A new eruption period started on 2 September 2013 with a phreatic explosion, which was followed by more events in the next few days. Strong but variable seismic activity, the observation of thermal anomalies in satellite images and the exhalation of gases characterized this eruption period. Lava effusion began in the summit crater in 2014 and increased after the 2014 Iquique earthquake, culminating in an explosive eruption on April 19, 2014. Volcanic activity decreased afterwards until September 2014. The eruptions were accompanied by earthquakes, rumbling noises from the volcano, ash fall and the forceful ejection of large blocks. In light of the volcanic activity, Peru declared a state of emergency in August 2013 and evacuated the village of Querapi at Ubinas, whose population returned in 2016; The evacuation of the town of Ubinas was also considered. The 2006 and 2013–2017 activity induced the Peruvian government to invest additional resources in volcano monitoring.
