The ashes of Santiaguito, Gamalama and Etna volcanoes.

In Guatemala, the Santiaaguito experienced a strong explosion on August 4 at 10:45; it occurs after a quiet period of several weeks.

The ash plume, estimated at 5,000 meters asl. , could not be observed, due to heavy rainfall related to the passage of Hurricane Earl.
Ash falls are found on San Marcos, Loma Linda Palajunoj and Quetzaltenango. Wet ash rain stick on roofs and cars.

Sources: INSIVUMEH & Conred
 

A press release from the BNPB August 5 indicates that, following the eruption of Gamalama, which continues with the observation date at 6:50 p.m. local of one puff of ash on the east side of the crater (puff remaining pressure release ), the closure of the airport continues until Friday, August 6th.
A total of 10,000 dust masks have been distributed.
 

A Etna, the vent located on the east side of the new crater southeast / NSEC named "u puttusiddu" (small pit) was the site of frequent ash emissions onAugust 4, observed during a visit by Boris Behncke.

An incandescent crack is present on the saddle between the two cones of the southeast crater; this glow is not related to lava, but with rocks heated by the passage of gas at very high temperature, around 700 ° C.

These two sites of activity were also identified by the site Mirova / sat.Modis, which indicates a small thermal anomaly.

Sources: Boris Behncke, INGV Catania volcanologist, Gio Giusa and Mirova