Northern Basin and Range Geothermal Region

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Northern Basin and Range Geothermal Region


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Examination of seismicity and late Quaternary faults in Montana and Idaho north of the Snake River Plain shows a geographic correspondence between high seismicity and 24 faults that have experienced surface rupture during the late Quaternary. The Lewis and Clark Zone delineates the northern boundary of this tectonically active extensional region. Earthquakes greater than magnitude 5.5 and all identified late Quaternary faults are confined to the Montana-Idaho portion of the Basin and Range Province south of the Lewis and Clark Zone. Furthermore, all 12 Holocene faults are confined to a seismologic zone (Centennial Tectonic Belt) parallel to the northern flank of the Snake River Plain in extreme southwestern Montana and adjacent Idaho. Fault trends, strain data, and focal mechanisms suggest that both late Quaternary faulting and seismicity in the region are primarily products of two distinct stress regimes: (1) overall Basin and Range extension along a S45°W direction relative to the mid-continent; and (2) localized effects of the Yellowstone hot spot which appears to have the least principle stress axis oriented horizontally at about S4°W. The three largest historic earthquakes north of the Snake River Plain are indicative of three different stress provinces—the 1983 Borah Peak earthquake occurred in the Montana-Idaho basin and range; the 1959 Hebgen Lake earthquake is associated with the Yellowstone hot spot area; and the 1925 Clarkston Valley event appears to be associated with the stress field of the United States mid-continent. [1] Cenozoic Tectonic Evolution of the Basin and Range Province in Northwestern Nevada [1]


References

  1. 1.0 1.1  "Cenozoic Tectonic Evolution of the Basin and Range Province in Northwestern Nevada"
Geothermal Region Data
State(s) Arizona, Idaho, Nevada, Utah, Wyoming

Area 298,001 km²298,001,000,000 m²
115,028.386 mi²
3,207,652,963,900 ft²
356,409,196,000 yd²
73,637,537.105 acres
USGS Resource Estimate for this Region
Identified Mean Potential 358.3 MW358,300 kW
358,300,000 W
358,300,000,000 mW
0.358 GW
3.583e-4 TW
Undiscovered Mean Potential 3,626.5 MW3,626,500 kW
3,626,500,000 W
3,626,500,000,000 mW
3.627 GW
0.00363 TW
Planned Capacity
Planned Capacity 503 MW503,000 kW
503,000,000 W
503,000,000,000 mW
0.503 GW
5.03e-4 TW
Plants Included
in Planned Estimate
9
Plants with Unknown
Planned Capacity
11

Energy Generation Facilities within the Northern Basin and Range Geothermal Region


Geothermal Exploration Techniques used within the Northern Basin and Range Geothermal Region