The TO team is developing numerical models to estimate the location and amount of slip on an earthquake fault. We analyse all large earthquakes, as well smaller ones that occur in areas of special interest to the TO.

• Preliminary Seismological Model: With real-time access to global seismological network data (teleseismic records), we are able to generate slip maps of a fault within a couple of days of an earthquake. Such rapidly generated results are labeled "Preliminary Seismological Model." (See more details on our methodology)

• Updated Model: In the days and months following an earthquake, when additional measurements have become available, such as Global Positioning System (GPS), ground deformation measurements using radar and optical images, and Accelerogram data, we combine these new data with the teleseismic records to generate more refined slip maps, which are labeled "Updated Model."

• Back Projection: We image the rupture propagation of an earthquake by back-projection of the seismic waveforms that are recorded by large arrays at teleseismic distance. This source imaging technique allows us to track the location and migration of the multiple sources of high-frequency radiation that compose an earthquake rupture front.