There was an earthquake in Southern California at 8:41 AM on Sunday morning. Magnitude 5.2, it wasn't major but many people felt it. In fact, within 24 hours, nearly 27,000 people had logged on to a government Web site to answer a multiple-choice questionnaire. What did they notice? How long did it last? What did they feel? If they were asleep, did it wake them?
Thousands who were moved by Sunday's quake go online to tell seismologists how it felt.