East Molokai Volcano
Wailau
Aerial photo of the southwestern flank of East Molokai Volcano
Highest point
Elevation1,512 m (4,961 ft)
Coordinates21°07′N 156°50′W / 21.11°N 156.84°W / 21.11; -156.84
Geography
LocationMolokai, Hawaii,
United States
Parent rangeHawaiian Islands
Geology
Mountain typeShield volcano
Volcanic arc/beltHawaiian-Emperor seamount chain

The East Molokai Volcano, sometimes also known as Wailau for the Wailau valley on its north side,[1] is an extinct shield volcano comprising the eastern two-thirds of the island of Molokaʻi in the U.S. state of Hawaii.

Description

The East Molokai has a width of 70 km (43 mi) and a length of 150 km (93 mi). It is overlapped by the West Molokai, Lanai and Haleakalā shield volcanoes. Its shield formation began two million years ago and ended 1.5 million years ago whereas its postshield eruptions occurred 1.5 to 1.3 million years ago. The pahoehoe shield volcano of the Kalaupapa Peninsula postdates the main shield volcano of East Molokai and is considered to represent the last volcanic phase of East Molokai.[1]

East Molokai was one of the seven principal volcanoes, along with West Molokai, Lānaʻi, West Maui, East Maui, Penguin Bank and Kahoʻolawe, that formerly constituted the island of Maui Nui.

The highest point is the peak called Kamakou on the southern rim, at 21°6′23″N 156°52′5″W / 21.10639°N 156.86806°W / 21.10639; -156.86806 (Kamakou).[2][3] The Pēpēʻōpae bog is just below the rim.[4]

The northern flank of the volcano has been truncated by enormous cliffs rising 900 m (3,000 ft) from the sea. The sea cliffs were formed when the northern third of the East Molokai Volcano suddenly collapsed and slid off into the sea, about 1.4 million years ago. The landslide was so fast and powerful that it extended 190 km (120 mi) into the sea, and generated a 600 m (2,000 ft)-high megatsunami that inundated the rest of Molokai and severely damaged the surrounding Hawaiian Islands before eventually reaching the coastlines of California and Mexico.[5]

See also

References

  1. 1 2 Wood, Charles A.; Kienle, Jürgen (2001). Volcanoes of North America: United States and Canada. Cambridge, England: Cambridge University Press. p. 328. ISBN 978-0-521-43811-7. OCLC 27910629.
  2. ↑ U.S. Geological Survey Geographic Names Information System: Kamakou
  3. ↑ Mary Kawena Pukui; Samuel Hoyt Elbert; Esther T. Mookini (2004). "lookup of Kamakou ". in Place Names of Hawai'i. Ulukau, the Hawaiian Electronic Library, University of Hawaii Press. Retrieved November 12, 2010.
  4. ↑ U.S. Geological Survey Geographic Names Information System: Pēpē‘ōpae
  5. ↑ "Kalaupapa Settlement Boundary Study. Along North Shore to Halawa Valley, Molokai" (PDF). National Park Service. 2001. Retrieved 2020-06-29.
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