Block and Ash Flow from the Southeast Lava Flow Station

Time-lapse animation and seismo-acoustic traces from the southeast lava flow of Santiaguito volcano, Guatemala. The active dome is in the background. Many of the events generate clear rock fall seismic and infrasound signals. Look closely to see the lava flowing in the foreground. The animation depicts a two-hour period sampled every five seconds on the morning of January 5, 2012. Time synchronized waveforms were recorded at the lava flow station.

credit: Jeff Johnson