#COLOMBIA 🇨🇴 SANTANDER AND THE TABLE OF THE SAINTS the cording to official statistics, our Department is located in the second most active seismic nest in the world, where more than 370 telluric movements are presented per month.
Although it is true that the occurrence of small earthquakes releases a certain amount of energy and “relaxes” the concentration of efforts in a geological fault, they do not prevent the occurrence of a large earthquake.
For this reason, the Government of Santander is carrying out a campaign, through the Risk Management Unit, to prevent and prepare Santandereans in an emergency situation.
Plates, faults and even a nest … why does it tremble so much in Santander and the Mesa de los Santos?
The Colombian territory is influenced by three large
tectonic plates (fragments of the lithosphere or outer layer of the earth) that converge in it and infinity of faults that have occurred.
They are the plates of Nazca, of South America and the one of the Caribbean, more the one of Cocos in the west of Central America that presses the first one.
In the Santander area there is also the so-called Santa Marta-Bucaramanga fault.
The Colombian Geological Service reports the possible existence of an old subduction zone (insertion of one plate under another) with high seismicity from Boyacá to Norte de Santander.
In that area, more than 18,000 seismic movements were presented between and 2.018 according to the analysis of the Seismological Network of Colombia.
It is, in that region, a deep seismicity of between 70 and 200 kilometers such as yesterday’s earthquake.
The analysis agrees with what some authors have suggested: “the seismicity is associated to the geodynamics of the Paleocaribe plate and the Seismic Nest of Bucaramanga corresponds to the inflection point of the structure”.
That is the other component of the high seismicity: the existence of the so-called Seismic Nest of Bucaramanga, one of the most active on the planet.
This is given, according to the researcher Carlos Coral-Gómez as “a consequence of a high concentration of efforts caused by the convergence towards the Andean block of the major lithospheric plates of the region (Caribbean, Nazca, South America)”.
All these factors affect the high number of tremors, the immense majority imperceptible and almost all at great depth.
In the rest of the country the seismicity is associated to the subduction of the Pacific plate with superficial and deep events, while the superficial seismicity is a product of the deformation of the crust in the Andean zone contiguous to the main fault systems of the piedmont of the mountain ranges