Contents volume 63, 1994

I¢)umal of volcanoloD' and geothermal research ELSEVIER

Journal of Volcanology and Geothermal Research 63 ( 1994 ) 281

Contents Volume 63, 1994 Editor's Note - A.R. McBirney ................................................................................................................................................... i Research Papers

Permanent lava lakes: observed facts and induced mechanisms H. Tazieff ............................................................................................................................................................................... Size, distribution, and magma output rate for shield volcanoes of the Michoac~in-Guanajuato volcanic field, Central Mexico T. Hasenaka ............................................................................................................................................................................1 An Early Cretaceous volcanic arc/marginal basin transition zone, Peninsula Hardy, southernmost Chile C.A. Miller, M. Barton, R.E. Hanson and T.H. Fleming ....................................................................................................... 3 Neogene ignimbrites of the Nevsehir plateau (central Turkey ): stratigraphy, distribution and source constraints J.-L. Le Pennec, J.-L. Bourdier, J.-L. Froger, A. Temel, G. Camus and A. Gourgaud .......................................................... 5~ Folds produced by gravity spreading of a banded rhyolite lava flow J.V. Smith and E.C. Houston .................................................................................................................................................8~ Pressure and volume changes in magmatic systems due to the vertical displacement of compressible materials N. Bagdassarov .......................................................................................................................................................................95 Discussion

"Fossil gas explosions?" by R.D. Schuiling and R.J. Bakker C o m m e n t s - P. Boivin and A. Gourgaud ..............................................................................................................................101 Reply - R.D. Schuiling, R.J. Bakker, R.A.J. Smallegange and S. Welle Donker ................................................................... 107 Research Papers

B-type and explosion earthquakes observed at Asama volcano, central Japan M. Sawada .............................................................................................................................................................................. 11 I Determination of reservoir properties at Wairakei Geothermal Field using gravity change measurements T.M. Hunt and W.M. Kissling ............................................................................................................................................... 12 ~? Testing global synchronism in peri-Pacific arc volcanism H. Cambray and J.P. Cadet .................................................................................................................................................... 145 Polygenetic Quaternary volcanism at Crater Flat, Nevada T.K. Bradshaw and E.I. Smith ............................................................................................................................................... 165 Cerro Xalapaxco: an unusual tuff cone with multiple explosion craters, in central Mexico (Puebla) M.J. Abrams and C. Siebe ...................................................................................................................................................... 183 Long-lived magmatic phases at Los Azufres volcanic center, Mexico E. Pradal and C. Robin .......................................................................................................................................................... 20 I A large volcanic debris avalanche in the Pliocene Roque Nublo Stratovolcano, Gran Canaria, Canary Islands L. Garcia Cacho, J.L. Diez-Gil and V. Arafia ........................................................................................................................217 Fluorine and chlorine contents in the lavas and ejecta of the 1986 eruption of Izu-Oshima volcano M. Yoshida, K. Uchikawa and J. Hirabayashi ........................................................................................................................23 I Evaluation of sulfur dioxide emissions from explosive volcanism: the 1982-1983 eruptions of Galunggung, Java, Indonesia G.J.S. Bluth, T.J. Casadevall, C.C. Schnetzler, S.D. Doiron, L.S. Walter, A.J. Krueger and M. Badruddin ........................ 243 Calculated effect of vesicles on the thermal properties of cooling basaltic lava flows L. Kcszthelyi........................................................................................................................................................................... 257 Interactions between bubbles in magmas and lavas: effects of bubble deformation M. Manga and H.A. Stone ...................................................................................................................................................... 267