As of that date, the annual seismic activity on the Island remained almost stable for more than 10 years, until the end of 2016, when new seismic series began to be detected. On October 2, 2016, there was a swarm of more than 800 earthquakes inside La Caldera de Las Cañadas, all of very low magnitude, between 0.2 and 0.9 (mbLg) and in an interval of just 5 hours. . Something similar was repeated on June 14, 2019, when an earthquake of magnitude 1.9 occurred (mbLg), located inside the Teide National Park, northeast of the town of Guía de Isora and southwest of Pico Viejo, which was followed by a series of about 500 earthquakes registered in just 2 hours of very low magnitude ( -0.2 to 0.5 mbLg).
Finally, it is worth highlighting the seismic series in the Vilaflor area, formed by more than 500 earthquakes, with magnitudes between 0.0 and 2.3 (mbLg) and depths between 5 and 10 km and purely volcano-tectonic characteristics, which begins in October 2017 and continues today.
The significant increase in the number of seismic stations in the IGN deployed on the island in the last four years has meant that the detection capacity has increased considerably and consequently, it is possible to locate background activity of very low magnitude today and interpret this activity in relation to the Teide-Pico Viejo active complex. Monitoring this microseismicity is very necessary for volcanic surveillance on active islands.