USGS Seismic Event Briefing - M 6.9 - The 1989 Loma Prieta, California Earthquake USGS Earthquake Hazards Program M 6.9 - The 1989 Loma Prieta, California Earthquake nc216859 · REVIEWED · Wed, 18 Oct 1989 00:04:15 GMT · 37.0362° N, 121.8798° W Magnitude 6.9 MW Scale [ HilltopAds Ad Slot: Header Banner ] Replace this comment with your HilltopAds tag. P PAGER Loss Impact NO PAGER ALERT IX Maximum Shaking (MMI) 8.5 - Violent T Tsunami Bulletin No Tsunami Threat Warning Esri Sa...