Curriculum Vitae: Osamu Sandanbata (Last update: July 27, 2024)

Curriculum Vitae

Osamu SANDANBATA (Name in passport: Osamu SANDAMBATA)
Assistant Professor
Earthquake Research Institute, The University of Tokyo
1-1-1, Yayoi, Bunkyo, Tokyo, 113-0032, Japan.
Citizenship: Japan
Email: osm3@eri.u-tokyo.ac.jp
Phone: +81-3-5841-5720
ORCID: 0000-0002-2361-8482
Google Scholar: https://scholar.google.co.jp/citations?user=jOInzmgAAAAJ&hl=en&oi=ao
Homepage: https://osm3dan.github.io/

Research Interest•

Dynamics of volcanic calderas interacting intra-caldera fault systems and a magma reservoir•

Numerical modeling and analysis of tsunami and seismic waves•

Mechanical modeling of volcanic phenomena

Positions2023.05 – Present

Assistant Professor, Earthquake Research Institute, The University of Tokyo

2023.04 – 2023.04

Postdoctoral Researcher, Earthquake Research Institute, The University ofTokyo2020.04 – 2023.03

Research Fellow of Japan Society for the Promotion of Science (PD),Earthquake and Tsunami Research Division, National Research Institute for
Earth Science and Disaster Resilience2017.04 – 2020.03

Research Fellow of Japan Society for the Promotion of Science (DC1)

Education2017.04 – 2020.03

Ph.D., Earthquake Research Institute, Department of Earth and Planetary
Science, The University of Tokyo

2015.04 – 2017.03

M.S., Earthquake Research Institute, Department of Earth and Planetary
Science, The University of Tokyo1

Curriculum Vitae: Osamu Sandanbata (Last update: July 27, 2024)

2011.04 – 2015.03

B.S., Department of Earth and Planetary Science, The University of Tokyo

Visiting
2023.12 – 2023.12

Visiting Researcher at Seismological Laboratory, California Institute ofTechnology

2022.04 – 2022.07

Visiting Scholar at Geophysics Department, Stanford University

2019.07 – 2019.09

Visiting Researcher at Seismological Laboratory, California Institute ofTechnology

Publications
Submitted paper (not peer-reviewed)
1. Takemura, S., Kubota, T., and Sandanbata O., Successive tsunamigenic events near the Sofu Seamountinferred from high-frequency teleseismic P and regional T waves (submitted). Preprint:
https://doi.org/10.22541/essoar.172107980.08343842/v1
2. Sandanbata, O. and Saito, T., Segmented trapdoor fault in Kita-Ioto Caldera, Japan: Insights from millimeter tsunami waves captured by an array network of ocean bottom pressure gauges (submitted). Preprint:
https://doi.org/10.22541/essoar.172072454.49207214/v1
Published Articles
1. Sandanbata, O., Satake, K., Takemura, S., Watada, S., Maeda, T., & Kubota, T. (2024). Enigmatic tsunami
waves amplified by repetitive source events near Sofugan volcano, Japan. Geophysical Research Letters,
51, e2023GL106949. https://doi.org/10.1029/2023GL106949
2. Sandanbata, O., & Saito, T. (2024). Quantifying magma overpressure beneath a submarine caldera: A
mechanical modeling approach to tsunamigenic trapdoor faulting near Kita-Ioto Island, Japan. Journal ofGeophysical Research: Solid Earth, 129, e2023JB027917. https://doi.org/10.1029/2023JB027917
3. Sandanbata, O., Watada, S., Satake, K., Kanamori, H., & Rivera, L. (2023). Two volcanic tsunami events
caused by trapdoor faulting at a submerged caldera near Curtis and Cheeseman Islands in the Kermadec
Arc. Geophysical Research Letters, 50, e2022GL101086. https://doi.org/10.1029/2022GL101086
4. Sandanbata, O., Watada, S., Satake, K., Kanamori, H., Rivera, L., and Zhan, Z. (2022). Sub-decadal
volcanic tsunamis due to submarine trapdoor faulting at Sumisu caldera in the Izu–Bonin Arc. Journal ofGeophysical Research: Solid Earth, 127, e2022JB024213. https://doi.org/10.1029/2022JB024213
5. Kubo, H., Kubota, T., Suzuki, W., Aoi, S., Sandanbata, O., Chikasada, N., and Ueda, H. (2022). Oceanwave phenomenon around Japan due to the 2022 Tonga eruption observed by the wide and dense oceanbottom pressure gauge networks. Earth Planets Space 74, 104. https://doi.org/10.1186/s40623-02201663-w
6. Kubota, T., Saito, A., T., Chikasada, N. Y., and Sandanbata, O. (2021). Meteotsunami observed by the
deep-ocean seafloor pressure gauge network off northeastern Japan, Geophysical Research Letters, 48(21)2Curriculum Vitae: Osamu Sandanbata (Last update: July 27, 2024)

