The lava lake seen from above (Photo: Tom Pfeiffer)
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The typical activity of the lava lake with a stable fountain on its western rim. (Photo: Tom Pfeiffe...
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The sun is just about to rise above the horizon. The lava lake is mostly crusted over and the dry we...
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The morning sun illuminates the caldera walls orange. (Photo: Tom Pfeiffer)
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Observers on the crater rim, illuminated by the glow of the lava lake in the evening. (Photo: Tom Pf...
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Vertical view onto the lava lake in the evening showing a typical scene of activity: 3 areas at the ...
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The surface of the lava lake in the evening, when the rift zones are starting to glow red, revealing...
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View over the active lava lake (Photo: Tom Pfeiffer)
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Evening view onto the south crater; some observers are small dots on the crater rim. (Photo: Tom Pfe...
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The illuminated crater walls in the evening (Photo: Tom Pfeiffer)
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As it grows darker, the glow becomes more impressive and our groups starts to gather for countless h...
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Violent fountaining starts from the northern margin of the lava lake at sunset. (Photo: Steve Hunt)
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Strong fountaining from the northern margin of the lake makes a great firework, throwing spatter hig...
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The fountaining looks like strombolian activity! (Photo: Tom Pfeiffer)
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A night-time fountain on the western shore of the lake (Photo: Steve Hunt)
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Most of us gather on the western rim, to enjoy the spectacular fountaining at night. (Photo: Tom Pfe...
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The group on the rim of the crater, whose walls are illuminated bright yellow and orange by the foun...
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Night-time patterns on the surface of the lava lake. (Photo: Tom Pfeiffer)
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Jorge and Steve taking pictures at night (Photo: Tom Pfeiffer)
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The glow from the lava lake in the morning twilight (Photo: Tom Pfeiffer)
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Folds created by "tectonic" movements of the relatively thick, but still plastically deforming crust...
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After an extended period of stable crust and relative inactivity, the now heavy crust starts to over...
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Sulphur covers part of the walls of a small, deep pit crater in the caldera, near the north crater (...
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Abstract patterns on the surface of the lava lake (Photo: Tom Pfeiffer)
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Fresh lava is sloshing out of the fountain onto the lava lake's crust, where a small crack is wideni...
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Close-up onto the lava sloshing out from the fountain at the lake shore (Photo: Tom Pfeiffer)
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Sloshing lava onto the crust of the lava lake (Photo: Tom Pfeiffer)
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Spattering from the (hidden) fountain and the illuminated inner crater walls (Photo: Tom Pfeiffer)
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Fountaining illuminates the crater walls. Some observers are gathered on the left rim of the lake. (...
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Jorge on the western rim right above the lava lake (Photo: Tom Pfeiffer)
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Exploding lava bubble at the fountain at the margin of the lake (Photo: Tom Pfeiffer)
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A widening crack in the lava lake's crust is developing into a rift. (Photo: Tom Pfeiffer)
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The lava lake is sometimes effectively "tapped" for more than an hour at a time - covered with a sta...
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A circular fountain starts to develop at the margins of the lake, after a period where the lake was ...
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The solid crust is breaking up starting from its margins where degassing has resumed in a violent fo...
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The lava fountain at the margin of the lake. (Photo: Tom Pfeiffer)
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The opening of the crust along its margins is progressing and creates new fountains. (Photo: Tom Pfe...
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The view from the north onto the lava lake inside its pit crater, about 50 meter wide, in the south ...
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A collision zone between two plates of the lava lake's crust where one plate is thrusted over the ot...
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The walls of the lake are composed of many pahoehoe flows from repeated overflows. (Photo: Tom Pfei...
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Exploding lava bubble on the axis of a rift zone. (Photo: Tom Pfeiffer)
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Detail of a rift zone on the lake's crust (Photo: Tom Pfeiffer)
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The floor of the caldera consists of pahoehoe lava flows, most of them originating from eruptions ca...
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The group and our camp above the south crater. (Photo: Tom Pfeiffer)
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Sunset touches the upper caldera rims of the Erta Ale volcano. Behind is another caldera and Hayli G...
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The shadow of a spatter cone near the southern pit crater and the illuminated eastern caldera wall. ...
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The south crater which contains the active lava lake inside the caldera of Erta Ale volcano at sunse...
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