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Gupta, Harsh K.
- The Loma Prieta, California Earthquake of October 17, 1989 - Main Shock Characteristics
Abstract Views :192 |
PDF Views:129
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 6 (1998), Pagination: 834-837Abstract
No Abstract.Full Text
- Some Recent Earthquakes in Peninsular India
Abstract Views :241 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad, 500007, IN
1 National Geophysical Research Institute, Hyderabad, 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 22, No 6 (1981), Pagination: 292-298Abstract
The Peninsular Shield of India, generally considered to be aseismic, has recently experienced significant activity al Koyna (1967), Bhadrachalam (1969) and Broach (1970). Besides, over two hundred tremors, with magnitudes ranging from 2 to 5, have also been identified mainly in Andhra Pradesh, Karnataka and Maharashtra during 1967 to 1977, and are catalogued. Low magnitude activity (M < 4) is observed to be prevalent in the Peninsular Shield.
- Identification of Seismic Sources-Earthquake for Underground Explosion
Abstract Views :150 |
PDF Views:4
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum, IN
1 Centre for Earth Science Studies, Trivandrum, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 2 (1983), Pagination: 111-112Abstract
No Abstract.- Studies Related to the Charleston, South Carolina, Earthquake of 1886 - Tectonics and Seismicity
Abstract Views :186 |
PDF Views:112
Authors
Affiliations
1 Central for Earth Science Studies, Trivandrum 695 010, IN
1 Central for Earth Science Studies, Trivandrum 695 010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 12 (1983), Pagination: 673-674Abstract
No Abstract.Full Text
- Seismicity in the Vicinity of Dams on Himalayan Rivers and the Problem of Reservoir Induced Earthquakes
Abstract Views :203 |
PDF Views:4
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum 695010, IN
1 Centre for Earth Science Studies, Trivandrum 695010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 2 (1984), Pagination: 85-93Abstract
The question of Reservoir Induced Seismicity (RIS) in the Vicinity of dams across Himalayan Rivers specifically the large reservoirs (exceeding a capacity of 1 km3 and/or the height of the dam bemg 100 m and more), is examined. The thrust fault environment, generally prevalent in the Himalayan foothills, is not conducive for RIS. All the eleven large reservoir on the Himalayan rivers are located in regions of high seismicity and earthquakes of magnitude ≥7 have occurred, in the past within 100 km of these dam sites. Occurrence of Similar natural earthquakes (not induced by the reservoirs) in the future is quite probable It is absolutely essential to carty out necessary seismic surveillance at large reservoirs at the planning stage.- Seismicity and Seismic Risk in the Offshore North Sea Area
Abstract Views :161 |
PDF Views:114
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum, IN
1 Centre for Earth Science Studies, Trivandrum, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 3 (1984), Pagination: 196-196Abstract
No Abstract.Full Text
- The Third Indian Scientific Expedition to Antarctica
Abstract Views :167 |
PDF Views:4
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum 695010, IN
1 Centre for Earth Science Studies, Trivandrum 695010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 9 (1984), Pagination: 543-556Abstract
The Third Indian Scientific Expedition to Antarctica, organized by the Department of Ocean Development, Government of India, had the responsibility of setting up of a permanent station at Antarctica in addition to carrying out research and observations in diversified scientific disciplines. A brief report of the expedition is presented here.- Cachar Earthquake of December 31, 1984 is it a Signal for the Beginning of Seismic Activity?
Abstract Views :203 |
PDF Views:4
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum·695 010, IN
1 Centre for Earth Science Studies, Trivandrum·695 010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 2 (1985), Pagination: 145-147Abstract
The Cachar earthquake of December 31, 1984 is significant on two counts: i) It occurred in a region identified to be experiencing dilatancy stage precursory to a large earthquake by Gupta and Singh (1980), ii) An earthquake of magnitude exceeding 6 has occurred in the vicinity of the Shillong Plateau after a lapse of four decades. This may be signal of beginning of a seismically active period in the vicinity of Shillong Plateau similar to the one between 1869 and 1943 when six large earthquakes occurred in this region.- Seismicity of the North-East India Region
Abstract Views :161 |
PDF Views:3
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum 695 010, IN
1 Centre for Earth Science Studies, Trivandrum 695 010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 5 (1986), Pagination: 345-365Abstract
The north-east India region is seismically one of the most active regions In the world. An earthquake data base for the region from the earliest time to 1984 is presented here. These data would be utilized for investigating the earthquake phenomenon in the region.- Seismicity of the North-East India Region Part II: Earthquake Swarms Precursory to Moderate Magnitude to Great Earthquakes
Abstract Views :192 |
PDF Views:4
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum 695 010, IN
1 Centre for Earth Science Studies, Trivandrum 695 010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 5 (1986), Pagination: 367-406Abstract
Since 1897, ten earthquakes of M ≥ 7½ have occurred in north-east India region and its vicinity including the great earthquakes of June 12, 1897 and August 15, 1950, both of M 8.7. The last earthquake belonging to this category, occurred on August 17, 1952. With the exception of three earthquakes, others are found to be associated with the epochs of background/normal seismicity, precursory swarm, quiescence and mainshock (and the associated foreshocks and aftershocks). In our investigations, the earthquake data have been critically examined and taking due care of prevalent location - capabilities and other parameters. The mainshock magnitude (Mm) is related to the magnitude of the largest events in the swarm (̅Mp) and the time interval Tp (in days) between the beginning of the swarm and the main shock. The regression equations are:
Mm = 1.37 ̅Mp - 1.41
and Mm = 3 log10 Tp - 3.27
Installation of the World Wide Standard Seismograph Network during 1962-63 improved the earthquake detection and location capabilities considerably in the northeast India region and all earthquakes of mb ≥ 4.5 are being located. Consequently, for the period 1963 through 1985, we have investigated all events of mb ≥ 6.1 for occurrence of precursory swarms. Ten such events have occurred, four of which in a quick succession in the Arakan Yoma fold belt within a time span of six months only, and constitute a well defined swarm. Two other earthquakes are possibly gap events of Arakan Yoma swarm. Out of the remaining four, three are found to be associated with epochs of normal/background seismicity, precursory swarm, quiescence and main. shock (and the associated foreshocks and aftershocks). The latest killer earthquake in northeast India of Dec. 30, 1984 of mb 5.6, which occurred in the vicinity of the Arakan Yoma fold belt and Shillong Plateau, was preceded by a well-defined precursory swarm and seismic quiescence.
