Special Report No. 83, Wednesday, September 2
Dated on August 28th , the Chaparrastique volcano showed a downward trend. But it still continues to emit sulfur gases and changes are observed in the seismic activity of the volcano.
The data obtained from the monitoring network installed on the volcano, for interpreting the behavior of the magma chamber, which is fed regularly with the magma subduction from Cocos / Caribbean plates, leading to sudden and radical changes from the ashes emissions and gas, as well as the seismicity of the volcano. This behavior can last for months or years.
During the last 72 hours, the seismic vibration of the volcano has tended to decline, fluctuating between 103 and 184 units RSAM / hour on average, with an average of 138 units, knowing that the average is 50 units RSAM in normal value.
The recording of sulfur dioxide emissions in the DOAS station located in San Jorge also shows lower values. Surveillance cameras show a quiet volcano, no high temperatures are recorded in gas emissions and no reporting of gas pulses are noted.. At 8:15 p.m. on Monday, August 31 , it was reported by the Civil Protection of the municipality of San Jorge, at 8.3 km southwest of the crater, slight sulfur smell.
During most of this period, the air quality conditions were « good » (ppm <0.1). Except between 6:30 p.m. and 22:00 on Monday, they reached an « unhealthy level for vulnerable persons« (0.2 ppm << 1).
As for precipitation in the upper area of the volcano in the last 24 hours there is no registration.
The MARN continues its enhanced device monitoring, and maintaining close communication with the General Directorate of Civil Defense and local observers.
September 04, 2015. Chaparrastique, El Salvador :
Source : Marn.
Photo : correodelorinoco