Mauna Loa
2007 Schools Wikipedia Selection. Related subjects: Geology and geophysics; North American Geography
| Mauna Loa | |
|---|---|
 Eruption of Mauna Loa, March 1984. |
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| Elevation | 4,169 m (13,679 ft) |
| Location | Hawaii, USA |
| Range | Hawaiian Islands |
| Coordinates | |
| Topo map | USGS Mauna Loa |
| Type | Shield volcano |
| Age of rock | < 200 kyr |
| Last eruption | 1984 |
| Easiest route | jeep trail |
Mauna Loa is an active shield volcano in the Hawaiian Islands, one of five volcanoes that form the Island of Hawaii. It is Earth's largest mountain, with a volume estimated at approximately 18,000 cubic miles (75,000 km³), although its peak is about 36 m (120 ft) lower than that of its neighbour, Mauna Kea. In Hawaiian, mauna loa means "long mountain". Lava erupted from Mauna Loa is very fluid, and the volcano has extremely shallow slopes as a result.
The volcano has probably been erupting for at least 700,000 years and may have emerged from the sea about 400,000 years ago, although the oldest known dated rocks do not extend beyond 200,000 years. Its magma comes from a hotspot in the Earth's mantle far beneath the island that has been responsible for the creation of the Hawaiian island chain for tens of million of years. The slow drift of the Pacific Plate will eventually carry the volcano away from the hotspot, and the volcano will thus become extinct within 500,000 to one million years from now.
Mauna Loa's most recent eruption occurred in 1984. No recent eruptions of the volcano have caused fatalities, but eruptions in 1926 and 1950 destroyed villages, and the city of Hilo is partly built on lava flows from the late 19th century. In view of the hazards it poses to population centers, Mauna Loa is part of the Decade Volcanoes program, which encourages studies of the most dangerous volcanoes. Mauna Loa has been intensively monitored by the Hawaiian Volcano Observatory (HVO) since 1912. Observations of the atmosphere are undertaken at the Mauna Loa Observatory, and of the Sun at the Mauna Loa Solar Observatory, both located near its summit. Hawaii Volcanoes National Park covers the summit and the south-eastern flank of the volcano, including a separate volcano, Kilauea.
Eruption history
Origins
Mauna Loa probably began erupting between 700,000 and one million years ago, and has grown steadily since then. Like all of the Hawaiian islands, Mauna Loa has its origins in a hotspot—a plume of magma rising from deep in the Earth's mantle. The hotspot remains in a fixed position, while the Pacific Plate drifts over it at a rate of about 10 cm per year. The upwelling of the hot magma creates volcanoes, and each individual volcano erupts for a few million years before the movement of the plate carries it away from the rising magma.
The hotspot has existed for at least 80 million years, and the Emperor Seamounts chain of old volcanoes stretches almost 5,800 km (3,600 miles) away from the hotspot. Currently, the hotspot feeds activity at five volcanoes: Mauna Loa, Kilauea, and Hualalai on the Big Island, Haleakala on Maui, and Loihi, a submarine volcano south of the Big Island and the youngest Hawaiian volcano. Mauna Loa is the largest of these, although currently Kilauea is the site of the most intense volcanic activity.
Prehistoric eruptions
Prehistoric eruptions of Mauna Loa have been extensively analysed by carrying out radiocarbon dating on fragments of charcoal found beneath lava flows. The mountain's prehistoric activity is probably the best known of any volcano. Studies have shown that a cycle occurs in which volcanic activity at the summit is dominant for several hundred years, after which activity shifts to the rift zones for several more centuries, and then back to the summit again. Two cycles have been clearly identified, each lasting 1,500–2,000 years. This cyclical behaviour is unique to Mauna Loa among the Hawaiian volcanoes.
Further back, records show that between about 7,000 and 6,000 years ago, Mauna Loa was largely inactive. The cause of this cessation in activity is not known, and no known similar hiatus has been found at other Hawaiian volcanoes except for those currently in the post-shield stage. Between 11,000 and 8,000 years ago, activity was more intense than it is today. However, Mauna Loa's overall rate of growth has probably begun to slow over the last 100,000 years, and in fact may be nearing the end of its tholeiitic basalt shield-building phase.
Historic eruptions
Although native Hawaiians have witnessed eruptions for many centuries, written records only exist for eruptions that have occurred since the early 1800s. The first historical eruption occurred in 1832, and since then 39 eruptions have been documented. In total, these eruptions have covered over 800 km² of the volcano's flanks with lava flows. Typically, eruptions have been brief but intense, with 0.25-0.5 km³ of lava erupted over a few weeks. Until 1950, eruptions occurred roughly every 3-4 years, but since then the repose periods have dramatically lengthened with the only eruptions occurring in 1975 and 1984.
The two most recent eruptions have been the most extensively studied. The 1975 eruption lasted only two days, and occurred at the summit of the mountain. The 1984 eruption saw fissures open up to the northwest and southeast, from the summit down to 2,900 m above sea level. Flows from this eruption headed rapidly towards the city of Hilo, but stopped about 4 km from the outskirts when the eruption ended after three weeks.
Current activity
The volcano has been dormant since 1984. Seismic activity remained low until 2002, when there was a sudden onset of inflation and the caldera walls started to move apart at a rate of 5 cm per year. This is thought to indicate that magma is filling a reservoir about 5 km beneath the summit. The inflation has been intermittent, sometimes slowing, and sometimes stopping for several weeks. Thus far, though, it has always restarted, and this is likely to indicate an increased probability of an eruption in the next few years.
