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Philip J. Brown

A Geophysicist having over 25 years experience with geophysical operations, multidisciplinary geophysical data processing, joint earth-science data inversion and interpretation, software development and documentation, geodetic positioning, GIS, data base architecture, as well as engineering and repairing acquisition hardware.  Currently develop and administer cloud- and web-based solutions fo

  • Geophysical and petrophysical technical expertise regarding ground-based, offshore, airborne, wire-line, and Measurement-While-Drilling (MWD) exploration tools utilizing multi-component (full tensor) -seismic, -potential-field, -electrical, and nuclear methods.
  • Joint inversion and geologic interpretation of geophysical and petrophysical multi-dimensional data employing novel non-linear statistical methods and data-driven techniques. 
  • Interactive development environment (IDE) experience with Microsoft Visual Studio (VS), Eclipse, Jupyter, VS Code, and KDevelop.
  • Data Base, GIS Development, and Content Management using C++, Visual Basic, JavaScript, Python, MySQL, phpMyAdmin, Joomla, WordPress, Drupal, ArcGIS Online, Oasis montaj, JSON, XML, HTML, CSS, Google Application Scripting (GAS), ScienceBase API, USGS Publications Warehouse API, USGS Metadata Wizard API, USGS Active Directory API, and Amazon Web Services (AWS).
  • Earth Science related, object-oriented software development using GitHub, C++, Visual Basic, JavaScript, Python, Fortran, R, IDL, SQL, PHP, HTML, XML, CSS, DOS Script, LabView, MatLab, and Geosoft Oasis montaj GX/OMS.
  • Light-Client and Web Development using HTML, PHP, JavaScript, CSS, XML, Joomla, WordPress, Drupal, USGS CMS, JSON, and Adobe Creative Design Suite. 
  • Computing platform application development for 32- and 64- bit MS Windows NT, 2000, 2002, XP, 7 and 10; Cygwin; Macintosh OS-X; Linux Gnome, K, and Ubuntu Desktops; Unix X-Windows; NEXT; DOS; VMS/VAX; as well as various proprietary and/or hand-held systems including real-time computing hardware used for data acquisition.
  • Land Surveying, Down-Hole Directional Surveying, and Real-Time Kinematic (RTK) Differential Global Positioning Systems (GPS).  Blue Marble type visualizations.

Science and Products

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Image shows an Alaskan Mountain viewed through hyperspectral imaging

Data Management and Spatial Studies - GGGSC

We provide support for geospatial analyses, mobile field data collection, management of geospatial collections including documentation, and distribution of all dataset types (geophysical, geochemistry, remote sensing (hyperspectral), etc.). GIS and data management support are provided including hyperspectral and geophysical studies that improve capabilities and applications for investigating...
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
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Data Management and Spatial Studies - GGGSC

We provide support for geospatial analyses, mobile field data collection, management of geospatial collections including documentation, and distribution of all dataset types (geophysical, geochemistry, remote sensing (hyperspectral), etc.). GIS and data management support are provided including hyperspectral and geophysical studies that improve capabilities and applications for investigating...
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USGS science for a changing world

Mineral Resource Assessment Training

The USGS Mineral Resources Program conducts mineral resource assessments and is training USGS scientists in how to conduct these assessments for future work. As a practical exercise, the scientists will conduct an assessment for tungsten in the U.S.
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Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
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Mineral Resource Assessment Training

The USGS Mineral Resources Program conducts mineral resource assessments and is training USGS scientists in how to conduct these assessments for future work. As a practical exercise, the scientists will conduct an assessment for tungsten in the U.S.
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Filter Total Items: 19

Magnetotelluric sounding data across the Idaho Batholith, Payette National Forest, Idaho, 1989

This dataset includes the magnetotelluric (MT) sounding data collected in 1989 across the Idaho Batholith, Payette National Forest, Idaho, by the U.S. Geological Survey (USGS). The primary focus is on geologic elements that relate to the Late Cretaceous Idaho batholith geometry and the development of the Yellow Pine mining district and Stibnite mining area. Twenty MT soundings along one 110-km lon
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Airborne magnetic and radiometric survey of the Wet Mountains and surrounding region, Custer and Fremont Counties, south-central Colorado, 2021

This data release provides digital flight-line and gridded data for a high-resolution airborne magnetic and radiometric survey over the region surrounding the Wet Mountains of southern Colorado, including parts of Custer and Fremont Counties. Data for this survey were collected by Sander Geophysics Limited International (SGL) under contract with the USGS. The survey was flown in June and July of 2
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990

The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994.
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Geology, Geophysics, and Geochemistry Science Center

Airborne Magnetic Survey, Michigan Upper Peninsula Area, 2008

This publication provides digital flight line data for a high-resolution magnetic survey over an area of the west-central Upper Peninsula of Michigan. The survey was flown in 2008 by Aeroquest under contract to Kennecott Eagle Minerals Company using a fixed-wing aircraft with a magnetometer mounted in a tail stinger. The USGS has obtained this 66,074 line km subset of the survey dataset for public
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Geology, Geophysics, and Geochemistry Science Center

