Recent Earthquakes

Did you feel it?

Did You Feel It? (DYFI) collects information from people who felt an earthquake and creates maps that show what people experienced and the extent of damage. - Visit the "Did You Feel It?" FAQ at the USGS web site

Did you feel it - Felt Report - Tell Us!

Science For a Changing World

  • How it helps us:
    • Immediate high quality and large quantity of data.
    • Cost-effective means of collecting data (replaced expensive and slow postal questionnaires).
    • Helps constrain instrumental data used for ShakeMap and PAGER.
    • Provides data in areas where there are no seismic instruments.
    • Provides data for smaller earthquakes that we can't normally record.
  • How it helps others:
    • Provides a rapid assessment of the extent of shaking and damage for emergency responders.
    • Confirms experiences of shaking for other people.
  • How it helps you:
    • You learn the difference between magnitude and intensity.
    • Helps you feel more in control of your experience.
    • Opportunity to share your experience with others.
    • Opportunity to contribute to the advancement of earthquake science.
  • Some interesting and unusual observations:
  • Mapped out the trajectory of a space shuttle re-entry across Southern California.
  • Sonic booms...