| Heavy rainfall over the tropical island further generated cold lahars, which are a horrific slurry mix of pyroclastic material, rock, and water. |
|
| Major valleys cutting the volcano's flanks have been partly or completely filled in by pyroclastic flow deposits and lahars. |
|
| Some volcanic eruptions generate dangerous lahars that travel far beyond the volcano. |
|
| Continued growth increases the risk of partial dome collapse, which could trigger moderate explosions and possibly significant lahars from the crater. |
|
| Two bridges connect the town to the other side. The residents have only minutes to get across those bridges to escape potential lava flows, lahars, and mudslides. |
|
| Eruption creates lahars that bury most of town of Armero and devastate Chinchiná. |
|
| This lets them hear lahars from a long way off, creating a valuable extra hour of time that can be used to evacuate. |
|
| Mudflows, or lahars, are common hazards associated with stratovolcanoes and can happen even without an eruption. |
|
| Subsequent lahars deposit ash and debris, causing roof collapses and at least 300 deaths. |
|
| With hindsight, it transpires that there was little risk of lahars during the escalation phases of the eruption. |
|
| Unconsolidated deposits of ash may eventually mix with water to become massive, quick-moving mudflows, called lahars, that can fill in small valleys. |
|
| Eruption causes the crater lake, boiling from volcanic activity, to break through side of mountain, causing lahars and destroying 104 villages and part of city of Blitar. |
|
| Pyroclastic flows may also interact with snow and ice to generate lahars. |
|
| Melting of remnant glacial ice capping the Mount Garibaldi area could produce floods, lahars, or debris flows that might endanger small communities including Brackendale. |
|
| They are most common and voluminous as a result of explosive eruptions on snow-clad volcanoes, because pyroclastic flows can instantaneously melt ice and slow, creating large-volume lahars. |
|
| Other volcanic lakes are created when either rivers or streams are dammed by lava flows or volcanic lahars. |
|
| Some scientists have speculated that the lahars could be worse next time because they can flow through fresh, clean pathways. |
|
| At around 8pm, Mt Ruapehu erupted, spilling lahars down two sides of the mountain. |
|
| In March 2009, Redoubt erupted, sending mud flows known as lahars down the Drift River. |
|
| The water could trigger devastating mud slides, called lahars. |
|
|
|
| When Mount Manaro stirred, the void created by a lack of community knowledge of past deadly eruptions or lahars in 1870 and 1914 left the islanders with no choice but to improvise. |
|
| Vanuatu volcanologists released a bulletin on 29 November confirming that an eruption was in progress and that, since explosions were rising through the water-filled crater known as Lake Vui, there was a risk of lahars. |
|
| At this stop we observe some of the main features of the 13 November, 1985, VNR eruption, when lahars initiated at the headwaters of the Guali River. |
|
| Volcanologists around the world have paid more heed to the danger of lahars since 1985, when a moderate eruption in Colombia triggered a mudflow that claimed 25,000 lives. |
|
| The rock mixed with and melted snow and ice that had been carried from the peak, creating debris flows called lahars with the consistency of wet cement. |
|
| Lahars act like concrete, flowing when carried by water but becoming solid when deposited on land. |
|
