Diamond Head is a volcanic tuff cone on the Hawaiian island of Oʻahu and known to Hawaiians as Lēʻahi (pronounced [leːˈʔɐhi]). The Hawaiian name is most likely derived from lae (browridge, promontory) plus ʻahi (tuna) because the shape of the ridgeline resembles the shape of a tuna's dorsal fin.[3] Its English name was given by British sailors in the 19th century, who named it for the calcite crystals on the adjacent beach.

Diamond Head
Diamond Head cone seen from Tantalus-Round Top Road
Highest point
Elevation	762 ft (232 m)[1]
Prominence	596 ft (182 m)[2]
Coordinates	21°15′43″N 157°48′20″W
Geography
Diamond Head
Location	Honolulu, Hawaii, US
Parent range	Hawaiian Islands
Topo map	USGS Honolulu
Geology
Age of rock	200,000 years
Mountain type	Volcanic cone
Last eruption	Unknown
Climbing
Easiest route	Trail
U.S. National Natural Landmark
Designated	1968

Geology

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. These eruptive events 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 400,000 to 500,000 years old.[4]

View from the rim showing the Waikīkī neighborhood (left), the cone (right) and the pillbox at the peak (middle)

History

Known as Lēʻahi in Hawaiian, the mountain in 1825 was given the name Diamond Hill by British sailors who discovered sparkling volcanic calcite crystals in the sand and mistook them for diamonds. This is reflected in another local name, Kaimana Hila. The name later became Diamond Head, with head being shortened from headland.[5]

The interior and adjacent exterior areas were the home to Fort Ruger,[6] the first United States military reservation on Hawaii.[7] 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.[7] An FAA air traffic control center was in operation from 1963 to 2002.[8]

Tourism

Park Brochure: Diamond Head State Monument

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 Landmark

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.[6] 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.[9]

The Diamond Head Lighthouse, a navigational lighthouse built in 1917 is directly adjacent to the crater's slopes.[6] In addition, a few pillboxes are located on Diamond Head's summit.[6]

In popular culture

Diamond Head appears on an 80-cent air mail stamp issued in 1952 to pay for shipping orchids to the mainland of the U.S.[10]

A 1975 televised game show, The Diamond Head Game, was set at Diamond Head.[11]

The Crater was the location of several concerts in the 1960s and 1970s.[12] 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 1960s and '70s, attracting over 75,000 attendees for performances of the Grateful Dead, Santana, America, Styx, Journey, War, and Tower of Power, alongside Hawaiian talent like Cecilio & Kapono and the Mackey Feary Band.[12][13][14][15] 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.[14] Many items from the bands were brought into and out of the Crater by helicopter.[14]

• Various views of Diamond Head
• 
  A view from the ocean of Diamond Head
• 
  Diamond Head cone seen from the coast off Waikīkī
• 
  View from Rocky Hill, which resides over Punahou School
• 
  Diamond Head peak from Kapiolani Park
• 
  Diamond Head seen from Waikīkī in the 1800s
• 
  Waikiki Beach facing Diamond Head, 1958
• 
  Aerial view of the cone, and the Kahala and Kaimuki neighborhoods
• 
  Aerial view of the Diamond Head
• 
  A view from the south, including Diamond Head Lighthouse

See also

• Diamond Head Lighthouse
• Diamond Head Theatre
• Kapiolani Community College

References

External links

Wikimedia Commons has media related to Diamond Head.

• Official website Hawaii State Parks - Diamond Head State Monument
• Geographic data related to Diamond Head, Hawaii at OpenStreetMap
• Satellite image of Diamond Head (Google Maps)

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