Article
Geochemistry & Geophysics
Nikos Svigkas, Simone Atzori, Andrey Kozhurin, Cristiano Tolomei, Andrea Antonioli, Giuseppe Pezzo
Summary: On January 9, 2020, a M6.4 strike-slip earthquake occurred in the Bering Sea, north of the Asian margin. The earthquake revealed a previously unknown active fault with left-lateral kinematics, crossing the Khatyrka-Vyvenka fault zone. This fault structure, along with another similar structure to the east, has created a segmented, step-like boundary of the plate/stream.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Sandra Slead, Meng (Matt) Wei
Summary: Interferometric Synthetic Aperture Radar (InSAR) is used to measure ground deformation caused by underground nuclear testing, and a finite-element model (FEM) is presented to analyze the nuclear test site in North Korea using InSAR data. The model incorporates topography, mechanical heterogeneity and simulates elastic deformation caused by underground explosions. Results show that mechanical layering has a significant impact on deformation modeling. A parameter search is performed to estimate the yield and depth of burial for the 4th nuclear test in North Korea. The study provides an independent and complementary method for estimating yield in data-limited regions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Ping He, Yangmao Wen, Shuiping Li, Kaihua Ding, Zhicai Li, Caijun Xu
Summary: The Tien Shan is the largest and most active intracontinental orogenic belt on Earth, providing a natural laboratory for understanding Cenozoic orogenic processes driven by the India-Asia collision. A Mw 6.1 earthquake that struck the Kalpin region on January 19, 2020 has highlighted the ongoing orogenic processes and potential seismic hazard in the area. Analysis of geodetic observations has revealed a nearly subhorizontal decollement plane in the region, indicating a risk of frequent moderate earthquakes in the future.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
D. W. Vasco, Sergey Samsonov, Kang Wang, Roland Burgmann, Pierre Jeanne, William Foxall, Yingqi Zhang
Summary: This study uses InSAR observations to estimate the displacements at a natural gas storage site in Honor Rancho, California. By removing the reservoir signal, the residuals are used to characterize the background variations and identify anomalies. The results show temporal and spatial variations in the residuals, with larger displacements observed in a southern alluvial valley.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
D. W. Vasco, Sergey Samsonov, Kang Wang, Roland Burgmann, Pierre Jeanne, William Foxall, Yingqi Zhang
Summary: The study utilizes InSAR observations for estimating line-of-sight displacements, showing potential value in characterizing surface deformation background and detecting unusually large residuals.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Gen Li, Zegang Ding, Mofan Li, Tianyi Zhang, Tao Zeng, Teng Long
Summary: This article investigates the baseline formation mechanism of Earth-based repeat-pass synthetic aperture radar (SAR) interferometry of the Moon and proposes a precise relative motion model considering lunar libration. Additionally, the effects of subradar point (SRP) wagging on InSAR coherence are analyzed.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Geochemistry & Geophysics
Hailu Chen, Yunzhong Shen
Summary: In this study, a new approach is proposed to improve the quality of InSAR interferograms by incorporating GNSS data and modeling SCEs as signals. The LSC-GInSAR approach effectively mitigates SCEs and produces displacements that are more consistent with GNSS observations compared to the GInSAR method, resulting in a significant improvement in quality.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Environmental Sciences
Stephen Grebby, Andrew Sowter, Jon Gluyas, David Toll, David Gee, Ahmed Athab, Renoy Girindran
Summary: The catastrophic failure of a tailings dam in Brazil led to significant loss of lives and environmental damage. Advanced analysis of remote sensing data suggests that satellite-based monitoring techniques could help predict similar disasters in the future.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Mahin Jafari, Mahtab Aflaki, Zahra Mousavi, Andrea Walpersdorf, Khalil Motaghi
Summary: The Ganaveh earthquake occurred on April 18, 2021 in the southwest of the Dezful embayment, Iran. It was a mainly compressive event with a magnitude of M-w 5.8. The InSAR coseismic displacement maps showed a maximum surface displacement of 17 cm in the satellite line of sight. The earthquake occurred within the competent layers of the Zagros sedimentary cover, beneath the Gachsaran formation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Engineering, Geological
Andre Vervoort
Summary: After the closure of several coal fields in Europe, a new phenomenon of surface uplift above abandoned coal mines was observed, potentially linked to underground flooding. The values of uplift varied spatially and over time, with a gradual decrease in uplift rate observed over a 20-year period.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Geochemistry & Geophysics
Katarina Vardic, Peter J. Clarke, Pippa L. Whitehouse
