[ASK] explosive type seismic sources in Salvus elastic media

[Taufiqurrahman Taufiqurrahman]

Dear Salvus,

I am trying to simulate wave using isotropic type seismic sources, i.e. explosive, etc.

However, using Salvus in elastic media requires a vector type seismic source rather than a scalar type, CMIIW.

How can we apply such cases above or probably something like modify the vector type as an explosive source in Salvus?

Thank you in advance.

Regards,

Taufiq.

[Michael Afanasiev]

Hi Taufiq,

In elastic media, an explosive source is modelled as a diagonal moment tensor. You can pass a moment tensor source to Salvus by specifying --source-spatial-type moment_tensor (instead of vector). The tensor is passed in Voigt notation, meaning in 2D the components are Mxx, Myy, Mxy, and in 3D they are Mxx, Myy, Mzz, Myz, Mxz, Mxy. So, to use an explosive source in 2- and 3-D, you would pass

--source-scale 1,1,0, or

--source-scale 1,1,1,0,0,0

respectively. Of course, you should multiply these terms by some number to get a reasonable amplitude.

Note that we have recently fixed a few things regarding moment tensor sources, so please pull the latest version of salvus_wave. More improvements will follow.

Let me know if that works!

Mike.

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[Taufiqurrahman Taufiqurrahman]

Dear Mike,

Thank you!

I will pull the latest version of salvus_wave and try to run the simulation again with above configuration.

Regards,

Taufiq.

On Tue, Jun 6, 2017 at 5:47 PM, Michael Afanasiev <mafan...@gmail.com> wrote:

Hi Taufiq,

In elastic media, an explosive source is modelled as a diagonal moment tensor. You can pass a moment tensor source to Salvus by specifying --source-spatial-type moment_tensor (instead of vector). The tensor is passed in Voigt notation, meaning in 2D the components are Mxx, Myy, Mxy, and in 3D they are Mxx, Myy, Mzz, Myz, Mxz, Mxy. So, to use an explosive source in 2- and 3-D, you would pass

--source-scale 1,1,0, or

--source-scale 1,1,1,0,0,0

respectively. Of course, you should multiply these terms by some number to get a reasonable amplitude.

Note that we have recently fixed a few things regarding moment tensor sources, so please pull the latest version of salvus_wave. More improvements will follow.

Let me know if that works!

Mike.

On Jun 6, 2017, at 6:22 AM, Taufiqurrahman Taufiqurrahman <mail.tauf...@gmail.com> wrote:

Dear Salvus,

I am trying to simulate wave using isotropic type seismic sources, i.e. explosive, etc.

However, using Salvus in elastic media requires a vector type seismic source rather than a scalar type, CMIIW.

How can we apply such cases above or probably something like modify the vector type as an explosive source in Salvus?

Thank you in advance.

Regards,

Taufiq.

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