Estimating deformation due to soil liquefaction in Urayasu city, Japan using permanent scatterers

ElGharbawi, Tamer; Tamura, Masayuki

doi:10.1016/j.isprsjprs.2015.09.002

Cited by 8 publications

(11 citation statements)

References 26 publications

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“…These local surface displacements were associated with likely groundwater level changes at several locations on the plain. It has been reported that soil liquefaction occurred extensively in artificial filled areas along the Tokyo bay, which are ~20-50 km away from the local uplift area in this study (Bhattacharya et al 2011;Ishitsuka et al 2012;ElGharbawi and Tamura 2015b). Soil liquefaction is the compaction of soil grains from continuous vibration.…”

Section: Possible Mechanisms Of Local Surface Upliftmentioning

confidence: 70%

Ground uplift related to permeability enhancement following the 2011 Tohoku earthquake in the Kanto Plain, Japan

Ishitsuka

Matsuoka

Nishimura

et al. 2017

Earth Planets Space

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We investigated the post-seismic surface displacement of the 2011 Tohoku earthquake around the Kanto Plain (including the capital area of Japan), which is located approximately 400 km from the epicenter, using a global positioning system network during 2005-2015 and persistent scatterer interferometry of TerraSAR-X data from March 2011 to November 2012. Uniform uplift owing to viscoelastic relaxation and afterslip on the plain has been reported previously. In addition to the general trend, we identified areas where the surface displacement velocity was faster than the surrounding areas, as much as ~7 mm/year for 3 years after the earthquake and with a velocity decay over time. Local uplift areas were ~30 × 50 km 2 and showed a complex spatial distribution with an irregular shape. Based on an observed groundwater level increase, we deduce that the local ground uplift was induced by a permeability enhancement and a pore pressure increase in the aquifer system, which is attributable to mainshock vibration.

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Section: Possible Mechanisms Of Local Surface Upliftmentioning

confidence: 70%

Ground uplift related to permeability enhancement following the 2011 Tohoku earthquake in the Kanto Plain, Japan

Ishitsuka

Matsuoka

Nishimura

et al. 2017

Earth Planets Space

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“…ElGharbawi and Tamura [35] reported that a tilted building could be a signature of a local deformation. Assuming that all buildings in the northern urban area of Guanmiao district tilted only 0.5 • toward the west direction, this would make a house 10 m in height (approximately three floors) move 87 mm in a westerly direction.…”

Section: Surface Deformation In Guanmiao Districtmentioning

confidence: 99%

“…The analysis of coherence variation has been successfully applied in many fields of Earth sciences, including volcanology, landslide hazard and earthquake hazard [28][29][30]. Among the earthquake hazards, the decorrelation characteristic is useful for detecting the surface deformation and cracks [30,31], distinguishing the collapsed and damaged buildings [31,32] and mapping the ranges of soil liquefaction [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Coherence Difference Analysis of Sentinel-1 SAR Interferogram to Identify Earthquake-Induced Disasters in Urban Areas

Chang

et al. 2018

Remote Sensing

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This study proposes a workflow that enables the accurate identification of earthquake-induced damage zones by using coherence image pairs of the Sentinel-1 satellite before and after an earthquake event. The workflow uses interferometric synthetic aperture radar (InSAR) processing to account for coherence variations between coseismic and preseismic image pairs. The coherence difference between two image pairs is useful information to detect specific disasters in a regional-scale area after an earthquake event. To remove background effects such as the atmospheric effect and ordinal surface changes, this study employs the two-step threshold method to develop the coseismic coherence difference (CCD) map for our analyses. Thirty-four Sentinel-1 images between January 2015 and February 2016 were collected to process 30 preseismic image pairs and two coseismic image pairs for assessing multiple types of disasters in Tainan City of southwestern Taiwan, where severe damages were observed after the Meinong earthquake event. The coseismic unwrapping phases were further calculated to estimate the surface displacement in east-west and vertical directions. Results in the CCD map agree well with the observations from post-earthquake field surveys. The workflow can accurately identify earthquake-induced land subsidence and surface displacements, even for areas with insufficient geological data or for areas that had been excluded from the liquefaction potential map. In addition, the CCD details the distribution of building damages and structure failures, which might be useful information for emergency actions applied to regional-scale problems. The conversion of 2D surface displacement reveals the complex behavior of geological activities during the earthquake. In the foothill area of Tainan City, the opposite surface displacements in local areas might be influenced by the axis activities of the Kuanmiao syncline.

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“…Due to the challenges of field observation immediately after the event, remote sensing has become an effective technique for reliable disaster assessment and post-earthquake emergency response [3][4][5]. With the rapid development of the technology, remote sensing has played an increasingly important role in disaster assessment, rescue and relief, as well as recovery and reconstruction, due to its advantages, such as improved safety, rapid and comprehensive data collection, macroscopic and large coverage and freedom from the restrictions of ground natural conditions [6][7][8]. It is extremely important to obtain highquality data sources in time for earthquake damage monitoring and emergency rescue by means of remote sensing [9,10].…”

Section: Introductionmentioning

confidence: 99%

Using InSAR and PolSAR to Assess Ground Displacement and Building Damage after a Seismic Event: Case Study of the 2021 Baicheng Earthquake

et al. 2022

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During unexpected earthquake catastrophes, timely identification of damaged areas is critical for disaster management. On the 24 March 2021, Baicheng county was afflicted by a Mw 5.3 earthquake. The disaster resulted in three deaths and many human injuries. As an active remote sensing technology independent of light and weather, the increasingly accessible Synthetic Aperture Radar (SAR) is an attractive data for assessing building damage. This paper aims to use Sentinel-1A radar images to rapidly assess seismic damage in the early phases after the disaster. A simple and robust method is used to complete the task of surface displacement analysis and building disaster monitoring. In order to obtain the coseismic deformation field, differential interferometry, filtering and phase unwrapping are performed on images before and after the earthquake. In order to detect the damage area of buildings, the Interferometric Synthetic Aperture Radar (InSAR) and Polarimetric Synthetic Aperture Radar (PolSAR) techniques are used. A simple and fast method combining coherent change detection and polarimetric decomposition is proposed, and the complete workflow is introduced in detail. In our experiment, we compare the detection results with the ground survey data using an unmanned aerial vehicle (UAV) after the earthquake to verify the performance of the proposed method. The results indicate that the experiment can accurately obtain the coseismic deformation field and identify the damaged and undamaged areas of the buildings. The correct identification accuracy of collapsed and severely damaged areas is 86%, and that of slightly damaged and undamaged areas is 84%. Therefore, the proposed method is extremely effective in monitoring seismic-affected areas and immediately assessing post-earthquake building damage. It provides a considerable prospect for the application of SAR technology.

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Estimating deformation due to soil liquefaction in Urayasu city, Japan using permanent scatterers

Cited by 8 publications

References 26 publications

Ground uplift related to permeability enhancement following the 2011 Tohoku earthquake in the Kanto Plain, Japan

Ground uplift related to permeability enhancement following the 2011 Tohoku earthquake in the Kanto Plain, Japan

Coherence Difference Analysis of Sentinel-1 SAR Interferogram to Identify Earthquake-Induced Disasters in Urban Areas

Using InSAR and PolSAR to Assess Ground Displacement and Building Damage after a Seismic Event: Case Study of the 2021 Baicheng Earthquake

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