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Mandal, Prantik

Singhbhum Craton

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

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.

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

Abstract Views :280 | 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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Estimation of Source Parameters of Local Earthquakes Based on Inversion of Waveform Data

Abstract Views :212 | PDF Views:80

Authors

Prosanta K. Khan ¹, Kuntal Bhukta ², Prantik Mandal ³

Affiliations
1 Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
2 Geological Survey of India, Khanij Bhavan, GSI Complex, 15–16 Jhalana Dungri, Jaipur 302 004, IN
3 National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN

Source

Current Science, Vol 119, No 7 (2020), Pagination: 1159-1168

Abstract

Generalized inversion has been used to estimate the various source parameters using S-wave spectra of 17 local crustal earthquakes recorded at the Dhanbad broadband seismic station, Jharkhand, India. Source parameters of another nine local events were compiled from an earlier study for detailed analysis. It was found from the source parameters of 26 events, that the corner frequency lies between 4.56 and 8.62 Hz, seismic moment between 6.2E + 12 and 2.11E + 16 N-m, stress drop between 0.11 and 37.13 MPa, source radius between 144 and 291 m, source displacement between 0.24 and 229 cm, moment magnitude between 2.44 and 4.82, and seismic energy between 8.3E + 06 and 1.13E + 13 Joule. Various empirical relationships were established based on the results of these 26 events, and it was found that the stress drop, corner frequency, source radius and source displacement are inter-related. Analysis also showed that the source parameters were correlated for stress-drop intervals of Δσ > 3.0 MPa and Δσ < 3.0 MPa, and were interpreted to be caused by interrupted rupture propagation because of strain weakening of the rock masses. The mere correlation between focal depth and stress drop found in the present study apparently accounts for high heterogeneities present in the crust beneath the study area.

Keywords

Generalized Inversion, Local Earthquakes, Source Parameters, Waveform Data.

Full Text

References

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