I am facing problem for computing the ray paths and L matrix in the 3D slowness-based tetrahedral mesh using SPM method. about ttcr HOT 7 CLOSED

What is the problem? You get an error meeeage?

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Please see the attached image. The DSPM/FSM methods generate an accurate ray path distribution (in yellow).) But the number of ray paths was significantly reduced when I used the SPM method (in white). So, I am unable to generate a reliable L matrix and theoretical travel times.

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Regarding this, I did not get any error messages.

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Are you sure that you have less ray paths? With the SPM, rays are passing through nodes, so it might look like you have less rays because, for coarse meshes the ray paths can be superimposed for most of the trajectory.

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Professor, thank you very much for the clarification, and you're right. Just now, I verified that the number of SPM method-related theoretical travel times matches the number of receivers. The RMS between the SPM and DSPM theoretical travel times is 0.15 sec.

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The tt you get with the SPM are higher because the ray paths are longer due to the constraint that they pass through nodes. You can increase accuray by using the option tt_from_rp, but there would be no real gain over the DSPM & FSM.

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Professor, thank you very much for the valuable information, and I will go through it.

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