Photo of the Day

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26
Etna mountain guide Andrea Ercolani with his group arrives on the scene when a lava flow emerges from the fissure. (Photo: Tom Pfeiffer)
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27
Batok, Bromo and Semeru (c)
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28
Our kitchen at the camp just 10 meters below the rim of the crater... (Photo: Tom Pfeiffer)
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29
A starting lava fountain in the middel of the lake at night, creating a triple junction of rifts in the crust. (Photo: Tom Pfeiffer)
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30
Jorge inspecting the damage to the knocked-down tree. Interestingly, it was not burnt, showing that the block hitting it was not very hot. (Photo: Tom Pfeiffer)
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31
Strombolian eruption from the 2900 m vent near Etna's SE crater (July 2001 flank eruption). (Photo: Tom Pfeiffer)
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1 Nov
Monoclinic sulphur needles stable only at high temperatures and little acid drops. (crop from next image) (c)
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2
The dark ash and the blue SO2 gas plumes drifting east, but the crater itself continues to hide. (Photo: Tom Pfeiffer)
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3
Peter, our Maassai guide, in front of the remaining of hornito T49b, miraculously still standing next to the collapse pit. (Photo: Tom Pfeiffer)
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4
Volcanologist Alexei Ozerov from the Institute also has joined us and is giving a lecture about Kamchatka's volcanoes and eruption dynamics during tea time. (Photo: Tom Pfeiffer)
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5
Antigua by night (Photo: Tom Pfeiffer)
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6
6 Sep: nevertheless, we had a fantastic time in this unique and remote place. Group photo. (Photo: Tom Pfeiffer)
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7
Lightnings behind the western (left) Kimanura cone. (Photo: Tom Pfeiffer)
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8
Very large blocks were ejected and roll down the slopes along with fingers of ash. (Photo: Tom Pfeiffer)
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9
View towards the older Fossa I rim (Photo: Tom Pfeiffer)
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10
The bunker by Merapi (Photo: Ivana Dorn)
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11
The steep walls of the huge Tengger caldera (Photo: Tom Pfeiffer)
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12
Hard salt structures (Photo: Tom Pfeiffer)
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13
The lava lake inside the south crater (Photo: Tom Pfeiffer)
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14
The lava flow in the afternoon. (Photo: Emanuela / VolcanoDiscovery Italia)
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15
A lava fall over the sea cliff at Kilauea volcano (Photo: Tom Pfeiffer)
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16
Powerful, 400 m high eruption from the central vent of Stromboli volcano (Photo: Tom Pfeiffer)
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17
Even in the Danakil, one can find water deep under the sand. We are grateful for this opportunity to take showers. (Photo: Tom Pfeiffer)
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18
To get to the rim of Marum, we first have to circle it and descend a bit again, following a ridge in a moon-like landscape of ash, erosion gullies and (fortunately not recent) volcanic blocks and bombs.  (Photo: Tom Pfeiffer)
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19
An exploding bubble of gas disrupts the crust of the lava lake. (Photo: Tom Pfeiffer)
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20
Ash and steam plume from Iceland's Eyjafjallajökull volcano eruption in April 2010 (Photo: Jorge Santos)
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21
Powerful explosion of a liquid lava bubble from the outward-facing vent of the NE crater cone. (Photo: Tom Pfeiffer)
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22
Ash-rich vulcanian-type explosions producing tall ash plumes, were often accompanied by loud bangs. Such powerful explosions seemed to occur in sets of 5-10 events, usually spaced 3-5 minutes, approximately every 6-10 hrs during our observation time from 4-8 June 09.  (Photo: Tom Pfeiffer)
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23
9 June 2017 night: a stronger explosion occurs from the N2 crater, the most active of a total of 6 vents during most of the recent times. (Photo: Tom Pfeiffer)
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24
Since the more active 2010 period where there were also green acid ponds at Dallol, the area had slowly become smaller and most of the green acids pond disappeared. This was probably linked to the unusual 4 years of no direct rain in the area. The much needed rainshowers at the end of 2015- start of 2016 brought back the green acid ponds and since then the colourful active Dallol hydrothermal fields have grown significantly. (Photo: Hans and Jooske)
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25
Sulfur on Vulcano (Photo: Tom Pfeiffer)
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26
Anak Krakatau Nov. 2018 (Photo: Axel Timm)
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27
View from high above Colima's summit with Nevado in the background. (Photo: Ingrid Smet)
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28
River erosion has carved out an open cave, about 5 meters tall and 4 meters wide at the side of the river bed, providing a natural shady shelter from the summer heat. (Photo: Tom Pfeiffer)
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29
View of the southeastern crater part of Bocca Nuova (Photo: Tom Pfeiffer)
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30
Cat streching its legs ("Pudauku") (Photo: Tom Pfeiffer)
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1 Dec
Volcanologists observing the new activity (Photo: Tom Pfeiffer)
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2
Only 100 m above sea level. A ghostly, tornado-like dust devil greets us on our way through fault-cut lava deserts into the Danakil depression. (Photo: Tom Pfeiffer)
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3
Green salt ponds at Dallol (Photo: Tom Pfeiffer)
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4
Daisies and the caldera near Akrotiri (Photo: Tom Pfeiffer)
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5
Fracturing crust in the triangle between three larger pieces of crust. (Photo: Tom Pfeiffer)
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6
The active vent feeding the lava lake in Pu'u 'O'o crater on 14 July 2007. (Photo: Tom Pfeiffer)
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