Everything about Kohala Mountain totally explained
Kohala, also known as the "Kohala
," is the name of an
extinct volcano on
Hawaii Island in the state of
Hawaii. At its highest elevation, Kohala is above sea level.
Kohala is believed to be the oldest volcano that makes up Hawaii Island, which was formed by the
Hawaii hotspot. It is thought to have breached
sea level about 500,000 years ago. Its eruptive activity began to wane about 300,000 years ago. At about this time, it's thought that the volcano was about twice as wide as it's today. However, because the island of Hawaii is slowly sinking into the
Pacific Ocean's seafloor, the volcano began to sink faster than new eruptions could replace what was being lost to subsidence. Thus, the volcano's size began to recede as it sank below sea level. Kohala's activity continued to wane and it's thought that the volcano last erupted about 120,000 years ago.
As Kohala slowly waned, its southern flanks were buried by the two younger volcanoes,
Mauna Kea and
Mauna Loa. Since Kohala'a southern flanks are buried, it's difficult to determine the size and shape of the volcano when it was at its prime.
About 250,000 to 300,000 years ago, a large
landslide on the northeastern flank of the volcano removed a massive portion of the mountain, estimated to be as much as a section 20 kilometers wide. The part of the mountain removed by the landslide collapsed into the ocean at a very high speed and traveled as much as 130 kilometers across the ocean floor. The large seacliffs on the northeast flank of the volcano mark the headwall of this landslide.
Kohala is named after the district of
Kohala, which exists on the volcano's southwest flank.
Further Information
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