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Vegetation Around Mauna Loa Volcano on Hawaii, USA – January 4th, 2011

21.1N 157.2W

January 4th, 2011 Category: Image of the day, Volcanoes

USA - December 26th, 2010

The island of Hawaii occupies virtually all of this thumbnail image, while several other of the Hawaiian Islands can be observed in the full version.

The island shows terrain of mixed colors, mainly shades of green and brown. The green areas indicate forests and vegetation, while the brown areas are volcanic. The dark brown area in the center of the island is the Mauna Loa volcano. The darkest brown areas are mostly lava flows on the volcano’s relatively shallow slopes.

Mauna Loa Volcano and Ka Lae, Hawaii – February 4th, 2010

21.1N 157.2W

February 4th, 2010 Category: Image of the day, Volcanoes

USA - December 20th, 2009

USA - December 20th, 2009

The full version of this orthorectified image stretches from the northernmost point of the island of Hawaii, across the volcano of Mauna Loa, to Ka Lae (or South Point), the southernmost point on the island.

As one may suppose from the area occupied by the volcano in the full image, it is the largest volcano on earth. This active shield volcano has a volume of about 18,000 cubic miles (75,000 km³), although it is not the highest peak on the island.

Ka Lae, also known as South Point, is the southernmost point on the Big Island of Hawaii as well as the southernmost point of the 50 United States. A confluence of ocean currents just offshore makes this spot one of Hawaii’s most popular fishing spots, although dangerous for swimming. The confluence of currents also means the area is prone to accumulation of marine debris.

Volcanoes of Hawaii: Mauna Kea, Mauna Loa and Hualālai – December 14th, 2009

19.8N 155.6W

December 14th, 2009 Category: Image of the day, Volcanoes

USA - December 1st, 2009

USA - December 1st, 2009

The island of Hawaii is home to five volcanoes, three of which can be observed here in this orthorectified image. These are, clockwise from the upper right, Mauna Kea, Mauna Loa and Hualālai.

Mauna Kea is a dormant volcano in the post-shield stage of volcanic evolution. Its peak is 13,803 feet (4,207 m) above sea level but 33,476 feet (10,203 m) above its base on the floor of the Pacific Ocean, making it the world’s tallest mountain by this measure. The rounded formations on its flanks are various cinder cones.

Mauna Loa is an active shield volcano, with a volume estimated at approximately 18,000 cubic miles (75,000 km³). Its peak, with an elevation of 13,679 feet (4,169 m), is about 120 feet lower than that of Mauna Kea.

Hualālai is a dormant shield volcano with a peak at 8,271 feet (2,521 m) above sea level, much lower than those of Mauna Kea and Mauna Loa. Although Hualālai is not nearly as active as nearby Mauna Loa, geologic mapping of the volcano shows that 80 percent of Hualālai’s surface is covered by lava flows no older than about 5,000 years.

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.

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.