Himanshu Agrawal - Students Portal of IISER Kolkataha15ms087/CV.pdf · (a) (b)...
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Himanshu Agrawal Kolkata, India | Skype ID- himansh78_1 | www.iiserkol.ac.in/~ha15ms087/ +91-8348242935 | [email protected] | [email protected] Currently in the Final year (5th year) of integrated BS-MS program at Department of Earth Sciences , Indian Institute of Science Education and Research, Kolkata (IISERK), India. Working in IISER Kolkata Seismological Observatory . Research Interest I am interested in quantifying the state of knowledge about the Earth using the measurements that we make at the surface in terms of geophysical parameters. This includes solving inverse problems to find a best-fit model of the Earth and interpreting that with the motivation of advancing the existing knowledge of geodynamics. I also take an interest in making use of the most recent advancements in computational methods (for example- Machine Learning techniques) to find out innovative ways to solve geophysical inverse problems. Projects 2019 [ONGOING] P AND S WAVE VELOCITY AND ATTENUATION STRUCTURE IN THE JAMMU AND KASHMIR HIMALAYAN REGION under supervision of Prof. Supriyo Mitra (IISER Kolkata) and Dr Christian Haberland (GFZ Potsdam). About: Jammu and Kashmir region (NW Himalaya) owes its existence to collision hence the occurrence of earthquake events is a part of the tectonic evolution of the Himalaya and shall continue in the future which itself evokes high hazard vulnerability. As my master’s project with Prof. Supriyo Mitra, I have estimated P and S wave velocity and attenuation tomography of that region using the following approach: • Relocating the events using nonlinear relocation algorithm. • Calculating the min-1D model using simultaneous velocity and hypocenter inversion • Using 1D model calculated above, Inverting the travel-times and attenuation parameters for velocity and attenuation structures. The obtained velocity structure is insightful in terms of remarkable correlation with tectonically active zones and sediment thickness in our study area. Figure 1: (a)1D model obtained using travel time residual minimization of the events in the NW Himalaya. (b) The study area of NW Himalaya. (c) P wave velocity anomaly tomography slice along the profile shown using the red line in (b). Positive velocity anamolies showing the low velocity zone and hence corresponding to tectonically active area and tethyean sedimentary remains. 2019 3-D SEISMIC WAVE ATTENUATION TOMOGRAPHY OF THE MAUPASACQ REGION IN THE PYRENEAN RANGE under supervision of Dr. Arantza Ugalde and Dr. Caeser R. Ranero (ICM Barcelona, Spain). About: In the framework of the MAUPASACQ project, a dense seismic network of 440 three-component stations was deployed throughout the Mauleon Basin, in the northern foothills of the Pyrenees, SW France. I evaluated the seismic wave attenuation in that region with Dr. Arantza Ugalde. The key steps for the procedure included: • Evaluating amplitude spectra using multitaper approach. • Fitting the spectra using Levenberg–Marquardt algorithm. • Computing tomography using SIMUL2000 program. [In the process]
Transcript of Himanshu Agrawal - Students Portal of IISER Kolkataha15ms087/CV.pdf · (a) (b)...
Himanshu Agrawal Kolkata, India | Skype ID- himansh78_1 | www.iiserkol.ac.in/~ha15ms087/
+91-8348242935 | [email protected] | [email protected]
Currently in the Final year (5th year) of integrated BS-MS program at Department of Earth Sciences , IndianInstitute of Science EducationandResearch, Kolkata (IISERK), India. Working in IISER Kolkata Seismological Observatory.
Research InterestI am interested in quantifying the state of knowledge about the Earth using the measurements that we make atthe surface in terms of geophysical parameters. This includes solving inverse problems to find a best-fit model ofthe Earth and interpreting that with the motivation of advancing the existing knowledge of geodynamics. I alsotake an interest inmaking use of themost recent advancements in computationalmethods (for example- MachineLearning techniques) to find out innovative ways to solve geophysical inverse problems.
Projects2019 [ONGOING] P AND SWAVE VELOCITY AND ATTENUATION STRUCTURE IN THE JAMMU AND KASHMIR
HIMALAYAN REGIONunder supervision of Prof. Supriyo Mitra (IISER Kolkata) and Dr Christian Haberland (GFZ Potsdam).About: Jammu and Kashmir region (NW Himalaya) owes its existence to collision hence the occurrence ofearthquake events is a part of the tectonic evolution of the Himalaya and shall continue in the future whichitself evokes high hazard vulnerability. As mymaster’s project with Prof. Supriyo Mitra, I have estimated Pand S wave velocity and attenuation tomography of that region using the following approach:
• Relocating the events using nonlinear relocation algorithm.• Calculating the min-1Dmodel using simultaneous velocity and hypocenter inversion• Using 1Dmodel calculated above, Inverting the travel-times and attenuation parameters for velocityand attenuation structures.
