Informatics Publishing Limited

Aneesh A. Lotliker ¹, T. Srinivasa Kumar ¹, Venkat Shesu Reddem ¹, Shailesh Nayak ²

Affiliations
1 Indian National Centre for Ocean Information Services, Ocean Valley, Pragathi Nagar (BO), Nizampet (SO), Hyderabad 500 090, IN
2 Earth System Science Organization (ESSO), 'Prithvi Bhavan', Lodhi Road, New Delhi 110 003, IN

Abstract

No Abstract.

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H. Shiva Kumar ¹, Satej Panditrao ¹, S. K. Baliarsingh ¹, Prakash Mohanty ¹, R. S. Mahendra ¹, Aneesh A. Lotliker ¹, T. Srinivasa Kumar ¹

Affiliations
1 Indian National Centre for Ocean Information Services, Hyderabad 500 090, IN

Abstract

No Abstract.

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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

Abstract

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 M_w(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.

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S. K. Baliarsingh ¹, Chandanlal Parida ², Aneesh A. Lotliker ¹, Suchismita Srichandan ², K. C. Sahu ², T. Srinivasa Kumar ¹

Affiliations
1 Indian National Centre for Ocean Information Services, Hyderabad 500 090, IN
2 Department of Marine Sciences, Berhampur University, Bhanjabihar 760 007, IN

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No Abstract.

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S. K. Baliarsingh ¹, Suchismita Srichandan ¹, Aneesh A. Lotliker ¹, M. F. Gracia-Escobar ², K. C. Sahu ³, T. Srinivasa Kumar ¹

Affiliations
1 Indian National Centre for Ocean Information Services, Hyderabad-500 090, IN
2 3Facultad de Ciencias Marinas, Universidad Autonoma de Baja California, Ensenada, MX
3 Department of Marine Sciences, Berhampur University, Bhanjabihar-760 007, IN

Abstract

Physical forcing of cyclonic phenomenon on water quality often exerts stress on marine and estuarine ecosystems due to their unpredictability. The post-cyclonic changes in phytoplankton biomass have been reported in the Bay of Bengal. In addition, cyclones also intensify physical processes resulting in entrainment of nutrient-rich water from deeper depths into surface leading to regional phytoplankton blooms.

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