Boris Behncke
Glowing rivulets of lava run down Mount Etna's flanks as dawn begins to break.
OurAmazingPlanet
updated 5/1/2012 1:44:43 PM ET 2012-05-01T17:44:43

Italy's Mount Etna and Mexico's Popocatepetl volcano have been huffing and puffing their way into the news recently, spewing plumes of ash and dribbling lava in the latest flare-ups of eruptive activity that have been going on for years in the case of both volcanoes.

While larger eruptions, such as the the Philippines' Pinatubo in 1991 and the 1980 blast of Mount St. Helens in Washington, are more famous for the disruptions they caused, some near-constant eruptions have their own associated hazard, posing threats to nearby communities and potential disruptions to air traffic from ash plumes.

Here are five volcanoes that don't always get a lot of fanfare, but have been quietly (or maybe not so quietly) rumbling and spitting up volcanic material continuously for years — even decades — in order of the number of years they've been erupting.

5. Sangay in Ecuador — 94 years
The modern volcano structure, which reaches a height of 17,158 feet (5,230 meters), dates back about 14,000 years and was built within horseshoe-shaped calderas, or volcanic depressions, of two previous edifices that collapsed and caused avalanches. The earliest report of a historical eruption here was in 1628; then more or less continuous eruptions were reported from 1728 until 1916. The volcano started up again in 1934 and hasn't stopped since.

4. Santa Maria, Guatemala — 101 years
Santa Maria is a 12,375-foot-tall (3,772-meter) stratovolcano that towers over Guatemala's Pacific coastal plain. It erupted catastrophically in 1902, one of the largest eruptions of the 20th century, causing severe damage throughout southwestern Guatemala and carving a crater on the volcano's flank. A lava-dome complex, called Santiaguito, has been forming in the crater since 1922.

3. Stromboli, Italy — 108 years
Stromboli is the tip of a massive underwater volcano that has been erupting nearly continuously for more than 2,000 years. The explosive style of eruption displayed by it and other volcanoes is known as "Strombolian." A 2002 eruption caused a small tsunami and damaged a village on the island, which lies off the coasts of Italy and Sicily.

2. Mount Etna, Italy — 109 years
Dating back to 1500 B.C., the volcano has erupted about 200 times. The mountain is currently around 10,958 feet (3,340 meters) high and is the largest active volcano in Europe. The most violent eruption in the history of Mount Etna occurred in March 1669. The volcano spewed molten rock for days on end; the eruption finally stopped at the end of April that year.

1. Mount Yasur, Vanautu — 111 years
This stratovolcano is part of the archipelago nation of Vanuatu in the South Pacific. Yasur has been erupting nearly continuously for over a century, and its eruptions, which often occur several times an hour, are classified as Strombolian or Vulcanian (a relatively low-level type of eruption).

© 2012 OurAmazingPlanet. All rights reserved. More from OurAmazingPlanet.

Explainer: Eight dangerous volcanoes around the world

  • Carlos Gutierre  /  Reuters file

    After 9,000 years of dormancy, the Chaiten volcano in southern Chile awoke in 2008 and began a series of eruptions that spewed ash miles into the sky, as shown in this image. The volcano's namesake town of 4,500, just 6 miles from the spewing crater, was devastated by falling ash and floods. The eruption claimed at least one life and serves as a stark reminder that slumbering volcanoes pose grave dangers. Click on the "Next" label to learn about seven more dangerous volcanoes around the world.

  • Is Mount Vesuvius the most dangerous?

    Courtesy of Digital Globe

    Italy's Mount Vesuvius is most famous for the A.D. 79 eruption that buried the cities of Pompeii and Herculaneum. Despite the dark history, millions of people today live near the volcano. The thriving mass of humanity in such close proximity to the volcano makes Vesuvius a serious contender for the world's most dangerous volcano. Scientists fear that a catastrophic eruption could hurl scalding gas-rich magma, water vapor and debris at the masses with insufficient warning time for an evacuation.

  • In Mexico, they wonder when 'Popo' will blow

    Joel Merino  /  AP file

    Mexico City, a metropolis of 18 million people, sits 40 miles to the east of Popocatepetl, the second tallest volcano in North America. Puebla, a town of 2 million, lies 30 miles to the west. A major eruption, scientists say, could choke the skies with ash and send massive mudslides into the crowded valleys below. The result could prove catastrophic. The volcano has been relatively quiet since a bout of activity between 1920 and 1922, though it rumbled back to life in 2000, as shown in this image, prompting evacuation orders and worries that "Popo" is ready to blow.

  • Will spirits warn when Merapi is ready to go?

    Afp  /  AFP/Getty Images

    Merapi in Indonesia is one of the world's most active volcanoes, regularly spewing hot gas and ash miles into the sky, and sending mud and fragmented rocks down the sides. In 1994, 60 people were killed by a searing gas cloud, and about 1,300 people died when it erupted in 1930. During a bout of eruptions in 2006, many villagers, including the woman in this picture, refused orders to evacuate. They believe the spirits will warn when a catastrophic eruption is imminent.

  • Nyirangongo threatens with fast moving lava

    Image: Aerial view of Nyirangongo
    NASA file

    Lava flows, while hot, are rarely deadly: They usually ooze slow enough that people can easily outrun them. That's not the case with the lava that flows from Nyirangongo in Africa's Democratic Republic of Congo. It has very low levels of silica, the mineral that thickens and slows lavas. In 2002, Nyirangongo's lava suddenly gushed at speeds up to 60 mph into the town of Goma, which is home to half a million people. Scientists fear that lava pooling in the crater could suddenly drain again and cause even more devastation.

  • Will disaster of Nevada del Ruiz be repeated?

    R. J. Janda  /  USGS

    After nearly a year of minor earthquakes and eruptions, Colombia's Nevada del Ruiz volcano exploded on Nov. 13, 1985. Pyroclastic flows melted the summit's snowcap. Mudflows, called lahars, raced down the mountainside. One mudflow wiped out the village of Chinchina and killed 1,927 people, according to reports. A second followed the same path as earlier lahars and swept away the town of Armero, shown in this image. An estimated 23,000 people died, making it Colombia's worst natural disaster. Scientists said an early warning system could have averted the loss of life. Now that one is in place, will it work when the volcano wakes again?

  • Is majestic Mount Fuji overdue for an eruption?

    Shizuo Kambayashi  /  AP file

    The islands of Japan harbor more than 100 volcanoes, and a handful or so erupt every year. The majestic Mount Fuji, shown here, has not erupted since 1707, but a swarm of low-frequency earthquakes in 2000 and 2001 raised the specter that the mountain was awakening from its 300-year slumber. Though Fuji has since quieted down, the risk to Tokyo, a city of 30 million people just 70 miles to the east, is very real, scientists say. A 2004 government study put the price tag of a worst-case eruption at more than $20 billion.

  • Mount Rainier, an attractive danger

    Lyn Topinka / USGS

    Washington's 14,410-foot-tall Mount Rainier, shown in this image, is a big attraction for many people in the Pacific Northwest. It is also a big threat, according to scientists. An estimated 3 million people live in its shadow — at least 100,000 on top of old mudflows from previous eruptions. The flows, known as lahars, are the greatest risk. Though commonly associated with major eruptions that strike with ample warning, an earthquake or small burp of rock, ash and gas could also trigger a lahar, giving residents in the path only 10 to 15 minutes to escape.

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