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Mauna Kea Volcano, Hawaii, USA – December 16th, 2008

December 16th, 2008 Category: Image of the day, Volcanoes

Hawaii, USA - December 10th, 2008

Hawaii, USA - December 10th, 2008

Two of the Hawaiian Islands, Maui (left) and Hawaii (right) can be seen here.

Hawaii is a state in the United States, located on an archipelago in the central Pacific Ocean southwest of the continental United States, southeast of Japan, and northeast of Australia.

This state encompasses nearly the entire volcanic Hawaiian Island chain, which is made up of hundreds of islands spread over 1,500 miles (2,400 km).

Mauna Kea, identifiable as a dark brown circular area towards the northern coast Hawaii, is a dormant volcano. Pu’u Wekiu, one of numerous cinder cones on the summit plateau, is the highest point in the state of Hawaii at 13796 ft.

Mauna Kea is the tallest mountain in the world when measured from base to summit, since its base is located on the seafloor about 19000 ft beneath the surface of the Pacific Ocean, bringing its total height to about 33000 ft.

source Wikipedia

Mount Teide Volcano on Tenerife, Canary Islands – January 20th, 2012

28.2N 16.6W

January 20th, 2012 Category: Image of the day, Volcanoes

Tenerife - January 9th, 2012

This orthorectified image shows Tenerife, the largest and most populous island of the seven Canary Islands. It is a rugged and volcanic island sculpted by successive eruptions throughout its history. Tenerife is the largest island of the Canary Islands archipelago, with a surface area of 2,034.38 km2 (785 sq mi) and the longest coastline amounting to 342 km (213 mi).

In addition, the highest point, the volcano Mount Teide, with an elevation of 3,718 m (12,198 ft) above sea level is the highest point in all of Spain. It is the third highest volcano in the world measured from its base on the ocean floor, after Mauna Loa and Mauna Kea located in Hawaii.

Five Volcanoes of Hawaii’s Big Island

21.1N 157.2W

February 16th, 2010 Category: Volcanoes

USA - January 25th, 2010

USA - January 25th, 2010

The Island of Hawaii, also known as the “Big Island” in order to distinguish it from the state, is built from five separate shield volcanoes that erupted somewhat sequentially, one overlapping the other.

These are (from oldest to youngest): Kohala (extinct), Mauna Kea (dormant), Hualālai (active but not currently erupting), Mauna Loa (active), and Kīlauea (active: an eruption began in 1983 and as of 2010 has grown in size).

All five can be observed upon opening the full version of this orthorectified image: (clockwise from top) Kohala, Mauna Kea, Kilauea and Hualalai, with Mauna Loa in the center.

Because Mauna Loa and Kīlauea are active volcanoes, the “Big Island” of Hawaiʻi is still growing bigger. Between January 1983 and September 2002, lava flows added 543 acres (220 ha) to the island.

Hualālai and Mauna Loa Volcanoes, Hawaii USA

19.6N 155.8W

August 10th, 2009 Category: Volcanoes

Hawaii, USA - July 11th, 2009

Hawaii, USA - July 11th, 2009

The Island of Hawaii is built from five separate shield volcanoes that erupted somewhat sequentially, one overlapping the other. From oldest to youngest these are: Kohala, Mauna Kea, Hualālai, Mauna Loa and Kīlauea.

Two of these can be observed in this orthorectified image: Mauna Loa, the prominent volcano visible towards the center of the island, and Hualālai, near the top by the island’s coast.

Hualālai is a dormant shield volcano on the island of Hawaiʻi in the Hawaiian Islands. Its peak is 8,271 ft (2,521 m) above sea level. It lies roughly due west of the saddle between the much higher volcanoes Mauna Kea and Mauna Loa.

Much of the southern slope (above the town of Kailua-Kona) consists of lava flows covered by a layer of volcanic ash from 10 cm (a few inches) to a meter (3 ft) thick.

Hualālai is built from a well-defined rift zone that trends approximately N50°W across its summit and a less well-defined rift zone that trends northward from a point 3 mi east of the summit. Over 100 cinder and spatter cones are arranged along the rift zones. There is no summit caldera, just a collapse crater (about 0.3 mile across) at the top of a small lava shield.

Comparative Look at Hawaiian Volcanoes – February 16th, 2009

February 16th, 2009 Category: Image of the day, Volcanoes

Hawaii, USA - January 27th and February 9th, 2009

Hawaii, USA - January 27th and February 9th, 2009

These side-by-side MERIS (full resolution, left) and ASAR (radar, right) images make it possible to have a detailed, complete look at these Hawaiian volcanoes.

Mauna Loa, the large shield volcano below, and Mauna Kea, the tall post-shield volcano above, are two of the five volcanoes that form the island of Hawaii in the Pacific Ocean.

The color image makes it possible to observe the differences in landscape around the volcanoes. The summits of both volcanoes are capped with snow, and the area around them is dark brown, probably due to volcanic rock.

At low elevations, the eastern (windward) side of Mauna Loa often receives heavy rain and is in fact cloud-covered in the image. The rainfall supports extensive forestation, visible as bright green areas beneath the clouds. The western (leeward) side has a much drier climate and appears more brown.

Although the black and white image doesn’t make it possible to see changes in vegetation, it does allow a more precise view of the contours of the volcanoes and their calderas. Some towns are also visible as white dots on the volcanoes’ flanks.