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San Andreas Fault: an earthquake of magnitude greater than 7 could occur within the next week

San Andreas Fault: an earthquake of magnitude greater than 7 could occur within the next week 31

The US Geological Survey (USGS) has identified a swarm of more than 240 earthquakes that have occurred in California, between the San Andreas fault and the Imperial fault, in what could be the prelude of a great earthquake to happen in the next days.


According to the agency’s website, a notable increase in seismic activity is forecast in the area in the coming weeks. This is based on the last recorded earthquakes, which took place yesterday, September 30 and continued until today at a lower rate, ranging from 4.9 to 3 magnitude.

Specialists explain that in a typical week, there is roughly a 3 in 10,000 chance that an earthquake of magnitude greater than 7 will occur in this region, but they caution that ‘during this swarm, the probability of larger earthquakes is significantly greater than the usual ».

Three possible scenarios

The USGS has raised three scenarios, of which they claim that one of them will occur within the next week.

  1. The most probable (90%) is that the activity of the swarm will decrease during the next seven days, but in any case there would be some earthquakes of up to 5.4 magnitude that could cause damage to weak structures and that would be felt in the areas near the faults.
  2. A less likely scenario (9.997%) is that earthquakes of up to 6.9 magnitude occur and that they would be followed by several aftershocks. Something similar already happened in the area in 1981.
  3. While the least encouraging case (0.003%) is that an earthquake of magnitude greater than 7 occurs, which although the probability is small, if it happens it would cause serious damage to nearby communities and would be followed by strong aftershocks.

Although there is no way to know when and where telluric events will occur, statistical analyzes of past events have shown that the probability of large earthquakes is high during swarms, so specialists urge the population in vulnerable areas to take precautions and stay informed.

It should also be noted that it was recently presented A study where it was concluded that the probabilities of a great earthquake due to the San Andrés fault in the next 12 months, had tripled.

Source: USGS


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