Environment ❯ Natural Hazards

Seismic Activity

Tectonic Plates Pacific Ring of Fire Earthquake Preparedness Earthquake Risk Risk Management Risk Assessment Regional Analysis Fault Lines Tsunami Risk Impact of Earthquakes Plate Boundaries Cinturón de Fuego Earthquakes Tsunami Warnings Ring of Fire Earthquake-Prone Regions Volcanology Tsunamis Tsunami Risks Earthquake Impact Tsunami Alerts Coastal Regions Regional Earthquakes Basin and Range Province

New Quake Record Revives San Andreas Questions as San Francisco Steps Up Safety Push

City leaders pursue upgrades in light of fresh quake science.

Deep 7.6 Earthquake Strikes Near Tonga’s Neiafu

New Study Finds Cascadia and San Andreas Quakes Have Often Struck in Tandem

Study Finds Cascadia Megathrust Often Triggers Northern San Andreas in Closely Timed Quakes

Canada Updates Seismic Model After Study Flags Yukon’s Tintina Fault as 7.5-Magnitude Threat

Tintina Fault, Once Dormant, Is Straining Toward a Magnitude 7.5+ Quake