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Waimea Canyon, also known as the Grand Canyon of the Pacific, is a large canyon, approximately ten miles long and up to 3,000 feet deep, located on the western side of Kauai in the Hawaiian Islands of the United States. Waimea is Hawaiian for "reddish water", a reference to the erosion of the canyon's red soil. The canyon was formed by a deep incision of the Waimea River arising from the extreme rainfall on the island's central peak, Mount Waialeale, among the wettest places on earth.
Geologically the canyon is carved into the tholeiitic and post-shield calc-alkaline lavas of the canyon basalt. The lavas of the canyon provide evidence for massive faulting and collapse in the early history of the island. The west side of the canyon is all thin, west-dipping lavas of the Napali Member, while the east side is very thick, flat-lying lavas of the Olokele and Makaweli Members. The two sides are separated by an enormous fault along which a large part of the island moved downwards in a big collapse.
The canyon has a unique geologic history�it was formed not only by the steady process of erosion, but also by a catastrophic collapse of the volcano that created Kauai.
Like the other Hawaiian islands, Kauai is the top of an enormous volcano rising from the ocean floor. With lava flows dated to about 5 million years ago, Kauai is the oldest of the large Hawaiian islands. Roughly 4 million years ago, while Kauai was still erupting almost continuously, a portion of the island collapsed. This collapse formed a depression, which then filled with lava flows.
In the time since, rainwater from the slopes of Mount Waialeale have eroded Waimea Canyon along one edge of the collapse. The cliffs on the west side of the canyon are composed of thin lava flows that ran down the surface of the Kauai volcano. On the other side of the canyon, the cliff walls are built from thick lava flows that pooled in the depression. Over time, the exposed basalt has weathered from its original black to bright red.
Waimea Canyon State Park encompasses 1,866 acres and is a popular tourist attraction on the island. It provides a wilderness area with numerous hiking trails. It can be accessed from Waimea on Hawaii state road 550, which is 18 miles long and leads up to Kokee State Park.
July 19th, 2013
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