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Your reports help improve earthquake research and emergency response. Location data is only used to determine proximity to earthquakes.
| Level | Intensity | What You Feel |
|---|---|---|
| 1 | Not felt | Not felt except by very few under favorable conditions |
| 2 | Weak | Felt by few people at rest, especially on upper floors |
| 3 | Weak | Felt noticeably indoors, like a truck passing |
| 4 | Light | Felt by many indoors, dishes and windows rattle |
| 5 | Moderate | Felt by nearly everyone, some dishes break, unstable objects tip |
| 6 | Strong | Felt by all, furniture moves, slight damage |
| 7 | Very Strong | Difficult to stand, moderate damage to buildings |
| 8 | Severe | Considerable damage, chimneys fall |
| 9 | Violent | Well-built buildings damaged considerably |
| 10 | Extreme | Most buildings destroyed |
This scale is based on the Modified Mercalli Intensity (MMI) scale, used by the USGS to measure earthquake effects on people, buildings, and the environment.
If you just felt shaking in San Francisco, Oakland, San Jose, or anywhere in the Bay Area, you're in the right place. This page shows you the most recent earthquakes and lets you report what you experienced.
The San Francisco Bay Area is one of the most seismically active regions in the United States. With major fault lines like the San Andreas Fault and the Hayward Fault running through the region, earthquakes are a regular occurrence.
Your reports are valuable! When you report what you felt, you help scientists at the USGS better understand how earthquakes affect different areas. This data improves earthquake hazard assessments and helps communities prepare.
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Common earthquake questions answered