Search Results - "Roeloffs, Evelyn"

Tidal calibration of Plate Boundary Observatory borehole strainmeters: Roles of vertical and shear coupling by Roeloffs, Evelyn

“…A multicomponent borehole strainmeter directly measures changes in the diameter of its cylindrical housing at several azimuths. To transform these measurements…”
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EVIDENCE FOR ASEISMIC DEFORMATION RATE CHANGES PRIOR TO EARTHQUAKES by Roeloffs, Evelyn A.

“…For ten earthquakes in nonmagmatic settings, there are credible published accounts of pre-earthquake deformation-rate changes lasting hundreds of seconds to…”
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A mechanism for sustained groundwater pressure changes induced by distant earthquakes by Brodsky, Emily E., Roeloffs, Evelyn, Woodcock, Douglas, Gall, Ivan, Manga, Michael

“…Large, sustained well water level changes (>10 cm) in response to distant (more than hundreds of kilometers) earthquakes have proven enigmatic for over 30…”
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Persistent water level changes in a well near Parkfield, California, due to local and distant earthquakes by Roeloffs, Evelyn A.

“…Coseismic water level rises in the 30‐m deep Bourdieu Valley (BV) well near Parkfield, California, have occurred in response to three local and five distant…”
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Characterizing an “uncharacteristic” ETS event in northern Cascadia by Wang, Kelin, Dragert, Herb, Kao, Honn, Roeloffs, Evelyn

“…GPS and borehole strainmeter data allowed the detection and model characterization of a slow slip event in northern Cascadia in November 2006 accompanying a…”
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Improved constraints on the estimated size and volatile content of the Mount St. Helens magma system from the 2004–2008 history of dome growth and deformation by Mastin, Larry G., Lisowski, Mike, Roeloffs, Evelyn, Beeler, Nick

“…The history of dome growth and geodetic deflation during the 2004–2008 Mount St. Helens eruption can be fit to theoretical curves with parameters such as…”
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Creep rate changes at Parkfield, California 1966-1999: Seasonal, precipitation induced, and tectonic by Roeloffs, Evelyn A.

“…Measured fault creep at Parkfield contains information about the slip rate on the San Andreas fault but also is affected by rainfall and other seasonal…”
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Radon and rock deformation by Roeloffs, Evelyn

“…Seismologists believe that radon gas emissions, changes in electrical potential and other phenomena produced by the deformation of crustal rocks could help…”
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Water-level changes induced by local and distant earthquakes at Long Valley caldera, California by Roeloffs, Evelyn, Sneed, Michelle, Galloway, Devin L, Sorey, Michael L, Farrar, Christopher D, Howle, James F, Hughes, Jennifer

“…Distant as well as local earthquakes have induced groundwater-level changes persisting for days to weeks at Long Valley caldera, California. Four wells open to…”
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Case 21 water level and strain changes preceding and following the August 4, 1985 Kettleman Hills, California, earthquake by Roeloffs, Evelyn, Quilty, Eddie, Scholtz, CH

“…Two of the four wells monitored near Parkfield, California, during 1985 showed water level rises beginning three days before theM^sub w^ 6.1 Kettleman Hills…”
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Leakage and Increasing Fluid Pressure Detected in Oklahoma's Wastewater Disposal Reservoir by Barbour, Andrew J., Xue, Lian, Roeloffs, Evelyn, Rubinstein, Justin L.

“…The Arbuckle Group is the principal reservoir used for wastewater disposal in Oklahoma. In Osage County—a seismically quiet part of the state—continuous…”
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Earth science Radon and rock deformation by Roeloffs, Evelyn

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The Parkfield, California earthquake experiment: An update in 2000 by Roeloffs, Evelyn

“…The US Geological Survey, in cooperation with other institutions, continues to monitor the San Andreas Fault (SAF) near Parkfield, California, hoping to…”
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Induced seismicity by Roeloffs, Evelyn

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Water level and strain changes preceding and following the August 4, 1985 Kettleman Hills, California, earthquake by Roeloffs, E, Quilty, E

“…Two of the four wells monitored near Parkfield, California, during 1985 showed water level rises beginning three days before the M sub(w) 6.1 Kettleman Hills…”
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Summary of recent research in Long Valley Caldera, California by Sorey, Michael L., McConnell, Vicki S., Roeloffs, Evelyn

“…Since 1978, volcanic unrest in the form of earthquakes and ground deformation has persisted in the Long Valley caldera and adjacent parts of the Sierra Nevada…”
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Summary of recent research in Long Valley Caldera, California: Crustal unrest in Long Valley Caldera, California: new interpretations from geophysical and hydrologic monitoring and deep drilling by SOREY, Michael L, MCCONNELL, Vicki S, ROELOFFS, Evelyn

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A mechanism for sustained groundwater pressure changes induced by distant earthquakes by BRODSKY, Emily E, ROELOFFS, Evelyn, WOODCOCK, Douglas, GALL, Ivan, MANGA, Michael

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Hydrologic precursors to earthquakes: a review by ROELOFFS, E. A

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Inferences on the hydrothermal system beneath the resurgent dome in Long Valley Caldera, east-central California, USA, from recent pumping tests and geochemical sampling by Farrar, Christopher D., Sorey, Michael L., Roeloffs, Evelyn, Galloway, Devin L., Howle, James F., Jacobson, Ronald

“…Quaternary volcanic unrest has provided heat for episodic hydrothermal circulation in the Long Valley caldera, including the present-day hydrothermal system,…”
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