Hi, what do you want to do?
Getty Images
Seismograph records and registers powerful earthquakes, Philippines, Dec 2009
Seismograph records and registers powerful earthquakes, Philippines, Dec 2009
Incorporated Research Institutions for Seismology
Iris: Seismograms of Common Events: Compiled
A collection of seismic events recorded near Mount Saint Helens. The seismographs located at stations record seismograms like what are shown here. [2:10]
Incorporated Research Institutions for Seismology
Iris: Magnitude Explained: Moment Magnitude vs. Richter Scale
Scientists have developed far-more sensitive seismometers that, with faster computers, have enabled them to record & interpret a broader spectrum of seismic signals than was possible in the 1930's, when the Richter magnitude was...
Incorporated Research Institutions for Seismology
Iris: Travel Time Curves Described
Learn how we can calculate the distance to an epicenter of an earthquake. [1:19]
Incorporated Research Institutions for Seismology
Iris: Magnitude: Changing an Earthquake's Magnitude (Downgrade/upgrade)
In this animation take a look at two magnitude scales, and use two examples of magnitude changing. [6:54]