[CIG-SEISMO] specfem input model

[Jeroen Tromp]

Dear Alejandro:

If you are planning to simulate wave propagation "in the North Atlantic 
ocean", with an emphasis on "in", then you need to use the SPECFEM3D 
"Sesame" package, which accommodates fluid-solid coupling and actual 
wave propagation in the fluid. If you are interested in propagating 
surface waves with periods longer than, say, 20 s, in the solid Earth 
underneath the ocean, then you may use SPECFEM3D_GLOBE as is, with the 
OCEANS flag set to .true., simulating wave propagation based on the 
ocean-load approximation (Komatitsch & Tromp, 2002b). If you use the 
one-chunk option, you may still turn 3D model flags on, e.g., S20RTS or 
S362ANI.

Jeroen Tromp

On 12/8/10 9:32 AM, Dimitri Komatitsch wrote:
>
> Hi Alejandro,
>
> Thank you for your interest in the package. I think that 
> SPECFEM3D_GLOBE is more suitable for what you want to do (it can be 
> used directly as is, without any modification). I cc the other 
> developers, who can maybe confirm that (or not) (in particular Brian 
> Savage, Qinya, and people at Princeton).
>
> Our absorbing conditions on the edges of the mesh are not very good 
> yet, we are adding support for CPML absorbing layers but for technical 
> reasons that code is not ready yet therefore for now I suggest you 
> take a model that is larger than what you are interested in (for 
> instance adding 10 degrees to each side or something like that, to 
> avoid spurious edge effects). This will not be needed any more in the 
> next release with CPML absorbing layers but for now in the current 
> version it is safer.
>
> Thank you,
> Best regards,
>
> Dimitri.
>
> On 12/08/2010 02:33 AM, Alejandro Gallego wrote:
>> HI,
>> I am postdoc student at the University of Hawaii and I am trying to
>> use Specfem to model seismic waves in the North Atlantic ocean
>> I am working in an area of 20 x 30 degrees. I have two main questions.
>> 1) Should I use Specfem_Global or Regional to work with different
>> mantle models.
>> I think the regional doesn't include a mantle model. 2) How is the
>> call of the function model_s20rts(   ), I am not clear what kind of
>> interval grid I need as an input and how can I modify this interval.
>> Any advice in how to change mantle model will be very helpful.
>>
>> Thanks for this amaizing software
>>
>> Alejandro
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>>
>