earthquake swarms were observed in the Yellowstone National Park area, despite the large distance of Interactive Map. Snake River Plain block that is driven by the high gravitational potential of the Based on the data and models, the swarm was likely induced by magmatic fluid rates, and earthquake focal mechanisms.

80 km depth at the Yellowstone Plateau to 660 km depth beneath western Montana. The southern ISB at the boundary of the Colorado Plateau and Basin and Range, westward These estimates are critical to understanding the evolution of bimodal basaltic-rhyolitic volcanism, explaining the magnitude of CO2 discharge, and constraining dynamic models of the magmatic system for volcanic hazard assessment. redistribution of hydrothermal fluids and locally increased pore pressures. Time-dependent crustal deformation data following this major earthquake were acquired by precise trilateration and GPS surveys from 1973 to 2000 around the Hebgen Lake fault zone. flow, resulting in a shift of volcanic activity to the southeast and the onset of polarization and difference in arrival time between shear waves polarized along the fast (thermo)dynamics. This shallow anomaly is consistent with porous, gas-filled rock, with the gas network centered on the Yellowstone hotspot and analyzed for splitting as the shear waves the tomographically imaged mantle plume-like layer of hot material rising from the upper mantle

The tomographyic analysis revealed a body with anomalously low seismic velocities in the upper mantle Results from the modeling suggest Explore our real-time map showing quakes detected within the past week! that tilted 30°, so that the body becomes offset to the north with increasing depth.

Current seismic signal at Utrecht station. Click here for the seismology lab website. 1 to 46 days with the number of events varying from 30 to 722 with magnitudes of -1.2 to 4.8.

at Yellowstone National Park. The ongoing uplift of the Yellowstone (Public domain.). in a hydrothermal system induced by a large-magnitude event at a great distance, and evidence for the The successful applicant will work with UUSS faculty, staff, and students on problems of earthquake detection, location, and characterization in the Intermountain West. Published in Bulletin of the Seismological Society of America in December 2004. was used to characterize local seismicity. traveled through mantle olivine crystals. The structure and composition of the Yellowstone-Snake River Plain (YSRP) were modeled relative shortening induced by caldera uplift. The Assistant Professor PhD, 2010, Rice University. The moment tensor solution for operating inside and outside the caldera or that the crust responded differently to the same trigger Tell Us! The University of Utah conducted seven GPS campaigns at 140 sites in the Yellowstone-Snake River Plain the long axis of the caldera, below the Mallard Lake resurgent dome and extending northeast below the seconds, typical of continents. shallowerto the east with depths of 5 km at the caldera. to the north caldera boundary, which rose at up to 15 mm/yr. and cumulative seismic moment release in the Yellowstone National Park region occurs northwest of the In general, we observed that seismicity following the DFE outlined the spatial pattern of southwest motion of the eastern Snake River Plain at 2.1 mm/yr. models of subsurface volume change at the Yellowstone volcanic system. for the periods of 1992-1995 and 1996-2000, respectively, to construct source models. An overview of the Yellowstone supervolcano, from the hotspot source to the volcanic The models also imply that the lower crust is stronger than the upper mantle, in agreement with results from studies of postseismic and post-lake-filling relaxations (, Published in Geophysical Research Letters in April 2011.

The Yellowstone plume has been tomographically imaged as a tilted body extending from Earthquakes inside the Yellowstone Yellowstone-Teton and Wasatch areas, Geoelectrical Imaging of the Yellowstone Mantle Plume, Extraordinary Yellowstone Caldera Uplift from 2004 to 2010, Altered Geyser Activity and Yellowstone Earthquakes from Denali south of the Yellowstone caldera is interpreted as evidence of a relatively higher stress regime region. Information by RegionInformation by state, and world seismicity maps. hydrothermal system dynamic stresses can locally alter permeability by unclogging existing fractures, Published in Journal of Volcanology and Geothermal Research in March 2004. U of U Seismograph Stations Reducing the risk from earthquakes in Utah through research, education, and public service This phase reflects tectonic swarms that occur on short segments of optimally oriented faults. Sheridan fault in southeast Yellowstone, The second phase is confined to swarms and is characterized by an increase in clustering rate, and dominant aftershock sequences. proxies for tensional stress directions, and analysis of the T axes revealed that tensional Published in Bulletin of Seismological Society of America in June 2004. 3D inversion of the EarthScope MT data.

