Magnitude 5.8 Earthquake in The 1991 Sierra Madre, California
About 34 years ago • June 28, 1991, 14:43:54 GMT+0
Key Details
Moderate earthquakes may cause minor damage
Depth
Earthquakes are classified by depth: shallow (0-70 km), intermediate (70-300 km), and deep (300-700 km). This event occurred at a shallow depth of 8.0 kilometers.
| Coordinates | 34.2700°N, 117.9930°W |
| Depth | 8.0 km |
| Magnitude Type | mw |
| USGS Status | Reviewed by a seismologist |
| Reports from the Public | 154 reports |
| Tsunami Risk | No significant tsunami risk flagged |
Epicenter location of the Magnitude 5.8 earthquake, The 1991 Sierra Madre, California
Event Summary
A magnitude 5.8 earthquake occurred near The 1991 Sierra Madre, California on June 28, 1991 at 02:43 PM UTC. This shallow earthquake originated at a depth of 8.0 kilometers below the Earth's surface. 154 people reported feeling this earthquake to the USGS. The earthquake was detected by several seismic monitoring stations operated by the USGS. The mw magnitude measurement indicates this was a magnitude event, which is appropriate for earthquakes of this size and depth. Earthquakes of magnitude 4.5 to 5.9 are classified as moderate earthquakes by the USGS. This event contributes to our understanding of seismic activity in the region.
🌍How Many Felt the Quake?
154 people reported feeling this earthquake, with felt intensities reaching very strong shaking (VIII) and estimated shaking up to strong shaking (VII).
Did you feel the shaking? Your story matters—share it with the USGS to help map this quake's impact!
Safety Information
During an earthquake, remember to Drop, Cover, and Hold On. Stay indoors and take cover under a sturdy table or desk, protecting your head and neck. If you're outside, move to an open area away from buildings, trees, and power lines. After the shaking stops, check for injuries and damage, and be prepared for aftershocks. Residents in the affected area should be aware of potential secondary hazards that are common in your region. Prepare an emergency kit with essential supplies including water, non-perishable food, first aid supplies, flashlight, and batteries. Stay informed by following updates from local authorities and emergency services. Consider submitting a felt report to help seismologists better understand this event's impact.