The 1031st DANWAKAI(program)

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.

Please refrain from secondary distribution of the URL to be provided. Due to copyright issues, recording of the video and audio distributed is strictly prohibited.

    Date:  Friday, December 22, 2023  13:30~(JST)

    Place: ERI Bldg.1, 2nd floor, Seminar Room1

        Livestream Zoom Webinar

* The zoom URL and password required for participation will be provided on the day of the event to those who wish to attend.

1. 13:30-13:45

TITLE: Report on the results obtained from electromagnetic and seismic array observation in the Southern Tohoku and the Northern Kanto area, Japan

AUTHOR: *Makoto UYESHIMA・Yoshiya USUI・Takao KOYAMA・Takashi IIDAKA・Shin’ichi SAKAI・Aitaro KATO, Masahiro ICHIKI (Tohoku University), Shin’ya SAKANAKA (Akita University), Yusuke YAMAYA (AIST)

 and Yasuo OGAWA (TITECH)

2. 13:45-14:00

TITLE: Observations of the Aftershock Sequences of Intermediate-depth Earthquakes Beneath Japan

AUTHOR: *Linda WARREN・Toshihiro IGARASHI and Aitaro KATO

SUMMARY: Most of the 207 intermediate-depth earthquakes with MJ≥5.7 that occurred beneath Japan from 1985-2021 were followed by observed aftershocks and 11% had enough aftershocks to characterize their temporal decay.  The characterized aftershock sequences have much lower productivity than shallow aftershock sequences, have a temporal decay exponent p≈1, and last from ~40 days to >30 years.

3. 14:00-14:15

TITLE: Multiphase turbulent flow explains lightning rings in volcanic plumes

AUTHOR: *ICHIHARA Mie. (ERI),Pablo D. MININNI (U. Buenos Aires), S.RAVICHANDRAN (IIT Bombay), Corrado CIMARELLI (LMU Munich) and Chris VAGASKY (Vaisala Inc.)