Most Active Volcanos in the USA

Alaska
Augustine Volcano
Augustine volcano is one of the most active volcanoes in Cook Inlet, having a symmetrical cone rising 1,254 meters above the sea level. This volcano has erupted in 1812, 1883, 1935, 1963-64, 1976 and 1986, and surprisingly, the intervals between these eruptions have reduced from 70 to 10 years. It's summit comprises of several overlapping lava dome complexes formed during historic and prehistoric eruptions. Nearly 12 landslides took place at Augustine and the most recent slide that occurred was at the onset of the 1883 eruption, when a part of the volcano's summit collapsed into the sea. Within an hour, a tsunami nearly 9 meters high crashed ashore on the coast of the Kenai Peninsula, which was 80 kilometers away. As it was low tide, there was no loss of life, only minor property damage was reported.
 
     

    
California
Lassen Peak

Lassen Peak is the southernmost active volcano in the Cascade Range. It is part of the Cascade Volcanic Arc which is an arc that stretches from northern California to southwestern British Columbia. Located in the Shasta Cascade region of Northern California, Lassen rises 2,000 feet above the surrounding terrain and has a volume of half a cubic mile, making it one of the largest lava domes on Earth. It was created on the destroyed northeastern flank of now gone Mount Tehama, a stratovolcano that was at least 1,000 feet (300 m) higher than Lassen.



Lassen Peak has the distinction of being the only volcano in the Cascades other than Mount St. Helens to erupt during the 20th century. On May 22, 1915, an explosive eruption at Lassen Peak devastated nearby areas and rained volcanic ash as far away as 200 miles to the east. This explosion was the most powerful in a 1914–17 series of eruptions that were the last to occur in the Cascades before the 1980 eruption of Mount St. Helens in Washington. Lassen Volcanic National Park was created in Shasta County, California to preserve the devastated area and nearby volcanic geothermal features.

Mount Shasta
Diller Canyon on Shastina near Weed, CaliforniaDuring the last 10,000 years Shasta has erupted an average of every 800 years but in the past 4,500 years the volcano has erupted an average of every 600 years. The last significant eruption on Shasta may have occurred 200 years ago, as noted above.

Mount Shasta can release volcanic ash, pyroclastic flows or dacite and andesite lava. Its deposits can be detected under nearby small towns totaling 20,000 in population. Shasta has an explosive, eruptive history. There are fumaroles on the mountain, which show that Shasta is still alive.

The worst case scenario for an eruption is a large pyroclastic flow, such as what occurred in the 1980 eruption of Mount St. Helens. Since there is ice, such as Whitney Glacier and Mud Creek Glacier, lahars would also result. Ash would probably blow inland, perhaps as far as eastern Nevada. There is a small chance that an eruption could also be bigger resulting in a collapse of the mountain, as happened when Mount Mazama in Oregon collapsed to form what is now called Crater Lake, but this is of much lower probability.

Hawaii
Mauna Lo
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Being one of the world's largest active volcanoes, Mauna Loa rises more than 9,000 meters from the seafloor, and is considered to be taller than Mount Everest. Since 1900, it has erupted 15 times, with eruptions lasting from less than a day to nearly 145 days. The most recent eruption of Maura Loa was on March 25, 1984, that continued for 3 weeks. As a result, the lava flows were only 6.5 kms away from buildings in the city of Hilo. It erupts less frequently than Kilauea, but produces a larger quantity of lava in a shorter period of time.

Kilauea Volcano
Kilauea is the youngest volcano in the Hawaiian Islands. It's longest rift-zone eruption began on January 3, 1983 when a row of lava fountains broke out from its east rift zone, about 17 kms from the summit caldera. The volcano was named Kilauea which means 'spewing' or 'much spreading'; in reference to the lava flows when it erupts. The lava eruption from the Kilauea volcano has covered approximately 75 square kilometers of forest and grassland, destructed 179 homes, and added 120 hectares of new land to the island. Of all the eruptions at Kilauea, a few historical eruptions were dangerously explosive, as fast-moving mixtures of ash and gas, called pyroclastic surges, killed many people.

