Figure 1. Behaviour of seismic tremor recorded in the period from August to October 2016, by the station on the northern flank of the volcano. Note the small fluctuations of the downtrend vibration of the last days.

Upon further inspection of the crater on Friday, September 30, pulses were observed, with a smell of sulfur, usual for this volcano with its open channel (Figure 2). No noises were levied, nor any other abnormal activity.

Figure 2. Pulse of sulfur gas that characterize the current state of the volcano.

Thermal monitoring conducted in IR present in the north wall of the crater a maximum temperature of 71.5 ° C. The data examined are within normal limits (Figure 3).

Figure 3. Image visual and its thermal equivalent with a maximum temperature of 71.5 ° C inside the crater.

During the period between September and October 2 of this year, sulfur dioxide gas emitted by the San Miguel volcano fluctuated between 71 and 1 035 t / d, with a slight downward trend (Figure 4) . These values are considered important and typical of an open system of volcanic conduit.

Figure 4. Behavior of sulfur dioxide emissions on the volcano.

In the last 24 hours, 12.2 mm of rain were recorded at the top of the volcano. Protection infrastructure are in good condition and there is no landslide report.
Changes often present on the volcano Chaparrastique are associated with variations in the internal pressure due to fluid movement (magma, gas, steam).
MARN continues its enhanced surveillance of the volcano, maintains close communication with the General Directorate of Civil Protection and local observers.
The Ministry invites journalists and individuals do not approach the top of the volcano, because of the degree of danger that this represents.
Given the decrease in activity of the volcano, according to the protocol, this will be the last special report. If significant changes occur prior report will be issued.
Source : Marn.