P and S waves arrival times


I am wondering: How are the P and S wave arrival times (picture below from the ShakeNet app) computed on ShakeNet? Are those computed using velocity models (if so, what models?) or picked using automatic phase pickers?

Thank you in advance.



Hello HoussamAlJamal,

The model used in the ShakeNet App is the iasp91 reference model, which is

a parameterized velocity model that has been constructed to be a summary of the travel time characteristics of the main seismic phases.
(SAGE: Data Services Products: EMC-iasp91)

It takes into account the location of your Shake relative to the earthquake data it has and automatically computes the P and S pickers that are displayed on the screen.

No problem at all.

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