The most important thing is to recognize the precursory swarms and quiescence in real time, before the occurrence of the main shock. We believe to have recognized one such sequence in the vicinity of Arakan Yoma fold belt. On the basis of Mp and Tp values, lateral extent of the swarm activity and the fact that no event of mb ≥ 6.1 has occurred since 1975 in the preparation zone defined by the 1963-65 swarm, we estimate that an earthquake of M 8 ½ could occur any time from now in an area bound by 21°N and 25½°N latitudes and 93°E and 96°E longitude, with a focal depth of 100±40km.
We have also recognized a region in Eastern Syntaxis where repeated swarms have occurred during 1968, 1977 and 1980. The largest events in these swarms, however, were only of mb 5 and the swarms were very localized. These may have been caused by magmatic emplacement at shallow crustal depths.
- Dr. N. G. K. Nair (1940 - 1985)
Abstract Views :201 |
PDF Views:118
Authors
Affiliations
1 Centre for Earth Science Swdies, Trivandrum - 695 010, IN
1 Centre for Earth Science Swdies, Trivandrum - 695 010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 2 (1986), Pagination: 242-242Abstract
No Abstract.Full Text
- Seismicity of the North-East India Region
Abstract Views :218 |
PDF Views:128
Authors
Affiliations
1 Cochin University of, Science and Technology, Cochin - 682 022, IN
1 Cochin University of, Science and Technology, Cochin - 682 022, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 3 (1988), Pagination: 249-250Abstract
No Abstract.Full Text
- Lithospheric Subduction Beneath the Arakan-Yoma Fold Belt: Quantitative Estimates Using Gravimetric and Seismic Data
Abstract Views :175 |
PDF Views:2
Authors
Affiliations
1 Cochin University of Science and Technology, Cochin 682022, IN
2 Bat 510, Universite de Paris-Sud, 91400 Orsay, FR
1 Cochin University of Science and Technology, Cochin 682022, IN
2 Bat 510, Universite de Paris-Sud, 91400 Orsay, FR
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 3 (1990), Pagination: 235-250Abstract
A set of consistent geophysical data show the presence of cold material at depth, east of the mountain chain, in the Arakan-Yoma fold belt region. There are intermediate focus earthquakes to a depth of 150 km or so and longitudinal seismic waves are faster under the chain than west of it. The pronounced gravity low, east of the chain, is well explained by cold high density material at depth in the seismic area, compensated by crustal thickening under the mountain chain and a sediment filled depression under the eastern basin. The gravity low flanking other collisional chains might also be due to compensation of cold material at depth rather than the usually invoked flexural effect.Keywords
Geophysics, Seismology, Arakan-Yoma, Intermediate Focus Earthquake.- Earthquakes Exceeding Magnitude 5 Occur Again in the Koyna Region
Abstract Views :190 |
PDF Views:137
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad, IN
1 National Geophysical Research Institute, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 4 (1993), Pagination: 413-415Abstract
No Abstract.Full Text
- Drilling at Latur Earthquake Region Exposes a Peninsular Gneiss Basement
Abstract Views :194 |
PDF Views:154
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
2 Atomic Minerals Division, Begumpet, Hyderabad - 500 O16, IN
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
2 Atomic Minerals Division, Begumpet, Hyderabad - 500 O16, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 47, No 1 (1996), Pagination: 129-131Abstract
Drilling at Killari in the Meizoseismal area of the 1993 Latur earthquake has revealed that the Deccan Basalt sequence here is 338 m thick, andis underlain by Peninsular Gneiss basement with an intervening 8 m Infra-Trappean sequence.Full Text
- Assessing Earthquake Hazards and Reducing Risk in the Pacific Northwest
Abstract Views :176 |
PDF Views:115
Authors
Affiliations
1 National GeopJzysical Research Institute (NGRI) Hyde rabad - 500 007, IN
1 National GeopJzysical Research Institute (NGRI) Hyde rabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 4 (1997), Pagination: 520-522Abstract
No Abstract.Full Text
