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The ash and tephra are ejected at speeds of several hundred metres per second, and can rise rapidly to heights of several kilometres, lifted by enormous convection currents. Eruption columns may be transient, if formed by a discrete explosion, or sustained, if produced by a continuous eruption or closely spaced discrete explosions.
Peru's government declared a 60-day state of emergency for several southern towns on Wednesday as the country's most active volcano spews ash and gas. Ash from the Ubinas volcano in the Moquegua ...
Indonesia has evacuated about 6,500 people on the island of Flores after Mount Lewotobi Laki-laki volcano spewed thick clouds of brownish ash for the past days, authorities said on Monday. The ...
Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 2018. A pyroclastic flow (also known as a pyroclastic density current or a pyroclastic cloud) [1] is a fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano at average speeds of 100 km/h (30 m/s; 60 mph) but is capable of reaching speeds up to ...
Volcanic lightning is an electrical discharge caused by a volcanic eruption rather than from an ordinary thunderstorm.Volcanic lightning arises from colliding, fragmenting particles of volcanic ash (and sometimes ice), [1] [2] which generate static electricity within the volcanic plume, [3] leading to the name dirty thunderstorm.
A remote volcano in Alaska’s Aleutian Islands that has been active in recent weeks spewed an ash cloud up to 30,000 feet (9,144 meters) in the sky on Friday, prompting warnings to pilots.
Ash fallout occurs immediately after the eruption and is controlled by particle density. Initially, coarse particles fall out close to source. This is followed by fallout of accretionary lapilli, which is the result of particle agglomeration within the column. [29] Ash fallout is less concentrated during the final stages as the column moves ...
A significant explosion at 1:09 a.m. Friday produced an ash cloud that reached up to 40,000 feet (12,192 meters) and drifted south over the Pacific Ocean. Alaska volcano spews ash cloud high ...