Largest
landslide
Saidmarreh
landslide is located in western Iran.
Landsat
image of Saidmarreh Landslide in Saidmarreh, Iran. The source area of the slide
is bounded on the southwest by the crest of the Kabir Kuh anticline. Debris
from the slide travelled down the flank of the anticline, across the Karkheh
River and continued across the valley floor. Some material in the slide was
carried a distance of 14 kilometers (9 miles).
One
of the largest landslides that can be easily recognized on satellite images is
the Saidmarreh Landslide in western Iran. The slide occurred about 10,000 years
ago when about 20 cubic kilometers (about 5 cubic miles) of Lower Miocene and
Eocene limestone detached along bedding planes and slipped down the north flank
of the Kabir Kuh anticline. The maximum vertical descent was about 1600 meters
(5250 feet).
The
sliding slab was about 15 kilometers (9 miles) wide and had a surface area of
about 165 kilometers (64 square miles). Debris from the slide crossed the
Karkheh River at the base of the slope and spread across the valley floor. Some
material in the slide had a travel distance of over 14 kilometers (9 miles).
The slide debris dammed the Karkheh River,
causing a large lake to form behind the dam. The lake persisted long enough for
up to 150 meters of sediment to accumulate on its bottom (these sediments
currently support several thousand acres of cultivated land). The lake then
breached the dam and eroded a channel through it. The current landscape is
shown in the Landsat image at the top of this page and in the Google satellite
image in the right column.
هیچ نظری موجود نیست:
ارسال یک نظر