Space Geodesy Research

The Geography and Crustal Dynamics Research Center of GSI has been making research data generated in the research process publicly available since July 2025. [ Research data portal ]

• The fifteenth Joint Meeting of the U.S.-Japan Panel on Earthquake Research (UJNR) (Sep. 2026)NEW!!
  • Nationwide crustal deformation mapping in Japan using L-band SAR data from ALOS-2 and ALOS-4[Abstract(PDF:424KB)]
  • Machine learning of the real GNSS displacement time series for automated SSE detection[Abstract(PDF:98KB)]
• AI-DeTect Kick-off Meeting（Aug. 2026）NEW!! 　　　　
  • GEONET monitoring system and crustal deformation studies using GEONET data in Japan
• Japan Geoscience Union Meeting 2026 (JpGU 2026) (May 2026)　
  • Development of research data portal
  • Advancement of InSAR tropospheric delay correction method(Part1): Reproducibility of tropospheric delay errors using numerical weather models
  • Regionally augmented real-time PPP-AR framework for multi-time scale deformation monitoring across Japan
  • Development of a new geodetic observation technique integrating GNSS and heterogeneous sensors: Real　seismic waves captured by MEMS sensor

• International Workshop on Interdisciplinary Research of Information Science and Seismology (IWIRISS 2025)(Nov. 2025)
  • Detection of Short-Term Slow Slip Signal Based on Machine Learning of Real GNSS Observations
• Asia-Pacific Conference on Synthetic Aperture Radar（APSAR 2025）(Oct. 2025）　
  • L-band-based InSAR with long temporal baseline for detection of medium- to long-term volcanic crustal deformation
• Scientific Assembly of the International Association of Geodesy (IAG 2025)（Aug.- Sep. 2025）
  • L-band SAR-based nationwide land deformation monitoring in Japan: application of ALOS-2/-4 satellites
  • Modeling the dynamic component of the gravimetric geoid model for Japan
  • Detection of short-term slow slip signal based on deep learning of the real GNSS displacement time series of southwest Japan
• The Japanese Society for Artificial Intelligence (May 2025)
  • Machine-learning-based detection of slow slip signal hidden in the GNSS displacement time series of southwest Japan
• Japan Geoscience Union Meeting 2025 (JpGU 2025) (May 2025)
  • Medium-to long-term volcanic deformation observed by InSAR time series analysis using long-term pairs
  • A Stable and Precise Computational Method for the Analytical Downward Continuation of Helmert Gravity Anomalies
  • A Preliminary Investigation into Quantitative Evaluation of Slope-Related Phase Difference on Mountainous Region in L-Band SAR Interferograms

• IAG Workshop on Asia Pacific Gravity, Geoid, and Vertical Datums 2024(Nov. 2024)
  • Current status of the Japan geoid in 2024[Abstract(PDF：78KB)]
• The Fourteenth Joint Meeting of the U.S.-Japan Panel on Earthquake Research (UJNR) (Sep. 2024)　
  • Nationwide crustal deformation monitoring by SAR satellite[Abstract(PDF:2.5MB)]
  • SAR-detected crustal deformation and topographic changes of the 2024 Noto Peninsula earthquake[Abstract(PDF:1.0MB)]　
• Symposium on Gravity, Geoid, and Height Systems 2024(Sep. 2024)
  • JGEOID2024: the Japanese gravimetric geoid model incorporating nationwide airborne gravity data[Abstract(PDF:106KB)]　　
• Japan Geoscience Union Meeting 2024 (JpGU 2024) (May 2024)　　　　　　　　　　
  • Consistency between multi-GNSS PPP solutions and F5 solutions and among multi-GNSS PPP solutions from different analysis methods　　　　　
  • Geoid changes in and around Japan　　　
  • Development and test observation of compact and small GNSS observation instrument
  • Detection and correction of phase unwrapping error for more efficient InSAR time series analysis
• Seismological Society of America Annual Meeting 2024 (May, 2024)　　　　　　　　　
  • Geodetically estimated ground displacement and fault motions of the 2024 Noto Peninsula Earthquake【Invited】[→LINK]

• SBI (Split-bandwidth Interferometry) for displacement measurement（Case）
• MAI (Multiple Aperture Interferometry)（Case1）（Case2）
• Pixel Offset method using SAR images（Case）
• Additive color process using SAR amplitude images（Case1）(Case2）

• KOBAYASHI, Tomokazu : Director of Division
• NAKAGAWA, Hiroyuki : Chief Researcher
• MATSUO, Koji : Chief Researcher
• ISHIMOTO, Masayoshi : Chief Researcher
• TAKAMATSU, Naofumi : Chief Researcher
• TANAKA, Yusuke: Researcher

• Development of a new geodetic observation technique integrating GNSS and heterogeneous sensors
  (2024-2028) ［Proposal [PDF: 1.98MB(japanese)］