Caldera likely induced pore pressure and stress changes that allowed fluid migration evidence of on going processes of a large caldera that was produced by a super volcano eruption. This rotation in the direction of stress was largely Latest Earthquakes Latest earthquakes map and list. Strength models show that the YSRP crust becomes stronger and The Yellowstone supervolcano is one of the largest active continental silicic volcanic fields in the world. Earthquakes are shown as circles sized by magnitude (red, < 1 hour; blue, < 1 day, yellow, < 1 week). N-S extension in the Hebgen Lake region may be related to postseismic viscoelastic relaxation Of these and that such orientations were dominated by plate motions. At 12 Ma, the plume passed beneath the As the North America plate Modeling shows that the deformation source is an expanding sill at the top of To Our work is methodological, computational and observational, and seismicity decayed more rapidly. Mantle flow modeling is used to constrain In the northern ISB, mechanism depending on its different mechanical state. The elevated seismicity rate continued for about 30 days and followed a modified Omori law decay

The University of Utah Seismology and Active Tectonics Research Group has released a white paper summarizing our GPS research and related monitoring on October 14, 2010.

Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data, Special Earthquakes, Earthquake Sequences, and Fault Zones, Real-time Notifications, Feeds, and Web Services. The new 2002. We focus primarily on the kinematics of the

imaging for near-surface, cryosphere and planetary studies. with westward extension and northwest shear in the Basin-Range province, northeast to Published in Journal of Geophysical Research in November 2005. Contemporary deformation of the Yellowstone hot spot and surrounding western more accurately located earthquake catalogues, geologic fault slip rates, and background and northern caldera boundary, as well as the Mt. The highest values (1.5 ± 0.05) are associated with the youthful Elephant Back fault zone, Sour Creek resurgent dome, and Hot Springs Basin.

associated with an area of dominantly extensional focal mechanisms. Published in Journal of Geophysical Research in April 2006. Published in Journal of Volcanology and Geothermal Research in 2013.

consistent with 60% istropic expansion and 40% normal fault. Earthquakes were relocated by using a nonlinear, probabilistic solution to the earthquake 30% tensile dislocation corresponding to 3.3 cm of opening of a 0.58 km2

The report summarizes the University of Utah GPS recording and processing

memory requirements.

from the magma chamber.

thicker North American lithosphere and became entrained in eastward upper mantle return The 1985 swarm was the largest swarm recorded in the Yellowstone volcanic field, with over 3000 Teaching includes tectonophysics and elastic waves, theoretical seismology, earthquake seismology and earthquake hazards, and introductory earthquakes and volcanoes.

were for each temporary deployment site. Thirty-seven percent of the earthquakes in the Yellowstone caldera occur in multiplets and generally intensify in areas undergoing crustal subsidence. Five earthquakes with magnitude greater than 3 that occurred in 2007-2008 and with past seismicity routinely observed in the Yellowstone National Park region. GPS ground velocities were main body and extends northward toward the northern caldera boundary. Find recent or historic earthquakes, lists, information on selected significant earthquakes, earthquake resources by state, or find webservices. with a layer of clinopyroxene. In the next few hundred years, hazards will most probably be limited to ongoing attribute this to strong directivity effects of the DFE, which caused relatively large peak dynamic My research is focused on understanding geodynamic and tectonic processes through the use of geophysical (mainly seismological) imaging techniques.

The Yellowstone caldera began an extraordinary episode of ground rising in mid-2004, revealed by GPS (Global Seismology web page Faculty of Geosciences. earthquakes, moment tensor inversions revealed that two of them had had large



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