What are the Earthquakes Magnitude classes?
Page Index Historic Earthquakes: Northridge, CA DATE: Jan. 17, 1994 TIME: 4:31 a.m. LAT 37.036¡ N., Long 121.883¡ W. [20 mi west-northwest of Los Angeles] MAGNITUDE: 6.7 Mw DURATION: DEPTH: 11 mi DEATHS: 57 INJURIES: 9,000 PROPERTY DAMAGE: $13-15 Bil COMMENTS: Blind fault (occurred on an unknown “thrust fault”); 7 freeway sites closed due to damage; 2 hospitals closed 150,000 w/o water; 40,000 w/o natural gas; 25,000 people left homeless; 18,480 injuries and 1,533 hospitalized Loma Prieta, CA DATE: Oct. 17, 1989 TIME: 5:04 pm PDT (15.24 seconds after) MAGNITUDE: 7.1 DURATION: 15 seconds DEATHS: 62 INJURIES: 3,757 PROPERTY DAMAGE: >$6 Bil COMMENTS: rupture of 40 km fault stretch (25 mi [40 km] segment of San Andreas fault SW of San Jose slipped ~ 7 ft]; SF Bay Bridge unusable for 1 month; 18,306 homes damaged; 2,575 business damaged; 12,053 people displaced San Francisco, CA 1906Q DATE: April 18, 1906 TIME: 5:12 am MAGNITUDE: 8.25 DURATION: 40 seconds DEATHS: 700-2,500 people (debated)