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Transcript of Mauna Loa
The Hawaiin name means "Long Mountain"
the subaerial part extends for about 120 miles- from the southern tip of the island to the summit caldera and then east-northeast to the coastline near Hilo.
Origin of Name
The Mauna Loa volcano is a shield-forming volcano
Type of Volcano
Age: estimated to have collapsed 600-750 years ago
When was it formed?
The Mauna Loa is one of Earth's most active volcanos. It has erupted 33 times since its first well-documented historical eruption in 1843
more than 4 km above sea level
largest volcano on the planet
Its long submarine flanks descend to the sea floor an additional 5 km, and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km. This makes the volcano's summit about 17 km (56,000 ft) above its base! The enormous volcano covers half of the Island of Hawai`i and by itself amounts to about 85 percent of all the other Hawaiian Islands combined.
size of volcano
caused by a "hot spot"
right in the middle of one of the largest crustal plates on Earth - the Pacific Plate
March 24-April 15, 1984
Type of Lava Flow
generally very fluid lava flows
has produced both aa and pahoehoe flows
lesser amounts of pyroclastics
Impact on Enviroment
Mauna Loa is a type of volcano called a "shield" volcano, which traditionally does not produce violent eruptions.
Poisnous/Volcanic gas which can destroy crops and livestock
Effect on Humans
destruction of homes and property
capable of wiping out towns
Precursors to Eruption
the estimated age of of earliest subaerial eruption is 400,00 years ago
estimated age of first eruption of Mauna Loa is between 100,000,000 and 700,000 years before present
oldest dated rocks are between 100,00 and 200,000 years ago
Modern Eruptive Period
March 24-April 15, 1984
covers more than 50% of Hawaii Island
Worlds largest active volcano
500 times greater in volume than Mount Rainier, the picturistique volcano in Washington state
one of 5 Hawaiin volcanos
In 1984 Mauna Loa last erupted , sending lava within 4.5 miles of Hilo (southernmost portion of the Island) during an eruption between March 24 and April 15