dc.contributor |
Háskóli Íslands |
dc.contributor |
University of Iceland |
dc.contributor.author |
Bjarnason, Ingi Þorleifur |
dc.contributor.author |
Pechmann, James C. |
dc.date.accessioned |
2018-02-14T10:41:24Z |
dc.date.available |
2018-02-14T10:41:24Z |
dc.date.issued |
1989 |
dc.identifier.citation |
Ingi Þorleifur Bjarnason, James C. Pechmann. (1989). Contemporary tectonics of the Wasatch front region, Utah, from earthquake focal mechanisms. Bulletin of the Seismological Society of America, 79(3), 731-755. |
dc.identifier.issn |
0037-1106 |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/571 |
dc.description.abstract |
We have completed a comprehensive study of focal mechanisms of digitally
recorded earthquakes (M, -_< 4.4) that occurred in the Wasatch front region in
Utah during 1980 to 1986. Single-event solutions for 24 events were determined
using recently revised crustal models and a computerized grid-search technique.
Overall, the mechanisms show predominantly normal faulting on N-S-striking
nodal planes of moderate to steep dip (>30°). Tension-axis azimuths average
96 ° _+ 12% Thus, in general, the mechanisms indicate E-W to ESE-WNW crustal
extension and vertical crustal shortening. Oblique slip, when observed, is characterized
by left-lateral motion on planes striking N to NE or right-lateral motion
on planes striking N to NW. Most of the mechanisms with significant amounts of
oblique-slip motion occur in the southern part of the study area, where compression-
axis orientations range from near vertical to near horizontal. Thus, the
mechanisms suggest a possible change in stress regime from north to south
along the Wasatch front. Despite geologic evidence for low-angle faults in the
study area, shallowly dipping nodal planes are relatively uncommon. |
dc.description.sponsorship |
This research was supported by the U.S.
Geological Survey, Department of the Interior, under award numbers 14-08-0001-Gl163 and 14-08-0001-
G1349. Partial support also came from a scholarship awarded by the Society of Exploration Geophysicists
and sponsored by the Sohio Petroleum Company. |
dc.format.extent |
731-755 |
dc.language.iso |
en |
dc.publisher |
The Seismological Society of America |
dc.relation.ispartofseries |
Bulletin of the Seismological Society of America;79(3) |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Jarðskjálftar |
dc.subject |
Jarðskjálftamælingar |
dc.subject |
Misgengi (jarðfræði) |
dc.subject |
Utah |
dc.title |
Contemporary tectonics of the Wasatch front region, Utah, from earthquake focal mechanisms |
dc.type |
info:eu-repo/semantics/article |
dc.description.version |
Peer Reviewed |
dc.identifier.journal |
Bulletin of the Seismological Society of America |
dc.contributor.department |
Raunvísindastofnun (HÍ) |
dc.contributor.department |
Science Institute (UI) |
dc.contributor.school |
Verkfræði- og náttúruvísindasvið (HÍ) |
dc.contributor.school |
School of Engineering and Natural Sciences (UI) |