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Determination of ground displacement of 25 April 2015 Nepal earthquake by GNSS precise point positioning
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Determination of ground displacement of 25 April 2015 Nepal earthquake by GNSS precise point positioning
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The processing results show that the common displacement direction is close to south-southwest with the largest value being approximately 2 m and the affected area being about 160 km in the southeast direction centered around the earthquake epicenter. However, a detectable GNSS signal was still observed at a station some 647 km away from the epicenter. | Vietnam Journal of Earth Sciences, 40(1), 17-25, Doi: 10.15625/0866-7187/40/1/10876 Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) http://www.vjs.ac.vn/index.php/jse Determination of ground displacement of 25 April 2015 Nepal earthquake by GNSS precise point positioning Nguyen Ngoc Lau Ho Chi Minh City University of Technology, Vietnam Received 5 May 2017; Received in revised form 26 October 2017; Accepted 10 November 2017 ABSTRACT The April 2015 Nepal earthquake (known as the Gorkha earthquake) occurred at 06:11:25 (UTC) on the 25th of April, with a magnitude of 7.8Mw. It was the worst natural disaster to strike Nepal since the 1934 Nepal-Bihar earthquake. Precise determination of ground displacement in this area will provide important information to better understand the structure and scope of the earthquake, contributing to faster and more accurate earthquake prediction. In this paper, we use precise point positioning to determine the displacements of 17 GNSS stations around the epicenter for the day of the earthquake. The processing results show that the common displacement direction is close to southsouthwest with the largest value being approximately 2 m and the affected area being about 160 km in the southeast direction centered around the earthquake epicenter. However, a detectable GNSS signal was still observed at a station some 647 km away from the epicenter. Keywords: April 2015 Nepal earthquake; GNSS; PPP. ©2018 Vietnam Academy of Science and Technology 1. Introduction1 The Gorkha earthquake killed more than 9,000 people and injured more than 23,000. It occurred at 06:11:25 (UTC) on 25 April 2015, with a magnitude of 7.8Mw or 8.1Ms and a maximum Mercalli Intensity of IX. Its epicenter locates at the east of the district of Lamjung, latitude 28.231°N, longitude 84.731°E and at a depth of approximately 8.2 km. It was the worst natural disaster to strike Nepal since the 1934 Nepal-Bihar earthquake. According to the .
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