San Miguel volcano news & activity updates
San Miguel (Chaparrastique) volcano (El Salvador): increasing activity
Thursday Jun 07, 2018 07:35 AM | BY: T
Gas plume with diffuse ash from San Miguel volcano last week
During the past 2 weeks, the activity at the volcano has been increasing. Visibly, the volcano has been emitting a diffuse gas plume, sometimes containing some ash.
Nr of daily earthquakes under the volcano (image: MARN)
Since 22 May, MARN reports that there has been a significant increase in the number of earthquakes under the summit crater, with predominance of low and high frequency shallow earthquakes located mostly under the active crater. Earthquakes were mostly at magnitudes less than 1.5 and cannot be felt by people.
MARN interprets them as related to sudden and periodic pressure changes in the fluids of the shallow hydrothermal system. This increases the possibility of new ash emissions similar to the sporadic activity observed in recent years. It is less likely (but not impossible) that there is new lava arriving in the summit crater, which could lead up to a potentially more intense eruptive phase.
Thanks to reader Leonardo Torres, who brought this to our attention.
Links / Sources:
Links / Sources:
Monday, Jan 15, 2018
Tuesday, May 09, 2017
During 28 April-5 May seismic and degassing activity decreased at the volcano. ... read all
Saturday, Jan 07, 2017
Sunday, Jun 19, 2016
After several months of calm, explosive activity occurred in the early morning of 18 June 2016, generating small ash plumes and ejecting modest amount of incandescent ejecta around the summit crater. ... read all