These normal faults make up the Trans-Challis Fault Zone. View from graben, observer side down.Northwest side of Rock Creek valley showing fault displacement of an irrigation aqueduct. The 1983 fault movement broke the aqueduct as seen in this view.Multiple fault scarps on the Lost River Fault. Fault: Lost River Fault : Type: Normal: Areas affected: Central Idaho United States: Total damage $12.5 million : Max. The trans-Challis fault system (TCFS) is a new structural province in central Idaho mapped during the Challis CUSMAP program conducted by the U.S. Geological Survey. Less violent and less voluminous silicic eruptions continued until approximately 39 Ma. The dacitic and rhyodacitic ash flows and lava flows are the most voluminous units in the Southern Challis Field. Idaho Fault Line Could Spur 7.5-Magnitude Quake November 18, 2010 / 11:56 AM / CBS A newly-discovered seismic fault line in central Idaho could produce a … The Eocene geologic setting of the Challis volcanics is commonly accepted as an extensional basin related to the subduction of the oceanic Farallon Plate beneath the continental North American Plate.
Eocene volcanic belt in the northwestern United States. Social Sharing The quake happened in Idaho at 5:52 p.m. Tuesday Calgary, a prairie city far from any nearby fault lines, felt an unfamiliar sensation early Tuesday evening — an earthquake. Figure 1. For example, the Idaho Falls-Rexburg webpage will contain information and digital data related to NEHRP and liquefaction susceptibility research.View of Lost River fault scarp crossing Double Springs Rd. Most of Idaho has fault lines. 2020-09-02 14:10:09 UTC 2.0 magnitude, 1 km depth Challis, Idaho, United States 2.0 magnitude earthquake 2020-09-02 14:10:09 UTC at 14:10 September 02, 2020 UTC Drawing showing shallow subduction and then migration and steepening of the subducting plate. Upon collapse, two of the calderas, the Van Horn Peak and Twin Peaks caldera complexes formed a linear graben oriented in a northeast-southwest direction that corresponds to the most eruptive part Trans-Challis fault zone (Figure 4). As in Northern Challis Field, the Southern Field contains late-stage dacite and rhyolite domes and associated lava flows.Mineralization within the Challis Volcanic Group is associated with volcanic and plutonic activity, such as the emplacement of the domes and plutons, caldera collapse, and widespread hydrothermal activity.
A downward curve of the upthrown side of the fault is a relict from an earlier earthquake-generated fault movement. Eight photos (below) by IGS staff of the fault scarps and damage caused by the 7.3 magnitude Borah Peak earthquake in 1983 near Challis in east-central Idaho. It ranges between unconformable to locally conformable with the overlying Challis Volcanic Group, indicating that deposition occurred during local onset of Challis volcanism. Geological and seismological studies show that earthquakes are likely to happen in any of several active zones in Idaho and adjacent states.Idaho has also experienced two large earthquakes in historical times: the 1959 Eight photos (below) by IGS staff of the fault scarps and damage caused by the 7.3 magnitude Borah Peak earthquake in 1983 near Challis in east-central Idaho. Rhyodacite and rhyolite ash-flow tuffs erupted from the Van Horn Peak caldera complex, the Thunder Mountain caldera, and the Twin Peaks caldera. The intermediate to mafic rocks contain dacite with phenocrysts of plagioclase, pyroxene, and/or amphibolite and biotite, as well as andesite to basalt with phenocrysts of pyroxene or olivine and plagioclase. The Northern Challis Field lies north of the 44 degree latitude line, and the Southern Challis Field lies to the south of it (Figure 5).
From Link and Janecke, 1999. The first phase … Many attachments to buildings have strength in the vertical direction only, i.e.
It also helps to define pre-Challis paleotopography. Other active faults in central Idaho lie in the Beaverhead, Lemhi and Lost River mountain ranges.
The tuff of Ellis Creek is the largest of these ash-flow tuffs, with thickness up to 400 meters outside of the Van Horn Peak caldera, and up to 1,500 meters within the caldera. The Borah Peak earthquake killed two children when a storefront collapsed in the central Idaho town of Challis and damaged buildings within a 50-mile radius. Yes. The main phase of eruption occurred between 51 � 45 Ma, and consisted of effusive and voluminous intermediate and mafic lava flows as well as highly explosive silicic ash-flows. This view shows the low strength of untied brickwork when shaken by horizontal earthquake forces.Earthquake damage to the IGA store in Mackay. The landslide probably started at the same time as the intense earthquake vibrations, but because landslide debris covers the fault scarp, the landslide was active longer than the time it took for the fault scarp to form.NEHRP site class maps, liquefaction susceptibility maps, and associated metadata are located under the study location heading. Intrusive plutons are mostly composed of granite with large pink crystals. Idaho’s history of earthquakes includes the Borah Peak quake and smaller temblors near Challis and East Idaho’s Soda Springs. Images are taken from the IGS publication The Borah Peak Earthquake: A 35-mm Slide Set for Earth Science Educators, Earthquake damage to the Custer Hotel in Mackay.
The second phase included volcanic eruptions.
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