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Erosional Landforms Images
The hydrologic system, which includes all possible paths of motion of Earth's near-surface fluids including air and water, is largely responsible for the variety of landforms found on the continents. Heat from the sun evaporates water from oceans, lakes, and streams. Although most of the water returns directly as precipitation to the oceans, some of the water is recipitated over land as rain or snow. If it is precipitated over land, it then begins its journey back to the sea as "runoff." The relentless action of surface runoff, streams, and rivers, glaciers, and waves sculpts the rock into intriguing and bizarre shapes. This set of slides includes examples of wave erosion, wind and water erosion, valley shapes, and glacial rosion. The views are often dramatic. Many were taken at U.S. National Parks and Monuments.
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Faults Images
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Through the study of faults and their effects, much can be learned about the size and recurrence intervals of earthquakes. Faults also teach us about crustal movements that have produced mountains and changed continents. Initially a section of Earth's crust may merely bend under pressure to a new position. Or slow movement known as seismic creep may continue unhindered along a fault plane. However stresses often continue to build until they exceed the strength of the rock in that section of crust. The rock then breaks, and an earthquake occurs, sometimes releasing massive amounts of energy. The ensuing earth displacement is known as a fault. This slide set describes the mechanism and types of faulting. It illustrates a variety of fault expressions in natural and manmade features.
November 1994 Skagway, USA Images
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On November 3, 1994, at 7:10pm local time, a large tsunami generated by a massive landslide in the submerged Skagway River delta occurred near Skagway, Alaska. This event resulted in one fatality and approximately $25 million of damage, leaving several harbor structures damaged or destroyed.
June 1979 Cadoux, Australia Images
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Western Australia. Damage: $1.5 million.
September 1886 Charleston, USA Images
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Generally referred to as August 31, 1886, as the earthquake occurred at 9:51 pm local time. Eight minutes later there was a severe aftershock. This was the most damaging earthquake to occur in the southeastern U.S. and one of the largest historic shocks in eastern North America. Structural damage was reported within several hundred kilometers from Charleston, and long-period effects were observed at distances exceeding 1,000 kilometers.
November 1929 Grand Banks, Canada Images
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On November 18, 1929, at 5:30 pm local time, an earthquake occurred approximately 250 km south of Newfoundland along the southern edge of the Grand Banks. The earthquake triggered a large submarine slump which ruptured 12 transatlantic cables in multiple places, and generated a tsunami. More than 40 local villages in southern Newfoundland were affected, where numerous homes, ships, businesses, livestock and fishing gear were destroyed.
April 1981 Westmorland, Calipatria, USA Images
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Magnitude 6.3. Damage $1-$3 million. Subsidence was reported on several rural roads in the area. Liquefaction caused scores of mudpots, and oozing soil in nearby fields. One country road west of Westmorland collapsed, producing a 2-foot drop-off. In rural areas, unreinforced, concrete-lined irrigation canals were broken.
April 1984 Morgan Hill, USA Images
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This magnitude 6.2 earthquake caused $30 million in property damage in northern California. The epicenter of the quake was located near Mount Hamilton in the Diablo Range of the California Coast Ranges. The earthquake was felt over an area of 120,000 square kilometers in California and western Nevada.
Multichannel Seismic Reflection Data - SCAR - Wilkes Land, 1983, SDLS CD-ROM vol 10
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These data are stacked multichannel marine seismic reflection data from thirteen lines recorded during 1983 off Wilkes Island, Antarctica, by the Japan National Oil Corporation. The following data types are included for each line: computer display images, location maps, and the digital seismic data. Software is provided to view the images, to plot selected portions of the data to the screen, and to convert the data into SEG-Y formation. The CD-ROM was produced in accordance with the ISO 9660 Standard. The display software runs only under DOS. All text files are in ASCII format.
April 1965 Seattle, USA Images
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The magnitude 6.5 earthquake killed 7 and caused 12.5 million in property damage.
May 1983 Coalinga, USA Images
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Location: Central California, 20.8 kilometers from Coalinga. Affected area: 205,000 square kilometers. Damage: $31 million. The most serious damage occurred in the eight-block downtown commercial district, but residents were also heavily damaged. More then 800 single-family houses were destroyed or incurred major damage. The majority of the 94 injuries occurred in residential sections of the city.
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