There have been four M≥7.7 shocks since 1900 within 125 km (80 mi) of today’s epicenter, in this highly active subduction zone. Image from Google Earth; earthquakes from the ISC-GEM catalog.

There have been four M≥7.7 shocks since 1900 within 125 km (80 mi) of today’s epicenter, in this highly active subduction zone. Image from Google Earth; earthquakes from the ISC-GEM catalog.

There have been four M≥7.7 shocks since 1900 within 125 km (80 mi) of today’s epicenter, in this highly active subduction zone. Image from Google Earth; earthquakes from the ISC-GEM catalog.