Julie Donnelly-Nolan, PhD
Julie Donnelly-Nolan is a research geologist at the U. S. Geological Survey in Menlo Park CA. She does field mapping of volcanoes and collaborates with argon chronologists, paleomagnetists, and petrologists in order to understand potential hazards presented by the volcanoes.
She has spent two decades doing detailed geologic mapping at Newberry Volcano with the goal of unraveling its history and understanding its potential hazards. She also worked for many years at Medicine Lake volcano in N. CA (https://pubs.usgs.gov/sim/2927/). Prior to that she did her U.C. Berkeley PhD thesis on the Clear Lake Volcanic Field in the CA Coast Ranges.
Education and Certifications
PhD, UC Berkeley
Affiliations and Memberships*
American Geophysical Union (AGU)
Geologic Society of America (GSA)
International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI)
Science and Products
Chronology of postglacial eruptive activity and calculation of eruption probabilities for Medicine Lake volcano, northern California
Volcano Hazards Assessment for Medicine Lake Volcano, Northern California
Chemical analyses and K-Ar ages of samples from 13 drill holes, Medicine Lake volcano, California
Argon dating at and near Medicine Lake volcano, California: Results and data
North-central Oregon Cascades; exploring petrologic and tectonic intimacy in a propagating intra-arc rift
Evidence of hydrous differentiation and crystal accumulation in the low-MgO, high-Al2O3 Lake Basalt from Medicine Lake volcano, California
Crustal subsidence and extension and Medicine Lake volcano, northern California
Selected caves and lava-tube systems in and near Lava Beds National Monument, California
IGC field trip T312: South cascades arc volcanism, California and southern Oregon
Research in the Geysers-Clear Lake geothermal area, Northern California
Guides to some volcanic terranes in Washington, Idaho, Oregon, and Northern California
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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Filter Total Items: 23
Chronology of postglacial eruptive activity and calculation of eruption probabilities for Medicine Lake volcano, northern California
Medicine Lake volcano has had 4 eruptive episodes in its postglacial history (since 13,000 years ago) comprising 16 eruptions. Time intervals between events within the episodes are relatively short, whereas time intervals between the episodes are much longer. An updated radiocarbon chronology for these eruptions is presented that uses paleomagnetic data to constrain the choice of calibrated ages.AuthorsManuel Nathenson, Julie M. Donnelly-Nolan, Duane E. Champion, Jacob B. LowensternVolcano Hazards Assessment for Medicine Lake Volcano, Northern California
Medicine Lake volcano (MLV) is a very large shield-shaped volcano located in northern California where it forms part of the southern Cascade Range of volcanoes. It has erupted hundreds of times during its half-million-year history, including nine times during the past 5,200 years, most recently 950 years ago. This record represents one of the highest eruptive frequencies among Cascade volcanoes anAuthorsJulie M. Donnelly-Nolan, Manuel Nathenson, Duane E. Champion, David W. Ramsey, Jacob B. Lowenstern, John W. EwertChemical analyses and K-Ar ages of samples from 13 drill holes, Medicine Lake volcano, California
Chemical analyses and K-Ar ages are presented for rocks sampled from drill holes at Medicine Lake volcano, northern California. A location map and a cross-section are included, as are separate tables for drill hole information, major and trace element data, and for K-Ar dates.AuthorsJulie M. Donnelly-NolanArgon dating at and near Medicine Lake volcano, California: Results and data
No abstract available.AuthorsJulie M. Donnelly-Nolan, Marvin A. LanphereNorth-central Oregon Cascades; exploring petrologic and tectonic intimacy in a propagating intra-arc rift
No abstract available.AuthorsRichard M. Conrey, Edward M. Taylor, Julie M. Donnelly-Nolan, David R. SherrodEvidence of hydrous differentiation and crystal accumulation in the low-MgO, high-Al2O3 Lake Basalt from Medicine Lake volcano, California
The late Pleistocene Lake Basalt of Medicine Lake volcano, California is comprised of variably porphyritic basalt and basaltic andesite flows and scoria. These eruptives are similar in composition and phenocryst abundance to the low-MgO, high-Al2O3 mafic magmas common in convergent margin settings. The petrogenesis of the magmas that produced the Lake Basalt has been inferred from field relations,AuthorsT.P. Wagner, Julie M. Donnelly-Nolan, T.L. GroveCrustal subsidence and extension and Medicine Lake volcano, northern California
The pattern of historical ground deformation, seismicity, and crustal structure near Medicine Lake volcano illustrates a close relation between magmatism and tectonism near the margin of the Cascade volcanic chain and the Basin and Range tectonic province. Between leveling surveys in 1954 and 1989 the summit of Medicine Lake volcano subsided 389±43 mm with respect to a reference bench mark 40 km tAuthorsDaniel Dzurisin, Julie M. Donnelly-Nolan, John R. Evans, Stephen R. WalterSelected caves and lava-tube systems in and near Lava Beds National Monument, California
Lava Beds National Monument (fig. 1) lies on the north slope of the huge Medicine Lake shield (fig. 2), a complex volcanic edifice of greater volume than the steep-sided Mount Shasta volcanic cone, which towers as a snowclad land mark 40 mi southwest of the monument (fig. 3). Much of the north and south flanks of the Medicine Lake shield were built from molten lava transmitted through lava tubes.AuthorsAaron Clement Waters, Julie M. Donnelly-Nolan, Bruce W. RogersIGC field trip T312: South cascades arc volcanism, California and southern Oregon
No abstract available.AuthorsL. J. Patrick Muffler, Charles R. Bacon, Robert L. Christiansen, Michael A. Clynne, Julie M. Donnelly-Nolan, Cheryl Miller, David R. Sherrod, J.C. SmithResearch in the Geysers-Clear Lake geothermal area, Northern California
The Geysers-Clear Lake area is one of two places in the world where major vapor-dominated hydrothermal reservoirs are commercially exploited for electric power production. Because energy can be extracted more efficiently from steam than from hot water, vapor-dominated systems are preferable for electric power generation, although most geothermal electric power facilities tap water-dominated systemGuides to some volcanic terranes in Washington, Idaho, Oregon, and Northern California
This guidebook arose out of a series of field trips held in conjunction with the Pacific Northwest American Geophysical Union meeting held in Bend, Oregon, September 1979. The PNAGU meeting included special volcanology sessions planned by William I. Rose, Jr., Bruce A. Nolf, amd David A. Johnston. Publication of the guidebook volume was originally planned for early 1980 by the Oregon Department ofAuthorsDavid A. Johnston, Julie M. Donnelly-NolanNon-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government