- Early Warning System for Oceanogenic Disasters in Indian Ocean (Tsunami and Storm Surges): The Indian Initiative
Abstract Views :165 |
PDF Views:163
Authors
Affiliations
1 Department of Ocean Development Mahasagar Bhavan, Lodi Road New Delhi - 110 003, IN
1 Department of Ocean Development Mahasagar Bhavan, Lodi Road New Delhi - 110 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 5 (2005), Pagination: 639-646Abstract
No Abstract.Full Text
- A Note on the 26 December 2004 Tsunami in the Indian Ocean
Abstract Views :193 |
PDF Views:115
Authors
Affiliations
1 Dept. of Ocean Development, New Delhi- 110 003, IN
1 Dept. of Ocean Development, New Delhi- 110 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 2 (2005), Pagination: 247-248Abstract
No Abstract.Full Text
- Earthquake Related Dewatering Using MISR/TERRA Satellite Data
Abstract Views :176 |
PDF Views:130
Authors
Affiliations
1 Department of Ocean Development New Delhi - 110 003, IN
1 Department of Ocean Development New Delhi - 110 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 5 (2003), Pagination: 622-622Abstract
No Abstract.Full Text
- Kutch (BHUJ) Earthquake of 26th January 2001.
Abstract Views :159 |
PDF Views:130
Authors
Affiliations
1 Department of Ocean Development New Delhi - HO 003, IN
1 Department of Ocean Development New Delhi - HO 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 4 (2003), Pagination: 519-520Abstract
No Abstract.Full Text
- Oldest Neolithic Settlements Discovered in Gulf of Cambay
Abstract Views :178 |
PDF Views:132
Authors
Affiliations
1 Department of Ocean Development, New Delhi - 110 003, IN
1 Department of Ocean Development, New Delhi - 110 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 3 (2002), Pagination: 277-278Abstract
No Abstract.Full Text
- A Comprehensive Survey of the 26thJanuary Earthquake (Mw 7.7) in the State of Gujarat, India
Abstract Views :210 |
PDF Views:128
Authors
Affiliations
1 Department of Ocean Development Block-12, CGO Complex, Lodhi Road, New Delhi - 11 0 003, IN
1 Department of Ocean Development Block-12, CGO Complex, Lodhi Road, New Delhi - 11 0 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 5 (2002), Pagination: 481-482Abstract
No Abstract.Full Text
- Bhuj Earthquake of 26 January, 2001
Abstract Views :181 |
PDF Views:615
Authors
Harsh K. Gupta
1,
T. Harinarayana
1,
M. Kousalya
1,
D. C. Mishra
1,
Indra Mohan
1,
N. Purnachandra Rao
1,
P. S. Raju
1,
B. K. Rastogi
1,
P. R. Reddy
1,
D. Sarkar
1
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 57, No 3 (2001), Pagination: 275-278Abstract
No Abstract.Full Text
- Chapman Conference on Stable Continental Region (SCR) Earthquakes
Abstract Views :181 |
PDF Views:106
Authors
Affiliations
1 National Geophysical Research Institute Hyderabad, IN
2 Centre For Earthquake Research & Information, University Of Memphis, US
1 National Geophysical Research Institute Hyderabad, IN
2 Centre For Earthquake Research & Information, University Of Memphis, US
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 1 (1998), Pagination: 115-117Abstract
No Abstract.Full Text
- The National Earthquake Hazards Reduction Program-Scientiric Status
Abstract Views :192 |
PDF Views:107
Authors
Affiliations
1 Centre for Earth Science Studies Trivandrum-695010, IN
1 Centre for Earth Science Studies Trivandrum-695010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 29, No 2 (1987), Pagination: 281-284Abstract
No Abstract.Full Text
- Research Highlights in Earth System Science
Abstract Views :162 |
PDF Views:163
Authors
Affiliations
1 Department of Ocean Development, Mahasagar Bhavan, Block 12, CGO Complex New Delhi - 110 003, IN
1 Department of Ocean Development, Mahasagar Bhavan, Block 12, CGO Complex New Delhi - 110 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 5 (2002), Pagination: 607-609Abstract
No Abstract.Full Text
- Understanding anthropogenic earthquakes
Abstract Views :185 |
PDF Views:73
Authors
Affiliations
1 President, Geological Society of India, Member, Atomic Energy Regulatory Board,CSIR-NGRI, Hyderabad 500 007, IN
1 President, Geological Society of India, Member, Atomic Energy Regulatory Board,CSIR-NGRI, Hyderabad 500 007, IN
Source
Current Science, Vol 120, No 9 (2021), Pagination: 1415-1416Abstract
No Abstract.Keywords
No KeywordsFull Text