Peru, 2001
The USGS table lists the 23 June 2001 Arequipa, Peru earthquake at M8.4, 20:33 UTC, epicenter 16.27°S, 73.64°W. That row is the Peru-Chile margin entry on the list of the 20 largest earthquakes since 1900. It is not the 1960 Valdivia earthquake and not the 2010 Maule earthquake. Those are on the Chile page.
Ecuador and Colombia, 1906
The same USGS table lists a 31 January 1906 earthquake at M8.8, 15:36 UTC, epicenter 0.96°N, 79.37°W, which it places on the Ecuador–Colombia coast. That is a different country pair and a different year from Arequipa. Putting both on this page is only so the Chilean-margin page does not pretend they are Chilean events.
| Earthquake | Mag | Time (UTC) | Epicenter |
|---|---|---|---|
| 1906 M8.8 Ecuador–Colombia | 8.8 | 1906-01-31 15:36 UTC | 0.96, -79.37 |
| 2001 M8.4 Arequipa, Peru | 8.4 | 2001-06-23 20:33 UTC | -16.27, -73.64 |
The volcano is not the epicenter
Cotopaxi is a Northern Andean Volcanic Arc stratovolcano in the Smithsonian snapshot. Its summit coordinate is not the 1906 epicenter. Both can fall inside this site’s South America rectangle (latitude −56 to 5, longitude −85 to −65) and still be different points. The rectangle is the map filter documented on the About page.