Article
Engineering, Geological
Jiyuan Hu, Mahdi Motagh, Jiming Guo, Mahmud Haghshenas Haghighi, Tao Li, Fen Qin, Wenhao Wu
Summary: Through multitemporal interferometry analysis, four major subsidence zones in Wuhan, including both soft soil areas and karst terrain, were identified. The decline of shallow groundwater caused by engineering dewatering and industrial water depletion contributes to subsidence in the soft soil areas, while the presence of underground caves and fissures in the karst terrain is the main factor for gradual subsidence and karst collapse. The stage of karst development plays the most important role in influencing karst subsidence, followed by municipal construction, proximity to major rivers, and overlying soil structure.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
Zhuge Xia, Mahdi Motagh, Tao Li, Sigrid Roessner
Summary: This study investigated the destabilization and reactivation process of an ancient landslide near Aniangzhai village in Danba County, Sichuan Province of Southwest China using satellite remote sensing techniques. The analysis revealed that the toe of the landslide was undercut, leading to erosion from overflow of the landslide dam and water release from a nearby hydropower station. In addition, changes in precipitation were found to be correlated with kinematics of motion in different parts of the landslide.
Article
Environmental Sciences
Wei Tang, Xiangjun Zhao, Mahdi Motagh, Gang Bi, Jing Li, Mingjie Chen, Hua Chen, Mingsheng Liao
Summary: The impacts of groundwater management measures and inter-basin water transfer project on the aquifer system in Taiyuan basin, China, have been studied using integrated analysis. The research reveals that these measures have led to the alleviation of land subsidence, reduction in surface displacement, and significant seasonal displacement related to agricultural pumping irrigation.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Shagun Garg, Mahdi Motagh, J. Indu, Vamshi Karanam
Summary: This study investigates the effects of declining groundwater levels on land surface elevations in Delhi NCR, India. It identifies two subsidence areas with rates exceeding 11 cm/year and 3 cm/year, as well as one uplift area. It highlights a high-risk zone of ground movement covering approximately 100 square kilometers that requires urgent attention. The findings of this study are highly relevant for formulating new groundwater management policies in the region.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Mimi Peng, Zhong Lu, Chaoying Zhao, Mahdi Motagh, Lin Bai, Brian D. Conway, Hengyi Chen
Summary: This study utilized InSAR technology to investigate land subsidence in the Willcox Groundwater Basin, and employed independent component analysis to analyze the temporal patterns. Two different deformation features were identified in the basin. By integrating InSAR deformation data with groundwater level data, the response of the aquifer system to hydraulic head change was quantified, and the hydromechanical properties of the aquifer system were characterized.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
Deying Ma, Mahdi Motagh, Guoxiang Liu, Rui Zhang, Xiaowen Wang, Bo Zhang, Wei Xiang, Bing Yu
Summary: The thaw consolidation of degrading permafrost poses a serious hazard to infrastructure. By integrating interferometric measurements from radar images and volumetric water content data, this study quantifies the spatial variations in active layer thickness in Iqaluit, Canada. The findings provide valuable insights for hazard prevention and infrastructure operation in permafrost regions.
Article
Geosciences, Multidisciplinary
Federico Galetto, Valerio Acocella, Andrew Hooper, Marco Bagnardi
Summary: According to analysis of 45 unrest case studies and viscoelastic modeling, using magma inflow rate improves eruption forecasting on timescales of weeks to months for basaltic caldera systems, compared with using surface deformation alone. The study shows that magma inflow rate can indicate the probability of magma transfer towards the surface and eruption. Inflow rates >= 0.1 km(3) yr(-1) promote magma propagation and eruption within 1 year in all assessed case studies, whereas rates <0.01 km(3) yr(-1) do not lead to magma propagation in 89% of cases.
Article
Environmental Sciences
Zohreh Erfani Jazi, Mahdi Motagh, Volker Klemann
Summary: Using InSAR measurements near the Helheim glacier in southeastern Greenland, a maximum cumulative displacement of approximately 6 cm was detected, suggesting a mass loss of 8.33 Gt/year in that area.
