Faculty Profiles - ITO Takeo

Papers - ITO Takeo

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Probing asthenospheric density, temperature and elastic moduli below the Western United States Reviewed

T. Ito and M. Simons

Science Vol. 322 ( 6032 ) page： 947-951 2011.4

Physics-informed deep learning approach for modeling crustal deformation

Okazaki, T; Ito, T; Hirahara, K; Ueda, N

NATURE COMMUNICATIONS Vol. 13 ( 1 ) 2022.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Communications

The movement and deformation of the Earth’s crust and upper mantle provide critical insights into the evolution of earthquake processes and future earthquake potentials. Crustal deformation can be modeled by dislocation models that represent earthquake faults in the crust as defects in a continuum medium. In this study, we propose a physics-informed deep learning approach to model crustal deformation due to earthquakes. Neural networks can represent continuous displacement fields in arbitrary geometrical structures and mechanical properties of rocks by incorporating governing equations and boundary conditions into a loss function. The polar coordinate system is introduced to accurately model the displacement discontinuity on a fault as a boundary condition. We illustrate the validity and usefulness of this approach through example problems with strike-slip faults. This approach has a potential advantage over conventional approaches in that it could be straightforwardly extended to high dimensional, anelastic, nonlinear, and inverse problems.

DOI： 10.1038/s41467-022-34922-1

Web of Science

Scopus

PubMed

Asthenosphere rheology inferred from observations of the 2012 Indian Ocean earthquake Reviewed

Yan Hu, Roland Bürgmann, Paramesh Banerjee, Lujia Feng, Emma M. Hill, Takeo Ito, Takao Tabei, and Kelin Wang

Nature 2016.10

Complex rupture during the 12 January 2010 Haiti Earthquake Reviewed

R. Briggs, A. Sladen, E. Fielding, C. Prentice, K. Hudnut, P. Mann, F. Taylor, A. Crone, R. Gold, T. Ito and M. Simons

Nature Geoscience 2010.5

Physics-Informed Deep Learning for Forward and Inverse Modeling of Inplane Crustal Deformation Reviewed

Okazaki, T., Hirahara, K., Ito, T., Kano,M., & Ueda, N.

Journal of Geophysical Research:Machine Learning and Computation Vol. 2 ( e2024JH000474 ) 2025.3

Exploring Volcanic Activity Through Open Data in Mount Ruang’s 2024 Eruption Reviewed International coauthorship

Agustan, Takeo ITO, Estu Kriswati, Marina C.G. Frederik, Arif Aditiya, Djoko Nugroho

2024 IEEE Asia-Pacific Conference on Geoscience, Electronics and Remote Sensing Technology (AGERS) 2024.12

Temporary slip speed increases during short-term slow slip events with durations of one to three hours Open Access

Katsumata A., Miyaoka K., Tsuyuki T., Itaba S., Tanaka M., Ito T., Takamori A., Araya A.

Earth, Planets and Space Vol. 76 ( 1 ) 2024.12

Publisher：Earth, Planets and Space

Temporary slip speed increases with durations of 1–3 h were identified during short-term slow slip events in records of borehole and laser strainmeters in the Tokai region, Japan. They were found by searching for peaks of correlation coefficients between stacked strain data and ramp functions with rise times of 1 and 2 h. Although many of the strain steps were considered due to noise, some strain steps occurred with simultaneous activation of the deep tectonic tremors and shared source areas with the tremors. From 2016 to 2022, we observed five strain steps with simultaneous activation of tectonic tremors and coincidence of source locations with the tremors. Those strain steps occurred during short-term slow slip events and were temporary slip speed increases of the slow slip events. Those strain steps seemed to be related to successive occurrences with source migration of short-term slow slip events. The detrended strain steps corresponded to plate boundary slip events of moment magnitude around 5, which was consistent with the scaling law of slow earthquakes. Graphical Abstract: (Figure presented.)

DOI： 10.1186/s40623-024-01983-z

Open Access

Scopus

Temporary slip speed increases during short-term slow slip events with durations of one to three hours Reviewed

Earth, Planets and Space Vol. 76 ( 45 ) 2024.3

Evaluation of earthquake potential using a kinematic crustal block motion model in Java, Indonesia, based on GNSS observation Reviewed International coauthorship

R. Raharja, T. Ito, I. Meilano

Journal of Asian Earth Sciences: X Vol. 1 2024.1

Bouguer Anomaly around Mt. Ontake

Shirayama Tomoyuki, Ichihara Hiroshi, Ito Takeo, Kudo Takeshi, Horikawa Shinichiro, Matsuhiro Kenjiro, Mogi Toru, Honda Ryo, Miyagi Yosuke

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN Vol. 2024 ( 0 ) page： 148 - 148 2024

Present-day land subsidence over Semarang revealed by time series InSAR new small baseline subset technique

Aditiya A., Ito T.

