i.gravity - GRASS GIS manual

Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.

NAME

i.gravity - Bouguer gravity anomaly computation (full slab).

KEYWORDS

imagery, gravity, Bouguer, Eotvos, Free Air

SYNOPSIS

i.gravity

i.gravity --help

i.gravity gravity_obs=name elevation=name latitude=name flight_azimuth=name flight_velocity=name slab_density=name terrain_corr=name output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

--overwrite: Allow output files to overwrite existing files
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

gravity_obs=name [required]: Name of the observed gravity map [mGal]; Default: gravity_obs
elevation=name [required]: Name of the elevation map [m]; Default: dem
latitude=name [required]: Name of the latitude map [dd.ddd]; Default: lat
flight_azimuth=name [required]: Name of the flight azimuth map (clockwise from North) [dd.ddd]; Default: flight_azimuth
flight_velocity=name [required]: Name of the flight velocity [kph]; Default: flight_velocity
slab_density=name [required]: Name of the slab density [kg/m3]; Default: slab_density
terrain_corr=name [required]: Name of the terrain correction map []; Default: terrain_corr
output=name [required]: Name of the Bouguer gravity anomaly [mGal]

DESCRIPTION
NOTES
SEE ALSO
REFERENCES
AUTHORS

DESCRIPTION

i.gravity calculates the Bouguer gravity anomaly (after Mussett and Khan).
Bouguer anomaly computation require:

g_obs=observed gravity
freeair_corr=free air correction
bouguer_corr=bouguer correction
terrain_corr=terrain correction
latitude_corr=latitude correction
eotvos_corr=eotvos correction

NOTES

International Gravity Formula (mGal), lambda=latitude (dd)
Eotvos correction (mGal), v=velocity (kph), lambda=latitude (dd), alpha=direction of travel measured clockwise from North
Free air Correction (mGal), h=height (m)
Bouguer Correction (mGal), rho=density of slab (Mg/m3), h=height (m)

For more details on the algorithms see [1].

REFERENCES

[1] Mussett, A.E. and Khan, M.A, M.A. Looking into the Earth: An Introduction to Geological Geophysics.

AUTHORS

Yann Chemin, University of London at Birkbeck, United Kingdom.

SOURCE CODE

Available at: i.gravity source code (history)

Latest change: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55