scholarly journals Ground surface deformation monitoring of an active volcano using the DInSAR technique in comparison with GPS data: Case study of Okmok Volcano, Alaska

2020 ◽  
Author(s):  
Dariusz Głąbicki
Keyword(s):  
Surface Deformation ◽  
Ground Surface ◽  
Active Volcano ◽  
Deformation Monitoring ◽  
Gps Data ◽  
Okmok Volcano

scholarly journals Surface deformation monitoring of Augustine volcano, Alaska using GPS measurement - A case study of the 2006 eruption -

2013 ◽  
Vol 29 (5) ◽  
pp. 545-554
Author(s):  
Su-Kyung Kim ◽  
Eui-Hong Hwang ◽  
Young-Hwa Kim ◽  
Chang-Wook Lee
Keyword(s):  
Surface Deformation ◽  
Deformation Monitoring ◽  
Gps Measurement ◽  
2006 Eruption

Survey and cause analyses of ground surface deformation near a foundation pit slope: a case study in the Three Gorges area, China

2014 ◽  
Vol 75 (1) ◽  
pp. 13-31 ◽  
Author(s):  
Guangcheng Zhang ◽  
Ni Xie ◽  
Huiming Tang ◽  
Lu Zhang ◽  
Jiangpeng Wu
Keyword(s):  
Surface Deformation ◽  
Ground Surface ◽  
Three Gorges ◽  
Foundation Pit ◽  
Three Gorges Area ◽  
The Three Gorges

scholarly journals Application of InSAR and gravimetric surveys for developing construction codes in zones of land subsidence induced by groundwater extraction: case study of Aguascalientes, Mexico

2015 ◽  
Vol 372 ◽  
pp. 121-127 ◽  
Author(s):  
J. Pacheco-Martínez ◽  
S. Wdowinski ◽  
E. Cabral-Cano ◽  
M. Hernández-Marín ◽  
J. A. Ortiz-Lozano ◽  
...  
Keyword(s):  
Time Series ◽  
Land Subsidence ◽  
Local Governments ◽  
Surface Deformation ◽  
Geophysical Methods ◽  
Deformation Monitoring ◽  
The State ◽  
Groundwater Extraction ◽  
Hazard Zoning

Abstract. Interferometric Synthetic Aperture Radar (InSAR) has become a valuable tool for surface deformation monitoring, including land subsidence associated with groundwater extraction. Another useful tools for studying Earth's surface processes are geophysical methods such as Gravimetry. In this work we present the application of InSAR analysis and gravimetric surveying to generate valuable information for risk management related to land subsidence and surface faulting. Subsidence of the city of Aguascalientes, Mexico is presented as study case. Aguascalientes local governments have addressed land subsidence issues by including new requirements for new constructions projects in the State Urban Construction Code. Nevertheless, the resulting zoning proposed in the code is still subjective and not clearly defined. Our work based on gravimetric and InSAR surveys is aimed for improving the subsidence hazard zoning proposed in the State Urban Code in a more comprehensive way. The study includes a 2007–2011 ALOS InSAR time-series analysis of the Aguascalientes valley, an interpretation of the compete Bouguer gravimetric anomaly of the Aguascalientes urban area, and the application of time series and gravimetric anomaly maps for improve the subsidence hazard zoning of Aguascalientes City.

scholarly journals COMPENSATION OF THE IONOSPHERIC EFFECTS ON SAR INTERFEROGRAM BASED ON RANGE SPLIT-SPECTRUM AND AZIMUTH OFFSET METHODS – A CASE STUDY OF YUSHU EARTHQUAKE

2018 ◽  
Vol XLII-3 ◽  
pp. 505-509
Author(s):  
Y. F. He ◽  
W. Zhu ◽  
Q. Zhang ◽  
W. T. Zhang
Keyword(s):  
Surface Deformation ◽  
Low Frequency ◽  
Deformation Monitoring ◽  
Yushu Earthquake ◽  
Ionospheric Effects ◽  
Ground Deformations ◽  
Ionosphere Disturbance ◽  
Geophysical Processes ◽  
Split Spectrum

InSAR technique can measure the surface deformation with the accuracy of centimeter-level or even millimeter and therefore has been widely used in the deformation monitoring associated with earthquakes, volcanoes, and other geologic process. However, ionospheric irregularities can lead to the wavy fringes in the low frequency SAR interferograms, which disturb the actual information of geophysical processes and thus put severe limitations on ground deformations measurements. In this paper, an application of two common methods, the range split-spectrum and azimuth offset methods are exploited to estimate the contributions of the ionosphere, with the aim to correct ionospheric effects in interferograms. Based on the theoretical analysis and experiment, a performance analysis is conducted to evaluate the efficiency of these two methods. The result indicates that both methods can mitigate the ionospheric effect in SAR interferograms and the range split-spectrum method is more precise than the other one. However, it is also found that the range split-spectrum is easily contaminated by the noise, and the achievable accuracy of the azimuth offset method is limited by the ambiguous integral constant, especially with the strong azimuth variations induced by the ionosphere disturbance.

scholarly journals Distributed Fiber Optic Strain Sensing for Geomechanical Monitoring: Insights from Field Measurements of Ground Surface Deformation

Geosciences ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 285
Author(s):  
Rasha Amer ◽  
Ziqiu Xue ◽  
Tsutomu Hashimoto ◽  
Takeya Nagata
Keyword(s):  
Oil And Gas ◽  
Fiber Optic ◽  
Surface Deformation ◽  
Co2 Storage ◽  
Ground Surface ◽  
Field Tests ◽  
Deformation Monitoring ◽  
Water Tank ◽  
Strain Sensing ◽  
Geomechanical Monitoring

In recent years, distributed fiber optic strain sensing (DFOSS) technology has demonstrated a solution for continuous deformation monitoring from subsurface to surface along the wellbore. In this study, we installed a single-mode optical fiber cable in a shallow trench to establish an effective technique for ground surface deformation mapping. We conducted three experimental field tests (iron plate load, water tank filling up load, and airbag inflation) in order to confirm the strain sensitivity of DFOSS for static loads, dynamic overload, excavation, subsidence, and uplift. This paper also presents two installation methods to couple the fiber cable with the ground under various environmental conditions; here, the fiber cable was installed in a shallow trench with one part buried in the soil and another part covered with cement. Our results suggest that covering the cable with cement is a practical approach for installing a fiber cable for ground surface deformation monitoring. By combining this approach with wellbore DFOSS, accurate surface–subsurface deformation measurements can be obtained for three-dimensional geomechanical monitoring of CO2 storage and oil and gas fields in the future.

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