सुमेरो ज्वालामुखी से आज फिर भारी लहर, धुआं-धूल उड़ने से दृश्यता घटे

Another lahar today from Mount Semeru. As you can see in the video, it can look like cement or carry huge boulders. It also kicks up ash which can cause breathing difficulties and poor visibility. A lahar is a fast-moving debris- and water-filled flow (volcanic material) that travels down the slopes of a volcano - essentially a “volcanic mudflow.” The timing can vary widely - from days to weeks, even months or years after the eruption - depending on how quickly rain or other water sources remobilize the loose material.