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.


Latest publications

Z. Duputel, H. Kanamori, V.C. Tsai, L. Rivera, L. Meng, J.-P. Ampuero and J. Stock, 2012. The 2012 Sumatra great earthquake sequence, submitted to Earth Planet Sci. Lett., accepted for publication in EPSL.

L. Rivera, H. Kanamori and Z. Duputel. W phase source inversion using the high-rate regional GPS data of the 2011 Tohoku-oki earthquake. American Geophysical Union, Fall 2011.

Z. Duputel, L. Rivera, H. Kanamori, and G. Hayes, 2012. W-phase fast source inversion for moderate to large earhquakes (1990 - 2010), Geophysical Journal International, v. 189, iss. 2, p. 1125-1147.

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