Report on Momotombo (Nicaragua) — 10 March-16 March 2021
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 10 March-16 March 2021
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2021. Report on Momotombo (Nicaragua) (Sennert, S, ed.). Weekly Volcanic Activity Report, 10 March-16 March 2021. Smithsonian Institution and US Geological Survey.
12.423°N, 86.539°W; summit elev. 1270 m
All times are local (unless otherwise noted)
The Washington VAAC reported that on 14 March a possible ash emission was visible in webcam and satellite data just above Momotombo. Ash was not visible in a subsequent satellite image captured around six hours later.
Geological Summary. 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 4500 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 wide summit crater. Young lava flows extend down the NW flank into the 4-km-wide 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.