High-Precision Gravity
Pre-Release Site
Items here may be incomplete, wrong, or obsolete. These are links
for sharing data and results as they come in, and are not maintained or
corrected. Be very careful using these links. Revised and corrected data
and results may be obtained by contacting authors.
Gravity Monitoring Manuals & Software
- Gravity Monitoring Manual - prepared
for the Utah Geological Survey by P. Gettings, 2009.
- Micrograv Software CD - ISO image for
Python-based precision gravity processing software. Includes Python
installers for Windows. Software works on Windows, OS X, Linux, Unix.
Built spring 2009.
Micrograv Software
- micrograv.tgz - gzip'd tar file of the
microgravity reduction package source code. Mostly Python, with a bit
of C++ for terrain correction and fast Tamura ETC calculations. This is
more up-to-date than the CD image, above, but DOES NOT include Windows
installers for Python, Scipy, etc.! Install Python, Scipy, Tk, gnuplot
(optional but recommended) before using this software.
- This software last updated 2013-10-23.
Large Scale & Global Gravity Fields
- EGM2008 free-air anomaly @ 9km AEL
data - gzip'd tarball of ascii files with lon,lat,delta gravity
values, DGG polygon geometry, and a brief description. EGM2008 values
computed using all coefficients to degree & order 2190 (beware
finite precision problems!).
Links for Assignment 3
- wgs2utm.m - convert lat/lon to UTM
- stations - station listing for
exercise
1 acre-foot = 1233.481838 m3
utah-g3d - a simple 3d modeling code
based on rectangular blocks; fast, simple, and theoretically very
parallelizable. Released under the GPL.
download.c - single source file download
program for the CG-3M. Requires an ANSI compiler, and probably only
works on unix; it uses termio/ioctl calls to control the serial port
settings. Developed on Linux. Released under the GPL.
mdownload.c - single source file download
program for a Geometrics 856 magnetometer, and likely other stuff.
Requires an ANSI compiler, and probably only works on unix; it uses
termio/ioctl calls to control the serial port settings. Assumes EOT
ends download file, and can handle 7/8 bits, no parity, and baud rates
from 300-38400. Developed on Linux. Released under the GPL.
Lg linearity measure - Measure of
linearity of drift function. Probably has some previous mathematical
name; if you know it, let me know.
Weber River Basin - just north of Salt Lake City
Weber River Infiltration Monitoring
Nebraska
Dutch Flats, NE project
Salt Lake Valley
Well level plots as PNG images.
Long-term drift at EGI gravity
lab, as PNG images. Note the amplitude of the residual signal!
Base Station Gravity Plot - JPEG, ~800x600
pixels; note the trends maintained with all our data.
EGI is located at:
40.759 N
111.827 W == -111.827 E
Geysers
Paper given at the 2002
Stanford Geothermal Workshop. This version is taken from their
Proceedings CD.
Geysers Map - in Adobe Illustrator 8.0
format; ~142MB in size
Geysers Map - in ArcView 3.0a project
format; gzipped tar archive of project file and GeoTIFF images. 762MB
Notes for field campaigns at The Geysers
Maps, old photos, etc. for field work at The Geysers
Dixie Valley
Dixie Valley Road Map - Postscript, from the
kinematic survey of June '99; has the major roads, and some that really
shouldn't be driven by the faint of heart. Also note that a few roads
were missed in the survey.
TOUGH2 manual, PDF.
General Notes
All of the software available here is written in Python, except where
noted.
This allows for easy cross-platform development and distribution. For
those who don't have or want Python installed, a "frozen" or standalone
version is also available. The frozen version is typically out of
date, and basically untested until the code is actually done. In either
case, the Tk libraries for the target platform are required.
There is no warranty, express or implied, with this software. It is
not guaranteed to do or not do anything. It may work perfectly; it may
cause your computer halt and catch fire.
gettings@mines.utah.edu
