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Gahalaut, V. K.
- 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.Full Text
References
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- Source of Unusual Monochromatic Wave Packets Recorded Globally in the Seismograms of 11 November 2018
Abstract Views :236 |
PDF Views:78
Authors
S. N. Bhattacharya
1,
V. K. Gahalaut
1,
Narendra Pandey
1,
Shankar Pal
1,
Rajeev Manhas
1,
G. Suresh
1
Affiliations
1 National Center for Seismology, New Delhi 110 003, IN
1 National Center for Seismology, New Delhi 110 003, IN
Source
Current Science, Vol 118, No 7 (2020), Pagination: 1069-1076Abstract
On 11 November 2018, all global seismic stations recorded unusual long-period wave packets without any discernible body waves. Our analyses show that the wave packets are monochromatic with period 15.6 sec and are fundamental-mode non-dispersive Rayleigh waves. Using the arrival times of wave packets, the source is approximately located at the northeastern edge of the recent earthquake swarm zone, off the east coast of Mayotte, a volcanic island between North Madagascar and East Africa. Synthetic seismograms for an isotropic source at 15 km depth with a transient oscillation of the same periodas that observed in the wave packets, are consistent with the recorded seismograms. We estimate an equivalent magnitude (Mw) of ~4.8 for this source and suggest that a volcanic fluid sphere of radius ~5 km might have generated such radial oscillations. Interestingly, similar monochromatic waves with lesser amplitude were also recorded on many occasions from the same source during 21 June 2018 to 10 September 2019. The period of waves increased from 15.2 sec in June to 15.6 sec in October– November 2018 and then decreased to 15.0 sec in September 2019, which implies an increase and then decrease in radius of the fluid sphere at the source.Keywords
Monochromatic Wave Packets, Seismograms, Seismic Stations, Source Characterization.Full Text
References
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- The 22 June 2020 Mizoram, India earthquake (Mw 5.5): an unusual intra-wedge shallow earthquake in the Indo-Burmese Wedge
Abstract Views :182 |
PDF Views:84
Authors
J. Malsawma
1,
Paul Lalnuntluanga
1,
Saitluanga Sailo
2,
V. Vanthangliana
2,
R. P. Tiwari
3,
V. K. Gahalaut
4
Affiliations
1 Department of Geology, Mizoram University, Tanhril, Aizawl 796 004, IN
2 Pachhunga University College, Mizoram University, Aizawl 796 001, IN
3 Department of Geology, Mizoram University, Tanhril, Aizawl 796 004, India; Central University of Punjab, Bathinda 151 401, IN
4 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 Department of Geology, Mizoram University, Tanhril, Aizawl 796 004, IN
2 Pachhunga University College, Mizoram University, Aizawl 796 001, IN
3 Department of Geology, Mizoram University, Tanhril, Aizawl 796 004, India; Central University of Punjab, Bathinda 151 401, IN
4 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 120, No 9 (2021), Pagination: 1514-1516Abstract
Earthquakes in the Indo-Burmese arc occur due to interaction of India and Sunda plates along the IndoBurmese Wedge and Sagaing Fault. Majority of the moderate to major magnitude earthquakes in the Indo-Burmese Wedge occur within the Indian slab and very few of them occur on the plate interface. Earthquakes within the wedge are rare and the 22 June 2020 earthquake of magnitude 5.5 (Mw) on the India–Myanmar border in Mizoram, India, at shallow depth is probably one such earthquake. The earthquake caused moderate damage (maximum intensity VIII on MSK scale) in remote border villages (Vaphai and Chawngtui) with sparse population without any fatality. The earthquake did not seem to be related with the Mat Fault, which was transverse to the north–south trending wedge, as various estimates of mainshock and the region of maximum damage was ~20 km northeast of the surface trace of the Mat Fault. It appeared to be associated with almost north– south oriented Churachandpur Mao Fault (CMF) with dextral slip which mapped extensively and monitored geodetically in the neighbouring regions of Manipur and Nagaland to the north. Occurrence of this shallow depth earthquake may imply that some segment of the CMF might be seismically active, unlike in the north, where it appears to be predominantly aseismic. This implies that the seismic hazard along the CMF may vary along its length.Keywords
Churachandpur Mao Fault, earthquakes, Indo-Burmese arc, tectonics.Full Text
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