The obtained velocity structure is insightful in terms of remarkable correlation with tectonically active zonesand sediment thickness in our study area.
Figure 1: (a)1D model obtained using travel time residual minimization of the events in the NW Himalaya.(b) The study area of NW Himalaya. (c) P wave velocity anomaly tomography slice along the profile shown usingthe red line in (b). Positive velocity anamolies showing the low velocity zone and hence corresponding to tectonicallyactive area and tethyean sedimentary remains.
2019 3-D SEISMIC WAVE ATTENUATION TOMOGRAPHY OF THE MAUPASACQ REGION IN THE PYRENEANRANGEunder supervision of Dr. Arantza Ugalde and Dr. Caeser R. Ranero (ICM Barcelona, Spain).About: In the framework of the MAUPASACQ project, a dense seismic network of 440 three-componentstations was deployed throughout the Mauleon Basin, in the northern foothills of the Pyrenees, SW France. Ievaluated the seismic wave attenuation in that region with Dr. Arantza Ugalde. The key steps for theprocedure included:
• Evaluating amplitude spectra using multitaper approach.• Fitting the spectra using Levenberg–Marquardt algorithm.• Computing tomography using SIMUL2000 program. [In the process]
(a)(b)
Figure 2: (a) shows the raypath coverage in the Pyrenean range and (b) shows Example of amplitude spectra of an eventcomputed through multitaper approach and fitted through Levenberg-Marquardt algorithm.
2018 EARTHQUAKE RAY PATH CLUSTERING USING MACHINE LEARNING ALGORITHM (DBSCAN)under supervision of Prof. Supriyo Mitra (IISER Kolkata)About: The clustering is done to set up data for group velocity tomographic inversion. Each cluster istreated as a single measurement, where the group velocity of the path is the group velocity of the mean ofthe cluster and the error is the standard error in the cluster. Clustering is done using the following derivedtechnique:
• Sequential grouping of lines based on slope.• Within each cluster from step 1, Centers of lines are clustered into smaller groups using DBSCANalgorithm.
• Within each group from step 2, raypaths are grouped within defined threshold.
(a) Source–receiver ray path coverage ofthe love wave for the complete datasetused in the analysis.
(b) Checkerboard test results fornon-clustered ray coverage at 20 speriod with checker width of 5◦.
(c) Checkerboard test results forclustered ray coverage at 20 s periodwith checker width of 5◦. Improvementscan be seen between Long: 85◦ to 100◦
and Lat: 15◦ to 35◦
Figure 3: Results obtained after using tomographic algorithm by Sambridge & Gudmundsson (1998) (c) with and (b)without clustering for the dataset in (a)
2017 2D GRAVITY COMPUTATION ANDMODELLING OF SEDIMENTARY BASIN USING PYTHON PROGRAMWITHAPPLICATION TO THE GODAVARI BASINunder supervision of Dr. Vishnubhotla Chakravarthi (University of Hyderabad, India)About: Gravity anomalies by complicated geological shapes are always useful in understanding the crustalstructure. For the forward problem in gravity modelling, a method developed by Talwani et al. (1959) isused. While for the inverse problem, successive misfit minimization of Bouguer anomaly is done. The data isused to model the Godavari Basin.
2017 FIELD WORK IN GALUDIH AND GHAATSHILA REGION OF SINGBHUM CRATONSunder supervision of Dr. Kathakali Bhattacharya (IISER Kolkata, India)About: Structural mapping of deformations associated in the Galudih region is done. Mineralogy is studiedin-depth, and inferences on the tectonic history of outcrops are hypothesized.
2016 WORK PHENOMENON IN CARBON NANOTUBESunder supervision of Dr. Manoj Kumar (MNIT, Jaipur)About: Learnt the geological use of carbon nanotubes in exploration and the experimental techniques forfunctionalization of MWCNT (Multi-Walled Carbon Nanotubes).
Experiences2018 [TEACHING ASSISTANT] SEISMIC ATTENUATION USING CODAWAVES
under supervision of Prof. Supriyo MitraAbout: Indian Government scheduled a lecture series by Prof. Supriyo Mitra on advanced seismology inIISER Kolkata. I helped him with the hands-on in finding the seismic attenuation in Eastern Himalaya bymeasuring the temporal decay of coda waves [Thirunavukarasu et al., 2017].