International Journal of Applied Earth Observation and Geoinformation Vol. 125 2023.12

Publisher：International Journal of Applied Earth Observation and Geoinformation

Over the last two decades, Semarang, located in the central region of Java island, Indonesia, has been undergoing significant land subsidence. Mainly attributed to reservoir compaction and fluid extraction, this subsidence has pronounced effects in coastal regions. However, the existing study on the details of subsidence and its application to accurately depict present circumstances has been insufficient. Utilizing the new small baseline subset technique and C-band SAR data from 2015 to 2022, this study delineates the spatial boundaries of land subsidence in Semarang and surrounding areas. Atmospheric effects were mitigated using the GACOS model during InSAR processing. The study reveals dominant vertical movements in Semarang's north coastal area, characterized by rapid and extensive changes. In contrast, horizontal movement shows relatively small changes in number to the east of the study area. Time series analysis indicates maximum subsidence rate of 100–120 mm/year in the northern and eastern part of Semarang and Demak. Available data from GNSS stations ensures the reliability of these findings. The correlation coefficient of 0.86 indicated substantial association between groundwater and deformation. Approximately 20 % of Semarang's land area is affected by land subsidence, which is notably more prevalent in alluvial soils and densely populated regions. In Demak, subsidence is primarily observed in agricultural regions, whereas in Kendal, the 50 mm/year subsidence rate represents a growing concern. This accelerating phenomenon poses substantial risks to the local environment and economic sectors. All authorities must harmonize regulations to force their roles, produce details spatial plan maps, and establish mitigation and adaptation infrastructure to handle the current crisis realistically.

DOI： 10.1016/j.jag.2023.103579

Scopus

Time Series InSAR Analysis over Jakarta Metropolitan Area Invited Reviewed International coauthorship

Agustan, Takeo Ito, Estu Kriswati, Hari Priyadi, Heri Sadmono, Rika Hernawati

2022 IEEE Asia-Pacific Conference on Geoscience, Electronics and Remote Sensing Technology 2023.4

Time Series InSAR for Ground Deformation Observation in Semarang Area, Central Java Reviewed

APSAR 2023 - 2023 8th Asia-Pacific Conference on Synthetic Aperture Radar 2023

Language：English Publishing type：Research paper (international conference proceedings) Publisher：APSAR 2023 - 2023 8th Asia-Pacific Conference on Synthetic Aperture Radar

The initiatives of open data and open platforms, combined with on-demand data processing in Synthetic Aperture Radar (SAR), enable more straightforward and accessible ground deformation research worldwide. The Alaska Satellite Facility Distributed Active Archive Center (ASF DAAC) provides high-quality interferogram combination pairs based on the Small Baseline Subset (SBAS) technique and on-demand InSAR data analysis known as HyP3. HyP3 offers unwrapped phase data from Sentinel-1 satellites and other derived products that can be utilized with open-source deformation software such as Mintpy. This research aims to assess the quality of interferogram combination pairs by configuring networks of perpendicular and temporal baselines for observing ground deformation in Semarang, Central Java, Indonesia. The study demonstrates that HyP3 products enable time series analysis to determine deformation rates. Over 8.4 years, from November 15th, 2014, to April 14th, 2023, the Simpang Lima landmark in Semarang experienced an approximate subsidence rate of -0.87 cm/year. However, the maximum subsidence rate of approximately 11 cm/year was observed in the southeastern part of Semarang.

DOI： 10.1109/APSAR58496.2023.10388980

Scopus

Machine-learning-based detection of volcano seismicity using the spatial pattern of amplitudes Reviewed

Y. Maeda,Y. Yamanaka, T. Ito, S. Horikawa

Geophysical Journal International Vol. 225 ( 1 ) page： 416 - 444 2021.4

Land Subsidence Rate of Jakarta Metropolitan Area Observed By Stacking Sentinel-1 Data

Agustan, A; Kriswati, E; Ito, T; Abdullah, FM; Anantasena, Y; Nugroho, D

2021 IEEE ASIA-PACIFIC CONFERENCE ON GEOSCIENCE, ELECTRONICS AND REMOTE SENSING TECHNOLOGY (AGERS-2021) page： 69 - 72 2021

Publisher：2021 IEEE Asia-Pacific Conference on Geoscience, Electronics and Remote Sensing Technology, AGERS 2021 - Proceeding

The growth of Jakarta metropolitan area as capital city is increase from time to time. Even the rate of population growth tends to decline, but population still stresses Jakarta environment. The surface changes and ground deformation related to city growth can be observed continuously by satellite-based remote sensing. The launch of Sentinel-1 satellite with radar mission through Copernicus, which is a joint initiative of the European Commission and European Space Agency, enables continuous observation of earth's surface. This paper describes a study of ground deformation rate of Jakarta metropolitan area observed by processing Sentinel-1 data based on interferometric Synthetic Aperture Radar method. Only small perpendicular baselines of SAR data pairs are selected from 2015 to 2019 to avoid the use of external Digital Elevation Model data. The land subsidence rate is obtained by stacking the unwrapped phase and it is found that the rate is different across the region. In the western part, the rate is around -2cm/year whereas in the eastern part is around -3cm/year. The pattern and the rate of land subsidence are confirmed by ascending and descending orbit direction.

