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Ajay Kumar, B.
- The Admissible Tsunamigenic Source Region of 24 September 2013 Land-Based Earthquake - Application of Backward Ray Tracing Technique
Abstract Views :215 |
PDF Views:85
Authors
Ch. Patanjali Kumar
1,
B. Ajay Kumar
1,
E. Uma Devi
1,
R. S. Mahendra
1,
M. V. Sunanda
1,
M. Pradeep Kumar
1,
J. Padmanabham
1,
S. Dipankar
1,
T. Srinivasa Kumar
1
Affiliations
1 Indian National Centre for Ocean Information Services (INCOIS), Hyderabad 500 090, IN
1 Indian National Centre for Ocean Information Services (INCOIS), Hyderabad 500 090, IN
Source
Current Science, Vol 108, No 9 (2015), Pagination: 1712-1716Abstract
A minor tsunami of about 50 cm was generated along the coast of Qurayat near Makran subduction zone in the Arabian Sea due to the 24 September 2013 Pakistan earthquake of magnitude 7.6 Mw(mB), although its source was ∼200 km far inland of the Makran trench. The real-time sea-level observation network in the Arabian Sea recorded minor tsunami arrivals. In an attempt to explain the mechanism of this unusual tsunami, we use backward ray tracing technique to map the admissible region of tsunamigenic source. Basically, in this technique the ray equations are integrated starting from the specific locations of tsunami observations, in all possible directions. The known travel time of the initial waves to the respective tide gauges and tsunami buoys is used in this method. Backward wave front is constructed by joining all end-points of the rays from each of the locations. The region where the envelope of all backward wave fronts converges is considered as the source of the tsunami, which is ∼470 km from the earthquake epicentre with the location at 24.8 N and 61.5 E. The admissible region identified is an undersea section between Chabahar and Gwadar, where a mud island had appeared subsequent to this earthquake. Convergence of the tsunami source zone and location of the mud island suggest that the sudden uplift must have caused the tsunami.Keywords
Backward Ray Tracing, Earthquake, Tsunami, Subduction Zone.Full Text
- Are we Ready for a Major Tsunami in the Indian Ocean?
Abstract Views :232 |
PDF Views:80
Authors
S. S. C. Shenoi
1,
P. L. N. Murty
1,
Ch. Patanjali Kumar
1,
B. Ajay Kumar
1,
M. V. Sunanda
1,
K. Siva Srinivas
1,
J. Padmanabham
1,
Dipankar Saikia
1,
E. Pattabhi Rama Rao
1,
Shailesh Nayak
1
Affiliations
1 Indian National Centre for Ocean Information and Services (INCOIS), Ministry of Earth Sciences, Hyderabad 500 090, IN
1 Indian National Centre for Ocean Information and Services (INCOIS), Ministry of Earth Sciences, Hyderabad 500 090, IN
Source
Current Science, Vol 118, No 11 (2020), Pagination: 1753-1759Abstract
The Indian Tsunami Early Warning System (ITEWS) was established at the Indian National Centre for Ocean Information Services, Hyderabad in October 2007 following the devastating tsunami on 26 December 2004. The Intergovernmental Oceanographic Commission of United Nations Educational, Scientific and Cultural Organization (IOC/UNESCO) coordinated with the National Tsunami Warning Centers in the Indian Ocean region and promoted the establishment of a well-knit tsunami early warning system called Indian Ocean Tsunami Warning and Mitigation System (IOTWMS) so that all countries on the Indian Ocean can get benefitted. The end-to-end capabilities of this warning system have been well-proven during the tsunamigenic earthquakes that occurred since September 2007. The capability of the system is examined, with special reference to Indian Tsunami Early Warning System (ITEWS), to ascertain the readiness of the Indian Ocean region to face a major tsunami.Keywords
Advisories, Capacity Building, Inundation, Modelling, Tsunami.Full Text
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