description Mauna Loa Overview
Mauna Loa is the world's largest active volcano by volume and area, covering roughly half of Hawaii's Big Island. Rising 4,169 m above sea level and extending approximately 9 km from the ocean floor, this shield volcano has erupted 34 times since 1843, with its most recent eruption occurring in November 2022. The volcano is monitored continuously by the USGS Hawaiian Volcano Observatory due to its activity and potential hazards to nearby communities.
insights Ranking position
Mauna Loa ranks #27 of 187 in the Mountain ranking, behind Taishan, ahead of Rakaposhi.
help Mauna Loa FAQ
How big is Mauna Loa?
Mauna Loa is the world's largest active volcano by both volume and surface area, covering roughly half of Hawaii's Big Island. While it rises 4,169 meters above sea level, it extends approximately 9 kilometers from the ocean floor to its summit.
When did Mauna Loa last erupt?
The massive shield volcano has erupted 34 times since 1843, with its most recent major eruption occurring in late 2022. The 2022 event ended a 38-year period of quiet, reminding residents of the island of its constant threat.
What type of volcano is Mauna Loa?
It is a classic shield volcano, meaning it was formed by highly fluid, fast-flowing basaltic lava rather than explosive, violent eruptions. This creates broad, gently sloping sides that resemble a warrior's shield.
Is Mauna Loa constantly monitored for eruptions?
Yes, the Hawaiian Volcano Observatory continuously monitors Mauna Loa using seismometers, GPS instruments, and gas sensors. Because lava flows from its eruptions can rapidly reach populated coastal towns, early warning is critical for emergency evacuations.
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