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Posts tagged Diamante Caldera

Simpson Desert, Channel Country and Lake Eyre, Australia – December 8th, 2011

25.4S 138.2E

December 8th, 2011 Category: Deserts, Image of the day, Lakes, Rivers

Australia - November 25th, 2011

The Simpson Desert (upper left quadrant) is a large area of dry, red sandy plain and dunes in Northern Territory, South Australia and Queensland in central Australia. It is the fourth largest Australian desert, with an area of 176,500 kmĀ² (68,100 sq mi).

Visible to the east of the desert is Australia’s Channel Country, a region of outback Australia located mostly in the state of Queensland but also in portions of South Australia, Northern Territory and New South Wales. The name comes from the numerous intertwined rivulets that cross the region. The principal rivers are Georgina River, Cooper Creek and the Diamantina River.

When there is sufficient rainfall in their catchment area these rivers flow into Lake Eyre, South Australia. Lake Eyre is visible at the bottom edge, its southwestern basin appearing green in color and its southeastern basin appearing pinkish, framed by white salt flats.

Volcanoes in Patagonia, Chile

January 31st, 2009 Category: Volcanoes

Patagonia, Chile - January 27th, 2009

Patagonia, Chile - January 27th, 2009

Detail of volcanoes

Detail of volcanoes

Many volcanoes can be seen, capped with snow, in the Andes Mountains in Chilean Patagonia.

While the main image shows a general view of the area, from the Pacific Ocean, across Chile and the Andes, into Argentina, the first image detail contains a close-up look at the many volcanoes and lakes.

The second close-up focuses on Maipo, a stratovolcano north of Patagonia lying on the border between Argentina and Chile. It is located about 100 km (60 miles) southeast of Santiago.

Maipo retains a symmetrical, conical volcanic shape, unlike many of the other nearby peaks. Some smoke is visible blowing westward from near the volcano, though it is unclear if it is being vented from Maipo itself or caused by forest fires in the area.

Close-up of smoke and Maipo volcano

Close-up of smoke and Maipo volcano

The grey area surrounding the volcano is the Diamante Caldera, a feature of about 15 km by 20 km size. On the eastern side of the caldera floor, is the Laguna del Diamante, a lake that formed when lava flows blocked drainage channels from the caldera in 1826.