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Gupta, Sandeep
- Digital Seismic Network:To Map Himalayan Orogen and Seismic Hazard
Abstract Views :274 |
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
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Current Science, Vol 116, No 4 (2019), Pagination: 518-519Abstract
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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- Effective Elastic Thickness of the Continental Lithosphere with Particular Reference to the India–Eurasia Collision System
Abstract Views :43 |
PDF Views:40
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Current Science, Vol 125, No 7 (2023), Pagination: 748-757Abstract
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.Full Text
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