NEHRP Clearinghouse
- Title
- Earthquake Surveys of the Roosevelt Hot Springs and the Cove Fort Areas, Utah. Volume 4.
- File
- PB268421.pdf
- Author(s)
- Olson, T. L.; Smith, R. B.
- Source
- National Science Foundation, Washington, D.C. Research Applied to National Needs., October 1976, 94 p.
- Abstract
- Forty-nine days of earthquake monitoring around the Roosevelt Hot Springs KGRA during 1974 and 1975 indicates little earthquake activity and no correlation with the Hot Springs area. Marked earthquake activity, however, was located 25 km east within the Cove Fort-Sulphurdale KGRA. A total of 163 earthquakes were located from the two surveys. Focal depths for the Cove Fort area were shallow with 75% of the activity less than 5 km in depth. The maximum calculated depth was 16 km. Composite fault plane solutions in the Cove Fort area showed normal faulting with generally east-west trending T-axes. A high b-value of 1.27 and a statistical analysis using the Kolomogorov model of event occurrence imply swarm-like activity near Cove Fort. Consistently positive P-wave residuals of up to 0.10 sec and detectable S-wave attenuation of ray paths across the Mineral Range are suggestive of the possibility of an upper-crustal zone of high attentuation that is perhaps related to the source of heat of the Roosevelt Hot Springs KGRA.
- Keywords
- Cove Fort-Sulphurdale KGRA; Geothermal fields; Statistical analysis; Geothermal energy; Roosevelt KGRA; Volcanism; Fluid flow; Utah; Heat transfer; Earthquakes; Geological faults