Airborne magnetic survey over northeast North Dakota, 2000-2001

This data release is a re-release of an airborne geophysical survey carried out for the United States Geological Survey (USGS) by Spectra Exploration Geoscience Corp., from November 2000 to February 2001. The purpose of this survey was to acquire high-resolution, high-sensitivity aeromagnetic data over an area in northeast and north-central North Dakota and assess the area for anomalies and magnet
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

Spatial data associated with tungsten skarn resource assessment of the Northern Rocky Mountains, Montana and Idaho

A mineral resource assessment was performed by the U.S. Geological Survey (USGS) to assess the potential of undiscovered skarn-hosted tungsten resources in the Northern Rocky Mountain region of eastern Idaho and western Montana. This region has seen moderate tungsten trioxide (WO3) production in the past from a variety of mineralization styles including skarn, vein and replacement, and wolframite-
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Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Qualitative Mineral Potential Map of Tungsten Skarn in the Yukon-Tanana Uplands, Eastern Alaska, USA, 2021

This data release supports the paper titled, "Tungsten skarn potential of the Yukon-Tanana Uplands, Eastern Alaska, USA-A mineral resource assessment", published via open-access license in the Journal of Geochemical Exploration and available at: https://doi.org/10.1016/j.gexplo.2020.106700. The data release includes GIS data that map potential for tungsten skarn mineralization in permissive tracts
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Alaska Science Center

Audiomagnetotelluric sounding data in the Silverton Caldera complex, Colorado, 2019

This dataset includes audiomagnetotelluric (AMT) sounding data collected in July 2019 in the Silverton Caldera complex, Colorado, in the Southern Rocky Mountain Volcanic Field, by the U.S. Geological Survey (USGS). Along with geologic mapping, airborne magnetics, airborne electromagnetics, and magnetotellurics, the USGS collected AMT data at 26 sites along five profiles ranging from 2 to 5 kilomet
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Magnetotelluric sounding data in the Silverton Caldera complex, Colorado, 2019

This dataset includes magnetotelluric (MT) sounding data collected in July 2019 in the Silverton Caldera complex, Colorado, in the Southern Rocky Mountain Volcanic Field, by the U.S. Geological Survey (USGS). Along with geologic mapping, airborne magnetics, airborne electromagnetics, and audiomagnetotellurics, the USGS collected MT data at 24 sites along five profiles ranging from 2 to 5 kilometer
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Airborne magnetic survey, Iron Mountain-Chatham region, central Upper Peninsula, Michigan, 2018

This publication provides digital flight line data for a high-resolution magnetic survey over an area of the central Upper Peninsula of Michigan. The survey area lies approximately between the towns of Iron Mountain and Chatham. Data for this survey were collected by EON Geosciences under contract with the USGS using a fixed wing aircraft with a magnetometer mounted in the tail stinger. The survey
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Airborne magnetic and radiometric survey over northwest Arkansas, 2019-2020

This publication provides digital flight line data for a high-resolution magnetic and radiometric survey over an area of northwest Arkansas. The airborne geophysical survey was jointly funded by the USGS National Cooperative Geologic Mapping Program and the Earth Mapping Resource Initiative and was designed to meet the complimentary needs related to geologic mapping and mineral resource research.
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National Cooperative Geologic Mapping Program, Geology, Geophysics, and Geochemistry Science Center

Audiomagnetotelluric survey to characterize the Sunnyside porphyry copper system in the Patagonia Mountains, Arizona

This dataset includes audiomagnetotelluric (AMT) sounding data collected in 2008 in and near the Patagonia Mountains of southern Arizona. The U.S. Geological Survey (USGS) conducted a series of multidisciplinary studies as part of the Assessment Techniques for Concealed Mineral Resources project funded by the USGS Minerals Resources Program in cooperation with the U.S. Forest Service. The USGS use
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Geology, Geophysics, and Geochemistry Science Center
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Filter Total Items: 13

Tungsten resources of the northern Rocky Mountains, Montana and Idaho— A synthesis and quantitative assessment of skarn-hosted resources

Mineral resource assessments performed by the U.S. Geological Survey provide a synthesis of available information about the location of known and suspected mineral deposits. This study focuses on skarn-hosted tungsten resources in the northern Rocky Mountain region of east-central Idaho and western Montana which have seen moderate tungsten trioxide production in the past from a variety of minerali
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Allen K. Andersen, Margaret A. Goldman, Mitchell M. Bennett, Connie L. Dicken, Philip J. Brown, Heather L. Parks
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Geology, Minerals, Energy, and Geophysics Science Center

Tungsten skarn potential of the Yukon-Tanana Upland, eastern Alaska, USA—A mineral resource assessment

Tungsten (W) is used in a variety of industrial and technological applications and has been identified as a critical mineral for the United States, India, the European Union, and other countries. These countries rely on W imports mostly from China, which leaves them vulnerable to supply disruption. Consequently, the U.S. government has a current initiative to understand domestic resource potential
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George N. D. Case, Garth E. Graham, Erin E. Marsh, Ryan Taylor, Carlin J. Green, Philip J. Brown, Keith A. Labay
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Mineral Resources Program, Geology, Energy & Minerals Science Center, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center

