Diamond Head, Hawaii

{{Short description|Mountain on Oahu in Hawaii, United States of America}}

{{Other uses|Diamond Head (disambiguation){{!}}Diamond Head}}

{{Use mdy dates|date=January 2021}}

{{Infobox mountain

| name = Diamond Head

| photo = Diamond_Head_Hawaii_From_Round_Top_Rd.JPG

| photo_caption = Diamond Head cone seen from Tantalus-Round Top Road

| elevation_ft = 762

| elevation_ref = {{cite web|title=USGS Topo map|url=http://ims.er.usgs.gov/gda_services/download?item_id=5643694&quad=Honolulu&state=HI&grid=7.5X7.5&series=Map%20GeoPDF|access-date=January 19, 2013|archive-date=December 27, 2017|archive-url=https://web.archive.org/web/20171227235711/https://ims.er.usgs.gov/gda_services/download?item_id=5643694&quad=Honolulu&state=HI&grid=7.5X7.5&series=Map%20GeoPDF|url-status=dead}}

| prominence_ft = 596

| prominence_ref = {{cite web|title=Diamond Head|url=http://www.peakbagger.com/peak.aspx?pid=11878|access-date=February 10, 2022}}

| location = Honolulu, Hawaii, US

| range = Hawaiian Islands

| map = United States Oahu#USA Hawaii

| map_caption = none

| range_coordinates =

| coordinates = {{coord|21|15|43|N|157|48|20|W|type:mountain_region:US-HI|display=inline,title}}

| coordinates_ref =

| topo = USGS Honolulu

| type = Volcanic cone

| age = 200,000 years

| easiest_route = Trail

| embedded = {{designation list |embed=yes |designation1=NNL |designation1_date=1968}}

|last_eruption=Unknown

}}

File:View from Diamond Head - 2015 10 30.webm

Diamond Head is a volcanic tuff cone on the Hawaiian island of O{{okina}}ahu. It is known to Hawaiians as Lē{{okina}}ahi ({{IPA|haw|leːˈʔɐhi|pron}}), which is most likely derived from lae (browridge, promontory) plus {{okina}}ahi (tuna) because the shape of the ridgeline resembles the shape of a tuna's dorsal fin.Mary Kawena Pukui, Samuel H. Elbert, Esther K. Mookini, eds. (1964). Place Names of Hawaii, revised and expanded edition. Honolulu: University of Hawai{{okina}}i Press. {{ISBN|0-8248-0524-0}}. Its English name was given by British sailors in the 19th century, who named it for the calcite crystals on the adjacent beach.

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, formed by renewed eruptions from the Ko{{okina}}olau Volcano that took place long after the volcano formed and had gone dormant. These eruptive events created many of O{{okina}}ahu's well-known landmarks, including Punchbowl Crater, Hanauma Bay, Koko Head, and Mānana Island.

Like the rest of the Honolulu Volcanic Series, Diamond Head is much younger than the main mass of the Ko{{okina}}olau Mountain Range. While the Ko{{okina}}olau Range is about 2.6 million years old, Diamond Head is estimated to be about 400,000 to 500,000 years old.{{cite web|date=14 January 2016|title=A geologic tour of the Hawaiian Islands: Oʻahu|url=https://hvo.wr.usgs.gov/volcanowatch/view.php?id=315|url-status=dead|archive-url=https://web.archive.org/web/20161211020218/https://hvo.wr.usgs.gov/volcanowatch/view.php?id=315|archive-date=December 11, 2016|access-date=11 February 2017|work=HVO Volcano Watch|publisher=USGS Hawaiian Volcano Observatory}}

{{Wide image|Diamond Head Crater Bunker.JPG|1200px|View from the rim showing the Waikiki neighborhood (left), the cone (right), and the pillbox at the peak (middle)}}

History

Known as Lēʻahi in Hawaiian, the mountain was given the name Diamond Hill in 1825 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.{{cite book|author=John R. K. Clark|title=Hawai'i Place Names: Shores, Beaches, and Surf Sites|url=https://books.google.com/books?id=K6ChFt5o-qUC&pg=PA60|year=2002|publisher=University of Hawaii Press|isbn=978-0-8248-2451-8|page=60}}

The interior and adjacent exterior areas were the home to Fort Ruger,{{cite web | title = American Seacoast Defenses Forts, Military Reservations and Batteries 1794-1956: Oahu 1922 | url = http://cdsg.org/wp-content/uploads/pdfs/CDSG/CDSG%20WEBSITE%20UPDATES/CDSG%20Downloads/AMERICAN%20SEACOAST%20DEFENSES%20FORTS,%20MILITARY%20RESERVATIONS%20and%20BATTERIES%201794-1945/hawaii/HDHI1921.pdf | website = Coast Defense Study Group (cdsg.org) | access-date = January 19, 2018}} the first United States military reservation on Hawaii.{{cite news | last = Fawcett | first = Denby | title = Tunnel Vision | url = https://www.staradvertiser.com/2014/08/03/features/the-hidden-tunnels-of-diamond-head/ | archive-date = February 1, 2018 | archive-url = https://web.archive.org/web/20180201192850/http://www.staradvertiser.com/2014/08/03/features/the-hidden-tunnels-of-diamond-head/ | work = Star-Advertiser | location = Honolulu | date = August 3, 2014 | access-date = January 31, 2018}} [https://www.pressreader.com/usa/honolulu-star-advertiser/20140803/281496454426131 Alt URL] 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 2002.[https://www.bizjournals.com/pacific/stories/2002/01/07/daily65.html FAA quits Diamond Head crater]

Tourism

{{multiple image|direction=vertical

| image1 = Diamond Head - Side 1.jpg

| image2 = Diamond Head - Side 2.jpg

| footer = Park Brochure: Diamond Head State Monument

}}

Diamond Head is a defining feature of the view known to residents and tourists of Waikiki, 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. 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 Waikiki and the south shore of Oahu.{{cite web|title = Diamond Head Lookout|url = http://www.pearlharborwebsite.com/honolulu-city-tours-itinerary/diamond-head-lookout/|website = Pearl Harbor Website|access-date = 2015-10-19|language = en}}

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

See also

References

{{reflist}}