The 933rd DANWAKAI(program)

All members concerned

                                                     Earthquake Research Institute

                                                            The University of Tokyo


                                                                Takehiro  Koyaguchi


              Announcement of the 933rd DANWAKAI


(Danwakai: ERI Holds “Danwakai”, a monthly meeting where its members

present their most recent academic and technical achievements, on a

Friday of every month. Danwakai is open to the public.)


Date:Friday,26 December 13:30-

Place:ERI Bldg.2, 5th floor, Conference room1





Advances in earthquake and tsunami sciences and disaster risk reduction

since the 2004 Indian ocean tsunami

*Kenji Satake


On the tenth anniversary of the 2004 Sumatra-Andaman earthquake and

Indian Ocean tsunami, I will review the developments in seismology and

tsunami sciences, as well as their contribution to disaster risk reduction



Detection of viscoelastic relaxation due to the 2004 Sumatra earthquake

by a satellite gravity mission

*Yoshiyuki Tanaka, Takashi Hasegawa (Kyoto University), Hiroshi Tsuruoka,

Volker Klemann(GFZ Potsdam),Zdenek Martinec(Dublin Institute for

Advanced Studies)



Comparison of the slab morphology inferred from the seismic tomography

and numerical simulations

*Satoru Honda



Receiver function image of the subducting Philippine Sea plate around

the Kii Peninsula revealed by onshore and offshore seismic observations

*Takeshi AKUHARA, Kimihiro MOCHIZUKI


Water reverberation makes difficult the receiver function analysis

when applied to ocean bottom seismometer (OBS) data. We developed a

method to effectively remove the water reverberations, and applied

the method to the OBS data to reveal the geometry of the Philippine

Sea slab subducting beneath the Kii Peninsula along the Nankai Trough.

We, then, compared the seismicity distribution with the geometry.



Modeling study based on the results of receiver function analysis

at the 1891 Nobi earthquake area

*Takashi Iidaka, Akinori Hashima, Toshihiro Igarashi, Takaya Iwasaki,

Aitaro Kato, (Nagoya University), The Research Group for the Joint Seismic

Observations at the Nobi Area


The crustal structure was modeled at the 1891 Nobi earthquake area based

on the results of receiver function analysis using the data of joint

seismic observation



Source process analysis of the 2014 Northern Nagano earthquake using

strong-motion seismograms

*Hiroaki Kobayashi, Hiroe Miyake, Kazuki Koketsu



Imaging Crust and Upper Mantle beneath Mt. Fuji, Japan by Receiver Functions

*Sawako Kinoshita, Toshihiro Igarashi, Yosuke Aoki, Minoru Takeo



Volcanic fluid system and the 2014 activity of Aso Volcano

Satoshi KANESHIMA (Kyushu University), Takahiro OHKURA (Kyoto University),

Mare YAMAMOTO (Tohoku University), *Hitoshi KAWAKATSU



Volcanic plume measurements at Mt. Ontake using a multicopter drone

*Takeshi HASHIMOTO (Hokkaido University), Akihiko TERADA

(Tokyo Institute of Technology), Toshiya MORI (Graduate School of Science,

The University of Tokyo), Hiroshi SHINOHARA (National Institute of Advanced

Industrial Science and Technology),Mitsuhiro YOSHIMOTO (Mount Fuji Research

Institute, Yamanashi Prefectural Government) and Ryo TANAKA (Hokkaido University)


We report the first results of volcanic plume measurements at Mt. Ontake

performed with a multicopter drone.