Seismic Signals from 2020 Rose Parade (IMAGE) Seismological Society of America Caption Seismic records showing vibrations caused by motorcycles driving back and forth during 2020 Rose Parade in Pasadena, California. Credit Seismological Research Letters Usage Restrictions Please include credit line License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.