Note: These "external" links will open in a separate window.
Real-time data typically are recorded at 15-60 minute intervals, stored
onsite, and then transmitted to USGS offices every 1 to 4 hours, depending
on the data relay technique used. Recording and transmission times may be
more frequent during critical events. Data from real-time sites are relayed
to USGS offices via satellite, telephone, and/or radio and are available
for viewing within minutes of arrival.