Oregon
Mount Hood
Mount Hood, called Wy'east by the Multnomah tribe, is a stratovolcano in the Cascade Volcanic Arc of northern Oregon. It was formed by a subduction zone and rests in the Pacific Northwest region of the United States. It is located about 50 miles east-southeast of Portland, on the border between Clackamas and Hood River counties.

The exact height assigned to Mount Hood's snow-covered peak has varied over its history. Modern sources point to three different heights: 11,249 feet based on the 1991 U.S. National Geodetic Survey 11,240 feet based on a 1993 scientific expedition and 11,239 feet of slightly older origin. The peak is home to twelve glaciers.[8] It is the highest mountain in Oregon and the fourth-highest in the Cascade Range. Mount Hood is considered the Oregon volcano most likely to erupt, though based on its history, an explosive eruption is unlikely. Still, the odds of an eruption in the next 30 years are estimated at between 3 and 7 percent, so the USGS characterizes it as "potentially active", but the mountain is informally considered dormant.

Mount Jefferson
Mount Jefferson is a stratovolcano in the Cascade Volcanic Arc, part of the Cascade Range, and is the second highest mountain in Oregon. Situated in the far northeastern corner of Linn County on the Jefferson County line, about 105 miles east of Corvallis, Mount Jefferson is in a rugged wilderness and is thus one of the hardest volcanoes to reach in the Cascades; though USFS Road 1044 does come within 4 miles of the summit. The lower reaches of the mountain's north side also extend into southeastern Marion County, although its summit does not. Many people consider Jefferson's craggy, deeply glacially scarred appearance to be especially beautiful and photogenic


Washington
Mount Rainier

Mount Rainier is the largest volcano in the Cascade Range and is located in Washington state. Reaching a height of 4,392 m (14,410 ft), this dangerous volcano is situated near the large urban areas of Tacoma and Seattle. The main danger from an eruption of Mount Rainier would be the creation of landslides or mudflows of volcanic debris that resemble wet concrete. This would result in melting of the glaciers capping the mountain, causing floods that would mix with loose volcanic ash and rock debris, destroying everything in its path.

The United States is well known for its active volcanoes that have the potential to wreak havoc on their immediate surroundings by releasing ash and toxic gases and causing mudslides. Nearly 80% of the US active volcanoes are in the Aleutian Islands and about 75% of the world’s volcanic eruptions occur along the Pacific Ring of Fire.

Mount St. Helens
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles south of Seattle and 50 miles northeast of Portland, Oregon. Mount St. Helens takes its English name from the British diplomat Lord St Helens, a friend of explorer George Vancouver who made a survey of the area in the late 18th century. The volcano is located in the Cascade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.

Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980, at 8:32 am PDT. which was the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles of railways, and 185 miles of highway were destroyed. The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from 9,677 feet to 8,365 feet and replacing it with a 1 mile wide horseshoe-shaped crater.[3] The debris avalanche was up to 0.7 cubic miles in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for its aftermath to be scientifically studied.

Mount Baker
Mount Baker is an active glaciated andesitic stratovolcano in the Cascade Volcanic Arc and the North Cascades of Washington State in the United States. It is the second-most active volcano in the range after Mount Saint Helens. It is about 31 miles due east of the city of Bellingham, Whatcom County, making it the northernmost volcano in the Cascade Range but not the northernmost of the Cascade Volcanic Arc, which extends north into the Coast Mountains. Mount Baker is the youngest volcano in the Mount Baker volcanic field. While volcanism has persisted here for some 1.5 million years, the current glaciated cone is likely no more than 140,000 years old, and possibly no older than 80-90,000 years. Older volcanic edifices have mostly eroded away due to glaciation.
 

This listing of the Top Ten most active volcanos in the United States is constantly being revised as dormat volanos become active. So, if you feel we are missing one, please email us and let us know!