Summary: The two main causes of global-scale secular deformation of the Earth are tectonic plate motion and glacial isostatic adjustment (GIA). Through the creation of a global GNSS surface velocity field, researchers investigated the effects of plate motion and GIA on plate motion models. The study found that uncorrected GIA-related horizontal motion can bias plate motion models.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Fengshun Zhu, Xin Liu, Zhen Li, Jiajia Yuan, Jinyun Guo, Heping Sun
Summary: Mass redistribution in the Earth system induces variations of the Earth's gravity field. We propose estimating high-resolution marine gravity trend using sea level trend, and find that marine gravity in the Bay of Bengal is rising. This is important for studying small-scale mass migration near subduction boundaries.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Dong Yanfang, Meng Guojie, Hong Shunying
Summary: This study investigates the coseismic and post-seismic deformation of the 2017 Jinghe earthquake in Xinjiang, western China, using SAR imagery and analyses its fault geometry. The results suggest that the earthquake is a typical inland thrust event with a buried fault beneath a fold. No significant post-seismic deformation was observed in the zone of coseismic deformation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Nematollah Ghayournajarkar, Yo Fukushima
Summary: Earthquake source parameters are vital for assessing seismic hazard. Sparse seismic monitoring networks in many countries result in relatively low accuracy of earthquake source parameters. InSAR is a useful tool for accurately determining fault parameters of shallow inland earthquakes. This study compares the fault parameters obtained from InSAR with those derived from local and global seismic data to evaluate the credibility of earthquake catalogs. The results show differences in the accuracy of earthquake catalogs between Iran and Japan.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
A. Koulali, P. J. Clarke
Summary: In this study, a Gaussian process is used to model quasi-periodic signals in geodetic time-series, capturing variability structure using covariance functions. The method provides a better fit to the time-series, with fewer systematic effects, as evaluated using the Markov Chain Monte Carlo method. This approach proves effective for estimating secular velocities of GPS sites and Gravity Recovery and Climate Experiment time-series.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Richard Czikhardt, Hans van der Marel, Freek J. van Leijen, Ramon F. Hanssen
Summary: In this study, the Signal-to-Clutter Ratio (SCR) of a radar point target, such as a corner reflector, was estimated using a time series of SAR measurements, assuming temporal ergodicity. The results showed that the temporal method provided a less biased and more precise estimate of the average SCR compared to the traditional method relying on spatial ergodicity assumption. Additionally, the use of SCR estimated by the temporal estimation method led to closer predictions of InSAR phase variance and positioning precision.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Engineering, Geological
Gertjan van Zwieten, E. Harald van Brummelen, Ramon F. Hanssen
Summary: Earthquakes cause lasting deformation that can be observed and inferred through deformation measurements. The Weakly-enforced Slip Method (WSM) accurately recovers slip distributions in a Bayesian-inference setting, offering modeling flexibility and reducing model restrictions in earthquake inversion problems.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Engineering, Civil
Kristina J. Reinders, Giorgia Giardina, Florian Zurfluh, Juerg Ryser, Ramon F. Hanssen
Summary: This article highlights the importance of utilizing InSAR techniques for monitoring in the planning and design stages of infrastructure projects. It provides an operational framework for integrating InSAR monitoring into geotechnical design codes and demonstrates its practicality with a case study.
TRANSPORTATION GEOTECHNICS
(2022)
Article
Geochemistry & Geophysics
Gert Mulder, Freek J. van Leijen, Ramon F. Hanssen
Summary: The observed phase in InSAR products is a combination of various components, including differential topography, line-of-sight displacements, and differential atmospheric delays. Isolating the atmospheric component has been challenging due to its dynamic and superposed nature. In this study, we propose a method to characterize the stochastic properties of atmospheric delays as a means to define the atmospheric signal. By using structure functions, we can describe the spatiotemporal variability of InSAR atmospheric delays and quantify atmospheric noise in deformation time series.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Damian Tondas, Maya Ilieva, Freek van Leijen, Hans van der Marel, Witold Rohm
Summary: This research aims to develop a fusion methodology for continuous monitoring of ground deformations, combining Differential Interferometry SAR and Global Navigation Satellite Systems monitoring techniques. By utilizing the forward and backward Kalman filter algorithms, the methodology optimizes the detection of nonlinear deformations. Experimental tests were conducted in the Upper Silesian coal mining region, showing that the Kalman filter integration outperforms traditional approaches in terms of accuracy.
