Announcement of the 999th　DANWAKAI

(Danwakai: ERI Holds “Danwakai”, a monthly meeting where its members present
their most recent academic and technical achievements, once a month on Friday
of every month. Danwakai is open to the public.)

Date: Friday, 22 January 13:30-
Place: Web Meeting (Zoom)
*If you would like to join in DANWAKAI, please contact to Joint Usage section
(k-kyodoriyo@eri.u-tokyo.ac.jp). We will inform you URL and password in advance.

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1. 13:30-13:45
TITLE: Absolute Gravity Measurements at Teshikaga in 2019 and 2020
AUTHOR: *Yuichi IMANISHI and Ryuichi NISHIYAMA
SUMMARY: We report the results of absolute gravity measurements in 2019 and 2020
at Teshikaga Observatory, Hokkaido University, made for calibration of instrumental
drift of Superconducting Gravimeter iGrav #017. (accepted for publication in BERI)

2. 13:45-14:00
TITLE: Estimation of the bulk density of the Omuro scoria cone (Eastern Izu, Japan)
from gravity survey
AUTHOR: *Ryuichi NISHIYAMA･Seigo MIYAMOTO and Shogo NAGAHARA
SUMMARY: Gravity survey performed on the Omuro scoria cone (Izu peninsula).
The average density of the cone is determined and compared with that from
muography observation.

3. 14:00-14:15
TITLE: Quantitative measurement of bubble textures in pumice clasts using
a digital stereo microscope with low-angled ring illumination
AUTHOR: *Masatoshi OHASHI(Kyusyu University), Mie ICHIHARA･Fukashi MAENO,
Ben KENNEDY and Darren GRAVLEY(University of Canterbury)

4. 14:15-14:30
TITLE: Research for disaster manual in schools to avoid repeating the tragedy
of Okawa Elementary School
AUTHOR: *Tomoko GOTO

*Speaker