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Mendenhall Research Fellowship Program

In Fiscal Year 2001, the U.S. Geological Survey (USGS) started a new postdoctoral research program called the Mendenhall Postdoctoral Research Fellowship Program (now the Mendenhall Research Fellowship Program) in honor of Walter C. Mendenhall (1871-1957), the fifth Director of the USGS. The Program provides Fellows research experiences that enhance their scientific stature and credentials.

News

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Could You Be a Mendenhall Fellow?

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Volcano Watch — The refilling of Halemaʻumaʻu crater

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Could You Be a Mendenhall Research Fellow?

Publications

State of stress in areas of active unconventional oil and gas development in North America

In this paper, we present comprehensive data on stress orientation and relative magnitude in areas throughout North America where unconventional oil and gas are currently being developed. We find excellent agreement between maximum horizontal principal stress (SHmax) orientations over a wide range of depths, using multiple methods. In all basins studied, we observed coherent stress fields that in

Towards a holistic sulfate-water-O2 triple oxygen isotope systematics

Triple oxygen isotope (∆17O with δ18O) signals of H2O and O2 found in sulfate of oxidative weathering origin offer promising constraints on modern and ancient weathering, hydrology, atmospheric gas concentrations, and bioproductivity. However, interpretations of the sulfate-water-O2 system rely on assuming fixed oxygen-isotope fractionations between sulfate and water, which, contrastingly, are sho

Constraints on triple oxygen isotope kinetics

Isotopic disequilibrium is not as well constrained as equilibrium, hindering interpretation of isotopic variations. Kinetic isotope effects, a subset of disequilibrium, are common in nature and have been assumed to be distinct from equilibrium and mass independent isotope effects based on underdeveloped criteria. Using basic physical principles, we provide needed mechanistic constraints on mass-de