A magnitude 8.3 earthquake has hit off the coast of Chile, shaking buildings in the capital city of Santiago.

By Kenneth Macleod
Thursday, 17th Sept 2015

An 8.3 magnitude earthquake west of Illapel, Chile, occurred as the result of a disturbance between the Nazca and South America plates.

This map shows the location, time and magnitude of the main earthquake as well as other earthquakes and aftershocks in the region.

The data is sourced from a real time feed provided by the US Geological Survey, showing earthquake activity from 1 September 2015, within a 1,000km radius of Santiago.

SOURCE: http://earthquake.usgs.gov/

Cycle through earthquakes and aftershocks:

For each incident reported by US Geological Survey from 1 September 2015, within a 1,000km radius of Santiago.

Legend:

Magnitude: 7 or higher
Magnitude: between 6 - 7
Magnitude: between 5 - 6
Magnitude: 5 or lower

Chart showing earthquakes and aftershocks from 1 September 2015.

"The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph and the magnitude scale is logarithmic. One whole unit of magnitude represents approximately 32 times the energy. This explains why big quakes are so much more devastating than small ones. The amplitude ("size") differences are big enough, but the energy ("strength") differences are huge. The amplitude numbers are neater and a little easier to explain, which is why those are used more often in publications. But it's the energy that does the damage. For example, a magnitude 8.7 is 794 times bigger than a 5.8 quake as measured on seismograms, but the 8.7 quake is about 23,000 times STRONGER than the 5.8." (USGS)