Controls on movement of selected landslides in the Coast Range and western Cascades, Oregon
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Controls on movement of selected landslides in the Coast Range and western Cascades, Oregon by Bernard Bong-lap Wong

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Published .
Written in English


  • Landslides -- Oregon.

Book details:

Edition Notes

Statementby Bernard Bong-Lap Wong.
The Physical Object
Pagination193 leaves, bound :
Number of Pages193
ID Numbers
Open LibraryOL15373183M

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Oregon Geology Landslide Hazards in Oregon Fact Sheet Oregon Department of Geology and Mineral Industries NE Oregon St., Suite Portland, OR OFile Size: 2MB. western Cascades, in the Willamette National Forest, about 80 km east of Eugene. Oregon. The forest boundaries surround a ha watershed in which elevation ranges from to 1, m and typical slopes vary between 10° and 36° (Dyrness, ). At elevations below about 1, m, Douglas fir and western hemlock are the dominant tree species File Size: 2MB. Vegetation composition on recent landslides in the Cascade Mountains of western Oregon. Can. J. For. Res. Shallow, rapid landslides are common events and significant causes of vegetation disturbance in the Pacific Northwest. Landslides remove surface soil and above- and below-ground biomass from steep slopes and deposit them.   They also are locating and dating landslides in the Oregon Coastal Range and Cascades to determine potential risks to the area’s dams. UO researchers, Weldon added, also have been working with the Oregon Department of Geology and Mineral Industries to locate and map previously unknown crustal fault zones. Several have been found.

The map sh past landslide locations compiled by the Oregon Department of Geology and Mineral Industries from published studies and maps by state and federal agencies. According to DOGAMI, a powerful enough winter storm can cause over $ million in landslide repairs. And on average, landslides cost the state $10 million a year. Oregon with a high concentration in western Oregon‘s coast, Coast Range, Willamette Valley and Cascade Range. In a typical year, Oregon receives over 80 inches of rain in places along the coast, 40 to 45 inches in the Willamette valley and about 60 inches in the Cascades. On one hand, landslides are a natural geological event that occurs on rain-drenched hillsides. On the other, human activities such as timber harvests can exacerbate the risk. In , following a couple of drenching storms in western Oregon that resulted in thousands of landslides, a change was made to the state’s forest practices rules to. Coast Range Landslides a Historic Reality in Pacific Northwest J – The massive rainstorm that soaked the Pacific Northwest in early December caused major flooding, more than a dozen deaths and once again raised questions about the cause of the numerous, sometimes very destructive landslides which follow such events – including.

Landslides take lives, destroy homes, businesses and public buildings, interrupt transportation, undermine bridges, derail train cars, cover marine habitat and damage utilities. Causes. The term landslide includes a wide range of ground movement, such as rock falls, deep failure of slopes, and shallow debris flows. At least three landslides – one that spanned somewhere between 75 to feet – have prompted closures along Oregon Route between Joseph and Imnaha in Eastern : Ericka Cruz Guevarra. "Landslides are a natural part of both the Oregon Coast Range and Cascade Range, but it's expected there will be a significant number of them that are . LANDSLIDES AND DEBRIS FLOWS October A landslide is a mass movement of rock, soil, and debris down a slope. In steep terrain, even a small mass movement can transform into a larger, especially dangerous type of landslide. These catastrophic landslides commonly are referred to as debris flows, mudslides, mudflows, debris torrents or shallow.