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Random pictures
Mauna Loa volcano with gentle slopes typical of a shield volcano.
Mauna Loa volcano with gentle slopes typical of a shield volcano.

Mauna Loa activity update:
M4.0 earthquake under Mauna Loa today
Tuesday, Sep 06, 2016
A magnitude 4.0 earthquake occurred at 2.4 km depth beneath the summit caldera of the volcano half an hour ago (04:25 am in Hawaii). ... [more]
Weekly earthquake rate of Mauna Loa during the past year (HVO)
Monday, Jul 25, 2016
The volcano is not erupting, but continues to show unrest. Deformation and seismic activity remain above long-term background levels. ... [more]

Mauna Loa volcano

Shield volcano 4170 m / 13,681 ft
Big Island, Hawai'i, 19.48°N / -155.61°W
Current status: restless (2 out of 5)
Mauna Loa webcams / live data
Mauna Loa volcano books | Tours
Last update: 6 Sep 2016
Typical eruption style: Dominantly effusive.
Mauna Loa volcano eruptions: 1832, 1843, 1849, 1851, 1852, 1855-56, 1859, 1865-66, 1868, 1870(?), 1871, 1872, 1873, 1873-74, 1875, 1876, 1877, 1879, 1880, 1880-81, 1887, 1892, 1896, 1899, 1903, 1907, 1914-15, 1916, 1919, 1926, 1933, 1935-36, 1940, 1950, 1975, 1984
TimeMag. / DepthDistanceLocation
Sun, 26 Mar
Sun, 26 Mar 10:05 UTCM 2.5 / 12 km21 km ISLAND OF HAWAII, HAWAII
Sun, 26 Mar 07:53 UTCM 2.4 / 1.8 km14 km- 14km S of Volcano, Hawaii
Sun, 26 Mar 00:43 UTCM 1.9 / 9.2 km2 km- 5km WSW of Volcano, Hawaii
Sat, 25 Mar
Sat, 25 Mar 22:24 UTCM 2.0 / 2.2 km4 km- 5km SW of Volcano, Hawaii
Sat, 25 Mar 10:15 UTCM 1.9 / 2.1 km7 km- 9km SW of Volcano, Hawaii
View all recent quakes
Mauna Loa is the world's largest and one of its most active volcanoes - a giant shield volcano on the Big Island of Hawai'i.


Mauna Loa, world's largest mountain and volcano, is a archetype of a basaltic shield volcano in its late mature stage of life, and only about 600,000-1,000,000 years old. Although not erupting as frequently as its younger neighbor Kilauea, it is also one of the most active volcanoes of the world. When it erupts, its eruptions are usually huge and produce large rivers of lava that have repeatedly threatened the town of Hilo.
Mauna Loa rises almost 9 km above the sea floor and the weight of the massive mountain has depressed the oceanic crust down by about 8 kilometers, so the whole pile of volcanic rocks produced from Mauna Loa is probably about 8+5+4=17 kilometers! It has eruptions both from its summit, occupied by a large caldera, and its NE and SW rift zones on the flanks. Almost 90% of Mauna Loa's surface is is covered by lavas less than 4000 years old, while about 50% of its surface is covered by lavas no older than about 1500 years old, while about 25% are covered by lava flows younger than about 750 years, i.,e. emplaced after the formation of the Mokuaweoweo summit caldera.

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