e2021GL094255. https://doi.org/10.1029/2021GL094255
7. Lai, V. H., Zhan, Z., Brissaud, Q., Sandanbata, O., and Miller, M. S. (2021). Inflation and Asymmetric
Collapse at Kilauea Summit during the 2018 Eruption from Seismic and Infrasound Analyses, Journal ofGeophysical Research: Solid Earth, 126(10), e2021JB022139. https://doi.org/10.1029/2021JB022139
8. Sandanbata, O., Kanamori, H., Rivera, L., Zhan, Z., Watada, S., and Satake, K. (2021). Moment tensorsof ring-faulting at active volcanoes: Insights into vertical-CLVD earthquakes at the Sierra Negra caldera,
Galápagos Islands, Journal of Geophysical Research: Solid Earth, 126(6), e2021JB021693.
https://doi.org/10.1029/2021JB021693
9. Sandanbata, O., Watada, S., Ho, T-C., and Satake, K. (2021). Phase delay of short-period tsunamis in thedensity-stratified compressible ocean over the elastic Earth, Geophysical Journal International, 226(3),1975–1985. https://doi.org/10.1093/gji/ggab192
10. Saito, A., T., Kubota, T., Chikasada, N. Y., Tanaka, Y., and Sandanbata, O. (2021). Meteorologicaltsunami generation due to sea-surface pressure change: Three-dimensional theory and synthetics of oceanbottom pressure change, Journal of Geophysical Research: Oceans, 126(5), e2020JC017011.
https://doi.org/10.1029/2020JC017011
11. Heidarzadeh, M., Ishibe, T., Sandanbata O., Muhari, A., and Wijanarto, A. B. (2020). Numericalmodeling of the subaerial landslide source of the 22 December 2018 Anak Krakatoa volcanic tsunami,Indonesia, Ocean Engineering, 195, 106733. https://doi.org/10.1016/j.oceaneng.2019.106733
12. Wang, Y., Satake, K., Sandanbata, O., Maeda, T., and Su, H. (2019). Tsunami data assimilation of cabled
ocean bottom pressure records for the 2015 torishima volcanic tsunami earthquake, Journal ofGeophysical Research: Solid Earth, 124(10), 10413-10422. https://doi.org/10.1029/2019JB018056
13. Sandanbata, O., Shiobara, H., Kusumoto, S., Kim, H. J., Oba, A., Liu, Q., Ueda, T., Ogawa, M., Takano,K., Kotobuki, I., and Wang, Y. (2018). Equipment of Miniature Instruments to Measure Tsunami Waves
in an Experimental Tank (in Japanese), Technical Research Report, Earthquake Research Institute, theUniversity of Tokyo, 24, 29-34. http://www.eri.u-tokyo.ac.jp/GIHOU/archive/24_029-034.pdf
14. Sandanbata, O., Watada, S., Satake, K., Fukao, Y., Sugioka, H., Ito, A., and Shiobara, H. (2018). Ray
Tracing for Dispersive Tsunamis and Source Amplitude Estimation Based on Green’s Law: Application to
the 2015 Volcanic Tsunami Earthquake Near Torishima, South of Japan, Pure and Applied Geophysics,
175, 1371–1385. https://doi.org/10.1007/s00024-017-1746-0
15. Fukao, Y., Sandanbata, O., Sugioka, H., Ito, A., Shiobara, H., Watada, S., and Satake, K. (2018).
"Mechanism of the 2015 volcanic tsunami earthquake near Torishima, Japan." Science advances 4, no. 4,
eaao0219. https://doi.org/10.1126/sciadv.aao0219
16. Sandanbata, O., Obara, K., Maeda, T., Takagi, R., and Satake, K. (2015). Sudden changes in theamplitude-frequency distribution of long-period tremors at Aso volcano, southwest Japan, GeophysicalResearch Letters, 42, 10,256–10,262. https://doi.org/10.1002/2015GL066443

Honors and Awards
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Curriculum Vitae: Osamu Sandanbata (Last update: July 27, 2024)

1. The University of Tokyo Excellent Young Researcher, The University of Tokyo, 2023.
2. Early-Career Researcher Plenary Speaker, IAVCEI 2023 Scientific Assembly, 2023.
3. Student Presentation Award, Seismological Society of Japan Fall Meeting 2018, 2018.
4. Outstanding Student Presentation Award, JpGU Annual Meeting 2018, 2018.
5. Outstanding Student Presentation Award, JpGU-AGU Joint Meeting 2017, 2017.
6. Best Student Poster Award, Asia Oceania Geoscience Society 13th Annual Meeting, 2016.
7. Outstanding Student Presentation Award, JpGU Annual Meeting 2016, 2016.

