[H-CG22] Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Status, operations, and scientific application

Tue. May 27, 2025 10:45 AM - 12:15 PM 104 (International Conference Hall, Makuhari Messe)

convener:Dirk Metz(CTBTO), Satoru Endo(Graduate School of Advanced Science and Engineering,Hiroshima University), Hiroyuki Matsumoto(Japan Agency for Marine-Earth Science and Technology), Takayuki Otsu(Japan Weather Association), Chairperson:Satoru Endo(Graduate School of Advanced Science and Engineering,Hiroshima University), Yasuhito Igarashi(Institute for Integrated Radiation and Nuclear Science, Kyoto University)

The 1996 Comprehensive Nuclear-Test-Ban Treaty (CTBT) bans nuclear test explosions underground, in the ocean, and in the atmosphere. To ensure treaty compliance around the globe, the CTBT comprises a unique and comprehensive verification regime: The International Monitoring System (IMS). The IMS consists of 337 stations worldwide and uses four state-of-the-art monitoring technologies: 1. Seismic, 2. Hydroacoustic, 3. Infrasound, and 4. Radionuclide. As of now, more than 90-% of the facilities are operational, transmitting real-time data to the International Data Centre in Vienna, Austria.

In addition to detecting nuclear test explosions, the vast amount of data collected by the IMS has given rise to a range of civil and scientific applications, such as the study of earthquakes, volcanoes, tsunami events, climate change, the dispersion of radionuclide particles, and many other geophysical phenomena.

This session aims to bring together stakeholders from National Data Centers, station operators, and members of the research community, serving as a forum for discussion on all aspects of the IMS and test-ban treaty monitoring. Topics may include - but are not limited to - the status of the network in Japan and elsewhere, research outcomes from IMS data, and perspectives on future development of CTBT technologies, algorithms, and capacity building.

Presentations focusing on regional or global monitoring systems other than the IMS are welcome, especially when similar technologies are used (seismic, hydroacoustic, infrasound, and radionuclide). We also welcome research related to more accurate estimation of the deposition area of radioactive fallout in Hiroshima and Nagasaki in 1945.

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10:45 AM - 11:00 AM

[HCG22-07] Fundamental Study on the Estimation of the "Black Rain" Area Caused by the A-Bombing: Progress

*Yasuhito Igarashi¹, Hirohiko Ishikawa¹, Masayuki Takigawa², Akiyo Yatagai³, Satoru Endo⁴, Sumi Yokoyama⁵, Naoko FUKUDA⁵, Jun Inoue⁶, Yayoi Inomata⁷, TAKAMIYA Koichi¹, Hiroshi Yashima¹, Satoshi Fukutani¹, Maiko Ikegami¹, Tadashi Mukai¹, Tomonori Adachi¹, WG Meteorology and Soil (1.Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2.Japan Agency for Marine-Earth Science and Technology, 3.Graduate School of Science and Technology, Hirosaki University, 4.Graduate School of Advanced Science and Engineering, Hiroshima University, 5.Atomic Bomb Disease Institute, Nagasaki University, 6.Osaka Metropolitan University, 7.Institute of Nature and Environmental Technology, Kanazawa University)

11:00 AM - 11:15 AM

[HCG22-08] An investigation into the simulation of "black rain" in Hiroshima and Nagasaki using the numerical mesoscale weather prediction model WRF

*Yuichiro Oku¹ (1.University of Hyogo)

11:15 AM - 11:30 AM

[HCG22-09] Discovery and Analysis of Meteorological Recording Charts from the Time of the 1945 Hiroshima Atomic Bombing

*Akiyo Yatagai¹, Mio Maeda¹, Hirohiko Ishikawa² (1.Hirosaki University, 2.Institute for Integrated Radiation and Nuclear Science, Kyoto University)

11:30 AM - 11:45 AM

[HCG22-10] Inventory distribution of radionuclides in unaltered soil samples

*Hiroshi Yashima¹, Yasuhito Igarashi¹, Takashi Saito², Naofumi Akata³, Sumi Yokoyama⁴, Satoru Endo⁵, Yayoi Inomata⁶, Shinji Sugihara⁷, WG Meteorology and Soil (1.Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2.SHOKEI GAKUIN UNIVERSITY, 3.Hirosaki University, 4.Nagasaki University, 5.Hiroshima University, 6.Kanazawa University, 7.Oita University)

11:45 AM - 12:00 PM

[HCG22-11] Classification of molten particles collected in Hiroshima City based on FIB-TOF-SIMS analysis

*kei nagone¹, youske ishii², tetsuo sakamoto^1,2, satoru endo³, yasuhito igarashi⁴ (1.Electrical Engineering and Electronics Program, Graduate School of Engineering, Kogakuin University, 2.Department of Applied Physics, School of Advanced Engineering, Kogakuin University, 3.Graduate School of Advanced Science and Engineering, Hiroshima University, 4.Institute for Integrated Radiation and Nuclear Science, Kyoto University)

12:00 PM - 12:15 PM

[HCG22-12] Plaster wall was altered by the “Black rain” generated by the Hiroshima bombing.

*Tadashi Mukai^1,2, Tomonori Adachi^1,3, Naoki Toe¹, Yuji Shibahara¹, Maiko Ikegami¹, Hiroshi Yashima¹, Satoshi Fukutani¹, Koichi Takamiya¹, Jun Inoue², Yuichi Kurihara⁴, Yasuhito Igarashi¹ (1. Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2. Osaka Metropolitan University, 3.ATOX CO.,LTD. , 4. The University of Tokyo)

Session information