NDLI: Subcrustal Low Velocity Layers in Central India and their Implications

Please wait, while we are loading the content...

Comment on “Modeling Low-frequency Magnetic-field Precursors to the Loma Prieta Earthquake with a Precursory Increase in Fault-zone Conductivity,” by M. Merzer and S. L. Klemperer

Book Review : Pure and applied geophysics , Volume 162 , Issue 12

Volcanic Tremor at Mt. Etna, Italy, Preceding and Accompanying the Eruption of July – August, 2001

Pure and applied geophysics : Volume 162, Issue 11, November 2005

Pure and applied geophysics : Volume 162, Issue 10, October 2005

Pure and applied geophysics : Volume 162, Issue 8-9, August 2005

Pure and applied geophysics : Volume 162, Issue 6-7, June 2005

Pure and applied geophysics : Volume 162, Issue 5, May 2005

Pure and applied geophysics : Volume 162, Issue 4, April 2005

Pure and applied geophysics : Volume 162, Issue 3, March 2005

Pure and applied geophysics : Volume 162, Issue 2, February 2005

Pure and applied geophysics : Volume 162, Issue 1, January 2005

Pure and applied geophysics : Volume 161

Pure and applied geophysics : Volume 160

Pure and applied geophysics : Volume 159

Pure and applied geophysics : Volume 158

Pure and applied geophysics : Volume 157

Pure and applied geophysics : Volume 156

Pure and applied geophysics : Volume 155

Pure and applied geophysics : Volume 154

Pure and applied geophysics : Volume 153

Pure and applied geophysics : Volume 152

Pure and applied geophysics : Volume 151

Pure and applied geophysics : Volume 150

Pure and applied geophysics : Volume 149

Subcrustal Low Velocity Layers in Central India and their Implications

Content Provider	Springer Nature Link
Author	Murty, A. S. N. Tewari, H. C. Kumar, Prakash Reddy, P. R.
Copyright Year	2005
Abstract	A 2-D subcrustal velocity model for the central Indian continental lithosphere has been derived by travel time and relative amplitude modeling of a digitally normalized analog seismic record section of the Hirapur-Mandla DSS profile, using a ray-tracing technique. Some prominent wave groups with apparent velocities slightly higher than the Moho reflection phase (PMP) are identified on the normalized record sections assembled with a reduction velocity of 6 km s−1. We interpret these phases as the wide-angle reflections from subcrustal lithospheric boundaries. Comparison of synthetic seismograms with the observed record section shows that the observed phases cannot be explained either by multiples or by the P-to-S converted phase (PMS) from the Moho. Subcrustal velocity models either with a velocity increase or with a single low velocity layer (LVL) also do not provide a satisfactory fit. We infer that a subcrustal velocity model with two alternate LVLs (velocity 7.2 km s−1), separated by a 6-km thick high velocity layer (velocity 8.1 km s−1), can satisfy both the observed travel times and amplitudes. The prominent reflection phases are modeled at depths of 49, 51, 57 and 60 km. It is inferred that the subcrustal lithosphere in the central Indian region has a lamellar structure with varying structural and mechanical properties. The alternating LVLs, occurring at relatively shallow depths below Moho, may be associated with the zones of weakness and lower viscosity suggesting continued mobility, with a possible thermal source in the upper mantle. This explains the source of observed high heat flow values in the central Indian region.
Starting Page	2409
Ending Page	2431
Page Count	23
File Format	PDF
ISSN	00334553
Journal	Pure and applied geophysics
Volume Number	162
Issue Number	12
e-ISSN	14209136
Language	English
Publisher	Birkhäuser-Verlag
Publisher Date	2005-08-23
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wide-angle reflection upper mantle synthetic seismograms narmada zone low velocity layers seismic velocity Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

2-D Crustal Velocity Structure Along Hirapur-Mandla Profile in Central India: An Update

Delineation of Subtrappean Mesozoic Sediments in Deccan Syneclise, India, Using Travel-Time Inversion of Seismic Refraction and Wide-Angle Reflection Data

Seismic velocity estimation from post-critical wide-angle reflections in layered structures

Synthetic Seismograms and Wide-angle Seismic Attributes from the Gaussian Beam and Reflectivity Methods for Models with Interfaces and Velocity Gradients

Array Triplication Data Constraining Seismic Structure and Composition in the Mantle

Magnetic Data Interpretation for the Source-Edge Locations in Parts of the Tectonically Active Transition Zone of the Narmada-Son Lineament in Central India

Degree of serpentinization in the forearc mantle wedge of Kyushu subduction zone: quantitative evaluations from seismic velocity

Upper Mantle Seismic Structure Beneath Southern Africa: Constraints on the Buoyancy Supporting the African Superswell

Upper-mantle S-velocity structure across the Zagros collision zone resolved by nonlinear teleseismic tomography

Subcrustal Low Velocity Layers in Central India and their Implications

Similar Documents

2-D Crustal Velocity Structure Along Hirapur-Mandla Profile in Central India: An Update

Delineation of Subtrappean Mesozoic Sediments in Deccan Syneclise, India, Using Travel-Time Inversion of Seismic Refraction and Wide-Angle Reflection Data

Seismic velocity estimation from post-critical wide-angle reflections in layered structures

Synthetic Seismograms and Wide-angle Seismic Attributes from the Gaussian Beam and Reflectivity Methods for Models with Interfaces and Velocity Gradients

Array Triplication Data Constraining Seismic Structure and Composition in the Mantle

Magnetic Data Interpretation for the Source-Edge Locations in Parts of the Tectonically Active Transition Zone of the Narmada-Son Lineament in Central India

Degree of serpentinization in the forearc mantle wedge of Kyushu subduction zone: quantitative evaluations from seismic velocity

Upper Mantle Seismic Structure Beneath Southern Africa: Constraints on the Buoyancy Supporting the African Superswell

Upper-mantle S-velocity structure across the Zagros collision zone resolved by nonlinear teleseismic tomography

Subcrustal Low Velocity Layers in Central India and their Implications