W Phase source inversion
Fast and reliable moment tensor estimation Wphase

Great earthquakes (Mw>8.0) generally involve rupture propagation over large distances in a few minutes. In such cases, the point-source approximation is only valid for ultra-long-period seismic waves such as the W phase, which corresponds to the superposition of the first overtones of the Earth normal modes between 100 s and 1000 s. The W phase is conspicuous between the P wave and the surface wave train on broadband displacement records. The W phase source-inversion algorithm was initially developed to provide rapid characterization of the seismic source for tsunami warning purposes and is a reliable and straightforward method to resolve the first-order attributes of large earthquakes.


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