Earthquakes locations are available from the PNSN catalog from 1970 to present.
Select a single date and press "plot" to view earthquakes that occurred on that day.
If you are looking for a earthquakes over a range of time, select the "range" radio
button and enter the two dates of interest. Earthquakes on the map and in the
list are clickable for more information. Only 5000 earthquakes are plotted at a
time. Only earthquakes within 20 km of the volcanic edifice are shown.
Stations are shown with triangles. Click on a triangle to see the webicorders
for that particular station. Webicorders show a record of how the
ground moved at a particular seismograph station. They are divided into the following types of
stations:
- Short-period (red)
- Broadband(blue)
- Strong Motion(black)
The 12 and 24 hour webicorders are updated hourly. The 6 hour webicorders are
live.