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Gahalaut, Kalpna
- The 12 May 2015 Kodari Earthquake (Mw 7.3) in Central Nepal:Delayed Triggering by the 25 April 2015 Gorkha Earthquake (Mw 7.8)
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Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 Department of Earth and Atmospheric Sciences, National Institute of Technology Rourkela, Rourkela 769 008, IN
3 National Centre for Seismology, Ministry of Earth Sciences, New Delhi 110 003, IN
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 Department of Earth and Atmospheric Sciences, National Institute of Technology Rourkela, Rourkela 769 008, IN
3 National Centre for Seismology, Ministry of Earth Sciences, New Delhi 110 003, IN
Source
Current Science, Vol 114, No 07 (2018), Pagination: 1534-1539Abstract
The 12 May 2015 earthquake of Mw 7.3 occurred in the Kodari region, Central Nepal, 17 days after the 25 April 2015 Gorkha earthquake (Mw 7.8) along the Himalayan plate boundary. Both the earthquakes were associated with predominantly thrust faulting on the Main Himalayan Thrust (MHT). This is the largest aftershock of the 2015 Gorkha earthquake which occurred approximately 150 km east of it. Our analysis suggests that the 2015 Gorkha earthquake significantly increased the Coulomb stress on the shallow unruptured and updip part of the MHT, further west of the 2015 rupture and also in the hypocentre region of 12 May 2015 Mw 7.3 aftershock. In the following 17 days period, Coulomb failure stress increased further by the relaxation of coseismic pore pressure on the eastern side of its coseismic rupture, where the 12 May 2015 aftershock had occurred.Keywords
Coseismic Rupture, Delayed Triggering, Earthquakes, Failure Stress, Thrust Faulting.References
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- Bengaluru groundwater fluctuations reflected in crustal deformation
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PDF Views:15
Authors
Affiliations
1 ACSIR-Academy of Scientific and Innovative Research, Ghaziabad 201 002, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 ACSIR-Academy of Scientific and Innovative Research, Ghaziabad 201 002, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 127, No 2 (2024), Pagination: 238-239Abstract
The water crisis in Bengaluru is mainly due to a large deficit in rainfall during 2023. Less precipitation led to less recharge and subsurface storage. The recharge or subsurface loading causes elastic deformation of the crust, namely subsidence during monsoon and its recovery afterward. Such deformation can be measured using continuous GPS measurements. We see an excellent correspondence between the trends of Bengaluru rainfall over the past two decades and the vertical surface deformation derived from the continuous GPS measurements at the IISc site. Decreased precipitation in 2023 led to less annual subsidence than in the earlier four years when the rainfall increased in subsequent years from 2019 to 2022, increasing subsidence every year following the monsoon. The rainfall pattern in Hyderabad was similar to that in Bengaluru, but in terms of the magnitude of rainfall and corresponding crustal subsidence, which was estimated from the GPS measurements at the HYDE site, it was less pronounced. These two examples demonstrate the influence of the hydrological process on the crustal deformation process.Keywords
Crustal deformation, GPS, groundwater, rainfall.- Cause of Ground Subsidence in Machhlipatnam Region
Abstract Views :30 |
Authors
Shubham Rajewar
1,
Akarsh Asoka
1,
K. M. Sreejith
2,
Ritesh Agrawal
2,
N. Puviarasan
3,
K. C. Sai Krishnan
4,
Mudit Mathur
5,
Kalpna Gahalaut
1,
Vineet K. Gahalaut
1
Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, India; Academy of Scientific and Innovative Research, Ghaziabad 201 002, IN
2 ISRO-Space Applications Centre, Ahmadabad 380 015, IN
3 India Meteorological Department, RMC, Bengaluru 560 001, IN
4 India Meteorological Department, Delhi 110 003, IN
5 Indian Air Force, Delhi 110 062, IN
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, India; Academy of Scientific and Innovative Research, Ghaziabad 201 002, IN
2 ISRO-Space Applications Centre, Ahmadabad 380 015, IN
3 India Meteorological Department, RMC, Bengaluru 560 001, IN
4 India Meteorological Department, Delhi 110 003, IN
5 Indian Air Force, Delhi 110 062, IN