DOI： 10.1109/AGERS53903.2021.9617239

Web of Science

Scopus

Urgent Joint Seismic Observation Data of the 2016 Kumamoto Earthquakes

SHITO Azusa, MITSUOKA Ayaho, MATSUMOTO Satoshi, MATSUSHIMA Takeshi, AIZAWA Koki, SHIMIZU Hiroshi, UCHIDA Kazunari, KAMIZONO Megumi, TEGURI Yoshiko, NAKAMOTO Manami, MIYAMACHI Rintaro, ICHIYANAGI Masayoshi, OHZONO Mako, OKADA Kazumi, KATSUMATA Kei, TAKADA Masamitsu, TAKAHASHI Hiroaki, TANIOKA Yuichiro, YAMAGUCHI Teruhiro, KOSUGA Masahiro, AZUMA Ryosuke, UCHIDA Naoki, EMOTO Kentaro, OHTA Yusaku, OKADA Tomomi, KAIDA Toshiki, KOZONO Tomofumi, SUZUKI Syuichi, TAKAGI Ryota, DEMACHI Tomotsugu, NAKAHARA Hisashi, NAKAYAMA Takashi, HIRAHARA Satoshi, MATSUZAWA Toru, MIURA Satoshi, YAMAMOTO Mare, IMANISHI Kazutoshi, UCHIDE Takahiko, YOSHIMI Masayuki, AOI Shin, ASANO Youichi, UENO Tomotake, FUJITA Eisuke, ABE Eiji, IIDAKA Takashi, IWASAKI Takaya, KATO Aitaro, KURASHIMO Eiji, SAKAI Shin’ichi, SHIINA Takahiro, SERIZAWA Masato, TANAKA Shinichi, NAKAGAWA Shigeki, HIRATA Naoshi, MASUDA Masataka, MIYAKAWA Koji, YAGI Takeo, WATANABE Atsushi, GOTO Kazuhiko, ITO Takeo, OKUDA Takashi, TERAKAWA Toshiko, HORIKAWA Shinichiro, MAEDA Yuta, MATSUHIRO Kenjiro, YAMANAKA Yoshiko, WATANABE Toshiki, IIO Yoshihisa, KATAO Hiroshi, KANO Yasuyuki, TSUDA Hiroo, MIURA Tsutomu, MURAMOTO Tomoya, YAMASHITA Yusuke, OKUBO Makoto, YAMASHINA Tadashi, OHKURA Takahiro, NAKAO Shigeru, HIRANO Shuichiro, MIYAMACHI Hiroki, YAKIWARA Hiroshi

Zisin (Journal of the Seismological Society of Japan. 2nd ser.) Vol. 73 ( 0 ) page： 149 - 157 2020.10

Earthquake potential in Costa Rica using three scenarios for the Central Costa Rica Deformed Belt as western boundary of the Panama Microplate Reviewed

Luis Alejandro Carvajal Soto, T. Ito, M. Protti, H. Kimura

Journal of South American Earth Sciences Vol. 97 page： 102375 2020.1

Ground Deformation Identification related to 2018 Lombok Earthquake Series based on Sentinel-1 Data Reviewed

Agustan, Rahma, N. Hanifa, Yudi Anantasena, M. Sadly, Takeo Ito

The 4th International Conference of Indonesian Society for Remote Sensing Vol. 280 ( 1 ) 2019.8

Interplate Coupling Distribution along the Nankai Trough in Southwest Japan estimated from the Block Motion Model based on Onshore GNSS and Seafloor GNSS/A Observations Reviewed

H. Kimura, K. Tadokoro and T.Ito

Journal of Geophysical Research Vol. 124 ( 6 ) page： 6140 - 6164 2019.6

Evaluation of the 2012 Indian Ocean coseismic fault model in 3-D heterogeneous structure based on vertical and horizontal GNSS observation, Reviewed

C. Pratama, T. Ito, T. Tabei, F. Kimata, E. Gunawan, Y. Ohta, T. Yamashina, I. Nurding, D. Sugiyanto, U. Muksin, N. Ismail, I. Meilano

AIP Conference Proceedings Vol. 1987 ( 1987 ) page： 020011 2018.7

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Papers - ITO Takeo