One-dimensional regional shear velocity structure from joint inversion of fundamental mode group velocity dispersion measurements of Love and Rayleigh waves: application to the Uttarakhand Himalaya

Gupta, Abhishek Kumar; Mandal, Prantik; Srinagesh, D.; Tiwari, Anil; Sain, Kalachand; Paul, Ajay

doi:10.1007/s11600-023-01167-5

Artykuł - szczegóły

Tytuł artykułu

One-dimensional regional shear velocity structure from joint inversion of fundamental mode group velocity dispersion measurements of Love and Rayleigh waves: application to the Uttarakhand Himalaya

Autorzy

Gupta Abhishek Kumar , Mandal Prantik , Srinagesh D. , Tiwari Anil , Sain Kalachand , Paul Ajay

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-023-01167-5

Warianty tytułu

Języki publikacji

Abstrakty

Between 2017 and 2019, the CSIR-NGRI, Hyderabad, Telangana, established a broad-band seismic-network with fifty-five 3-component broadband seismometers in the Himalayan region of Uttarakhand, India. Out of 55 three component broadband seismic (BBS) networks, we chose 17 for the present study. Using digital waveform data from twenty-one (21) regional Indian earthquakes of Mw 5.0-6.2 that were recorded in the 17 broadband seismometer, we compute fundamental mode group-velocity dispersion (FMGVD) characteristics of surface waves (Love and Rayleigh waves) and the average one-dimensional regional shear-wave velocity (Vs) structure of the Uttarakhand Himalayan region. First, we compute FMGVD curves for Love waves (6-73 s) and Rayleigh waves (at 6.55-73 s) period, and then, we finally invert these dispersion curves to compute the final average one-dimensional regional crustal & sub-crustal shear-wave velocity (Vs) structure below the Uttarakhand Himalaya. Our best model in Uttarakhand Himalayan region, India, reveals the 8-layered crust with a mid-crustal low velocity layer (MC-LVL) (approximately a drop of 1.5-2.3% in Vs) between 8 and 20 km depth in the proximity of MCT (Main Central Thrust). In the upper crustal part (0-20 km depths), our modelling suggests shear velocities (Vs) varies from 3.1 to 3.9 km/sec while shear velocities (Vs) in the lower crustal part (20-45 km depth) are modelled to be varying from 3.7 to 4.69 km per sec. The Moho-depth is calculated to be 45 km deep below the K-G Himalaya, and the shear-velocity (Vs) in the sub-crustal sector is 4.69 km/sec. Our estimated mid-crustal low-velocity layer (MC-LVL) could be linked to the presence of metamorphic fluids in the fractured Main Himalayan Thrust (MHT), resulting from the weakening of the crustal material at the interface between the overriding Eurasian plate and upper part of the underthrusting Indian plate.

Słowa kluczowe

Main Himalayan thrust group velocity dispersion (GVD) surface waves inversion Moho low-velocity

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2023

Tom

Vol. 71, no. 6

Strony

2619--2632

Opis fizyczny

Bibliogr. 51 poz., rys., tab.

Twórcy

autor

Gupta Abhishek Kumar

Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, 248001, India
CSIR-National Geophysical Research Institute, Hyderabad, 500007, India

autor

Mandal Prantik

CSIR-National Geophysical Research Institute, Hyderabad, 500007, India

autor

Srinagesh D.

CSIR-National Geophysical Research Institute, Hyderabad, 500007, India

autor

Tiwari Anil

anilt@wihg.res.in

Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, 248001, India

autor

Sain Kalachand

Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, 248001, India

autor

Paul Ajay

Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, 248001, India

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-d41ad1e8-f001-46c4-b06d-2281ab8f1762