On the Island of Hawaiʻi, Mauna Loa, the largest volcano on Earth, has erupted 33 times since written descriptions became available in 1832. Activity year . It has produced large, voluminous flows of basalt that have reached the ocean eight times since 1868.

This past week, about 65 small-magnitude earthquakes were recorded beneath the upper-elevations of Mauna Loa; most of these occurred at shallow depths of less than 8 kilometers (~5 miles). Its long submarine flanks descend an additional 5 km (3 mi) below sea level to the ocean floor.

Thermal webcams record heat rather than light and get better views through volcanic gas. Data courtesy of NOAA. Mauna Loa, the largest volcano on Earth, has erupted 33 times since written descriptions became available in 1832.

Note that all except Johnston Island are across the International Date Line from Hawaii. Once underway, its eruptions can produce lava flows that may reach the sea in less than 24 hours, severing roads and utilities. A very active volcano, it has produced large, voluminous flows of basalt (very fluid, dark lava) that have reached the ocean eight times since 1868. Thermal webcams record heat rather than light and get better views through volcanic gas. Some eruptions began with only brief seismic unrest, while others followed several months to a year of increased seismicity. For a more comprehensive listing, please see Wright, T.L., and Takahashi, T.J., 1998, Hawai‘i bibliographic database, Bulletin of Volcanology, v. 59, p. 276-280.
The United States Geological Survey maintains a hazard zone mapping of the island done on a one to nine scale, with the most dangerous areas corresponding the smallest numbers. In 2019, the Volcano Alert Level for Mauna Loa was elevated from “NORMAL” to “ADVISORY” due to increased seismicity and deformation at the volcano. Once underway, its eruptions can produce lava flows that may reach the sea in less than 24 hours, severing roads and utilities. USGS Volcano Science Center Mauna Loa monitoring: Volcano Monitoring Data for Mauna Loa. Background: Mauna Loa is the largest active volcano on our planet, rising gradually to 4,170 m (13,681 ft) above sea level. Organization, jobs, budget What will you do when it does? Mauna Loa is among Earth's most active volcanoes, having erupted 33 times since its first well-documented historical eruption in 1843.

It last erupted in 1984, when a lava flow came within 7.2 km (4.5 mi) of Hilo, the largest population center on the island.

This alert level does not mean an eruption is imminent, but it is a fact that Mauna Loa, which has erupted 33 times since 1843 (most recently in 1984), will erupt again.


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