Bryce County, Oregon

The County of Bryce, more commonly known as, “Bryce County”, is one of the thirty-seven counties of the State of Oregon. Straddling the High Cascades in the south-central part of the State, Bryce County is one of the newer counties of Oregon, being established in YYYY. Located in the center of the county, Mount Bryce is the namesake of Bryce County and of the Town of Bryce, the county seat. Most of the county is protected, public land and is administered by various Oregon State Agencies, the largest area being administered by the Oregon Department of the Interior via the Oregon Division of Forestry (Bryce National Forest), Oregon Division of Parks and Recreation (Mount Bryce National Park and Bryce-Dimhalt National Park), and Oregon Division of Fish and Wildlife (Mount Bryce National Wilderness Area).

Overview




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Geography
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Geology

 * Main article: Geology of Bryce County, Oregon
 * Further information: Cascade Volcanic Arc, Klamath Graben, Basin and Range Province § Oregon
 * See also: Aspen Butte, Brown Mountain, Mount Bryce, Mount McLoughlin

The geology of Bryce County consists of various Cascade volcanics as well as Basin and Range extension; the latter manifesting as the Klamath Graben in the eastern part of the county. Of the Cascade volcanics, the most prominent features in this regard are Mount McLoughlin and Mount Bryce: However, other Cascade volcanic features in the area include Brown Mountain, a cinder cone-topped shield volcano to the immediate east of Lake of the Woods and nearby Mount Bryce; and to the south of Brown Mountain is Aspen Butte, another shield volcano. Klamath Graben, in which Upper Klamath Lake (Oregon), Lower Klamath Lake (California), and the city of Klamath Falls (Oregon) are located, is the northwestern-most extension of the Basin and Range Province, an area of crustal extension and faulting that manifests as a series of fault-block mountain ranges separated by valleys (grabens); the northern terminus of the Klamath Graben lies under the Mount Mazama complex of volcanics.

The Klamath Graben area is seismically active, with the largest event in recent times along the system being the 1693 Klamath Falls earthquakes, which were a doublet earthquake registering a M6.0 and M5.9 on the moment magnitude scale, at a depth of 5.9 mi. The Klamath Graben system is capable of producing a M7.3W temblor.

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