International Conference
1. Sandanbata, O., & Saito, T. (2023). Detecting Small Volcanic Tsunami Signals from Kita-Ioto Caldera
Using Dense DONET Ocean-Bottom Pressure Records, AGU 2022 Fall Meeting, V11E-09, San
Francisco/Online, US, December 2023.
2. Sandanbata, O. (2023). Trapdoor faulting at submarine calderas in Japan and New Zealand: Its potential
for volcanic tsunami generation (accepted), IAVCEI 2023 Scientific Assembly, Early-Career Researcher
Plenary Session (selected), Rotorua, New Zealand, January–February 2023.
3. Sandanbata, O., Watada, S., Satake, K., Kanamori, H., Rivera, L., and Zhan, Z. (2023). Sub-decadal
volcanic tsunamis due to submarine trapdoor faulting at Sumisu caldera in the Izu-Bonin arc (accepted),
IAVCEI 2023 Scientific Assembly, 401, Rotorua, New Zealand, January–February 2023.
4. Sandanbata, O., & T. Saito. Trapdoor faulting at Kita-Ioto Caldera, Japan: Quantification of magma
overpressure beneath a submarine caldera, AGU 2022 Fall Meeting, V11B-01, Chicago/Online, US,
December 2022.
5. Sandanbata, O., Kanamori, H., Rivera, L., Zhan, Z., Watada, S., Satake, K., and Lai, V. H. (2021).
Teleseismic moment tensor inversion for ring-faulting at active calderas: Case studies at Sierra Negra in
the Galápagos Islands and Kilauea in Hawaii, AGU 2021 Fall Meeting, V25D-0155, Online, December
2021.
6. Sandanbata, O., Watada, S., Satake, K., Kanamori, H., Rivera, L., and Zhan, Z. (2020). Unexpectedly
large tsunamis generated by submarine volcanic earthquakes: Evidence of trapdoor faulting at a submarine
caldera, AGU 2020 Fall Meeting, V043-04, Online, December 2020.
7. Lai, V. H., Sandanbata, O., Zhan, Z., and Miller, M. S. (2020). Seismic characterization of explosive andcollapse events at the Kilauea summit during the 2018 eruption, AGU 2020 Fall Meeting, V002-0012,
Online, December 2020.
8. Sandanbata, O., Watada, S., Satake, K., Kanamori, H., Rivera, L., and Zhan, Z. (2020). Volcanic tsunami
earthquakes repeating at submarine calderas (1): Physical mechanism, JpGU-AGU Joint Meeting 2020,
SVC45-36, Online, July 2020.
9. Sandanbata, O., Watada, S., Satake, K., Kanamori, H., Rivera, L., and Zhan, Z. (2020). Volcanic tsunami
earthquakes repeating at submarine calderas (2): Kinematic source modeling of the 2015 Torishima
earthquake, JpGU-AGU Joint Meeting 2020, HDS08-P07, Online, July 2020.
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Curriculum Vitae: Osamu Sandanbata (Last update: July 27, 2024)

10. Wang, Y., Sandanbata, O., Satake, K., Maeda, T., and Su, H. (2019). Tsunami Data Assimilation of the2015 Torishima Earthquake, AGU 2019 Fall Meeting, NH43F-0995, San Francisco, U.S., December 2019.
11. Sandanbata, O., Watada, S., and Satake, K. (2018). Abrupt large uplift caused by volcanic tsunami
earthquakes near the Kermadec Islands, AGU 2018 Fall Meeting, NH33A-06, Washington, D.C, U.S.,
December 2018.
12. Sandanbata, O., Watada, S., Satake, K., Fukao, Y., Sugioka, H., Ito, A., and Shiobara, H. (2018). Tsunami
Source Modeling for the 2015 Volcanic Tsunami Earthquake Near Torishima, South of Japan, AOGS 2018
Annual Meeting, IG03-D3-PM1-323A-015, Honolulu, U.S., June 2018.
13. Sandanbata, O., Watada, S., Satake, K., Fukao, Y., Sugioka, H., Ito, A., and Shiobara, H. (2017). Tsunami
Source Modeling of the 2015 Volcanic Tsunami Earthquake near Torishima, South of Japan, AGU 2017
Fall Meeting, NH23A-0231, New Orleans, U.S., December 2017.
14. Sandanbata, O., Watada, S., Satake, K., Fukao, Y., Sugioka, H., Ito, A., and Shiobara, H. (2017). Ray
tracing for dispersive tsunamis and estimation of initial sea-surface displacement: Application to the 2015
Smith Caldera earthquake, JpGU-AGU Joint Meeting 2017, HDS16-12, Chiba, Japan, May 2017.
15. Sandanbata, O., Watada, S., Satake, K., Fukao, Y., Sugioka, H., Ito, A., and Shiobara, H. (2016). 2015
volcanic tsunami earthquake near Torishima Island: Ray tracing analysis of dispersive tsunami wave, AGU
2016 Fall Meeting, NH43B-1838, San Francisco, U.S., December 2016.
16. Sandanbata, O., Watada, S., Satake, K., Fukao, Y., Sugioka, H., Ito, A., and Shiobara, H. (2016). 2015
Torishima Tsunami Earthquake: Ray Tracing Analysis Of Dispersive Tsunami Wave, AOGS 2016 Annual
Meeting, OS22-SE37-D4-PM2-P-008, Beijing, China, August 2016.
17. Sandanbata, O., Obara, K., Maeda, T., Takagi, R., and Satake, K. (2015). Step-wise temporal change inthe frequency-amplitude distribution of volcanic long period tremors at Aso volcano, Workshop ERI-IPGP,
Paris, France, September 2015.

