Dear CCVG colleagues,
On behalf of the Commission on the Chemistry of Volcanic Gases (CCVG) of the International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI), we are pleased to invite the international geochemical community working on volcanic gases to participate in the 15th CCVG workshop in Hokkaido, Japan, in early September 2025.
The main aims of the workshop are to share and discuss recent developments in observation techniques, results and interpretations. Three core activities of the workshop will be: (1) gas composition measurements using direct sampling and sensor techniques, (2) plume measurements using remote sensing techniques, and (3) soil degassing surveillance.
The workshop will include two days of scientific meetings followed by three days of field observations. The field observations will be made at Kuttara volcano, then at Usu volcano and/or Tarumae volcano .
Scientific Program
We hope the conference will be an opportunity to represent a wide range of scientific activities around the study of volcanic gases. As a guide, we aim to organize the presentations around the following topics: (1) geochemistry of magmatic gases and fluxes, (2) new observational techniques, (3) atmospheric chemistry of volcanic plumes, and (4) interpretation and modeling of volcanic processes with complementary datasets.
Field campaigns
1. Direct sampling of gas or hot springs (Kuttara, Tarumae, Usu)
2. Volcanic gas composition measurements using Multi-GAS or other sensor systems (Kuttara, Tarumae)
3. Plume measurements using UV remote sensing techniques such as DOAS (Tarumae)
4. Measurements of diffuse soil degassing especially CO2 (Usu)
Tentative Schedule
Starting Date: August 31, 2025
Day 1: Arrival at Sapporo & Ice Breaker party in Sapporo: Stay at Sapporo
Day 2: Scientific Meeting in Sapporo: Stay at Sapporo
Day 3: Scientific Meeting in Sapporo: Stay at Sapporo
Day 4:Field work at Kuttara volcano: Stay at Lake Toya
Day 5: Field work at Tarumae or Usu volcanoes: Stay at Lake Toya
Day 6: Field work at Tarumae or Usu volcanoes: Stay at Lake Toya
Day 7: Closing meeting and discussion, Fairwell Party: Stay at Lake Toya
Day 8: Morning: Transport to New Chitose Airport
Important dates (tentative)
October 2024 – Second Circular
February 2025 – Pre-registration / Abstract submission open
April 2025 – Abstract submission clsose
May 2025 – Registration close
Local organizing committee
Toshiya MORI (Univ. Tokyo)
Takeshi OHBA (Tokai Univ.)
Takeshi HASHIMOTO (Hokkaido, Univ.)
Ryo TANAKA (Hokkaido Univ.)
Ryo TAKAHASHI (HRO)
Muga YAGUCHI (MRI; JMA)
Ryunosuke KAZAHAYA (GSJ)
Hiroshi SHINOHARA (GSJ)
Masaaki MORITA (Univ. Tokyo)
Hirochika SUMINO (Univ. Tokyo)
Akihiko TERADA (Tokyo Inst. Tech.)
Jun-ichi HIRABAYASHI (V.G.R.A)
Urumu TSUNOGAI (Nagoya Univ.).
Contact: Ryunosuke KAZAHAYA (von.kazahaya@aist.go.jp)
CCVG Board
Co-Leader: Tobias Fischer – Univ. of New Mexico, USA
Co-Leader: Silvana Hidalgo – Escuela Politécnica Nacional、Ecuador
Secretary: Artur Ionescu – Universitatea Babeş-Bolyai, Romania
For further informations regading the workshop see the 1st circular.