A5056798908- Earthquake Detection and Analysis
- earthquake and tectonic studies
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
- Geophysical and Geoelectrical Methods
- Solar and Space Plasma Dynamics
- Geological and Geochemical Analysis
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Geophysics and Gravity Measurements
- Seismology and Earthquake Studies
- Geological and Geophysical Studies
- Geochemistry and Geologic Mapping
- Atmospheric Ozone and Climate
- Radiomics and Machine Learning in Medical Imaging
- GNSS positioning and interference
- Complex Systems and Time Series Analysis
- Reservoir Engineering and Simulation Methods
- Characterization and Applications of Magnetic Nanoparticles
- Mineralogy and Gemology Studies
- Geophysical Methods and Applications
- Geophysics and Sensor Technology
- Lightning and Electromagnetic Phenomena
- History and Developments in Astronomy
National Geophysical Research Institute
2015-2024
Academy of Scientific and Innovative Research
2023
Council of Scientific and Industrial Research
2011-2021
Government of India
2017
Schmidt Institute of Physics of the Earth
2017
Abstract The lithospheric structure of the Indian plate has been investigated using converted wave techniques ( P and S receiver functions) a novel stacking analysis technique (without deconvolution) applied to large seismological data set from permanent temporary broadband seismic stations. We observe coherent energy at least two discontinuities, i.e., crust‐mantle (Moho) lithosphere‐asthenosphere boundary (LAB) in uppermost mantle. Here we provide image lithosphere showing definitive...
Abstract Artificial water reservoir-triggered earthquakes have continued at Koyna in the Deccan Traps province, India, since impoundment of Shivaji Sagar reservoir 1962. Existing models, to comprehend genesis triggered earthquakes, suffer from lack observations near field. To investigate further, scientific deep drilling and setting up a fault zone observatory depth 5–7 km is planned area. Prior undertaking drilling, an exploratory phase investigations has been launched constrain subsurface...
Abstract Koyna, located in the Deccan Volcanic Province western India, is most significant site of reservoir triggered seismicity (RTS) globally. The largest RTS event M 6.3 occurred here on December 10, 1967. at Koyna has continued. This includes 22 M≥5.0 and thousands smaller events over past 50 years. annual loading unloading cycles Reservoir nearby Warna influence RTS. provides an excellent natural laboratory to comprehend mechanism because earthquakes occur a small area, mostly depths...
Abstract. Seismo-electromagnetic (SEM) signatures recorded in geomagnetic data prior to an earthquake have the potential reveal pre-earthquake processes focal zones. The present study analyses vertical component of field from March 2019 April 2020 using fractal and multifractal approaches identify EM Campbell Bay (CBY), a seismically active region Andaman Nicobar. significant enhancements monofractal dimension spectrum width components analysis arise due superpositioned high- low-frequency...
Abstract. The development of the stages Choutuppal magnetic observatory over last 15 years has enabled effects natural environment like groundwater changes and lightning activity on data to be evaluated. A new survey for total field anomalies analysis is carried out understand nature subsurface. Based model from high resolution conductivity depth slices ERT EVRI surveys, distribution sandy regolith, saprolite, granitic layers in shallow subsurface delineated. This provides information...
Research Article| September 11, 2018 Lineaments in Deccan Basalts: The Basement Connection the Koyna–Warna RTS Region Kusumita Arora; Arora aCSIR‐National Geophysical Institute, Hyderabad 500007, India, karora_ngri@yahoo.co.uksrinu.geotech35@gmail.comgopinadh840@gmail.comrajen0555@gmail.comharisraza90@gmail.com Search for other works by this author on: GSW Google Scholar Y. Srinu; Srinu D. Gopinadh; Gopinadh R. K. Chadha; Chadha Haris Raza; Raza Valentin Mikhailov; Mikhailov bSchmidt...
Abstract Prompt penetration (PP) and ionospheric disturbance dynamo (Ddyn) are two expressions of the disturbed electric field developed during a geomagnetic storm in Earth's ionosphere. Earlier investigations treated these processes independently over longitudinal separation beyond 20°. In present study, we investigate conjunction phenomena on equatorial electrojet at 20° longitude separations using daytime magnetic data from three sites viz., Minicoy, Vencode, Campbell Bay low‐latitude...
This paper describes a 3-D lithospheric density model of the Western Continental Margin India (WCMI) based on forwardmodelling gravity data derived from satellite altimetry over ocean and surface measurements Indian peninsula. The covers northeastern Arabian Sea western part Peninsula incorporates constraints wide variety geophysical geological information. Salient features include: (1) Moho depth varying 13 km below oceanic crust to 46 continental interior; (2) lithosphere-asthenosphere...
Abstract This paper presents the seasonal and longitudinal variability of equatorial electrojet (EEJ) based on geomagnetic variation data from two stations in northern Indian Ocean at a separation ~15°: i.e., 77°E 93°E. One complete year is used (i.e., November 2011 to October 2012) longitudes compared with climatological model (EEJM‐2.0). The results our analysis show that (i) monthly averaged hourly values EEJ strength 93°E are overall agreement global characteristics significant...
Abstract. In spite of significant progress in the development new devices for magnetic measurements, mathematical and computational technologies data processing means communication, quality accessible through centres (for example, World Data Centres or INTERMAGNET) still largely depends on actual conditions which observation Earth's field is performed at observatories. Processing raw measurements by observatory staff plays an important role. It includes effective identification noise...
Abstract The study of seismo-electromagnetic emissions has the potential to provide new insights into physics seismic activity and improve our ability monitor predict earthquakes other geophysical events. In this study, we examine one year ground based geomagnetic data during March-2019 April − 2020 from Andaman subduction zone for signatures related lithospheric processes. We focus on anomalous in vertical component field after removing global seasonal effect data. have also scanned...
Abstract The limited longitudinal extent of equatorial counter electrojet (CEJ) has been inferred by several workers based on the analysis ground data. However, scale length CEJ characteristics at 2 h or less not estimated so far. present study seeks to characterize variability phenomena a separation ~15° using hourly averaged variations two (EEJ) pairs stations: Hyderabad and Vencode 77°E Port Blair Campbell Bay 93°E. nature events is classified time occurrence studied 12 months concurrent...
The characteristics of longitudinal variability equatorial electrojet (EEJ) and counter (CEJ), presented in this study, are based on concurrent observations from a hitherto unsampled region the world to examine (1) degree correlation between hourly means monthly averaged ground with climatological model (EEJM-2.0), (2) day-to-day EEJ strength pairs sites, (3) occurrences electrojet. analyses data obtained an observatory three new remote sites northern Indian Ocean at separation approximately...
Abstract The present study investigates the longitudinal variability of equatorial electrojet (EEJ) and counter (CEJ) phenomena using concurrent data from three low‐latitude paired stations/sites at 5°, 15°, 20° separation in Indian sector: (i) Minicoy (72°E, dip latitude 01.32°) Alibag 14.06°), (ii) Vencode (77°E, 01.02°) Hyderabad latitude12.34°), (iii) Campbell Bay (93°E, −0.79°) Nabagram 06.79°). observations, over a period 12 months, 72°E 77°E, 10 months 93°E, for year 2015, reflect...
Abstract The east–west component of the geomagnetic field (Y‐component) at Trivandrum (TRD) station, an equatorial site, is used to investigate characteristics Inter‐Hemispheric Field‐Aligned Currents (IHFACs) in Indian sector during solar cycles 21 and 22. observations reveal annual variation IHFAC dawn/noon with positive/negative peaks around northern summer. Furthermore, it noted that amplitudes are modulated by activity, superimposed seasonal effects, consistently higher summer months....