• Takamatsu N., Ohta Y., He S., Brack A. (2026): A novel real-time PPP-AR framework for continuous crustal deformation monitoring across Japan, Earth Planets Space, 78, 218. https://doi.org/10.1186/s40623-026-02547-z
• Kobayashi T., Himematsu Y., Nakano T., Ichimura M., Ishimoto M., Nakashima M., Hattori A. (2026): Surface displacements in inland areas associated with the 2024 Noto Peninsula earthquake ―Postseismic deformation on secondary fault detected from InSAR images―, Active Fault Research, 64, 19-35. [Data]
• Kobayashi T. and Ishimoto M. (2026): Surface displacements in inland areas associated with the 2024 Noto Peninsula earthquake ―Secondary fault motions detected from InSAR images―, Active Fault Research, 64, 1-18. [Data]
• Kobayashi T., Nakagawa H., Himematsu Y., Iwahashi J., Ito Y., Serizawa Y., Takano K., Marvit K., Kudo N, Development of research data portal，Bulletin of the GSI, 69, 7-13. https://doi.org/10.57499/BULLETIN_069_02
• Jones C. E., Rosenqvist A., Rommen B., Fitrzyk M., Rignot E., Scheuchl B., Zheng Y., Hooper A., Simons M., Kobayashi T., Siqueira P., Santoro M., Tadono T., Hess L., McNairn H., Frulla L., Johansson M., Dierking W., Rouyet L., Bartsch A., Dekker P. L., and Johannessen J. A. (2026) Observation and Coordination Needs for Current, Near-Future, and Next Generation Earth-Observing SAR Systems, Earth and Space Science, 13, e2025EA004868. https://doi.org/10.1029/2025EA004868

• Ichimura M., Mikihara K., Ishimoto M., Kobayashi T., Munekane H.(2025): Ground deformation after the 2015 phreatomagmatic eruption at Kuchino-Erabujima Volcano, Japan detected by InSAR time series analysis with ALOS-2 data, Earth Planets Space 77, 155. https://doi.org/10.1186/s40623-025-02293-8
• Kobayashi T., Munekane H., Ishimoto M. (2025)： Artificial satellite-detected crustal deformation and fault motions of the 2024 Noto Peninsula Earthquake, Active Fault Research, 62, 11-15.https://doi.org/10.11462/afr.2025.62_11　[Data]

• Matsumoto, S., McCallum, L., McCallum, J., Jaradat, A., Ishigak, M., yoshifuji, H., Kobayashi, T. (2023): The Australia-Japan VGOS observation, Proceedings of the 26th European VLBI Group for Geodesy and Astrometry Working Meeting, edited by Rudiger Haas, Eva Schroth, Alexander Neidhardt, 121–124. https://doi.orj/10.14459/2023md1730292
• Kobayashi T., Munekane, H., Kuwahara, M., Furui, H. (2023): Insights on the 2023 Kahramanmaraş Earthquake, Turkey, from InSAR: fault locations, rupture styles and induced deformation, Geophysical Journal International, 236, (2), 1068–1088. https://doi.org/10.1093/gji/ggad464
• Matsumoto, S., Nakakuki, T., Yutsudo, T., Ueshiba, H., Takagi, Y., Hayashi, K., Mori, K., Sato, Y., Kobayashi, T. (2023): Status of the Ishioka VLBI Station for the Past Two Years, International VLBI Service for Geodesy and Astrometry 2022 General Meeting Proceedings, NASA/CP-20220018789, pp56-58. [→LINK]

• Matsumoto, S., Ueshiba, H., Nakakuki, T., Takagi, Y., Hayashi, K., Yutsudo, T., Mori, K., Sato, Y., Kobayashi, T. (2022): An effective approach for accurate estimation of VLBI–GNSS local-tie vectors, Earth, Planets and Space, 74, 147. https://doi.org/10.1186/s40623-022-01703-5
• Morishita, Y. (2022): Effective unwrapping of complicated phases by exploiting multiple interferograms: a case study of the 2016 Kumamoto earthquake, Earth Planets Space, 74, 33. https://doi.org/10.1186/s40623-022-01595-5
• Morishita, Y., Kobayashi, T. (2022): Three-dimensional deformation and its uncertainty derived by integrating multiple SAR data analysis methods, Earth Planets Space, 74, 16. https://doi.org/10.1186/s40623-022-01571-z

• Wang, YM., Sánchez, L., Ågren, J., Huang, J., Forsberg, R., ..., Matsuo, K., et al. (2021): Colorado geoid computation experiment: overview and summary, Journal of Geodesy, 95, 127. https://doi.org/10.1007/s00190-021-01567-9
• Morishita, Y. (2021): Nationwide urban ground deformation monitoring in Japan using Sentinel-1 LiCSAR products and LiCSBAS, Prog. Earth Planet. Sci., 8, 6. https://doi.org/10.1186/s40645-020-00402-7

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