We continue to record tremors higher than the average of 300 units RSAM under the Chaparrastique volcano. The increase has been maintained since 3:00 p.m. Tuesday, July 14.
In the last 24 hours, the recorded values have fluctuated between 296 and 329 units RSAM, with an average of 310 in the reporting period.
The recorded values of the flow of sulfur dioxide by DOAS station in the town of San Jorge has remained above the normal average from June 14 until July 12, showing a slight decline in the last days.
The surveillance camera located on the hill of El Pacayal, recording occasional gas pulses from the central crater and infrared images captured by the surveillance camera located on the same hill, show no evidence of gas released at high temperatures.
Data recorded from 1 July 2015 to date indicate an inverse behavior between RSAM measures and measures the flow of sulfur dioxide (SO2), noting that when increasing the internal vibration, the flow of gases from the central chimney decreases. This suggests an obstacle impeding the partial degassing of the internal system, which causes an increase of seismic vibration (RSAM).
Each of these periods of increase in the value of internal vibrations were completed in small crises of very small scale, such as those that took place on January 26 and April 11 of this year, and 16 times in 2014, with no threshold uniform occurrence. While in the past, these periods are completed without an increase in expulsion of fine materials and have been identified due to the increase in the internal pressure of the system with a subsequent decrease of this value due to the depressurization of volcano.
July 19, 2015. Chaparrastique ( San Miguel) El Salvador :
Source : Marn.
Photo : Actulatino.