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...