Geophysics & Communications Links – Geologynet
Source: geologynet.com | Original PDF converted and link-corrected, May 2026.
Correction Legend
Yellow highlight = URL repaired or updated to current address
Red highlight = Company defunct / absorbed; successor noted
Geophysics & Communications — Information Resources
Crain’s Petrophysical Handbook
Comprehensive petrophysical well log analysis reference — widely used in petroleum geoscience.
Comprehensive petrophysical well log analysis reference — widely used in petroleum geoscience.
Crustal Magnetic Anomalies — JPL Review Paper
Review paper on crustal magnetic anomalies. Original JPL Technical Report Server no longer resolves.
[Original trs-new.jpl.nasa.gov offline — replaced with NASA NTRS search]
Review paper on crustal magnetic anomalies. Original JPL Technical Report Server no longer resolves.
[Original trs-new.jpl.nasa.gov offline — replaced with NASA NTRS search]
GPS — Introduction to the Global Positioning System
Clear introductory primer on GPS principles and operation — University of Colorado Geography.
Clear introductory primer on GPS principles and operation — University of Colorado Geography.
Geodetic Datums — Introduction
Introduction to geodetic datums and coordinate reference systems — University of Colorado.
Introduction to geodetic datums and coordinate reference systems — University of Colorado.
How to Build a Scintillation Probe
General construction instructions for scintillation probes — Geologynet PDF.
General construction instructions for scintillation probes — Geologynet PDF.
Seismological Laboratory — Caltech
Leading seismological research facility — California Institute of Technology.
Leading seismological research facility — California Institute of Technology.
NOAA National Centers for Environmental Information
Geophysical and environmental data products.
[URL updated: original ngdc.noaa.gov now redirects to NCEI — the successor agency]
Geophysical and environmental data products.
[URL updated: original ngdc.noaa.gov now redirects to NCEI — the successor agency]
USGS Earthquake Hazards — World Seismology Data
Earthquake information, real-time monitoring and historical data — USGS National Earthquake Information Center.
[URL updated to current USGS earthquakes portal]
Earthquake information, real-time monitoring and historical data — USGS National Earthquake Information Center.
[URL updated to current USGS earthquakes portal]
World-Wide Earthquake Locator — University of Edinburgh
Interactive earthquake locator map. Original geo.ed.ac.uk/quakes page no longer resolves.
[Original offline — replaced with USGS real-time earthquake map]
Interactive earthquake locator map. Original geo.ed.ac.uk/quakes page no longer resolves.
[Original offline — replaced with USGS real-time earthquake map]
Geophysical Instruments & Services
ABEM Instruments
Resistivity and seismic systems — Sweden. Domain abem.se no longer resolves.
[Defunct — Guideline Geo acquired ABEM and continues the product lines]
Resistivity and seismic systems — Sweden. Domain abem.se no longer resolves.
[Defunct — Guideline Geo acquired ABEM and continues the product lines]
ASU Thermal Emission Spectrometer
Spectral library and TES instrument data — Arizona State University.
[URL updated: original tes.asu.edu/speclib/ now hosted at speclib.asu.edu]
Spectral library and TES instrument data — Arizona State University.
[URL updated: original tes.asu.edu/speclib/ now hosted at speclib.asu.edu]
Auslog — Geophysical Well Logs
Geophysical well log services — Australia. Domain auslog.com.au no longer resolves.
[Defunct — replaced with Terrain Geophysics, equivalent Australian geophysical services]
Geophysical well log services — Australia. Domain auslog.com.au no longer resolves.
[Defunct — replaced with Terrain Geophysics, equivalent Australian geophysical services]
Electromagnetic Instruments Inc. (EMI)
Electromagnetic mapping instruments — USA. Domain emiinc.com no longer resolves.
[Defunct — replaced with Geonics, equivalent EM mapping instruments, Canada]
Electromagnetic mapping instruments — USA. Domain emiinc.com no longer resolves.
[Defunct — replaced with Geonics, equivalent EM mapping instruments, Canada]
Geonics
Electromagnetic induction instruments for conductivity mapping and mineral exploration — Canada.
Electromagnetic induction instruments for conductivity mapping and mineral exploration — Canada.
GisCo Geophysical Instruments
Magnetometers, electromagnetics and seismographs for geophysical surveys — USA.
Magnetometers, electromagnetics and seismographs for geophysical surveys — USA.
Ludlum Measurements Inc.
Radiation detection instruments and technologies for field and laboratory use.
Radiation detection instruments and technologies for field and laboratory use.
Seismometers — IRIS Seismographs in Schools
School seismometer resources and IRIS seismographs in schools programme.
School seismometer resources and IRIS seismographs in schools programme.
US Radar — Ground Penetrating Radar
Manufacturer and distributor of GPR systems for subsurface investigation.
Manufacturer and distributor of GPR systems for subsurface investigation.
CGG (formerly Veritas DGC)
Geophysical surveying, seismic acquisition and data processing services.
[URL updated: Veritas DGC merged into CGG]
Geophysical surveying, seismic acquisition and data processing services.
[URL updated: Veritas DGC merged into CGG]
WesternGeco (SLB)
Seismic surveying and processing services.
[URL updated: WesternGeco is now a division of SLB]
Seismic surveying and processing services.
[URL updated: WesternGeco is now a division of SLB]
Communications Equipment
Minecom — Underground Communications
Underground communications systems for mines — Australia. Domain minecom.com.au no longer resolves.
[Defunct — replaced with Strata-G, equivalent underground mine communications, Australia]
Underground communications systems for mines — Australia. Domain minecom.com.au no longer resolves.
[Defunct — replaced with Strata-G, equivalent underground mine communications, Australia]
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