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Suresh, G.

Iron Oxide-Copper-Gold Mineralization at Thanewasna, Western Bastar Craton

Abstract Views :100 | PDF Views:21

Authors

M. L. Dora ¹, K. R. Randive ², H. M. Ramachandra ³, G. Suresh ⁴

Affiliations
1 Geological Survey of India, Central Region, Nagpur 440 006, IN
2 RTM Nagpur University, Nagpur 440 001, IN
3 Geological Survey of India, Bengaluru 566 070, IN
4 Geological Survey of India, Southern Region, Hyderabad 500 068, IN

Source

Current Science, Vol 112, No 05 (2017), Pagination: 1045-1050

Abstract

Iron oxide-copper-gold (IOCG) at Thanewasna, Maharashtra, India is a new genetic type of ore deposit, being reported from the western margin of Bastar craton, based on integrated field, drilling, mineral chemistry and Raman microprobe studies. It is the fourth such IOCG type being reported from India. Hydrothermal mineralization is structurally confined to en echelon dilatational quartz-chlorite veins along NW-SE trending brittle-ductile shear zone hosted in calc-alkaline granitoid. The mineralization is characterized by chalcopyrite, magnetite and barite which occur as dissemination, stringers and veins associated with hydrothermal K-alteration and chlorite alteration. Chemical analysis shows significant amounts of Cu, Fe, Ba and anomalous Au content. Ore petrography and scanning electron microscope and electron probe micro analyser studies show assemblages of Cu-Fe-Au-Ag-Ni-Ba-REE minerals typical of IOCG type deposits at Thanewasna. Ore textures, mineralogy and alteration characteristics are typical of IOCG-type deposits, further supported by mineral chemistry of magnetite (V versus Ti/V) using EPMA, and thus define a IOCG metallogenic province in Thanewasna area with significant implications for future exploration.

Keywords

Hydrothermal Mineralization, IOCG, Mineral Chemistry, Ore Deposits.

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Recent Microseismicity in Nellore District of Andhra Pradesh

Abstract Views :108 | PDF Views:18

Authors

B. Naresh ¹, P. Solomon Raju ¹, G. Suresh ¹, A. N. S. Sarma ¹, R. Vijaya Ragavan ¹, Satish Saha ¹, D. Srinagesh ¹

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

Source

Current Science, Vol 115, No 7 (2018), Pagination: 1247-1249

Abstract

The Nellore district in the Southeastern part of Andhra Pradesh is one of the nine coastal districts of the state. The microtremor activity in the district started in October 2015 and continued up to July 2016. During this period, a few hundred tremors were recorded by the temporary seismic network installed locally by the CSIR-NGRI. Apart from the data recorded by this network, those from the semipermanent seismic stations at Racherla, Addanki, Cuddapah, Srikalahasti and Srisailam were used in the study¹.

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References

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A Quiet but Deep Trouble in Tonga Subduction Zone

Digital Seismic Network:To Map Himalayan Orogen and Seismic Hazard

Abstract Views :171 | PDF Views:15

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.

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References

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Source of Unusual Monochromatic Wave Packets Recorded Globally in the Seismograms of 11 November 2018

