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Half Dome
Half Dome is a granite dome at the eastern end of Yosemite Valley in Yosemite National Park, California. It is possibly Yosemite's most familiar rock formation. The granite crest rises more than above the valley floor.
==Geology==
The impression from the valley floor that this is a round dome that has lost its northwest half is an illusion. From Washburn Point, Half Dome can be seen as a thin ridge of rock, an arête, that is oriented northeast-southwest, with its southeast side almost as steep as its northwest side except for the very top. Although the trend of this ridge, as well as that of Tenaya Canyon, is probably controlled by master joints, 80 percent of the northwest "half" of the original dome may well still be there.
On March 28, 2009, a large rock slide of occurred from Ahwiyah Point.〔(【引用サイトリンク】title=Ahwiyah Point Rockfall Size Estimated )〕 The slide happened at 5:26 a.m. and damaged a large area under the dome. No one was injured, but hundreds of trees were knocked down, and a portion of the Mirror Lake trail was buried. The slide registered on seismographs as an earthquake reaching 2.5 on the Richter Scale.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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