JOURNAL OF GEODESY
(2023)
Article
Soil Science
Philip Conroy, Simon A. N. van Diepen, Ramon F. Hanssen
Summary: SPAMS is a simple parameterization model for describing the motion of deformable soils, capable of accurately estimating the vertical component of surface displacement, making it a powerful tool in inverse problems.
Article
Geochemistry & Geophysics
Wietske S. Brouwer, Ramon F. Hanssen
Summary: This article studies the estimation of displacement vectors for objects on the Earth's surface using satellite InSAR and proposes a solution to guarantee the validity and quality of displacement vector estimates. It introduces the concept of the null line as a key metric for InSAR geometry and bias estimation and proposes a new unbiased reference system. The article evaluates current operational practice and provides recommendations for InSAR product generation and interpretation.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Proceedings Paper
Geosciences, Multidisciplinary
Philip Conroy, Simon A. N. van Diepen, Freek J. van Leijen, Ramon F. Hanssen
Summary: This article presents a novel InSAR processing scheme that combines point scatterer and distributed scatter approaches, along with contextual information, to accurately estimate the deformation time series of Dutch peatlands. Additionally, a segmented processing scheme is introduced to manage irreversible coherence losses in the interferogram stack. Initial results show promising agreement with in-situ ground truth measurements.
2022 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2022)
(2022)
Article
Geochemistry & Geophysics
Philip Conroy, Simon A. N. van Diepen, Sanneke Van Asselen, Gilles Erkens, Freek J. van Leijen, Ramon F. Hanssen
Summary: Phase unwrapping is a challenging problem in SAR interferometry, particularly for distributed scatterer InSAR. We propose a method that integrates additional environmental information and uses machine learning algorithms to predict problematic epochs, helping in the interpretation of large phase changes.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Engineering, Electrical & Electronic
Fengming Hu, Kevin C. Helfer, A. Pier Siebesma, Ramon F. Hanssen
Summary: Atmospheric delay has a significant impact on synthetic aperture radar (SAR) interferometry, especially on the turbulent and convective part of the atmosphere at smaller spatial and temporal scales. In order to accurately model the 3-D distribution of turbulent refractivity in the boundary layer, advanced large Eddy simulation (LES) models can be used. Using LES models, it has been found that tropospheric delay variation leads to significant phase errors within several minutes, even when using a perfect weather model with similar resolutions to the SAR image. LES models can be a realistic instrument for InSAR quality-assessments and for the development and simulation of future missions.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2022)
Article
Geochemistry & Geophysics
Gert Mulder, Freek J. van Leijen, Jan Barkmeijer, Siebren de Haan, Ramon F. Hanssen
Summary: Numerical weather prediction models are limited by available observations, while satellite radar interferometry can provide high-resolution atmospheric information for assimilation. This study introduces a method to estimate atmospheric delays by combining InSAR data with NWP model data, mitigating the effects of deformation and decorrelation. The approach allows for repetitive updates with a spatial resolution of 500 m, suitable for assimilation into numerical weather models.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Remote Sensing
A. L. van Natijne, T. A. Bogaard, F. J. van Leijen, R. F. Hanssen, R. C. Lindenbergh
Summary: Landslides are major geohazards in hilly and mountainous areas. In-situ inspection of downslope motion is costly and sometimes dangerous. Remote sensing using Interferometric Synthetic Aperture Radar (InSAR) is a valuable method for systematically detecting and characterizing landslides on a large scale. This study presents a generic approach to assess the potential of InSAR-based deformation tracking, providing a standardized and automated method applicable to any slope. The researchers demonstrate that deformation can be detected on at least 91% of global landslide-prone slopes and provide a Google Earth Engine tool for assessing the availability of potential coherent scatterers.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2022)