The 2001 southern Peru earthquake was a magnitude 8.4 earthquake that occurred at 20:33:14 UTC (15:33:14 local time) on Saturday, June 23, 2001. The quake affected the Peruvian regions of Arequipa, Moquegua and Tacna. It was the most devastating earthquake in Peru since the catastrophic 1970 Ancash earthquake and globally the largest earthquake since the 1965 Rat Islands earthquake.