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Filters: Collection Name: "Environmental Geology in Utah"
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1 A reservoir showing the earth-fill dam and a landslide block separated from the abutment in the foreground. Opposite abutment is an ancient landslide.Image
2 Aerial photograph showing same swath and slide as on topographic map. Arrow points to displaced mass from swath behind it in mountain range.Image
3 Ancient landslides show up on maps with scales as small as one inch to the mile. Three such ancient slides are pointed out along the mountain front in Juab County. Note swath of anomalous contours leading down to lowermost slide, obviously the path of bedrock which failed.Image
4 Another example of dynamic forces at work in the geologic environment: pressure ridges formed in the salt crust of Utah's Bonneville Salt Flats. These ridges grow and shrink seasonally.Image
5 Areas of carbonate rock (limestone) outcrops (in blue) in the vicinity of Bear Lake, Utah. Rocks range in age from Cambrian to Jurassic. Development on the outcrop area should be closely monitored to protect the underlying potable water aquifer.Image
6 Arrow points to incipient failure of an excavation wall for a foundation for a multistory office building. Material is horizontally stratified Lake Bonneville silts and sands.Image
7 Bear Lake area map showing: (1) point of issue of Swan Creek Spring, (2) possible contributory sink holes (in red) in the Bear River Range, (3) precipitation (rain and snow) measuring stations (in bluelined blocks).Image
8 Big Cottonwood Creek flooding in Salt Lake City. Numerous houses along its banks were flooded in 1952.1952Image
9 Blasting for an interstate highway in the immediate vicinity of a dam. Concrete railing of dam appears in lower right corner. Vibrations, whether natural (earthquake) or manmade, may damage structures on sensitive foundations.Image
10 Branch of the Wasatch Fault exposed in utility trench excavation in Salt Lake City. Hammer and field book are at the same stratigraphic horizon, indicating a displacement of 2 1/2 feet in late mudflow deposits, just below the ground surface.Image
11 Breach of highway embankment on East Bench in Salt Lake City caused extensive damage to residential neighborhood downslope.Image
12 Characteristic arcuate crack pattern in basement of house. Both vertical and lateral displacement is apparent.Image
13 The circumstances here probably make a utility trench cave-in inevitable. A perched water table is sapping fine sand from underneath a thick silt bed, leaving the latter unsupported. Failure will be too rapid for escape of a workman who may be in the trench at the wrong moment.Image
14 Closer view of head and foot of Park City landslide. Note tilt blocks at head of slide.Image
15 Closer view of slide cracks in high fill in Salt Lake City subdivision. Note housing density downslope.Image
16 Closeup of slide plane. Note deposition of white calcium carbonate by groundwater along slide plane. Arrow points to smooth, slickensided (grooved) surface on underside of sliding mass.Image
17 Closeup view of the fault shown in last slide (p1274n093).Image
18 Cloudburst flood caused erosion of the North Bench in Salt Lake City. Eroded channel begins where paved street ends.Image
19 Cone or fan of debris deposited on highway after cloudburst flood in Big Cottonwood Canyon.Image
20 Crack down the highway centerline, showing displacement. U.S. 6 near Colton.Image
21 Crack in soil alongside reservoir, showing subsidence. Reservoir was the only water storage facility serving several thousand people.Image
22 Damage to a house in Salt Lake City results from an unsatisfactory foundation. Note in particular the dropping of the arch over the doorway.Image
23 Damage to a major edifice in Salt Lake City resulted from differential settling of the two portions of the building. Arrow points to zone of distress which extends to foundation level. Note that window frames are askew.Image
24 Damage to newly laid curb and gutter on Salt Lake City's East Bench, resulting from August 1969 cloudburst.1969-08Image
25 Damage to the Salt Lake City Cemetery from a flood channeled in Perry's Hollow, a normally dry drainage course.Image
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