal system, Valles caldera, New Mexico A.F. White (Menlo Park, Calif., USA), N.J. Chuma (Berkeley, Calif., USA) and F. Goff (Los Alamos, N.M., Fluorine and boron geochemistry of an ensialic marginal basin volcano: Deception Island, Bransfield Strait, Antarctica J.L. Smellie (Cambridge, UK), A. Hofstetter and G. Troll (Munich, Germany ) A geochemical model for fumaroles of the Mutnovsky volcano, Kamchatka, USSR Yu.A. Taran, V.P. Pilipenko, A.M. Rozhkov and E.A. Vakin (Petropavlovsk-Kamchatsky, USSR ) 0377-0273/92/$05.00 © 1992 Elsevier Science Publishers B.V. All rights reserved. 394 Nonequilibrium flow in volcanic conduits and application to the eruptions of Mt. St. Helens on May 18, 1980,and Vesuvius in AD 79 I a alc cite sl sess col das Senpebaianabenadunio wibesoiabenmmnanienntevesenseeied Chemical composition of natural deep and shallow hydrothermal fluids in the Larderello geothermal field V. Duchi and A. Minissale (Firenze, Italy) and M. Manganelli (Grosseto, Italy) ................ccccssssseecceeeeeessseeeeeeeeeeees 313 Geothermal assessment of the island of Ischia (southern Italy )f rom isotopic and chemical composition of the delivered fluids C. Panichi and L. Bolognesi (Pisa, Italy), M. R. Ghiara (Napoli, Italy), P. Noto and D. Stanzione (Napoli, I aa aa aa 0 i sal cera aed gaathnduinbnnsebubanentionnsbuapnrobenbadsansandabseetupsabéeensld A porous-flow model of flank eruptions on Mount Etna as ae EEE iss SE ©M II, SONNEF o ido csnsscsavssnsseccdssssvncasvscdndusecceescsovesesavecdasebbisscossdevonabaenebsasenansncssoscesouscecen Two examples of subaqueously welded ash-flow tuffs: the Visean of southern Vosges (France) and the Upper Cretaceous of northern Anatolia (Turkey) J.-L. Schneider (Strasbourg, France), C. Fourquin and J.-C. Paicheler (Reims, France) ...............::ccccsseesssseeeeeeees 365 Book Reviews Mafic Dykes and Emplacement Mechanisms, by A.J. Parker, P.C. Rickwood and D.H. Tucker (Editors) — S. Self.... 385 Mantle Convection, Plate Tectonics and Global Dynamics. The Fluid Mechanics of Astrophysics and Geophysics, Vol. 4, ne a OID 1 scl cpee deals bepnotinnsn abheciiansipiaenan seoinesacniiasebntonininaee ségaisiviesoucoarccbvosoconnnsils 387 Volcanic Hazards: Assessment and Monitoring, by J.H. Latter (Editor) — D. Dzurisin.................ccccccccesseesceeeesseeeeeeees 388 nares ar? nn, EIU UIE UE, CI Smtr MI sods ccnsasevsacsasocesscvnserevsenvansvascapssvcsceseodeonencouvsanancccsssasocerenssscosnadaah 390 EE EEE LIE ROG A ORR T OR OTE ITER OT S ET AORN OTE EOE TOTTI CRE EER OTT DEON SEE TSE ODT ETTI C? 392 392