Big Sky Geophysics is a consulting
and contracting company located in Bozeman, Montana. I operate
the company as a sole proprietor. I have been working as a geophysicist
for over twenty years and both execute field work and perform
survey planning, processing, and interpretation. I have worked
throughout North and Central America and in Africa on projects
ranging is scope from one day engineering surveys to multiyear
follow ups of airborne surveys. I use potential field (gravity
and magnetics), electrical/EM, seismic and radiometric methods
for applications in mineral exploration, hydrocarbon exploration,
and engineering studies.
I believe in using the best equipment
possible for collecting, processing, and interpreting geophysical
data. I use a large variety of computer programs including:
Geosoft Oasis Montaj potential field mapping
and processing software
EMIT Maxwell EM processing
and modeling software
Geotomo's resistivity/induced
polarization modeling and smooth model inversion software based
upon the code of Loke
Allen Cogbill's gravity terrain
correction software
Encom Technology's ModelVision
gravity and magnetic modeling software using prisms
NGA GM-SYS gravity and magnetic
modeling software using prisms
UBC's GRAV3D and MAG3D 3D
smooth model inversion software for gravity and magnetic data
Kansas Geological
Survey MASW (surface wave) and seismic refraction processing
software
SU seismic/ground penetrating
radar reflection processing software
ArcView GIS software
Golden Software's Didger
digitizing program and Voxler 3D rendering program
Numerous public domain, commercial, and personal programs written
in FORTRAN, C, and BASIC for formatting and processing various
geophysical data types.
I am gradually acquiring all
of the field gear necessary to perform surveys. At the present
time I own:
Potential Fields:
LaCoste and Romberg G model gravimeter with electrostatic readout
Trimble 5700 survey grade (centimeter
level accuracy) GPS base/rover pair with RTK and post processing
options
GEM GSM-19W Overhauser walking magnetometer/gradiometer
GEM GSM-19TG proton precession walking
magnetometer/gradiometer
Electrical/Electromagnetic:
Time Domain resistivity/induced polarization (IP)
EMIT SMARTem24 multifunction
receiver (8 channel, 24 bit A/D)
Walcer KW10 10 kVA time
domain transmitter
Walcer MG-12A 12 kW 400
Hz motor generator
Iris Instruments VIP3000
3 kVA transmitter
Honda 5 kW 60 Hz motor generator
Time Domain Electromagnetics (EM)
EMIT SMARTem24 multifunction
receiver (8 channel, 24 bit A/D) with transmitter controller
Crone Geophysics 30A transmitter
system and Crone receiver coil
Trimble ProXRT (sub meter accuracy)
GPS receiver
Frequency Domain EM
Apex Parametrics Max-Min II+ EM induction system (222, 444, 888,
1777, 3555 Hz) with digital storage
Apex Parametrics Max-Min II EM induction system (222, 444, 888,
1777, 3555 Hz, analogue)
Geonics VLF receiver (approximately
20 kHz range) with resistivity option
Mala Geoscience
Easy Locator 450 MHz ground penetrating radar
Seismic:
Geometrics 48 channel seismic
system (2 24 channel Geodes, 24 bit A/D)
4.5 Hz, 8 Hz, and 100 Hz geophones for MASW, refraction and reflection
surveys
16 lb. sledge hammer source
Bison AWGIII 550 lb. accelerated weight drop mounted on trailer
Radiometric:
Geofyzika GS-512 gamma ray
spectrometer (modern with digital storage) with large (3")
external crystal
Exploranium GR110 gamma ray scintillometer
If you feel I may be able to
help you with a project, please contact me. I enjoy both field
work and processing/interpretations and will work to incorporate
any geophysical planning and results with additional data such
as geologic mapping and well logs, geochemical sampling, and
existing water table information. If you wish to have additional
information about my experience and education, I have provided
my resume. I am pretty fluent in Russian
and German and speak some Spanish. I encourage you to consult
the case studies. I also discuss some of the advantages and potential
pitfalls of using GPS positioning systems
with geophysical surveys.
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