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Darcy K. McPhee, PhD.

Darcy McPhee is the Program Manager for the Earth Mapping Resources Initiative in the Mineral Resources Program in Reston, VA.

Science and Products

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Renewing the National Cooperative Geologic Mapping Program as the Nation’s authoritative source for modern geologic knowledge

This document presents the renewed vision, mission, and goals for the National Cooperative Geologic Mapping Program (NCGMP). The NCGMP, as authorized by the National Cooperative Geologic Mapping Act of 1992 (Public Law 102-285, 106 Stat. 166 and its reauthorizations), is tasked with expediting the production of a geologic database for the Nation based on modern geologic maps and their supporting d
Authors
John Brock, Karen Berry, James Faulds, Richard Berg, Kyle House, Michael Marketti, Darcy McPhee, Kevin M. Schmidt, James Schmitt, David R. Soller, David Spears, Ren A. Thompson, Harvey Thorleifson, Gregory J. Walsh
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National Cooperative Geologic Mapping Program, Geosciences and Environmental Change Science Center

U.S. Geological Survey STATEMAP Program—Geologic mapping for the public good

As of 2020, STATEMAP has invested more than $150 million in 48 State geological surveys, matched dollar for dollar, to complete geologic mapping projects crucial to the health and security of State natural resources and residents. For more information about STATEMAP and other geologic mapping efforts supported by the National Cooperative Geologic Mapping Program, visit https://ncgmp.usgs.gov.
Authors
Abby Ackerman, Darcy McPhee
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Natural Hazards Mission Area, National Cooperative Geologic Mapping Program

U.S. Geological Survey EDMAP Program—Training the next generation of geologic mappers

Detailed geologic maps are the basis of nearly every Earth-science investigation and can be used for natural hazard mitigation, resource identification and exploration, infrastructure planning, and more. A component of the congressionally mandated National Cooperative Geologic Mapping Program, EDMAP is a partnership among the U.S. Geological Survey, the Association of American State Geologists, an
Authors
Abby Ackerman, Darcy McPhee
By
Natural Hazards Mission Area, National Cooperative Geologic Mapping Program

Santa Rosa's past and future earthquakes

Santa Rosa is no stranger to earthquakes. This northern California city was damaged several times in the late 19th and early 20th centuries by shaking from earthquakes, culminating in the devastating earthquake of 1906, whose rupture passed 20 miles to the west of the city on the San Andreas Fault. Then in 1969, Santa Rosa was again strongly shaken and buildings were damaged by a pair of nearby, m
Authors
Suzanne Hecker, Darcy K. McPhee, Victoria E. Langenheim, Janet T. Watt
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Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Three-dimensional electrical resistivity model of the hydrothermal system in Long Valley Caldera, California, from magnetotellurics

Though shallow flow of hydrothermal fluids in Long Valley Caldera, California, has been well studied, neither the hydrothermal source reservoir nor heat source has been well characterized. Here a grid of magnetotelluric data were collected around the Long Valley volcanic system and modeled in 3-D. The preferred electrical resistivity model suggests that the source reservoir is a narrow east-west e
Authors
Jared R. Peacock, Margaret T. Mangan, Darcy McPhee, Phil E. Wannamaker
By
Energy and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Geology, Minerals, Energy, and Geophysics Science Center

Imaging the magmatic system of Mono Basin, California with magnetotellurics in three--dimensions

A three–dimensional (3D) electrical resistivity model of Mono Basin in eastern California unveils a complex subsurface filled with zones of partial melt, fluid–filled fracture networks, cold plutons, and regional faults. In 2013, 62 broadband magnetotelluric (MT) stations were collected in an array around southeastern Mono Basin from which a 3D electrical resistivity model was created with a resol
Authors
Jared R. Peacock, Margaret T. Mangan, Darcy McPhee, David A. Ponce
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Energy and Minerals Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Summer of Applied Geophysical Experience (SAGE): Training for our future geoscientists

Energy and natural resources are crucial to the sustainability of worldwide economies, security, and overall well-being. However, the future workforce in the energy and natural-resources sector is at risk, and meeting the challenges of this dwindling workforce requires well-educated geoscientists in exploration and applied geophysics and related geoscience and technology disciplines. Programs such
Authors
W. S. Baldridge, Paul A. Bedrosian, Shawn Biehler, L.W. Braile, John Ferguson, Matthew Folsom, G.R. Jiracek, Shari A. Kelley, Darcy McPhee, Louise Pellerin, Catherine M. Snelson
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Geology, Geophysics, and Geochemistry Science Center

Eruptions at Lone Star geyser, Yellowstone National Park, USA: 2. Constraints on subsurface dynamics

We use seismic, tilt, lidar, thermal, and gravity data from 32 consecutive eruption cycles of Lone Star geyser in Yellowstone National Park to identify key subsurface processes throughout the geyser's eruption cycle. Previously, we described measurements and analyses associated with the geyser's erupting jet dynamics. Here we show that seismicity is dominated by hydrothermal tremor (~5–40 Hz) attr
Authors
Jean Vandemeulebrouck, Robert A. Sohn, Maxwell L. Rudolph, Shaul Hurwitz, Michael Manga, Malcolm J.S. Johnston, S. Adam Soule, Darcy McPhee, Jonathan M. G. Glen, Leif Karlstrom, Fred Murphy
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Water Resources Mission Area, Natural Hazards Mission Area, Volcano Hazards Program, Volcano Science Center

Structural controls on geothermal circulation in Surprise Valley, California: A re-evaluation of the Lake City fault zone

