Aftershocks may last up for month after the last earthquake in Chile Several aftershocks have been generated by the 6.9 magnitude earthquake that struck central Chile, that caused fear but not damage to people nor facilities. Although the USGS initially informed that the earthquake was 7.2 magnitude, the value was finally corrected to 6.9 by the Institute, just like local agencies had stated in previous reports. The earthquake happened at 18:38 local time and the epicentre was near Valparaíso, a coastal city in Chile. According to a local agency, 148 aftershocks have been detected, the strongest being a 5.5 magnitude aftershock. While it was informed that these events are a seismic swarm, this information was discarded by an important earthquake expert, who pointed out that the earthquake and its aftershocks are of different magnitude, while a seismic swarm is composed of similar magnitude earthquakes. The last Saturday, a 5.9 magnitude earthquake and a serie of aftershocks ocurred in the same region during the weekend. This is not strange in Chile, one of the most seismic countries in the world.