The inflation has been accompanied by increased seismic activity. A swarm of deep earthquakes began in July 2004, and continued until the end of the year. Earthquakes were detected at a rate of one per day for the first three weeks, increasing steadily over subsequent months to 15 or so per day by the end of the year. The swarm ended in December 2004, and earthquake levels have been only moderately elevated since then.
Relationship with Kilauea
Kilauea lies on the southern flank of Mauna Loa and was originally thought to be a satellite vent of Mauna Loa. However, chemical differences between the lavas from the two volcanoes show that they have separate shallow magma chambers, and so they are now considered separate volcanoes. Nevertheless, activity patterns at the two volcanoes do appear to be correlated.
The most apparent relation between the two mountains is that, generally, periods of frequent activity at one volcano coincide with periods of low activity at the other. For example, between 1934 and 1952, Kilauea was dormant and only Mauna Loa was active, while from 1952 to 1974, only Kilauea was active while Mauna Loa lay dormant.
The 1984 eruption of Mauna Loa started during an eruption at Kilauea, but had no discernible effect on the Kilauea eruption. Occasionally, though, eruptions at one volcano do seem to influence activity at the other. The recent inflation of Mauna Loa's summit began on the same day as a new large lava flow broke out at Kilauea's Puu Oo crater, and geologists have suggested that a 'pulse' of magma entering Mauna Loa's deep plumbing system could have increased pressure inside Kilauea and triggered the eruption.
Hazards
Volcanic eruptions in Hawaii rarely cause fatalities—the only fatality due to volcanic activity there in the last century occurred at Kilauea in 1924 when an unusually explosive eruption hurled rocks at onlookers, killing one . However, property damage is common. Mauna Loa is a Decade Volcano, which means it has been identified as worthy of particular research in light of its frequent eruptions and proximity to populated areas. Many towns and villages near the volcano are built on lava which has erupted in the last two hundred years, and there is a very strong likelihood that future eruptions will cause damage to populated areas.
Lava flows
The main volcanic hazard at Mauna Loa is lava flows. Most flows advance at about walking pace, and so present little danger to human life, but eruptions at Mauna Loa can be more intense than those at Kilauea; for example, the 1984 eruption emitted as much lava in three weeks as Kilauea's current eruption produces in three years. Such high emission rates can generate comparatively fast-moving flows.
Two eruptions of Mauna Loa have destroyed villages. In 1926, the village of Hoopuloa Makai was overrun by lava flows, while in 1950, the most voluminous eruption ever seen at Mauna Loa sent lava flows racing towards the sea, and the village of Hookena Mauka was destroyed on 2 June 1950 by the advancing flows. Hilo is partly built on lava from an 1880 eruption, and is at risk from further lava flows. The brief but intense 1984 eruption saw lava flow towards Hilo but it had not reached any buildings when the eruption stopped.
Flank collapse
A greater but rarer hazard at Mauna Loa is the possibility of a sudden massive collapse of the volcano's flanks. Deep faults allow large portions of the sides of Hawaiian mountains to slide gradually downwards, the best known example being the Hilina Slump. Occasionally, a large earthquake can trigger a collapse of the flank, creating a massive landslide which may trigger a tsunami. Kealakekua Bay, on the western slope of Mauna Loa, was created by such an event. Undersea surveying has revealed numerous landslides along the Hawaiian chain, and two giant tsunamis are known to have occurred: 200,000 years ago, Molokai experienced a 75 m tidal wave, and 100,000 years ago, a tsunami 325 m high struck Lanai.
A recent example of the risks associated with slumps occurred in 1975, when the Hilina Slump suddenly moved forward by several meters. A magnitude-7.2 earthquake resulted which triggered a small tsunami with a wave height of a few meters.
Monitoring
Mauna Loa is an intensively monitored volcano. The Hawaiian Volcano Observatory (HVO) was established in 1912 to observe the Hawaiian volcanoes, and the HVO has developed many techniques to help predict when eruptions at Mauna Loa and other volcanoes are imminent.
One of the most important tools is seismology. More than 60 seismometers around the Big Island allow scientists to measure the intensities and locations of hundreds of small earthquakes every week. Earthquakes can begin to increase years before an eruption actually starts: the 1975 and 1984 eruptions were both preceded by one to two years of increased seismic activity at depths of less than 13 km.
Another type of seismic activity occurs in the hours preceding an eruption. So-called volcanic tremor is a continuous 'rumble' which contrasts with the normal seismic activity of sudden shocks, and is believed to be caused by the rapid movement of magma underground. Volcanic tremor normally indicates an imminent eruption, although it may also be caused by shallow intrusions of magma which do not reach the surface.
Another important indicator of what is happening underground is the shape of the mountain. Tiltmeters measure very small changes in the profile of the mountain, and sensitive equipment measures distances between points on the mountain. As magma fills the shallow reservoirs below the summit and rift zones, the mountain inflates. A survey line across the caldera measured a 75 mm increase in its width over the year preceding the 1975 eruption, and a similar increase before the 1984 eruption.
Observatories
The elevation and location of Mauna Loa have made it an important location for atmospheric monitoring by the Global Atmosphere Watch, and other scientific observations. The Mauna Loa Solar Observatory (MLSO), located at 3,400 m (11,155 ft) on the northern slope of the mountain, has long been prominent in observations of the Sun. The NOAA Mauna Loa Observatory (MLO), located close by, monitors the global atmosphere at its location well above local influences. Atmospheric carbon dioxide has been measured regularly since 1958 and shows the steadily increasing trend associated with the greenhouse effect and global warming.