4 synchronous strong earthquakes off the coast of Chile (2 magnitude 6.7 and 2 magnitude 6.8) are the harbingers of a devastating earthquake.
If you look closely at the data on seismic events on different monitoring systems, on December 27, 2020 at 21:39 UTC, three or four strong earthquakes occurred in Chile. These are called synchronous earthquakes, each of which has an “s-wave” and “p-wave”.
Officially, all seismic stations announced only one earthquake, as stated on Twitter of the National Seismological Center of Chile.
The focus was located at a depth of 23 km. The earthquake occurred 144 km west of the village of Tolten, the Araucania region.
According to the Chilean radio station Cooperativa, the aftereffects of the earthquake were felt in various southern regions of the country. The hydrographic and oceanographic service of the republic clarified that the characteristics of the earthquake do not correspond to the necessary conditions for the occurrence of a tsunami.
Seismologists later reported several smaller aftershocks in the same region. One earthquake with a magnitude of 3.7 was recorded off the coast west of the city of Valdivia, the epicenter of another with a magnitude of 3.5 was 149 km west of Tolten.
There were no reports of casualties or damage to infrastructure.
Since these large earthquakes were synchronous, seismic stations, at their discretion, choose one of several earthquakes as the main one.
So it’s not that there were none, it’s just that different seismic networks removed 2 (or 3) of those strong shocks.
These earthquakes synchronized with each other at the same epicenter give a direct warning of the events that follow!
Of the 36 known magnitude 8.5 earthquakes in the world since 1500, one third have occurred in Chile.
Apparently, very soon a new earthquake with a magnitude of 8.5 will occur again?
Earlier in December, an earthquake with a magnitude of 6.1 occurred off the coast of the Philippines. Its epicenter was located 22 km from the Sarangani region, and the focus lay at a depth of 27 km. No casualties or damage were reported.