Article
Geochemistry & Geophysics
Wim Simons, Taco Broerse, Lin Shen, Olga Kleptsova, Nicolai Nijholt, Andrew Hooper, Julie Pietrzak, Yu Morishita, Marc Naeije, Stef Lhermitte, Matthew Herman, Dina Anggreni Sarsito, Joni Efendi, Rob Govers, Christophe Vigny, Hasanuddin Zainal Abidin, Gatot Haryo Pramono, Cahyo Nugroho, Pieter Visser, Riccardo Riva
Summary: A devastating tsunami struck Palu Bay after the 2018 Palu earthquake in Indonesia. This study examines the contribution of co-seismic deformation to the tsunami. Using geodetic data, the researchers estimate a high-resolution 3D displacement field and simulate tsunami scenarios. They conclude that co-seismic deformation was the main driver behind the tsunami.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Jin Fang, Qi Ou, Tim J. Wright, Ryo Okuwaki, Ruth M. J. Amey, Tim J. Craig, John R. Elliott, Andy Hooper, Milan Lazecky, Yasser Maghsoudi
Summary: This study analyzes an earthquake that occurred on a secondary fault and determines the distribution of coseismic slip and afterslip. It also discusses the implications for seismic hazard away from major tectonic block boundaries.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Letter
Geosciences, Multidisciplinary
F. Liu, J. R. Elliott, S. K. Ebmeier, T. J. Craig, A. Hooper, C. Novoa Lizama, F. Delgado
Summary: We have detected the first signs of unrest at Socompa volcano using Interferometric Synthetic Aperture Radar measurements. The volcano has been steadily uplifting since November 2019, with a rate of 17.5 mm/year, indicating a pressure increase in an ellipsoidal source region. This uplift suggests the initiation of unrest at Socompa after a long period of stability.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Letter
Geosciences, Multidisciplinary
M. Lazecky, A. J. Hooper, P. Piromthong
Summary: Interferometric Synthetic Aperture Radar is used to measure deformation rates over continents, and the resulting measurements are relative due to unknown integer ambiguities caused by atmospheric signal propagation. However, by using spectral diversity, these ambiguities can largely cancel out, allowing measurements to be made with respect to a global reference frame. By combining data from different orbits, accurate absolute measurements of horizontal ground movement can be obtained, which are useful for global velocity and strain rate estimation.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Juanjuan Yu, Xiufeng He, Peng Yang, Mahdi Motagh, Jia Xu, Jiacheng Xiong
Summary: In this study, a novel combined framework that integrates UNet++ with a marker-controlled watershed segmentation strategy was developed to extract aquaculture boundaries from fully polarimetric GaoFen-3 SAR imagery. Experimental results showed that the proposed method could effectively handle the adhesion of adjacent objects and unclear boundaries, capturing clear and refined aquaculture boundaries.
Article
Geochemistry & Geophysics
Krisztina Kelevitz, Tim J. Wright, Andrew J. Hooper, Sivasakthy Selvakumaran
Summary: High-precision monitoring of infrastructure can be achieved using artificial reflectors, but large reflectors are often not feasible in urban areas. A multiple corner-reflector array can be used to replace a single large reflector, as long as careful positioning is done to ensure constructive interference. The applications of multiple small corner reflectors in urban areas are wide-ranging, including essential infrastructure monitoring and structural health assessment.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Engineering, Electrical & Electronic
Gabriel Martin, Andrew Hooper, Tim J. Wright, Sivasakthy Selvakumaran
Summary: This study explores the application of blind source separation algorithms to MT-InSAR for automatic identification of deformation patterns in buildings and structures. The proposed methodology is validated using synthetic and real MT-InSAR data, showing its effectiveness in InSAR time-series analysis and robustness to noise. This has significant implications for monitoring large-scale infrastructure and understanding the performance changes of structures over time.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2022)