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Title: Seismic Reflection Imaging of Impact-Induced Faulting and Deformation at Upheaval Dome, Canyonlands National Park, Utah
Url: http://crack.seismo.unr.edu/ftp/pub/louie/dome/97agu/97agu.html
Creator: Chavez-Perez, S.
Kanbur, Z.
Louie, J.N.
Plank, G.
Publisher: University of Nevada, Reno. Seismological Laboratory
Description: This report describes a study in which seismic profiling was used to re-interpret the origin of Upheaval Dome, Utah, a geologic structure that was originally thought to be the results of a salt diapir, but which the authors believe may be the remains of an ancient impact structure.

ABSTRACT: Seismic imaging techniques applied to a reflection survey show two phases of faulting and deformation beneath Upheaval Dome, Utah. Recent work suggests Upheaval Dome may be the largest impact structure on the Colorado Plateau, having a ring syncline ~3 km in diameter. To better describe the impact deformation of a brittle layer above a viscous layer, as exists at Upheaval Dome with the underlying Paradox Salt, four institutions conducted a NASA-funded seismic reflection survey in January 1995. We obtained a 5 km section extending radially from the Dome's central depression using a 320 kg weight-drop source and a 48-channel off-end receiver spread 0.5 km long. The data show clear reflections as deep as 1.5 km. Imaging of the reflection section with velocity filtering and 3-d prestack Kirchhoff migration techniques reveals the geometries of deformed stratigraphy from the surface to the top of the Paradox Formation at 1.2 km depth. Stratigraphic terminations and fault-plane images show the paths of listric faults. We tie our sections to two well logs, one in the ring syncline and one outside the zone of deformation. Deformation appears in two phases with respect to depth, with listric normal faults in the ring syncline and the megablock zone confined to the part of the section above the Hermosa Formation. Listric faults flatten and sole into the clastic formations above the calcareous layers of the Hermosa at 1.0 km depth. At the base of the Hermosa, on the axis of the ring syncline, the Paradox has forced the Hermosa 0.1 km up and broken it with thrust faults. Post-impact relaxation of the crater form may have driven this deeper uplift. These two modes of deformation, driven from above and below, leave the upper Hermosa as the least-deformed part of the structure.
LC Classification: Geography. Anthropology. Recreation -- Atlases -- By region or country -- America. Western Hemisphere -- North America -- United States -- The West -- Pacific and Mountain States. Far West -- Southwestern States -- New Southwest -- Utah -- Regions, natural features, etc., A-Z
Science -- Geology -- Dynamic and structural geology -- Structural geology -- Deformation
Science -- Geology -- Dynamic and structural geology -- Structural geology -- Faults and folds -- By region or country, A-Z
Science -- Geology -- Dynamic and structural geology -- Volcanoes and earthquakes -- Earthquakes. Seismology -- Seismic waves. Elastic waves
Science -- Geology -- Dynamic and structural geology -- Volcanoes and earthquakes -- Earthquakes. Seismology -- Special topics, A-Z -- Seismic models
Science -- Geology -- Geographical divisions -- America -- North America -- United States -- By state -- Utah
Science -- Natural history. Biology -- Biology (General) -- Methods of research. Technique -- Other special, A-Z -- Three-dimensional imaging
Science -- Natural history. Biology -- Natural history (General) -- Geographical distribution. Biogeography. Phylogeography -- Topographical divisions -- America -- North America -- United States -- By region, A-Z -- Colorado Plateau
Technology -- Mining engineering. Metallurgy -- Mining engineering. Metallurgy -- Geophysical surveying -- Seismic prospecting -- Seismic reflection method
GEM Subject: Science -- Technology
Science -- Earth science
Science -- Geology
Science -- Physical sciences
Key Concept: Geology
Geology -- Earthquakes
Geology -- Rocks
Geology -- Topography
Geology -- Faults
Geology -- Folding
Geology -- Seismic waves
Resource Type: Models
Reading Materials
Science Materials
Format: html
Audience: Higher Education
Professional Formation
Secondary Education
Technical School First Cycle
Technical School Second Cycle
University First Cycle
University Postgrad
University Second Cycle
Vocational Training
Language: English
Access Rights: Free access
Source: DLESE
Full Record Views: 21
Resource URL Clicks: 2
Cumulative Rating: NOT YET RATED
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