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Archive for Volcanoes

Volcanoes of La Réunion – December 31st, 2009

20.9S 55.4E

December 31st, 2009 Category: Image of the day, Volcanoes

La Réunion - December 11th, 2009

La Réunion - December 11th, 2009

This orthorectified image portrays the island of La Reunion, which is 63 kilometres (39 mi) long, 45 kilometres (28 mi) wide, and covers 2,512 square kilometres (970 sq mi). It is similar to the island of Hawaii insofar as both are located above hotspots in the Earth’s crust.

On the eastern end of the island, the Piton de la Fournaise shield volcano rises to more than 2,631 metres (8,630 ft) above sea level. It is sometimes considered a sister to Hawaiian volcanoes because of the similarity of climate and volcanic nature. The volcano is very active, having erupted more than 100 times since 1640, and is thus monitored constantly.

Another volcano, the Piton des Neiges is located northwest of the Piton de la Fournaise. It is the highest point on the island at 3,070 metres (10,100 ft) above sea level. Collapsed calderas and canyons can also be observed southwest of the mountain. Unlike its active neighbor, the Piton des Neiges is extinct.

North Island’s Mountain Chain, from Mount Ruapehu to East Cape, New Zealand – December 20th, 2009

38.7S 175.8E

December 20th, 2009 Category: Image of the day, Lakes, Rivers, Volcanoes

New Zealand - November 26th, 2009

New Zealand - November 26th, 2009

The volcanic summit of Mount Ruapehu, lower left quadrant, is covered in snow in this image of New Zealand‘s North Island. The large body of water north of the volcano is Lake Taupo. North Island’s main mountain chain appears as a dark green area running northeast from the volcano and lake towards East Cape, in the upper right quadrant of the full image.

One of the ranges in this mountain chain is the Kaweka Range, located in inland Hawke’s Bay between the city of Napier, 55 kilometres to the southeast, and Lake Taupo, 50 kilometres to the northwest. It is the source of many rivers which flow into Hawke Bay, including among them the Tutaekuri, Mohaka, and Ngaruroro Rivers.

Snow-covered Kamchatka Peninsula, Russia – December 18th, 2009

53.0N 158.6E

December 18th, 2009 Category: Image of the day, Volcanoes

Russia - November 28th, 2009

Russia - November 28th, 2009

Kamchatka Peninsula is a 1,250-kilometer long peninsula in the Russian Far East, with an area of 472,300 km². It lies between the Pacific Ocean to the east and the Sea of Okhotsk to the west. The peninsula contains the Volcanoes of Kamchatka, a UNESCO World Heritage Site.

Here, the Kamchatka or Central Range can be seen running down the middle of the peninsula towards the southern tip, called Cape Lopatka. The circular bay to the north of the cape on the Pacific side is Avacha Bay with the capital, Petropavlovsk-Kamchatsky. Moving north from the cape, up the Pacific side, the four peninsulas are called Shipunsky Point, Kronotsky Point, Kamchatsky Point and Ozernoy Point.

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.

Volcanoes on the Indonesian Island of Java – December 11th, 2009

7.6S 110.7E

December 11th, 2009 Category: Image of the day, Volcanoes

Java, Indonesia - November 9th, 2009

Java, Indonesia - November 9th, 2009

Volcanic peaks tower above the terrain of Java, Indonesia, in this orthorectified image. The view reaches from the north coast to the south coast of the island. Visible on the north shores in the upper right corner is the city of Semarang, while the city of Yogyakarta can be seen near the south coast towards the bottom.

Three volcanoes are situated in a vertical line between the two cities. These are, from north to south, Mount Ungaran, a deeply eroded stratovolcano, Mount Merbabu, a dormant stratovolcano, and Mount Merapi, a conical volcano and the most active in Indonesia.

To the west, near the image center, are the conical peaks of two stratovolcanoes: Mount Sundoro (also spelled Sindoro) , above, and Mount Sumbing, below.