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Tiwari, V. M.

Digital Seismic Network:To Map Himalayan Orogen and Seismic Hazard

Abstract Views :273 | PDF Views:73

Authors

D. Srinagesh ¹, Prantik Mandal ¹, R. Vijaya Raghavan ¹, Sandeep Gupta ¹, G. Suresh ¹, D. Srinivas ¹, Satish Saha ¹, M. Sekhar ¹, K. Sivaram ¹, Sudesh Kumar ¹, P. Solomon Raju ¹, A. N. S. Sarma ¹, Y. V. V. S. B. Murthy ¹, N. K. Borah ¹, B. Naresh ¹, B. N. V. Prasad ¹, V. M. Tiwari ¹

Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN

Source

Current Science, Vol 116, No 4 (2019), Pagination: 518-519

Abstract

According to the Gutenberg–Richter law¹, at least one earthquake of magnitude greater than 7 occurs every month along the seismically active belts in the world. Earthquakes are the manifestation of fault slip at depths, thus, there is no direct method to measure or observe them. However, seismometers can record ground velocity or acceleration caused by the occurrence of an earthquake when a fault slip occurs at depth. Therefore, setting up a seismic network is inevitable to understand the physics of earthquake processes, thereby, mitigating earthquake hazard.

Full Text

References

Gutenberg, B. and Richter, C. F., Ann. Geofis., 1956, 9, 1–15.

Ambraseys, N. N. and Jackson, D., Curr. Sci., 2003, 84, 570–582.

Gupta, H. and Gahalaut, V. K., Gondwana Res., 2014, 25, 204–213.

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Bilham, R., Nature Geosci., 2015, 8, 582– 584.

Precambrian Geodynamics

An Appraisal of Recent Earthquake Activity in Palghar Region, Maharashtra, India

Abstract Views :279 | PDF Views:79

Authors

D. Srinagesh ¹, Dhiraj Kumar Singh ¹, G. Vikas ¹, B. Naresh ¹, Sunil Roy ¹, Y. V. V. B. S. N. Murthy ¹, P. Solomon Raju ¹, G. Suresh ¹, Prantik Mandal ¹, A. N. S. Sharma ¹, M. Shekar ¹, V. M. Tiwari ¹

Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN

Source

Current Science, Vol 118, No 10 (2020), Pagination: 1592-1598

Abstract

The present study focuses on the recent earthquake activity in Palghar region, Maharashtra, India. Until 31 August 2019, a total of 4854 earthquakes have been located here, whose local magnitude (M_L) varied from 0.1 to 4.1. Majority of the earthquakes (~94%) were located in the depth range 4–16 km. The precise earthquake relocations reveal two clusters. The N–S trending cluster north of 20.04°N extends to a depth of 10 km, whereas the NE–SW trending cluster to the south of 20.04°N extends to 16 km depth. The shallow northern cluster is noticed to be sandwiched between two mapped mafic intrusions, whereas the deeper southern segment shows earthquakes clustering around the mafic intrusion. The modelled composite focal mechanism solutions for both the north and south clusters suggest normal faulting with a minor strike–slip component as the dominant deformation mode for the Palghar region. From relocated seismici-ty, we have detected a deeper seismically active zone (with M> 3) at 4–16 km depth, occupying a crustal volume of 1440 km 3 (i.e. 20 km (in N–S) ×6 km (in E– W) and 12 km (in depth)) that dips toward 20°S and 70°W. This could be attributed to the large crustal stresses induced by the mafic intrusive body below the region.

Keywords

Crustal Stress, Deformation Mode, Earth-quake, Mafic Intrusion, Relocations, Seismic Activity.

Full Text

References

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Drone-Borne Magnetic Measurements in India

Effective Elastic Thickness of the Continental Lithosphere with Particular Reference to the India–Eurasia Collision System

Abstract Views :43 | PDF Views:40

Authors

V. H. Arjun ¹, V. M. Tiwari ¹, Sandeep Gupta ¹

Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN

Source

Current Science, Vol 125, No 7 (2023), Pagination: 748-757

Abstract

The effective elastic thickness (EET) of the lithosphere is a measure of the lithosphere’s ability to flex under long-term geological and topographic loads. It is often estimated through analyses of gravity and topographic data. The EET has a significant role in regulating the geodynamic evolution of both the continental and oceanic plates. Estimates of EET derived from geophysical data are consistent with rheological models in the oceanic regions. However, there are extensive debates on the estimates of EET and rheological models over the continental areas; differences are probably due to the complex structure and history of the continental plates. For instance, according to one model of continental rheology, popularly known as the ‘Jelly Sandwich’, the mechanical strength of the lithospheric plate is distributed in the upper crust and the lithospheric mantle. In another model, dubbed as ‘Crème Brulee’, the lithospheric mantle is weak, and the mechanical strength of the lithosphere is limited to the upper portion of the crust. These model differences have arisen because of inconsistent results obtained using different datasets, e.g. the distribution of earthquakes, EET, gravity anomaly and rheology. This article discusses the evolution of these contrasting models and the critical necessity to resolve the model differences.

Keywords

Continental Rheology, Effective Elastic Thickness, Flexural Modelling, Isostasy, Lithosphere.

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