The 1011th DANWAKAI(program)

(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 February 18  13:30-

Place:  Web Meeting (Zoom)

*URL and password will be provided by internal e-mail on February 18.


  1. 13:30-13:45

TITLE: Adaptive and automatic P- and S-phase pickers based on frequency spectrum variation of sliding time windows

AUTHOR: *Yijun ZHANG, Qiang CHEN and Xianwen LIU(Southwest Jiatong University)

SUMMARY: We here develop a new refining picker which adopts the frequency spectrum variation analysis (FSVA) to perform the adaptive phase onset identification for P and S-wave

2. 13:45-14:00

TITLE: Extension of Cellular Automata Research to Dynamic Fracture

AUTHOR: *Kota FUKUDA, Takahiro HATANO(Osaka University) and Kimihiro MOCHIZUKI

SUMMARY: We propose a cellular automaton model that can handle both rupture and seismic activity, and point out the importance of considering competing time constants.

3. 14:00-14:15

TITLE: TITLE: Analyses of seismo-acoustic data and satellite images extracting the January 2022 eruption sequence of a submarine volcano in Tonga


SUMMARY: The  eruption generated huge waves in the atmosphere, ocean, and solid earth. This study focuses on the volcanic activity in three days including the huge explosion.

4.  14:15-14:30

TITLE: Gravity changes associated with volcanic eruption in Tonga on January 15, 2022 recorded by superconducting gravimeter at Matsushiro