Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-value
A magnitude MW7.8 earthquake occurred on 25 April 2015 (referred as Gorkha earthquake). We have analyzed the spatial variation of b-value and two-dimensional strain within Nepal Himalaya before and after the Gorkha earthquake. We have used continuous Global Navigation Satellite System (GNSS) data fr...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2022-05-01
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| Series: | Geodesy and Geodynamics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674984722000155 |
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| author | Sravanthi Gunti Priyom Roy J. Narendran Ramesh Pudi S. Muralikrishnan K. Vinod Kumar M. Subrahmanyam Y. Israel B. Satish Kumar |
| author_facet | Sravanthi Gunti Priyom Roy J. Narendran Ramesh Pudi S. Muralikrishnan K. Vinod Kumar M. Subrahmanyam Y. Israel B. Satish Kumar |
| author_sort | Sravanthi Gunti |
| collection | DOAJ |
| description | A magnitude MW7.8 earthquake occurred on 25 April 2015 (referred as Gorkha earthquake). We have analyzed the spatial variation of b-value and two-dimensional strain within Nepal Himalaya before and after the Gorkha earthquake. We have used continuous Global Navigation Satellite System (GNSS) data from 30 stations in the Nepal region for geodetic strain estimation and earthquake data for b-value estimation. The GNSS data were processed using double differencing technique for the accurate position of each station. The precise velocity vectors show a general azimuth of north east for all the stations and have been used to derive two-dimensional strain. Between epicenters of Gorkha (25 April 2015) and Dolakha earthquakes (12 May 2015), we observed high co-seismic horizontal displacements (0.2 m to 2 m). In the Pre-seismic deformation study, maximum strain accumulation (56.40 × 10−9) and low b-value (0.79–0.89) was observed in and around the Western Nepal region, which may be responsible for the 2015 Gorkha earthquake. The potential seismic zones were identified by GIS based integration of geodetic strain and b-value map and superimposition using weighted overlay method. The Maximum strain and low b-value are now observed in the eastern part of Nepal. Hence, the spatial disposition of elastic energy has changed after the two major earthquakes and continuous seismic hazard assessment is required in the eastern Nepal. |
| first_indexed | 2024-12-12T21:12:34Z |
| format | Article |
| id | doaj.art-aca4373db887492c9611580e155bdd7a |
| institution | Directory Open Access Journal |
| issn | 1674-9847 |
| language | English |
| last_indexed | 2024-12-12T21:12:34Z |
| publishDate | 2022-05-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Geodesy and Geodynamics |
| spelling | doaj.art-aca4373db887492c9611580e155bdd7a2022-12-22T00:11:51ZengKeAi Communications Co., Ltd.Geodesy and Geodynamics1674-98472022-05-01133288300Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-valueSravanthi Gunti0Priyom Roy1J. Narendran2Ramesh Pudi3S. Muralikrishnan4K. Vinod Kumar5M. Subrahmanyam6Y. Israel7B. Satish Kumar8National Remote Sensing Centre, Indian Space Research Organization (ISRO), Balanagar, Hyderabad, 500037, India; Corresponding author.National Remote Sensing Centre, Indian Space Research Organization (ISRO), Balanagar, Hyderabad, 500037, IndiaNational Remote Sensing Centre, Indian Space Research Organization (ISRO), Balanagar, Hyderabad, 500037, IndiaSustainability, Risk Management Solutions of India, Noida, 201301, IndiaNational Remote Sensing Centre, Indian Space Research Organization (ISRO), Balanagar, Hyderabad, 500037, IndiaNational Remote Sensing Centre, Indian Space Research Organization (ISRO), Balanagar, Hyderabad, 500037, IndiaDepartment of Geophysics, Andhra University, Visakhapatnam, 530003, IndiaDepartment of Geophysics, Andhra University, Visakhapatnam, 530003, IndiaNational Remote Sensing Centre, Indian Space Research Organization (ISRO), Balanagar, Hyderabad, 500037, IndiaA magnitude MW7.8 earthquake occurred on 25 April 2015 (referred as Gorkha earthquake). We have analyzed the spatial variation of b-value and two-dimensional strain within Nepal Himalaya before and after the Gorkha earthquake. We have used continuous Global Navigation Satellite System (GNSS) data from 30 stations in the Nepal region for geodetic strain estimation and earthquake data for b-value estimation. The GNSS data were processed using double differencing technique for the accurate position of each station. The precise velocity vectors show a general azimuth of north east for all the stations and have been used to derive two-dimensional strain. Between epicenters of Gorkha (25 April 2015) and Dolakha earthquakes (12 May 2015), we observed high co-seismic horizontal displacements (0.2 m to 2 m). In the Pre-seismic deformation study, maximum strain accumulation (56.40 × 10−9) and low b-value (0.79–0.89) was observed in and around the Western Nepal region, which may be responsible for the 2015 Gorkha earthquake. The potential seismic zones were identified by GIS based integration of geodetic strain and b-value map and superimposition using weighted overlay method. The Maximum strain and low b-value are now observed in the eastern part of Nepal. Hence, the spatial disposition of elastic energy has changed after the two major earthquakes and continuous seismic hazard assessment is required in the eastern Nepal.http://www.sciencedirect.com/science/article/pii/S1674984722000155HimalayaCo-seismic offsetsBernese 5.2UNAVCOGrid_Strain |
| spellingShingle | Sravanthi Gunti Priyom Roy J. Narendran Ramesh Pudi S. Muralikrishnan K. Vinod Kumar M. Subrahmanyam Y. Israel B. Satish Kumar Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-value Geodesy and Geodynamics Himalaya Co-seismic offsets Bernese 5.2 UNAVCO Grid_Strain |
| title | Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-value |
| title_full | Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-value |
| title_fullStr | Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-value |
| title_full_unstemmed | Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-value |
| title_short | Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake: Insights from the GNSS data analysis and b-value |
| title_sort | assessment of geodetic strain and stress variations in nepal due to 25 april 2015 gorkha earthquake insights from the gnss data analysis and b value |
| topic | Himalaya Co-seismic offsets Bernese 5.2 UNAVCO Grid_Strain |
| url | http://www.sciencedirect.com/science/article/pii/S1674984722000155 |
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