Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015

Once again Nepal was shocked by another earthquake with magnitude 7.8 Mw known as Gorkha Earthquake on April 25, 2015, after 81 years of the worst natural disaster that struck in 1934. Continued aftershocks occurred throughout Nepal within 15–20 minutes intervals, with one shock reaching a magnitude...

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Main Authors: Mohamad Radhi, Anis Afirah, Sarker, Md. Latifur Rahman, Ishak, Nasuha
Format: Conference or Workshop Item
Published: 2015
Subjects:
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author Mohamad Radhi, Anis Afirah
Sarker, Md. Latifur Rahman
Ishak, Nasuha
author_facet Mohamad Radhi, Anis Afirah
Sarker, Md. Latifur Rahman
Ishak, Nasuha
author_sort Mohamad Radhi, Anis Afirah
collection ePrints
description Once again Nepal was shocked by another earthquake with magnitude 7.8 Mw known as Gorkha Earthquake on April 25, 2015, after 81 years of the worst natural disaster that struck in 1934. Continued aftershocks occurred throughout Nepal within 15–20 minutes intervals, with one shock reaching a magnitude of 6.7 Mw on April 26, 2015. A major aftershock occurred on 12 May 2015, with 7.3 Mw. Geophysicists and other experts are warning for decades that Nepal is vulnerable to a deadly earthquake, particularly because of its geology as Nepal lies towards the southern limit of the diffuse collisional boundary where the Indian Plate under thrusts the Eurasian Plate, occupying the central sector of the Himalayan arc, nearly one-third of the 2,400 km (1,500 mi) long the Himalayas. Estimation of damaged especially surface deformation is an important part of the rebuilding planning process for natural disaster. Although field investigation is one of the best means for determination of surface deformation, this process is unable to explore a large area, especially in remote and inaccessible area. Remote Sensing technique, especially interferometric synthetic aperture radar (InSAR) is invaluable technique for assessment of surface deformation due to the natural disasters particularly earthquake. InSAR has the potential to provide important subsidence information over large areas because of its two-dimensional spatial coverage, competitive cost, data availability, and high vertical accuracy for remotely measuring the deformation of the ground and man-made structures from space. This technique can even achieve millimeter level accuracy using a technique called differential InSAR technique (DInSAR). However, the accuracy of this process depends on several factors such as availability of satellite data with optimal temporal and perpendicular baseline along with necessary ancillary data especially a high-resolution DEM (Digital Elevation Model). Therefore, this study is going to estimate the surface deformation in Nepal due to the Gorkha Earthquake using data from new L-band SAR sensor ALOS/PALSAR-2 which has been significantly improved in all aspects including resolution, observation band, and time lag compared to ALOS/PALSAR. Fine beam dual polarization (HH and HV) with 10 m resolution data that cover the earthquake areas were used to measure the surface deformation using the DInSAR technique. Results indicate that there was a large displacement of land surface due to the massive Gorkha Earthquake and subsequent aftershocks. However, the level of subsidence was varied from one place to another place probably due to the geological structure of the affected areas although most of the deformation was observed around the epicenters of the earthquake.
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spelling utm.eprints-620322017-08-08T00:58:55Z http://eprints.utm.my/62032/ Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015 Mohamad Radhi, Anis Afirah Sarker, Md. Latifur Rahman Ishak, Nasuha QE Geology Once again Nepal was shocked by another earthquake with magnitude 7.8 Mw known as Gorkha Earthquake on April 25, 2015, after 81 years of the worst natural disaster that struck in 1934. Continued aftershocks occurred throughout Nepal within 15–20 minutes intervals, with one shock reaching a magnitude of 6.7 Mw on April 26, 2015. A major aftershock occurred on 12 May 2015, with 7.3 Mw. Geophysicists and other experts are warning for decades that Nepal is vulnerable to a deadly earthquake, particularly because of its geology as Nepal lies towards the southern limit of the diffuse collisional boundary where the Indian Plate under thrusts the Eurasian Plate, occupying the central sector of the Himalayan arc, nearly one-third of the 2,400 km (1,500 mi) long the Himalayas. Estimation of damaged especially surface deformation is an important part of the rebuilding planning process for natural disaster. Although field investigation is one of the best means for determination of surface deformation, this process is unable to explore a large area, especially in remote and inaccessible area. Remote Sensing technique, especially interferometric synthetic aperture radar (InSAR) is invaluable technique for assessment of surface deformation due to the natural disasters particularly earthquake. InSAR has the potential to provide important subsidence information over large areas because of its two-dimensional spatial coverage, competitive cost, data availability, and high vertical accuracy for remotely measuring the deformation of the ground and man-made structures from space. This technique can even achieve millimeter level accuracy using a technique called differential InSAR technique (DInSAR). However, the accuracy of this process depends on several factors such as availability of satellite data with optimal temporal and perpendicular baseline along with necessary ancillary data especially a high-resolution DEM (Digital Elevation Model). Therefore, this study is going to estimate the surface deformation in Nepal due to the Gorkha Earthquake using data from new L-band SAR sensor ALOS/PALSAR-2 which has been significantly improved in all aspects including resolution, observation band, and time lag compared to ALOS/PALSAR. Fine beam dual polarization (HH and HV) with 10 m resolution data that cover the earthquake areas were used to measure the surface deformation using the DInSAR technique. Results indicate that there was a large displacement of land surface due to the massive Gorkha Earthquake and subsequent aftershocks. However, the level of subsidence was varied from one place to another place probably due to the geological structure of the affected areas although most of the deformation was observed around the epicenters of the earthquake. 2015 Conference or Workshop Item PeerReviewed Mohamad Radhi, Anis Afirah and Sarker, Md. Latifur Rahman and Ishak, Nasuha (2015) Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015. In: Proceedings of the 36th Asian Conference on Remote Sensing 2015, 24-28 Oct, 2015, Phillipines. https://www.acrs2015.org/the-conference/about-acrs/
spellingShingle QE Geology
Mohamad Radhi, Anis Afirah
Sarker, Md. Latifur Rahman
Ishak, Nasuha
Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015
title Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015
title_full Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015
title_fullStr Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015
title_full_unstemmed Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015
title_short Monitoring of surface deformation due to earthquake using dinsar technique and palsar-2 data: a case study of the Gorkha Earthquake in Nepal, 2015
title_sort monitoring of surface deformation due to earthquake using dinsar technique and palsar 2 data a case study of the gorkha earthquake in nepal 2015
topic QE Geology
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