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Posts tagged Pacific Ring of Fire

Mount St. Helens in the Cascade Volcanic Arc, USA

May 12th, 2010 Category: Mountains, Volcanoes

USA - April 28th, 2010

USA - April 28th, 2010

Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States, visible just below the center of this orthorectified image.

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.

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.

As with most other volcanoes in the Cascade Range, Mount St. Helens is a large eruptive cone consisting of lava rock interlayered with ash, pumice, and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted. The largest of the dacite domes formed the previous summit, and off its northern flank sat the smaller Goat Rocks dome. Both were destroyed in the 1980 eruption.

Mount Aniakchak in Alaska’s Aleutian Range, USA

56.9N 158.1W

August 30th, 2009 Category: Volcanoes

Alaska, USA - July 28th, 2009

Alaska, USA - July 28th, 2009

Mount Aniakchak is a 3,400 year old volcanic caldera located in the Aleutian Range of Alaska, USA. It has a diameter of about 10 kilometres (6 miles). Within the caldera are several examples of lava flows and cinder cones, as well as a body of water known as Surprise Lake.

The area around the volcano is the Aniakchak National Monument and Preserve, all of which is part of the Pacific Ring of Fire. The caldera itself and the surrounding area can be observed free of geometric distortion as the image has been orthorectified.

Indonesia’s Lesser Sunda Islands

8.5S 116.6E

August 3rd, 2009 Category: Snapshots, Volcanoes

Indonesia - July 2nd, 2009

Indonesia - July 2nd, 2009

From left to right, the largest Indonesian islands visible here are Java, Bali, Lombok, Sumbawa, Sumba and Flores. All except Java are part of the Lesser Sunda Islands, or Nusa Tenggara, group.

The island of Bali, surrounded by coral reefs, lies 3.2 km (2 mi) east of Java. East to west, the island is approximately 153 km (95 mi) wide and spans approximately 112 km (69 mi) north to south; its land area is 5,632 km². The highest point is Mount Agung at 3,142 m (10,308 feet) high, an active volcano.

Lombok, east of Bali, is roughly circular, with a “tail” to the southwest, about 70 km across and a total area of about 4,725 km² (1,825 sq mi).

Sumbawa has an area of 15,448 km² (three times the size of its western neighbor Lombok). It is a volcanic island, lying within the Pacific Ring of Fire, including the volcano Mount Tambor.

Finally, the island of Sumba has an area of 11,153 km². There is a dry season from May to November and a rainy season from December to April.

Volcanic Peaks of the Cascade Range, USA and Canada – July 26th, 2009

43.7N 121.2W

July 26th, 2009 Category: Image of the day, Volcanoes

USA - June 29th, 2009

USA - June 29th, 2009

Two ranges belonging to the large Pacific Coast System are visible in northwestern North America: the Coast Mountains, upper left quadrant, and the Cascade Range, visible as a thin line of white peaks parallel to the green coastal plains.

The Cascade Range, part of the Pacific Ring of Fire, extends from southern British Columbia, Canada, through Washington state and Oregon to Northern California, USA.

It includes both non-volcanic mountains, such as the North Cascades in southern British Columbia and northern Washington, and the notable volcanoes known as the High Cascades in Washington, Oregon and northern California. Both of these divisions are visible here; the volcanic peaks of the High Cascades can be noted as a line of snow-capped summits.

The Coast Mountains, Canada and USA – June 12th, 2009

54.9N 129.9W

June 12th, 2009 Category: Image of the day, Volcanoes

Coast Mountains, Canada and USA - June 2nd, 2009

Coast Mountains, Canada and USA - June 2nd, 2009

The Coast Mountains are a major mountain range of western North America, so-named because of their proximity to the sea coast.

The ranges extends from southwestern Yukon Territory in Canada, through the Alaska Panhandle in the USA and stretches along virtually all of the coast of British Columbia in Canada.

The section visible here is mostly in the province of British Columbia, although the coastal area on the left side is part of Alaska.

The Coast Mountains are approximately 1,600 kilometres (990 mi) long and average 300 kilometres (190 mi) in width. The range is part of the Pacific Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean.

However, the range includes volcanic and non-volcanic mountains, the huge icefields of the Pacific and Boundary Ranges, and the northern end of the notable volcanic system known as the Cascade Volcanoes.

Covered in dense temperate rainforest on its western exposures, visible here as a green band between the snow-capped peaks and the blue waters of the Pacific Ocean, the range rises to heavily glaciated peaks, including the largest temperate-latitude icefields in the world.

The mountains then taper to the dry Interior Plateau on its eastern flanks, or to the subarctic boreal forest of the Skeena Mountains and Stikine Plateau.

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