Geophysical, geochemical, and mineralogical data from the Pebble Cu-Au-Mo porphyry deposit area, southwest Alaska: Contributions to assessment techniques for concealed mineral resources

In 2007, the U.S. Geological Survey began a multidisciplinary study in southwest Alaska to investigate the setting and detectability of mineral deposits in concealed volcanic and glacial terranes. The study area hosts the world-class Pebble porphyry Cu-Au-Mo deposit, and through collaboration with the Pebble Limited Partnership, a range of geophysical and geochemical investigations was carried out
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E. D. Anderson, S. M. Smith, S. A. Giles, Matthew Granitto, R. G. Eppinger, P. A. Bedrosian, A. K. Shah, K. D. Kelley, D. L. Fey, B. J. Minsley, P. J. Brown
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Geology, Minerals, Energy, and Geophysics Science Center, Geology, Geophysics, and Geochemistry Science Center

Regional magnetic domains of the Circum-Arctic: A framework for geodynamic interpretation

We identify and discuss 57 magnetic anomaly pattern domains spanning the Circum-Arctic. The domains are based on analysis of a new Circum-Arctic data compilation. The magnetic anomaly patterns can be broadly related to general geodynamic classification of the crust into stable, deformed (magnetic and nonmagnetic), deep magnetic high, oceanic and large igneous province domains. We compare the magne
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R. W. Saltus, E. L. Miller, C. Gaina, P. J. Brown

A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean

The Lomonosov microcontinent is an elongated continental fragment that transects the Arctic Ocean between North America and Siberia via the North Pole. Although it lies beneath polar pack ice, the geological framework of the microcontinent is inferred from sparse seismic reflection data, a few cores, potential field data and the geology of its conjugate margin in the Barents–Kara Shelf. Petroleum
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Thomas E. Moore, Arthur Grantz, Janet K. Pitman, Philip J. Brown
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Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Aeromagnetic survey of Howard Pass quadrangle and the East half of Misheguk Mountain quadrangle, Alaska—a Web site for the distribution of data

U.S. Geological Survey Open-File-Report 2009-1256 is for the preliminary release of magnetic data (and associated contractor reports) for an airborne survey in the Brooks Range, northwest of Bettles, Alaska.
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Philip J. Brown
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Geology, Minerals, Energy, and Geophysics Science Center, Geology, Geophysics, and Geochemistry Science Center

2006 Compilation of Alaska Gravity Data and Historical Reports

Gravity anomalies provide fundamental geophysical information about Earth structure and dynamics. To increase geologic and geodynamic understanding of Alaska, the U.S. Geological Survey (USGS) has collected and processed Alaska gravity data for the past 50 years. This report introduces and describes an integrated, State-wide gravity database and provides accompanying gravity calculation tools to a
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Richard W. Saltus, Philip J. Brown, Robert L. Morin, Patricia L. Hill

Aeromagnetic survey of Dillingham area in southwest Alaska, a website for the preliminary distribution of data

An airborne high-resolution magnetic survey was completed over the Dillingham and Nushagak Bay and Naknek area in southwestern Alaska. The flying was undertaken by McPhar Geosurveys Ltd. on behalf of the United States Geological Survey (USGS). First tests and calibration flights were completed by August 26th, 2005 and data acquisition was initiated on September 1st, 2005. The final data acquisitio
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Reducing tensor magnetic gradiometer data for unexploded ordnance detection

We performed a survey to demonstrate the effectiveness of a prototype tensor magnetic gradiometer system (TMGS) for detection of buried unexploded ordnance (UXO). In order to achieve a useful result, we designed a data-reduction procedure that resulted in a realistic magnetic gradient tensor and devised a simple way of viewing complicated tensor data, not only to assess the validity of the final r
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Robert E. Bracken, Philip J. Brown

Calibrating a tensor magnetic gradiometer using spin data

Scalar magnetic data are often acquired to discern characteristics of geologic source materials and buried objects. It is evident that a great deal can be done with scalar data, but there are significant advantages to direct measurement of the magnetic gradient tensor in applications with nearby sources, such as unexploded ordnance (UXO). To explore these advantages, we adapted a prototype tensor
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Robert E. Bracken, David V. Smith, Philip J. Brown

Aeromagnetic surveys in Yukon Flats Alaska, a website for the distribution of data

No abstract available.
Authors
Philip J. Brown

Directional borehole radar tests of an oil injection experiment at the Colorado School of Mines, Golden, Colorado

In October 2001, the U.S. Geological Survey conducted borehole radar surveys of an oil injection experiment at the Colorado School of Mines (CSM), in Golden Colorado using the prototype U.S. Geological Survey (USGS)-developed directional borehole radar system (DBOR). A explanation of the system can be found in Wright and others (2001). The USGS was invited to the CSM to deploy the prototype direct
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Jared D. Abraham, Craig Moulton, Philip J. Brown

Science and Products