After further investigation, the plume seen in satellite and webcam looks more like water vapor and gases, the Washington VAAC reported at 16:14 UTC on October 18, 2019, shortly after receiving information about possible volcanic ash plume rising above Momotombo volcano.
Seismic data shows no change and daily report from SVO also indicates the same, the center said.
Momotombo's first eruption in 110 years started on December 1, 2015, and ended on April 7, 2016 (VEI 2).
Momotombo is a young stratovolcano that rises prominently above the NW shore of Lake Managua, forming one of Nicaragua's most familiar landmarks. Momotombo began growing about 4 500 years ago at the SE end of the Marrabios Range and consists of a somma from an older edifice that is surmounted by a symmetrical younger cone with a 150 x 250 m (490 x 820 feet) wide summit crater. Young lava flows extend down the NW flank into the 4-km-wide (2.5 miles) Monte Galán caldera.
The youthful cone of Momotombito forms an island offshore in Lake Managua. Momotombo has a long record of Strombolian eruptions, punctuated by occasional stronger explosive activity. The latest eruption, in 1905, produced a lava flow that traveled from the summit to the lower NE base. A small black plume was seen above the crater after a 10 April 1996 earthquake, but later observations noted no significant changes in the crater. A major geothermal field is located on the south flank. This volcano is located within the Ruins of Leon Viejo, a UNESCO World Heritage property. (GVP)
Featured image: Momomtombo volcano on October 18, 2019. Credit: INETER
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