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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:
Fri, 18 Sep 2020, 07:33
Middle part of the volcano´s Southwest Rift Zone (image: HVO)
During the past week the Hawaiian Volcano Observatory (HVO) recorded 67 small-magnitude earthquakes on the volcano's summit and upper-elevation flanks. Most of these earthquakes occurred at shallow depths of less than 8 km (~5 miles) below ground level. ... read all
Thu, 27 Aug 2020, 07:40
Thermal image at Mauna Loa at northwest rim captured yesterday (image: HVO)
During the past week the Hawaiian Volcano Observatory (HVO) recorded 144 small-magnitude earthquakes below the volcano's summit and upper-elevation flanks. Most of these earthquakes occurred at shallow depths of less than 8 km (~5 miles) below ground level. ... read all
 

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 | Reports
Mauna Loa volcano books | Tours
Last update: 18 Sep 2020
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
Tue, 27 Oct 2020 (UTC)
27 Oct 6:51 am (GMT -10) (27 Oct 16:51:47 UTC)M 1.7 / 2.3 km7 km22 Km ENE of Honaunau-Napoopoo, Hawaii, USA
27 Oct 1:46 am (GMT -10) (27 Oct 11:46:36 UTC)M 1.8 / 1 km6 km21 Km E of Honaunau-Napoopoo, Hawaii, USA
Mon, 26 Oct 2020 (UTC)
26 Oct 3:10 am (GMT -10) (26 Oct 13:10:23 UTC)M 2.7 / 6.4 km13 km16 Km ENE of Honaunau-Napoopoo, Hawaii, USA
Sat, 24 Oct 2020 (UTC)
24 Oct 4:16 am (GMT -10) (24 Oct 14:16:06 UTC)M 2.3 / 1 km5 km27 Km NNW of Pāhala, Hawaii, USA
24 Oct 3:08 am (GMT -10) (24 Oct 13:08:54 UTC)M 2.4 / 10.5 km16 km23 Km W of Volcano, Hawaii, USA
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.

Background:

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.

Mauna Loa Photos:

Mauna Kea volcano, partly in clouds, Big Island, Hawaii (Photo: Janka)
Mauna Kea volcano, partly in clouds, Big Island, Hawaii (Photo: Janka)
The lava lake and the moon setting above the distant silhouette of Mauna Loa shield volcano. (Photo: Tom Pfeiffer)
The lava lake and the moon setting above the distant silhouette of Mauna Loa shield volcano. (Photo: Tom Pfeiffer)
Halema'uma'u lava lake. Moon about to disappear behind Mauna Loa. (Photo: Tom Pfeiffer)
Halema'uma'u lava lake. Moon about to disappear behind Mauna Loa. (Photo: Tom Pfeiffer)
 


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