The waveform viewer is known to cause problems for many screen readers. If you are using a screen reader its probably best you stop it before continuing. Stop

: The Canadian National Seismograph Network (CNSN) is undergoing equipment upgrades over the next few years. The seimograms from some stations may not be viewable on the web although we continue to acquire and process data from them. To read about the upgrade, visit the Earthquake Monitoring Network Upgrade Blog . Thank you for your patience and understanding while improvements to the CNSN are taking place.