Tag Archives: IRIS Seismic data

Seismic Monitor

IRIS Realtime Seismic Monitor


Seismic Monitor allows you to monitor global earthquakes in near real-time, visit seismic stations around the world, and search the web for earthquake or region-related information. You can also view seismograms and make dataset requests via its WILBER interface.

The date and time of the map (in Universal Time) are located in the lower right hand corner.

Earthquakes are shown as colored circles, where the size of the circle tells you the magnitude of the quake, using the legend at the top left of the map. Only earthquakes of magnitude 4.0 or greater are displayed. (Locations and magnitudes are provided to IRIS by the USGS. Earthquakes greater than magnitude 4.0 may be missing from the USGS catalog in some parts of the wor ld because local networks have not yet reported them to the USGS. In such cases please check with your local or national network.)
Circle Color
Age of Earthquake
the last 24 hours    <– animates briefly when page is loaded
from 24 to 48 hours
from 3 days to 2 weeks
from 2 weeks up to 5 years
The distribution of earthquakes over the past 5 years is represented by the purple dots and demonstrates how earthquakes define the boundaries of tectonic plates, as well as the relationship between topography and earthquakes.
The Earth’s shadow shows the line between day and night as well as the progression of the seasons.

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