Program of the workshop Presentation Day Start End Program Spekaer Title No. 4-Sep 17:00 Registration 18:00 Ice breaker and dinner 5-Sep 7:00 9:00 breakfast Welcome speech & 9:00 9:10 introduction by Nobuo Geshi Commissioner Welcome speech & 9:10 9:15 Mitsuhiro Nakagawa introduction by LOC Session 1 Magmatism of caldera volcano 9:15 9:45 1-01 keynote lecture Shan de Silva Classifying calderas: a review and discussion Preeruptive magma processes of the catastrophic eruption of high-silica rhyolite 9:45 10:15 1-02 keynote lecture Akihiko Tomiya from Toya caldera, Japan Break Stratigraphy and petrology of preceding eruptions of Shikotsu caldera-forming 10:30 10:35 1-03 short talk Mizuho Amma-Miyasaka eruption, Southwestern Hokkaido, Japan Evaluation of future large eruption from the dormant large stratovolcano: case 10:35 10:40 1-04 short talk Ryuta Furukawa study of Sundoro volcano, central Java, Indonesia Changes in the plumbing system during the caldera cycle at Rabaul, Papua New 10:40 10:45 1-05 short talk Gareth Fabbro Guinea Will the Tongariro Volcanic Centre evolve into a caldera-forming silicic volcanic 10:45 10:50 1-06 short talk Auer A system? 10:50 10:55 1-07 short talk Katsuya Kaneko Magma generation by crustal melting in Aso volcano and its physical consistency 10:55 11:00 1-08 short talk GAR Gualda Supereruptions: Snapshots of the crust in moments of high melt productivity Prolonged ascent and episodic venting of discrete magma batches at the onset of 11:00 11:05 1-09 short talk Myers, Madison L. the Huckleberry Ridge supereruption, Yellowstone Petrological study of the 7.3 ka Kikai caldera-forming eruption (K-Ah), southern 11:05 11:10 1-10 short talk Kyohei Kobayashi Kyushu, Japan: Existence of multiple silicic magmas and their interaction Geology and Petrology of Taisetu Volcanic Group, Japan; Evolution of magma and 11:10 11:15 1-11 short talk Kosuke Ishige activity ages. 11:15 11:20 1-12 short talk Shumpei Yoshimura CO2-rich advective fluid flow in caldera-forming magma chambers Poster core time (magma 11:20 12:30 system) 12:30 14:00 Lunch Break 14:30 15:00 2-01 keynote lecture Roberto Sulpizio Influence of stress changes on eruptive style Crustal instability and magma storage architecture during an intense ignimbrite 15:00 15:30 2-02 keynote lecture DAM Gravley flare-up, Taupo Volcanic Zone, New Zealand break 16:00 16:05 2-03 short talk Tadashi Yamasaki Viscoelastic relaxation in volcano deformation 16:05 16:10 2-04 short talk John Browning Forecasting magma chamber rupture at caldera volcanoes Geology and evolution of a resurgent dome at Kutcharo caldera, eastern Hokkaido, 16:10 16:15 2-05 short talk Yoshihiko Goto Japan 16:15 16:20 2-06 short talk Adnara Mucek Revealing Resurgence at Toba’s Supervolcano The Effect of Tectonic Stress on Eruption Triggering of Collapse Calderas: 16:20 16:25 2-07 short talk Haley E. Cabaniss Application to the Taupo Volcanic Zone, New Zealand 16:25 16:30 2-08 short talk Gerardo Aguirre-Díaz, J. The Ilopango caldera: A long-lived caldera system of Central America 16:30 16:35 2-09 short talk Tom Garden Ring fault architecture from hydrothermal perspective 16:35 16:40 2-10 short talk Nobuo Geshi Pressure evolution of collapsing magma chamber and ignimbrite eruption break 17:00 18:00 Poster core time 18:00 18:30 General discussion 1 18:30 20:00 Dinner 6-Sep 7:00 9:00 breakfast Session 2 Mechanism of caldera-forming eruption 9:00 9:30 3-01 keynote lecture Guido Giordano Calderas and their eruptions On the time interval between initial plinian and climactic pyroclastic flow phases 9:30 9:35 3-02 short talk Maeno Fukashi during a caldera-forming eruption at Kikai caldera, Japan 9:35 9:40 3-03 short talk Silvia Massaro Time evolution of magma feeding system during a Plinian eruption 9:40 9:45 3-04 short talk Masatoshi Ohashi Experiments with polyurethane foam toward simulating tube pumice Numerical simulations of a two-layer shallow-water model for pyroclastic flow by 9:45 9:50 3-05 short talk Hiroyuki Shimizu column collapse 9:50 9:55 3-06 short talk Takeshi Hasegawa Eruption sequence of BC 5,600 Mashu