R E S E A R C H & E X P E R I E N C E
Research Interest
General Statement
I am interested in solving geophysical problems by following inverse methods and estimating appropriate geophysical parameters which will help us to find a best fitting model to explain various geophysical processes occurring on the surface and in its beneath, thus unravelling the earth’s structure and the geodynamic nature. In my master’s thesis, I have analyzed local coda waves, estimated attenuation in the Jammu and Kashmir Himalaya and studied its lateral variation by constructing tomography maps and confirmed its spatial resolution by doing a checkerboard test. I am highly motivated to do research which will help me to introduce with newly discovered, advanced computational methods so that I can increase my skills and also very excited to innovate new ways to solve geophysical problems.
Specific
Fields
I am really focussed to do research on seismic attenuation, earthquake source, seismic wave propagation, plate tectonics and thus studying crust and upper mantle.
Timeline
2019
to
2020
Master's Thesis Work
”Seismic Attenuation Tomography of the Jammu and Kashmir Himalaya using Coda Waves” master’s thesis under the supervision of Prof. Supriyo Mitra, Department of Earth Sciences, IISER Kolkata.
A B O U T >>> The collision between Indian plate and the Eurasian plate gave rise to the world’s highest mountain belt, the Himalayas. Every year, a huge number of earthquakes occur along this active convergent plate boundary system. So it is very important to evaluate ground shaking from future earthquakes by studying attenuation characteristics and to relate it to the local geology. For this purpose a 2-D seismic array, Jammu And Kashmir Seismological NETwork (JAKSNET), has been deployed in the Jammu and kashmir Himalaya with the help of International collaborative projects between IISER Kolkata (IK), Shri MataVaishno Devi University (SMVDU), Katra, Jammu and Kashmir, India, and the University of Cambridge, UK. The whole process is done by following steps
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Analyzing local coda waveforms and calculating the quality factor (Qc, Q0 - a inverse quantification of attenuation) and the frequency dependence parameter (η).
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Choosing a suitable combination of lapse time (Lt) and coda window length (Cw) to make sure that the coda waves reach the diffusive regime.
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Constructing 2-D tomography to study the lateral variation of attenuation and checkerboard to confirm the spatial resolution in this Jammu and Kashmir Himalaya.
We observed that the measured Q for different regions clearly correspond to the coda wave attenuation signatures in the different rock types in these respective regions. See the figures below where I have put raypath coverage, Q0 tomography and checkerborad test results (from left to right) from earlier stages of analysis.
Request for the thesis report to
Summer Internship
2018
May-July
”Computation of Accumulated Strain in Kutch region of Gujarat and its Comparison with that in the Interplate Deformation system in Andaman Subduction zone” under the supervision of Dr. Himangshu Paul, Project Scientist, Solid Earth Geophysics Group, Institute of Seismological Research (ISR), Gujarat. [presently a scientist at CSIR-National Geophysical Research Institute (NGRI), Hyderabad]
A B O U T >>> In this study, we introduce depth wise variation of strain in the Kutch Basin area and Andaman. We briefly recapitulate the decomposition of moment tensor. Using earthquake data having proper strike, dip and rake of the fault, we calculate moment tensor elements followed by strain tensor elements in the Kutch and the Andaman region. Most importantly depth wise calculation of strain is done as well for both the regions. From there we compare the strain between Kutch and Andaman depth wise and also explore the reasons which mostly match with previously accepted studies.
Request for the project report to
Conferences Abstracts/Presentations
2020 December
American Geophysical Union 2020 Fall Meeting Online.
I will be participating in the AGU 2020 virtual meeting and I have submitted my abstract titled ”Seismic Attenuation Tomography of the Jammu and Kashmir Himalaya using Coda Waves”. I have been selected to receive a prestigious Virtual Berkner travel Grant for this fall meeting.
2020 May
European Geosciences Union General Assembly Online.
I submitted an abstract titled ”Seismic Attenuation Tomography of the North Western Himalaya using Coda Waves” for this conference and virtually participated in the meeting and the live chat and presented my abstract.
Read the abstract in the EGU website.
Read the abstract in the google scholar page.
2020 February
Earth Sciences Departmental Day, IISER Kolkata.
I have presented a poster highlighting my work ”Seismic Attenuation Tomography of the North-Western Himalaya using Coda Waves”.
Class/Course Projects
2019 8th Semester
Prediction of Geographical Origin of Music according to Their Features. A MATLAB project Supervised by Dr. Koel Das (Stat Lab Course), IISER Kolkata.
Finding the correlation between the musical features of different places by various methods like Standard K-Nearest Neighbour Model(KNN), Random KNN, Random Forest Regression and some Modified methods using Cross Validation, Data Seeding, Bootstrapping algorithms etc.
2019 8th Semester
Sedimentology project on Chandipur Coast. Supervised by Dr. Adrita Choudhuri and Dr. Sukanta Dey (Sedimentology Lab Course), IISER Kolkata.
Identification of Shoreline orientation from both the modern and ancient environment in Chandipur and Sediment Biota interaction observed along the Chandipur coast and their conclusion.
2019 8th Semester
Precambrian and Phanerozoic Geology of India. Supervised by Dr. Sukanta Dey (Statigraphy Course), IISER Kolkata.