2019 [TEACHING ASSISTANT] SEISMOLOGY THEORY COURSE (ES3105)under supervision of Dr. Kajaljyoti BorahAbout: I am currently a teaching assistant in seismology course of 3rd year BS-MS batch students.
Conference Abstracts/Presentations2019 AGRAWAL, H., MITRA, S. (2019):
A novel approach for spatial clustering of 2-D earthquake-receiver raypaths using a machine learningalgorithm. Abstracts of European Geosciences Union (EGU) General Assembly, 7-12 Apr 2019, Vienna, Austria;Geophysical Research Abstracts, Vol. 21, EGU2019-1041, 2019
2019 AGRAWAL, H., MITRA, S. (2019):P wave attenuation tomography using spectral fitting and back-projection algorithm. UNDERSTANDINGEARTH: CLIMATE CHANGE TO GEOHAZARDS, 1-2 Mar 2019, IISER Kolkata, India
Scholarships and awards2019 ROLAND SCHLICH TRAVEL AWARD FOR EGU GENERAL ASSEMBLY 2019
Selected for Early Career Scientist’s Travel Support belonging to abstract- EGU2019-1041, Title:“A novelapproach for spatial clustering of 2-D earthquake-receiver raypaths using a machine learning algorithm” byHimanshu Agrawal and Supriyo Mitra, for European Geosciences Union general assembly 2019.
2015 INNOVATION FOR SUSTAINABILITYSelected for National Sustainability Case Challenge, held at BIMTECH greater Noida, in top 50 teamsnationwide.
2015-2020 INSPIRE FELLOWSHIPReceiving the Innovation in Science Pursuit and Inspired Research Fellowship grant from theDepartment of Science and Technology, Government. of India.
2012 Awarded asMathura Genius 10 by Partha Educational foundation, India.
Education2018 5TH YEAR INTEGRATED BS-MS I ISER Kolkata C.G.P.A.- 8.73/10
2014 INTERMEDIATE SJBSVM, Mathura Scored 91.6 percent aggregate.
2012 HIGH SCHOOL (10TH STANDARD) SJBSVM, Mathura C.G.P.A.- 10/10
Relevant Courses in Seismology:
2018 Inverse theory (code : ID4109) Grade obtained: A+
2018 Seismology Laboratory (code: ES3203) Grade obtained: A+
2017 Seismology (code : ES3105) Grade obtained: A+
Software skillsPackages: SAC, Obspy, NonLinLoc, Simulps, HYPO71, VELESTProgramming Languages: Python, C, Bash, FORTRANOperating systems: Windows, Linux, Mac OSTools: Generic Mapping Tools, Gnuplot, turtle, origin, , Matplotlib, Paraview LATEX, InkscapeOther : HTML, XML, CSS
Major Examinations2015 Indian Institute of Technology, Joint Entrance Exam Advanced- 99.3 percentile
2011 5th International Mathematics Olympiad International rank - 3368
Science camps2015 National Sustainability Case Challenge held at BIMTECH, Greater Noida, India.
2015 National Science Camp (VIJYOSHI) held at IISER Kolkata, India.
2015 Indian International Science Fest (IISF) 2015 held at Indian Institute of Technology (IIT) Delhi, India.
2011 Prantiya baudhhik, vedik ganit evam vigyanmela held in Agra, Indiavedic mathematics competition.
Non-Academic ActivitiesElected Positions:2018-19 Chief Operational Officer - Entrepreneurship cell, IISERK
2017-18 Member -Institute Outreach committee, IISERK
2017-18 Treasurer - Bodybuilding and Fitness Club IISERK
2017 Head of Public Relations Team - Inquivesta 7, India’s largest Science Festival
2016-17 Secretary - PIXEL Photography club
Sports:
2015 Teammember in Interbatch Basketball tournament at IISERK
Cultural events:2016 Won the ”Take two” mime competition in Inquivesta 6
I am an avid Photographer and take keen interest in participating in any event I can find.
LanguagesHindi Mother tongue
English Medium of education since 12 years | TOEFL ibt score : 103/120
RefereesProf. Supriyo Mitra , IISER Kolkata, India. Email [email protected]. Christian Haberland, GFZ, Potsdam, Germany. Email: [email protected]. Arantza Ugalde, ICM, CSIC, Barcelona. Email: [email protected]