Abstract Views :143 | PDF Views:20

Authors

S. N. Bhattacharya ¹, V. K. Gahalaut ¹, Narendra Pandey ¹, Shankar Pal ¹, Rajeev Manhas ¹, G. Suresh ¹

Affiliations
1 National Center for Seismology, New Delhi 110 003, IN

Source

Current Science, Vol 118, No 7 (2020), Pagination: 1069-1076

Abstract

On 11 November 2018, all global seismic stations recorded unusual long-period wave packets without any discernible body waves. Our analyses show that the wave packets are monochromatic with period 15.6 sec and are fundamental-mode non-dispersive Rayleigh waves. Using the arrival times of wave packets, the source is approximately located at the northeastern edge of the recent earthquake swarm zone, off the east coast of Mayotte, a volcanic island between North Madagascar and East Africa. Synthetic seismograms for an isotropic source at 15 km depth with a transient oscillation of the same periodas that observed in the wave packets, are consistent with the recorded seismograms. We estimate an equivalent magnitude (M_w) of ~4.8 for this source and suggest that a volcanic fluid sphere of radius ~5 km might have generated such radial oscillations. Interestingly, similar monochromatic waves with lesser amplitude were also recorded on many occasions from the same source during 21 June 2018 to 10 September 2019. The period of waves increased from 15.2 sec in June to 15.6 sec in October– November 2018 and then decreased to 15.0 sec in September 2019, which implies an increase and then decrease in radius of the fluid sphere at the source.

Keywords

Monochromatic Wave Packets, Seismograms, Seismic Stations, Source Characterization.

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References

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

Abstract Views :175 | PDF Views:15

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.

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References

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Vulnerability Assessment of a Heritage Structure Subjected to Blast-Induced Ground Motions

Abstract Views :127 | PDF Views:18

Authors

R. Pradeep Kumar ¹, D. Srinagesh ², T. Seshunarayana ², R. K. Chadha ², Narender Bodige ³, G. Suresh ², D. Hima Chandan ¹, C. V. R. Murty ⁴

Affiliations
1 Earthquake Engineering Research Centre, International Institute of Information Technology, Hyderabad 500 032, IN
2 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
3 Department of Civil Engineering, Anurag Group of Institutions, Hyderabad 501 301, IN
4 Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN

Source

Current Science, Vol 119, No 7 (2020), Pagination: 1131-1141

Abstract

A ground-structure vibration response study was carried out at the Ramappa Temple near Warangal, Telangana, India, shaken by underground blasting undertaken at the neighbouring Devadula Lift Irrigation Project to build water tunnels. The intensities of vibrations were examined – subsurface and ground vibrations were measured using velocity meters, and shaking at the temple using accelerometers. The study concluded that high-frequency vibrations of the ground were filtered by the soft natural clay bed underneath, and vibrations at the temple structure were small and well below the levels that can cause damage to it. Here we present the scientific findings of the vibrations recorded during the blasts and their implications.

Keywords

Heritage Structure, Structural Response, Tunnel Blasting, Vibrations, Vulnerability Assessment.

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Ground Motion Prediction Equation For Earthquakes Along The Western Himalayan Arc

Abstract Views :178 | PDF Views:19

Authors

Srinagesh ¹, S. K. Singh ², D. Arroyo ³, D. Srinivas ¹, G. Suresh ⁴, G. Suresh ¹

Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
2 Universidad Nacional Autónoma de México. Instituto de Geofísica, Circuito de la Investigación s/n, Ciudad Universitaria, Coyoacán, Mexico City 04510, MX
3 Departamento de Materiales, Universidad Autónoma Metropolitana, Avenida San Pablo 180, Reynosa Tamaulipas, Azcapotzalco, Mexico City 02200, MX
4 National Centre for Seismology, India, Mausam Bhavan Complex, Lodi Road, New Delhi 110 003, IN

Source

Current Science, Vol 120, No 6 (2021), Pagination: 1074-1082

Abstract

A critical element in seismic hazard estimation is the ground motion prediction equation (GMPE) which relates expected seismic intensity at a point from an earthquake of a given magnitude and location. Presently available GMPEs for plate interface thrust earthquakes along the Himalayan arc suffer from limited number of strong motion recordings used in their derivation. In this study we use a larger dataset, including recordings from the 2015 Gorhka, Nepal earthquake (M_w 7.9) and some of its larger aftershocks, to derive GMPE for earthquakes along the Western Himalayan arc. The proposed GMPE should give more reliable estimation of ground motion parameters at hard sites along the arc and in Peninsular India, and at soft sites in the Indo-Gangetic Plains.

Keywords

Active Tectonics, Ground Motion Prediction Equation, Plate Interface Earthquake, Seismic Hazard.

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