Alicia Asín Pérez, a computer engineer, is one of the founders of Libelium, a company whose star product is its Waspmote hardware platform, capable of wirelessly monitoring any environmental parameter and sending the information to the Internet.  
Among the most outstanding projects of the Aragonese company is the predictive control of eruptions in the Masaya volcano in Nicaragua, with the aim of establishing warning systems for the evacuation of the population. The same has happened at the La Palma volcano. Between October 7, 2017 and June 25, 2021, up to a total of eight seismic series, known as seismic swarms, with similar characteristics were recorded in the southern part of La Palma. 
A scientific study published in early 2021, which took into account the seismic swarms produced until then and used, among others, a novel technique to interpret the observations obtained for years by radars located on different satellites, revealed certain anomalies in the valley of Aridane that would suggest a possible "reactivation" of its subsoil from 2009 or 2010, although the same study acknowledged that it is accepted that in about 80% of situations with such anomalies there were no subsequent volcanic eruptions. 
In the early hours of Saturday, September 11, 2021, a new seismic swarm of low intensity began in the south of the island. Until Sunday, there were 31 seismic movements, with magnitudes ranging between 0.8 and 2 on the mbLg scale.

On Monday, September 13th, 1500 seismic movements were reached in the Cumbre Vieja natural park area, in the municipalities of Fuencaliente, Mazo and El Paso, which led to the activation of the yellow alert (alert level 2 on a scale of 4) in the Special Plan for Civil Protection and Emergency Attention due to Volcanic Risk (Pevolca), by the Canary Islands Government. 
During Sunday, September 19, 327 earthquakes were recorded, among which the 3.8 mbLg earthquake occurred at 11:16 (local time), widely felt on the island and with a depth of 2 km. A 3.1 mbLg earthquake followed shortly after. Since the beginning of the seismic activity, it was noted that the deformation of the island due to the pressure exerted by the magma on the earth's crust had raised the area of the possible eruption to about 15 centimeters. 
In spite of this situation, it was decided not to increase the precautionary measures and it was only decided by the Cabildo of La Palma to begin the evacuation of at least 40 people with reduced mobility and part of the livestock present in the area.

 
QUESTIONS: 
1.- What predictive and preventive measures do you recognize in the text against volcanic hazards? 
2.- If you know of others, cite them.