Faults and fractures play an important role in the circulation of geothermal fluids in the crust, and the nature of that role varies according to structural setting and state of stress. As a result, detailed geologic and geophysical mapping that relates thermal springs to known structural features is essential to modeling geothermal systems. Published maps of Surprise Valley in northeastern Califo
Authors
Anne E. Egger, Jonathan M.G. Glen, Darcy McPhee
By
Energy and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Tectonic evolution of the Tualatin basin, northwest Oregon, as revealed by inversion of gravity data

The Tualatin basin, west of Portland (Oregon, USA), coincides with a 110 mGal gravity low along the Puget-Willamette lowland. New gravity measurements (n = 3000) reveal a three-dimensional (3-D) subsurface geometry suggesting early development as a fault-bounded pull-apart basin. A strong northwest-trending gravity gradient coincides with the Gales Creek fault, which forms the southwestern boundar
Authors
Darcy McPhee, Victoria E. Langenheim, Ray Wells, Richard J. Blakely
By
Energy and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Geology, Minerals, Energy, and Geophysics Science Center

Geophysical investigations of the geologic and hydrothermal framework of the Pilgrim Springs Geothermal Area, Alaska

Pilgrim Hot Springs, located on the Seward Peninsula in west-central Alaska, is characterized by hot springs, surrounding thawed regions, and elevated lake temperatures. The area is of interest because of its potential for providing renewable energy for Nome and nearby rural communities. We performed ground and airborne geophysical investigations of the Pilgrim Springs geothermal area to identify
Authors
Jonathan M.G. Glen, Darcy McPhee, Paul A. Bedrosian
By
Energy and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Superimposed extension and shortening in the southern Salinas Basin and La Panza Range, California: A guide to Neogene deformation in the Salinian block of the central California Coast Ranges

We synthesized data from geologic maps, wells, seismic-reflection profiles, potential-field interpretations, and low-temperature thermochronology to refine our understanding of late Cenozoic extension and shortening in the Salinian block of the central California Coast Ranges. Data from the La Panza Range and southern Salinas Basin document early to middle Miocene extension, followed by Pliocene a
Authors
Joseph Colgan, Darcy McPhee, Kristin McDougall, Jeremy K. Hourigan
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GLGMC Representation Thumb

Great Lakes Geologic Mapping Coalition (GLGMC)

The Great Lakes Geologic Mapping Coalition (GLGMC) advances the understanding of the three-dimensional distribution of the glacial, periglacial, and proglacial deposits that overlie the bedrock of the glaciated Midwest. It recognizes the fact that several continental glaciations of the last million years have profoundly affected the geology and the natural environment of all eight member States...
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National Cooperative Geologic Mapping Program
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Great Lakes Geologic Mapping Coalition (GLGMC)

The Great Lakes Geologic Mapping Coalition (GLGMC) advances the understanding of the three-dimensional distribution of the glacial, periglacial, and proglacial deposits that overlie the bedrock of the glaciated Midwest. It recognizes the fact that several continental glaciations of the last million years have profoundly affected the geology and the natural environment of all eight member States...
Learn More
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NCGMP STATEMAP Representation Thumb

STATEMAP

The primary objective of the STATEMAP component of the NCGMP is to establish the geologic framework of areas determined to be vital to the economic, social, or scientific welfare of individual States. STATEMAP mapping priorities are established by State Geological Surveys in consultation with a multi-representational State Mapping Advisory Committee. These priorities are based on multiple factors...
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National Cooperative Geologic Mapping Program
link

STATEMAP

The primary objective of the STATEMAP component of the NCGMP is to establish the geologic framework of areas determined to be vital to the economic, social, or scientific welfare of individual States. STATEMAP mapping priorities are established by State Geological Surveys in consultation with a multi-representational State Mapping Advisory Committee. These priorities are based on multiple factors...
Learn More
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EDMAP Representation Thumb

EDMAP

EDMAP is the component of the NCGMP that funds universities to train the next generation of geologic mappers. EDMAP is a one-year, mentor-guided program designed to teach students geologic mapping techniques through rigorous field mapping. Colleges and universities in the United States and Puerto Rico are eligible to apply through an annual competitive grants process. Every Federal dollar that is...
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National Cooperative Geologic Mapping Program
link

EDMAP

EDMAP is the component of the NCGMP that funds universities to train the next generation of geologic mappers. EDMAP is a one-year, mentor-guided program designed to teach students geologic mapping techniques through rigorous field mapping. Colleges and universities in the United States and Puerto Rico are eligible to apply through an annual competitive grants process. Every Federal dollar that is...
Learn More
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USGS multimillion-dollar science investments strengthen domestic supply chains for critical minerals

USGS multimillion-dollar science investments strengthen domestic supply chains for critical minerals

RESTON, Va. — The U.S. Geological Survey is investing millions of dollars in strengthening domestic supply chains for mineral resources critical to...

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USGS provides $2 million to states to identify critical mineral potential in mine waste

USGS provides $2 million to states to identify critical mineral potential in mine waste

RESTON, Va. — The U.S. Geological Survey has invested more than $2 million from President Biden’s Bipartisan Infrastructure Law in cooperative...

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USGS makes $5 million available from the Bipartisan Infrastructure Law for mine waste research

USGS makes $5 million available from the Bipartisan Infrastructure Law for mine waste research

RESTON, Va. — The U.S. Geological Survey (USGS) is soliciting proposals for Fiscal Year (FY) 2023 grants to collect data on mine waste. This new...

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Geological Engineering Student, Professor Assist USGS in Mapping Charleston

Geological Engineering Student, Professor Assist USGS in Mapping Charleston

A University of Mississippi geological engineering professor and his graduate student are assisting in a federally funded research project to geo-map...

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