Science ❯ Geology ❯ Seismology ❯ Earthquake Measurement

Magnitude Scales

Pacific Rim Sees Flurry of Moderate Quakes as Guerrero Aftershocks Hit M4.7

Seismologists attribute the cluster to Ring of Fire plate convergence, urging readiness given alert lead times of only seconds.

Magnitude 5 Aftershock Near San Marcos Triggers Mexico City Alert With No Damage Reported

Tajikistan Quake Triggers Predawn Tremors In J&K And Pakistan

Magnitude 6.5 Quake Strikes Near Goroka, Papua New Guinea

Japan Issues Rare Megaquake Advisory as Injuries Rise After M7.5 Off Northern Coast

Magnitude 4.8 Fuengirola Quake Felt Across Southern Spain as Andalucía Activates Preemergency

Calaveras Fault Swarm Rattles East Bay as Dozens of Small Quakes Follow M3.8 Near San Ramon

Great ShakeOut Engages 10 Million Californians as Small Berkeley Quake Underscores Risk

Cebu Earthquake Death Toll Climbs to 69 as Search Continues

USGS Tracks Steady Seismic Activity: M5.9 Off Oregon and M6+ Shocks in Venezuela

Two Small Quakes Rattle Greater Belo Horizonte, Epicenter in Contagem

Mexico Sets Sept. 19 National Drill to Test Cellphone Earthquake Alerts

3.4-Magnitude Earthquake Jolts Pinole, California

Tajikistan Earthquake Revised to Magnitude 5.9, No Damage Reported

Magnitude 3.0 Earthquake Strikes Near Dublin, California