![]() The first record historically witnessed volcanic eruption from Mauna Loa was in January 1983.So far in history, it is recorded to have erupted 33 times from 1843, once every five years on an average. The most recent eruption from Mauna Loa was recorded from 24th March to 15th April in 1984.The magma that flows out of Mauna Loa is from the Hawaii hotspot that created the Hawaiian Island chain over millions of years.The findings indicate that it emerged above sea level around 400,000 years ago. As per records, it is found that the shield active volcano has been erupting for over 700,000 years.The shield-stage lava forming the slopes of the volcano is tholeiitic basalt which is made from a mix of magma and subducted oceanic crust.The lava from Mauna Loa is poor in silica, fluid, and non-explosive. It is one of the five volcanoes that form the Island of Hawaii but the largest one in mass and size.It has gentle slopes formed by the flow of the thin layer of lava which is low in viscosity. It is an active shield volcano formed by the eruption of highly fluid lava.The summit caldera of Mauna Loa is known as Moku‘āweoweo with an area of 15 square km and a depth of 180 metres. The dome of the volcano is 120 km long and 103 km wide covering almost 51% of the Hawaiian Island.It is the largest subaerial volcano in both mass and volume at an elevation of 13, 679 ft from the sea level and a total of 30,000 ft from the sea bed.It is located on the Pacific Ocean and rises from the sea bed. An interesting fact about Mauna Loa is that it is the second-largest active volcano on Earth after Tamu Massif. ![]() The topic includes important information on the volcano and its past eruptions and formation. It rises from the bottom of the sea bed in the Pacific Ocean and rises at a height of 30, 000 feet from the sea level. Mauna Loa means “long mountain” in Hawaiian and makes up nearly 51% of the Hawaiian Island. It is one of the five volcanoes that form the Island of Hawaii located in the United States. Mauna Loa rises at an elevation of 13, 679 ft (4.169 m) and is the second-largest active volcano in the world. The dormant volcanoes are the ones that are not erupting whereas the active volcanoes are the ones that continue to erupt. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawaiʻi and American Samoa.Volcanoes are of different types including dormant and active volcanoes. The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. This notice contains volcanoes not displayed here: Hualalai (NORMAL/GREEN), Haleakala (NORMAL/GREEN), Mauna Kea (NORMAL/GREEN), Kama'ehuakanaloa (UNASSIGNED/UNASSIGNED). Mauna Loa activity summary also available by phone: (808) 967-8866. ![]() Since its first well-documented eruption in 1843, the volcano has erupted 34 times with intervals between eruptions ranging from months to decades. Mauna Loa eruptions typically start at the summit and, within minutes to months of eruption onset, can migrate into either the Northeast or Southwest Rift Zone, or radial vents on the north flank. Eruptions tend to produce voluminous, fast-moving lava flows that can impact communities on the east and west sides of the Island. HVO continues to closely monitor the volcano and will issue another update in one month, or earlier should conditions change significantly.īackground: Mauna Loa is the largest active volcano on our planet and covers half of the Island of Hawaiʻi. Gas and temperature data from a station on the Southwest Rift Zone showed no significant changes in the past month. All earthquakes below the volcano's summit and upper-elevation flanks were of small magnitudes (below M3.0).ĭata from Global Positioning System (GPS) instruments on Mauna Loa indicated slow inflation as magma replenishes the summit reservoir system. The rate of earthquakes deeper than 13 kilometers (8 miles) beneath and southwest of Mauna Loa's summit caldera remained slightly elevated during the past month, following a notable increase in July. HAWAIIAN VOLCANO OBSERVATORY MONTHLY UPDATE Alert Level: NORMAL, Color Code: GREEN 19:30:38 UTC
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