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
Filter Total Items: 27
Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023 Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023
Gravity data were collected in 2022 and 2023 to assist in mapping surface and subsurface geology in the central Upper Peninsula of Michigan. This data release provides principal facts for 666 new gravity stations that were acquired to supplement existing public gravity data coverage.
Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022 Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022
The U.S. Geological Survey (USGS) collected rock physical property measurements to help understand causative sources of gravity and magnetic survey anomalies in the central Upper Peninsula of Michigan. A total of 1,460 measurements of magnetic susceptibility and density from 61 outcrops and 37 boreholes have been conducted on Precambrian rocks. The measurements aid in interpretation of...
Magnetotelluric sounding data across the Idaho Batholith, Payette National Forest, Idaho, 1989 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...
Airborne magnetic and radiometric survey of the Wet Mountains and surrounding region, Custer and Fremont Counties, south-central Colorado, 2021 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...
Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990 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...
Airborne Magnetic Survey, Michigan Upper Peninsula Area, 2008 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...
Filter Total Items: 21
Aeromagnetic survey of Howard Pass quadrangle and the East half of Misheguk Mountain quadrangle, Alaska—a Web site for the distribution of data 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.
Authors
Philip J. Brown
2006 Compilation of Alaska gravity data and historical reports 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...
Authors
Richard W. Saltus, Philip J. Brown, Robert L. Morin, Patricia L. Hill
Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008 Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008
The U.S. Geological Survey (USGS) recently assessed the undiscovered oil and gas potential of the West Greenland-East Canada Province as part of the USGS Circum-Arctic Oil and Gas Resource Appraisal effort. The West Greenland-East Canada Province is essentially the offshore area between west Greenland and east Canada and includes Baffin Bay, Davis Strait, Lancaster Sound, and Nares...
Authors
Christopher J. Schenk, Kenneth J. Bird, Philip J. Brown, Ronald R. Charpentier, Donald L. Gautier, David W. Houseknecht, Timothy R. Klett, Mark J. Pawlewicz, Anjana Shah, Marilyn E. Tennyson
Aeromagnetic survey of Dillingham area in southwest Alaska, a website for the preliminary distribution of data 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
Authors
Water Resources Division U.S. Geological Survey
Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona
On March 12, 2003, data were gathered at Yuma Proving Grounds, in Arizona, using a Tensor Magnetic Gradiometer System (TMGS). This report shows how these data were processed and explains concepts required for successful TMGS data reduction. Important concepts discussed include extreme attitudinal sensitivity of vector measurements, low attitudinal sensitivity of gradient measurements...
Authors
Robert E. Bracken, Philip J. Brown
Calibrating a tensor magnetic gradiometer using spin data 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...
Authors
Robert E. Bracken, David V. Smith, Philip J. Brown
Science and Products
Filter Total Items: 27
Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023 Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023
Gravity data were collected in 2022 and 2023 to assist in mapping surface and subsurface geology in the central Upper Peninsula of Michigan. This data release provides principal facts for 666 new gravity stations that were acquired to supplement existing public gravity data coverage.
Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022 Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022
The U.S. Geological Survey (USGS) collected rock physical property measurements to help understand causative sources of gravity and magnetic survey anomalies in the central Upper Peninsula of Michigan. A total of 1,460 measurements of magnetic susceptibility and density from 61 outcrops and 37 boreholes have been conducted on Precambrian rocks. The measurements aid in interpretation of...
Magnetotelluric sounding data across the Idaho Batholith, Payette National Forest, Idaho, 1989 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...
Airborne magnetic and radiometric survey of the Wet Mountains and surrounding region, Custer and Fremont Counties, south-central Colorado, 2021 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...
Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990 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...
Airborne Magnetic Survey, Michigan Upper Peninsula Area, 2008 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...
Filter Total Items: 21
Aeromagnetic survey of Howard Pass quadrangle and the East half of Misheguk Mountain quadrangle, Alaska—a Web site for the distribution of data 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.
Authors
Philip J. Brown
2006 Compilation of Alaska gravity data and historical reports 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...
Authors
Richard W. Saltus, Philip J. Brown, Robert L. Morin, Patricia L. Hill
Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008 Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008
The U.S. Geological Survey (USGS) recently assessed the undiscovered oil and gas potential of the West Greenland-East Canada Province as part of the USGS Circum-Arctic Oil and Gas Resource Appraisal effort. The West Greenland-East Canada Province is essentially the offshore area between west Greenland and east Canada and includes Baffin Bay, Davis Strait, Lancaster Sound, and Nares...
Authors
Christopher J. Schenk, Kenneth J. Bird, Philip J. Brown, Ronald R. Charpentier, Donald L. Gautier, David W. Houseknecht, Timothy R. Klett, Mark J. Pawlewicz, Anjana Shah, Marilyn E. Tennyson
Aeromagnetic survey of Dillingham area in southwest Alaska, a website for the preliminary distribution of data 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
Authors
Water Resources Division U.S. Geological Survey
Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona
On March 12, 2003, data were gathered at Yuma Proving Grounds, in Arizona, using a Tensor Magnetic Gradiometer System (TMGS). This report shows how these data were processed and explains concepts required for successful TMGS data reduction. Important concepts discussed include extreme attitudinal sensitivity of vector measurements, low attitudinal sensitivity of gradient measurements...
Authors
Robert E. Bracken, Philip J. Brown
Calibrating a tensor magnetic gradiometer using spin data 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...
Authors
Robert E. Bracken, David V. Smith, Philip J. Brown