Diamond Head, Hawaii
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Diamond Head is a volcanic tuff cone on the Hawaiian island of Oʻahu and known to Hawaiians as Lēʻahi, most likely from lae 'browridge, promontory' plus ʻahi 'tuna' because the shape of the ridgeline resembles the shape of a tuna's dorsal fin. Its English name was given by British sailors in the 19th century, who mistook calcite crystals on the adjacent beach for diamonds.
Diamond Head cone seen from Tantalus-Round Top Road
|Elevation||762 ft (232 m) |
|Prominence||596 ft (182 m) |
|Location||Honolulu, Hawaiʻi, US|
|Parent range||Hawaiian Islands|
|Topo map||USGS Honolulu|
|Age of rock||200,000 years|
|Mountain type||Volcanic cone|
Diamond Head is part of the system of cones, vents, and their associated eruption flows that are collectively known to geologists as the Honolulu Volcanic Series, eruptions from the Koʻolau Volcano that took place long after the volcano formed and had gone dormant. The Honolulu Volcanic Series is a series of volcanic eruption events that created many of Oʻahu's well-known landmarks, including Punchbowl Crater, Hanauma Bay, Koko Head, and Mānana Island in addition to Diamond Head.
Diamond Head, like the rest of the Honolulu Volcanic Series, is much younger than the main mass of the Koʻolau Mountain Range. While the Koʻolau Range is about 2.6 million years old, Diamond Head is estimated to be about 500,000 to 400,000 years old.
The interior and adjacent exterior areas were the home to Fort Ruger, the first United States military reservation on Hawaii. Only Battery 407, a National Guard emergency operations center, and Birkhimer Tunnel, the Hawaii State Civil Defense Headquarters (HI-EMA), remain in use in the crater. An FAA air traffic control center was in operation from 1963 to 2007.
Diamond Head is a defining feature of the view known to residents and tourists of Waikīkī, and also a U.S. National Natural Monument. The volcanic tuff cone is a State Monument. While part of it is closed to the public and serves as a platform for antennas used by the U.S. government, the crater's proximity to Honolulu's resort hotels and beaches makes the rest of it a popular destination.
National Natural LandmarkEdit
In 1968, Diamond Head was declared a National Natural Landmark. The crater, also called Diamond Head Lookout was used as a strategic military lookout in the early 1900s. Spanning over 475 acres (190 ha) (including the crater's interior and outer slopes), it served as an effective defensive lookout because it provides panoramic views of Waikīkī and the south shore of Oahu.
In popular cultureEdit
The Crater was the location of several concerts in the 1960s and 1970s. First held on New Year's Day, 1969, and often known as Hawaiian Woodstock, Diamond Head Crater Festivals, sometimes called Sunshine Festivals, were all-day music celebrations held in the '60's & '70's attracting over 75,000 in attendance for performances of the Grateful Dead, The Rolling Stones (3 times), Carlos Santana, America, Styx, Journey, War, and Tower of Power, alongside Hawaii talent like Cecilio & Kapono and the Mackey Feary Band. These one day festivals became two day events in 1976 and 1977, but were cancelled by the Hawai'i Department of Land and Natural Resources because of community noise and environmental impact concerns. Many items from the bands were brought into and out of the Crater by helicopter.
- USGS Topo map at http://ims.er.usgs.gov/gda_services/download?item_id=5643694&quad=Honolulu&state=HI&grid=7.5X7.5&series=Map%20GeoPDF
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