Since then, the volcano has remained active, with a history of effusive and explosive eruptions, including 33 eruptions since the first well-documented eruption in In addition, much of the mountain is invisible even underwater: The shield-stage lavas that built the enormous main mass of the mountain are tholeiitic basaltslike those of Mauna Keacreated through the mixing of primary magma and subducted oceanic crust.
HVO image fromperson for scale. It is pictured above rising 13, ft. SinceMauna Loa has erupted 39 times; its last eruption was in According to USGS estimates, the volcano has erupted an average of once every 6 years over the past Since it has erupted 33 times producting lavas that have covered over km2.
The image at Mauna loa shows Mauna Loa lava flows since warm colors overlain on a 3-d digital elevation model. The view is looking towards the west, with Hilo qt the bottom Mauna loa, Kilauea at left, and Kona coast on the north.
At 60 miles long and 30 miles wide, it makes up half of the entire island. When one considers that the flanks of Mauna Loa sit on sea floor that is about 16, ft 5, M deep, the "height" of this volcano relative to neighboring land the sea floor is more like 30, ft 9, m!
Mauna Loa is the largest active volcano in the world. In fact, using this last measure of its height, it is one of the tallest mountain in the world although many mountains, such Mauna loa Mt. Everest in the Himalaya mountain range, sit higher relative to sea level.
So, directly beneath Mauna Loa, the sea floor on which it sits is depressed by and additional 26, ft m. Thus, if one wanted to say how thick at its center is the lava pile that makes up Mauna Loa, one would need to add its above sea level height, its sea floor to sea level height, and the thickness of its depression in the Pacific sea floor.
These total 56, ft 17, m. For more details about estimation of the actual thickness of Mauna Loa volcano, see the write up on "How high is Mauna Loa volcano" at the HVO website. The summit of Mauna Loa began inflating slowly between and after a decade of slight deflation, after experiencing a brief swarm of deep long-period earthquakes.
But, inflation was fairly steady in and the first half of following a more intense swarm of several thousand deep earthquakesin lateall of which suggested that the magma reservoir within the volcano was swelling.
Then inflation slowed again inceased in lateand resumed slowly in latecontinuing through mid i. Im late AugHVO raised the alter level at Mauna Loa because of long-term increased seismicity rates and inflation of the summit as measured by cross-caldera difference.
Earthquakes activity increased in early July and continued through Fallbut then slowed significantly throughout and remained at a level of about 10 a week. Activity peaked in Sept. That earthquake swarm was the greatest number of such earthquales since the beginning of the modern HVO earthquake catalog in the s.
HVO scientists continue to monitor the volcano closely. Views of some data that led to the Aug activity status upgrade: The last decade of seismicity and deformation at Mauna Loa. Image redrafted from HVO website Get Mauna Loa activity updates from the HVO website A peaceful Mauna Loa as viewed from the summit of Kilauea volcano in March of Mauna Loa is a "shield volcano", which means it is a gently sloping mountain produced from a large number of generally very fluid lava flows.
The volcano is constructed of a rock type known as tholeiitic basalt. Mauna Loa shares the Hawaiian hot spot with its smaller active siblings Kilauea and Loihi seamount. You can view a schematic representation of the geometry of this situation HERE.
If you would like to learn more about how the Hawaiian islands formed from a single mantle hotspot, visit the Formation of the Hawaiian Islands web page at this site.
The earliest written account of a Mauna Loa eruption, based upon the observations of an elderly guide Keaweehu in the Wilkes exploration party to the summit insays an eruption took place in Inand an eruption from Mauna Loa caused the largest recorded earthquake in Hawaii, a magnitude 8 by modern standards.
The lava flow of is said to be one of the greatest flows ever seen by modern observers. An eye witness account by the Rev. Titus Coan is available at this web site The oldest remnants of subaerial Mauna Loa are to be found in an interesting rock formation known as the "Ninole Volcanic Series". These hills form the so-called "Ninole Shield" which is thought to be either the remnants of a pre-Mauna Loa volcano, or uplifted blocks of old Mauna Loa from within the Honuapo-kaoiki fault system.
Either way, they are some of the oldest exposed rocks on the southern part of the island.Follow site author @kenrubin on Twitter and see his recent Mauna Loa tweets below: Tweets about Mauna Loa @kenhrubin Mauna Loa, or "Long Mountain" in Hawaiian, is located on the island of Hawaii.
10% OFF YOUR FIRST ORDER when you sign up for the latest news from MAUNA LOA. Over 30 years ago, MAUNA LOA started perfecting Hawaii's most sought after nut.
Since then, MAUNA LOA's created a delightful variety of macadamia nut treats, with over 14 flavors to choose from. MAUNA LOA leads the way in proving the tastiest choices in . Rising gradually to more than 4 km (13, ft) above sea level, Mauna Loa is the largest active volcano on our planet.
Its long submarine flanks descend to the sea floor an additional 5 km (16, ft), and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km (26, ft). The Mauna Loa summit cabin on the rim of Moku'aweoweo at 13, feet has 12 bunks with mattress pads.
Cabins have attached water catchment tanks. Check on current water levels when obtaining your permit. Nov 05, · The graph shows recent monthly mean carbon dioxide measured at Mauna Loa Observatory, Hawaii. The last four complete years of the Mauna Loa CO 2 record plus the current year are shown.
Data are reported as a dry air mole fraction defined as the number of molecules of carbon dioxide divided by the.