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Fundamental mode Rayleigh wave group velocity dispersion data

Cite this dataset

Mitra, Supriyo; Ghosh, Monumoy; Dey, Siddharth (2024). Fundamental mode Rayleigh wave group velocity dispersion data [Dataset]. Dryad. https://doi.org/10.5061/dryad.bzkh189c2

Abstract

Fundamental-mode Rayleigh-wave group-velocity dispersion curves have been computed from 14706 regional waveforms (ray-paths) sampling India, Himalaya, Tibet and surrounding regions. These have been combined through ray-based travel-time tomography to compute 2D group-velocity maps at periods between 10 and 120~s. These ray-paths sample the region with unprecedented density and uniformity. The 2D maps have a lateral resolution of 3\deg x3\deg, comparable to the regional geology. The dispersion curves, at each 1\deg\ spaced node-points, are inverted to obtain a 3D isotropic shear-wave velocity structure.

README

This archive contains:

  1. Earthquake waveform data used to compute the Rayleigh-wave (LR) fundamental-mode group-velocity dispersion
  2. The computed dispersion files which have been used for performing the tomography (2D LR maps)

  1. LR_waveform_2022.tgz - Waveform data

To extract (on linux):
$ tar xvzf LR_waveform_2022.tgz
$ cd LR_waveform_2022

Extracts as LR_waveform_2022/IISERK_Data
cut_v_2011221115022_IT_YUMT.BHZ.xy
cut_v_2015325001543_IK_WANI.BHZ.xy

LR_waveform_2022/INCOIS_Data
cut_v_2008269014711_IM_KUDL.BHZ.xy
cut_v_2012102104310_IM_SHL.HHZ.xy

LR_waveform_2022/IRIS_Data
cut_v_2005088061613_G_HYB.BHZ.xy
cut_v_2009222195539_XW_GHDI.BHZ.xy

Total of 14706 waveform data files (corresponding to the earthquake-station raypaths)

File Format: ASCII XY file
Column-1: Time
Column-2: ground velocity amplitude in m/s

File name convention:
cut_velocity-trace_event-ID_Network-code_Station-code.Component.xy

e.g. cut_v_2010105142637_IT_CHTG.BHZ.xy
cut: waveform is windowed for the LQ fundamental-mode used for the analysis
MFA: Multiple Filter Analysis is the procedure used for extraction of the dispersion curve
v: velocity-trace
2010105142637: event-ID [Origin time of event e.g. year(2010)julian-day(105)hour(14)minute(26)second(37)]
IT: Network-code
CHTG: Station-code
BHZ: Vertical Component


  1. LR_dispersion_2022.tgz - Dispersion data

To extract (on linux):
$ tar xvzf LR_dispersion_2022.tgz
$ cd LR_dispersion_2022.tgz

Extracts as LR_dispersion_2022
2018333202144_IU_CHTO_BHZ.dat
2011261124051_IM_BKN_HHZ.dat

File name convention:
event-ID_Network-code_Station-code_Component.dat

eg. 2018333202144_IU_CHTO_BHZ.dat
event-ID: 2018333202144
Network-code: IU
Station-code: CHTO
Component: BHZ

Data format (3 columns):
period group-velocity group-velocity-error

eg.
44 2.75948 0.22519
42 2.75374 0.21406
40 2.74863 0.20311


Updated: 20/06/2024

Methods

Waveform data was collected through field experiment. These have been processed using the multiple filter technique to extract group velocity dispersion curves. 

Funding

Indian Institute of Science Education and Research Kolkata