Invited Talk
1. Sandanbata, O., Exploring unknown submarine volcanic activity using tsunami and seismic wave
records (in Japanese), Seismology Special Seminar, Hirosaki University, Japan. November 2023.
2. Sandanbata, O., Unusual volcanic tsunamis caused by trapdoor faulting at submarine calderas,
Brown Bag Seminar of Seismological Laboratory, California Institute of Technology, US. April 2022.
3. Sandanbata, O., Unusual volcanic tsunamis caused by trapdoor faulting at submarine calderas,
Bullard Laboratories Seminar, the University of Cambridge, UK. March 2022.
4. Sandanbata, O., Investigations of ring-faulting at active calderas: Case studies at Sierra Negra
caldera in Galápagos, and Smith caldera in Japan, Volcano Group Meeting, University of Leeds, UK.
April 2021.
5. Sandanbata, O., Abnormal tsunamis caused by trapdoor faulting repeating at submarine volcanic
calderas, Geophysics Seminar, Stanford University, US. April 2021.

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Curriculum Vitae: Osamu Sandanbata (Last update: July 27, 2024)

Fellowships and Grants
Fellowship
1. Japan Society for the Promotion of Science (JSPS) Research fellow (PD), 2020.04 – Present.
2. Japan Society for the Promotion of Science (JSPS) Research fellow (DC1), 2017.04 – 2020.03.
Grants1. Grant-in-Aid for Early-Career Scientists, #24K17141 (2024.04.01–2028.03.31: JPY4,810,000)
2. The Sasakawa Scientific Research Grant, The Japan Science Society, #2023–2031 (2023.04.01–
2024.02.10: JPY1,500,000)
3. Grant-in-Aid for JSPS Fellows, #20J01689 (2020.04.01–2023.03.31: JPY4,810,000)
4. Grant-in-Aid for JSPS Fellows, #17J02919 (2017.04.01–2020.03.31: JPY4,160,000)

Thesis Titles
Ph.D.

Physical mechanism of volcanic tsunami earthquakes repeating at submarine volcanoes.
(Supervisor: Prof. Kenji Satake)

M.S.

Ray Tracing for Dispersive Tsunamis and Estimation of Initial Sea-surface Deformation from
Array Data: Application to the 2015 Volcanic Tsunami Earthquake near Smith Caldera, Southof Japan. (Supervisor: Prof. Kenji Satake)

B.S.

Step-wise changes in the amplitude-frequency distribution of long-period tremors at Aso
volcano (in Japanese). (Supervisor: Prof. Kazushige Obara)

Teaching Experiences
2023.09 – 2023.09

Summer School of Earthquake Research Institute, The University of Tokyo.

2023.04 – 2023.06

Senior Research Project in Earth and Planetary Physics, The University of Tokyo.

2017.06 – 2017.07

Tutor for two international internship students of University of Tokyo ResearchInternship Program, The University of Tokyo.

2017.04 – 2017.09

Teaching Assistant, Seismic Wave Theory, The University of Tokyo.

2016.09 – 2017.03

Mentor for an international student in master program, The University of Tokyo.

2016.06 – 2016.07

Tutor for two international internship students of University of Tokyo ResearchInternship Program, The University of Tokyo.

2015.06 – 2015.07

Tutor for two international internship students of Sakura Science Plan,
Earthquake Research Institute, The University of Tokyo.

2014.11 – 2014.11

Tutor for three international internship students of Sakura Science Plan,
Earthquake Research Institute, The University of Tokyo.

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Curriculum Vitae: Osamu Sandanbata (Last update: July 27, 2024)

Outreach Experiences
2015.08, 2016.08, and 2018.08
Open-laboratory experiment of tsunami generation/propagations in a miniaturetank, Earthquake Research Institute, The University of Tokyo.

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