caldera-forming eruption Duration of the caldera-forming eruptions of Kikai volcano, Japan: preliminary 9:55 10:00 3-07 short talk Takeshi Hasegawa estimation from paleomagnetic directions and secular variation Reconstruction and evolution of intracaldera facies: the Rouyn-Pelletier Caldera 10:00 10:05 3-08 short talk L. Moore Complex, Abitibi greenstone belt, Canada Stratigraphy of pyroclastic deposits and debris avalanche deposit from 10:05 10:10 3-09 short talk Daisuke Sekine Kamafusayama Volcano, Fukushima prefecture, Japan The Ohachidaira caldera-forming eruption, Taisetsu volcano group, Hokkaido, 10:10 10:15 3-10 short talk Yuki Yasuda Japan Photogrammetric Study of the 1996 Eruption in Akademii Nauk Caldera, 10:15 10:20 3-11 short talk Alina.V. Shevchenko Kamchatka break Megavolcano in the Late Cenozoic Samtckhe-Javakheti Volcanic Province? 10:45 10:50 3-12 short talk Avtandil Okrostsavridze Lesser Caucasus, Georgia-Turkish Border 10:50 10:55 3-13 short talk Nino Popkhadze Upper Cretaceous Ignimbrites in the Bolnisi district, Lesser Caucasus, Georgia 10:55 11:00 3-14 short talk Shimpei Uesawa A finding of the source volcano of Kimobetsu pyroclastic flow deposits Geological study on caldera-forming eruption of Shikotsu volcano, south-western 11:00 11:05 3-15 short talk Chiharu Tomijima Hokkaido: Special reference to vent formation process Karymshina supercaldera as a result of the Eopleistocene catastrophic caldera- 11:05 11:10 3-16 short talk Aleksei Rogozin forming eruption in Southern Kamchatka, Russia Reconstruction of a giant pyroclastic flow associated with Karymshina 11:10 11:15 3-17 short talk Aleksei Rogozin supercaldera in Southern Kamchatka, Russia (data of 2012-2015 field work) 11:15 11:20 3-18 short talk Hiroaki Komuro Reverse grading in pyroclastic flow: 3D and 2D numerical models Revising the stratigraphy of pyroclastic deposits from Sand Sea caldera, Tengger- 11:20 11:25 3-19 short talk Kiyoshi Toshida Bromo volcano system, East Java, Indonesia Exposure of major highways to volcanic ash from future eruptions from Hakone 11:25 11:30 3-20 short talk Emma Singh and Fuji volcanoes, Japan: Implications for clean-up and evacuation Understanding the evolution and resulting hazard of a small-volume silicic fissure 11:30 11:35 3-21 short talk Kósik Szabolcs eruption: Puketerata volcanic complex, Taupo Volcanic Zone, New Zealand Poster core time 11:35 12:30 (eruption) 12:30 14:00 Lunch Break 14:00 15:00 General Discussion 2 15:00 15:30 break General meeting of 15:30 16:00 commission Session 3 Calderas in the southwestern Hokkaido Petrology and geochemistry of 40ka caldera-forming eruption of Shikotsu volcano, 4-01 Field tour introduction 1 Mitsuhiro Nakagawa Hokkaido, Japan: Structure and growth processes of large magma reservoir system by multiple silicic and mafic magmas at a caldera volcano Daisuke Miura , Shimpei Tephrochronology of silicic ignimbrites at Kuttara volcanic complex, SW Hokkaido, 4-02 Field tour introduction 2 Uesawa, Shingo Japan Takeuchi 18:30 20:00 Dinner DepartureReturen Field trip 1 Leaders: Mitsuhiro 7-Sep 8:30 18:00 Shikotsu Caldera Nakagawa Stop1-1: The pyroclastic sequence of the caldera-forming eruption of Shikotsu, Okuppu Stop1-2: Plinian fallout deposit and overlying ignimbrite of Shikotsu Caldera, Bibi Stop1-3: Post-caldera pumice falls from Shikotsu Caldera, Bibi Stop1-4: Various units of Shikotsu Ignimbrite, Rankoshi Stop1-5: Caldera view of Lake Shikotsu, Shikotsu Leaders: Daisuke Miura , Field trip 2 8-Sep 8:30 18:00 Shimpei Uesawa, Kuttara Caldera ShingoTakeuchi Stop 2-1: The successive sequence of Kuttara pyroclastic deposits at Mizuho, Shiraoi-cho Stop 2-2: Proximal facies of Kuttara pyroclastic deposits at Ayoro Coast 19:00 Dinner at Hotel Field trip 3 Leaders: Shimpei 9-Sep 8:30 17:00 Yotei volcano and Uesawa, Mitsuhiro surrounding calderas Nakagawa, Stop 3-1 Kimobetsu pyroclastic deposits at Kimobetsu Stop 3-2 Yotei tephra sequence at Kyogoku Stop 3-3 Lahar deposits in the Kutchan basin, Kutchan 19:00 Farewall Dinner 10-Sep 9:30 departure for the airport 11:00 Arrival at Sapporo New Chitose Airport.