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Māhukona

Māhukona
Māhukona is located in Hawaii
Māhukona
Location in Hawaii
Elevation −3,770 feet (−1,149 m)
Location
Location Hawaii, US
Range Hawaiian Islands
Coordinates
Topo map USGS Kamuela
Geology
Type Shield volcano, Hotspot volcano
Volcanic arc/belt Hawaiian-Emperor seamount chain
Last eruption About 470,000 BP

Māhukona is a submerged shield volcano on the northwestern flank of the Island of Hawaiʻi. A drowned coral reef at about 3,770 feet (-1,150 m) below sea level and a major break in slope at about 4,400 feet (-1,340 m) below sea level represent old shorelines. The summit of the shield volcano was once 800 feet (250 m) above sea level. It has now subsided below sea level. A roughly circular caldera marks the summit of Māhukona. A prominent rift zone extends to the west. A second rift zone probably extended to the east but has been buried by younger volcanoes. The main shield-building stage of volcanism ended about 470,000 years ago. The summit of the shield volcano subsided below sea level between 435,000 and 365,000 years ago.[1] This makes Māhukona the oldest volcano to build Hawaiʻi island, compared to Kohala to the east and Hualālai to the southeast.[2] The Monterey Bay Aquarium Research Institute investigated the area with a remotely controlled submarine in 2001.[3]

It was named for the area known as Māhukona on the shore to the northeast.[4]

References

  1. ^ "Mahukona, Hawaii". Volcano World. Oregon State University. Retrieved June 23, 2010.  attributed to:
    David A. Clague; James G. Moore (April 1991). "Geology and Petrology of Mahukona Volcano". Hawaii: Bulletin of Volcanology 53 (3): 159–172.  
  2. ^ "Volcanoes of the Big Island". Volcano Watch. Hawaiian Volcano Observatory. September 15, 1995. Retrieved June 23, 2010. 
  3. ^ "Hawaii Cruise: March 13, 2001 to June 2, 2001". Monterey Bay Aquarium Research Institute. Retrieved June 23, 2010. 
  4. ^ U.S. Geological Survey Geographic Names Information System: Māhukona

Further reading

  • David A. Clague; Andrew T. Calvert (July 2009). "Postshield stage transitional volcanism on Mahukona Volcano, Hawaii". Hawaii: Bulletin of Volcanology 71 (5): 533–539.  


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