A research in early earth Geodynamics means if there are enough evidence of plate tectonics and other dynamic events in Archean and Hadean time and knowing how the Origin of Life thesis is developed in recent times.
2019 8th Semester
Plotting Rarefaction Curves for different taxa by coding. Supervised by Dr. Devapriya Chattopadhyay (Paleontology Course), IISER Kolkata.
Using MATLAB commands I successfully plotted rarefaction curves for Species, Genera, Family and Order versus number of Individuals in a Cumulative way which are matched with the standard results.
2018 7th Semester
Igneous processes along convergent boundaries: Island Arcs. Supervised by Dr. Tapabrato Sarkar (Igneous and Metamorphic Petrology), IISER Kolkata.
Structure of Island Arc, Magma generation, Evolution of magma, Characteristic Magma series, Associated rock types, Variation in Island arc magmatism with time and space, Chemical composition and petrogenesis of erupted magma etc.
2018 6th Semester
Mechanism of Boudinage Formation, Insights from Theoretical, Experimental and Field Studies. Supervised by Dr. Kathakali Bhattacharyya, Dr. Tapabrato Sarkar (Structural Geology), IISER Kolkata.
Classification and General Types of Boudinage, their dependency, Geometry of boudinages, aspect Ratio relation, Formation of tablet boudinage etc.
2017 5th Semester
Seismology Projects on Wave Propagation. Supervised by Prof. Supriyo Mitra (Seismology Course), IISER Kolkata.
Seismic Wave propagation in a layer over a half space with horizontal and dipping interface.
2016
Study of fractals, Koch curve, Cantor Dust, Sierpinski Triangle and their properties.
A simulation in Python, under the supervision of Dr. Ananda Dasgupta, Department of Physical Sciences, IISER Kolkata.
Reading Project
2016
Summer
Reading project on Quantum mechanics. Supervised by Dr. Sudhansu Sekhar Mandal, IIT Kharagpur.
Potential energy for the hydrogen atom, solving the time-independent Schrodinger equation in three dimensions, angular wave function, finding the ground state etc.
Field Experience
2018
Winter
Sedimentology Field work and Study of Marine environments along the coast of Chandipur, Dagara and Study of Rock Sections around Sitakund Waterfalls, Odisha, India. Under the supervision of Dr. Adrita Choudhuri and Dr. Sukanta Dey, Department of Earth Sciences, IISER Kolkata.
2017
Winter
Structural Geology Field work in Galudih and Ghaatshila region of Singbhum Cratons, under the supervision of Dr. Kathakali Bhattacharyya and Dr. Tapabrato Sarkar. Structural mapping, geometrical and kinematic analysis of deformation are done using different geological techniques.
Teaching Experience
2020
Spring
I was the teaching assistant of 3rd year Seismology Lab Course (Course code: ES3203). Instructed by Dr. Kajaljyoti Borah, Department of Earth Sciences (DES), IISER Kolkata.
2020
Spring
I was the teaching assistant of 2nd year Geophysics Course (Course Code: ES2201). Instructed by Dr. Kajaljyoti Borah, DES, IISER Kolkata.
Seminars, Science Camps and Talks attended
2020
[DES Webinar] Prof. Supriyo Mitra (IISER Kolkata): Did coronavirus lockdown reduce seismic noise and improve earthquake detection?
DES i.e. Department of Earth Sciences. To Visit the webpage click the button at the end of this line.
2020
Department of Earth Sciences Day (DES Day) camp. Also attended DES day in 2019 and 2018.
2019
[CCES Seminar] Prof. Frederik Tilmann (Freie University Berlin): The Value of Patience — a Review of a Decade of Observations of the North Chilean Subduction with the Integrated Plate boundary Observatory Chile (IPOC).
CCES i.e. Center for Climate and Environmental Studies. To Visit the webpage click the button at the end of this line.
2019
[DES Seminar] Prof. Frederik Tilmann (GFZ Potsdam, Germany): Deep structure, geodynamics and crustal tectonics of the Pamir and Hindu Kush: why there are there deep earthquakes below the Pamir and Hindukush but not the Himalayas?.
2019
[CCES Seminar] Prof. Jay Pulliam (Baylor University USA): Crustal structure across the Texas-Gulf of Mexico margin from seismic interferometry (Pg), regional (Pn), and teleseismic (P and SsPmp) constraints.
2019
[DES Seminar] Dr. Helen Williams (University of Cambridge): Tracing fluid transfer across subduction zones using iron and zinc stable isotopes.
2019
[CCES Seminar] Steve Grand (Univ. of Texas Austin, USA): Seismic structure of the upper mantle beneath Eastern Asia from full waveform tomography.
2019
[CCES Seminar] Eric Sandvol (Univ. of Missouri, USA): The Nature of Escape Tectonics and Coherent Deformation around the Eastern Himalayan Syntaxis.
2016
Stability Of Solar System by Cedric Villani (Field Medalist, 2010) in August, organised by Dept. of Mathematical Sciences,IISER Kolkata.
2015
National Science Camp VIJYOSHI, organized by KVPY and INSPIRE at Eastern Zone Cultural Centre, Kolkata and IISER Kolkata.
2012
I was selected to attend the INSPIRE CAMP (Internship Science Camp-2012) held at Raja Narendralal Khan Women’s College, Paschim Medinipur, West Bengal, India.