Computation of MULTI-VALUED TRAVELTIMES in the Marmousi model

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Description of the velocity models

We propose a smooth version of the Marmousi model. The model is sampled to a 24 by 24 m grid. It contains 384 samples in the x-direction and 122 samples in the z-direction. Hence, it is precisely 9192 m long and 2904 m deep. The smooth model is obtained from a 'hard' model by convolving with a spatial Hanning (cos^2) filter of radius 150 m.

You can download the compressed files containind this models (do not forget to select the option save file or load to local disk). They were written under the following format : 


      DO IX=1,384
         DO IZ=1,122
              WRITE(FILE,1) V(IX,IZ)
         ENDDO
      ENDDO
1    FORMAT(F8.0)

Source and receivers locations

The source point for the proposed experiment is located at X=6000m and Z=2800m. A BLACK CROSS indicates its location on the smooth Marmousi model.

We propose that the receivers be sampled at the surface every 24m. That is at every grid point location.

How to provide a result to be displayed in these pages

Dowload the SMOOTH model and solve the problem for the multivalued travel time field (at least at the surface) with your favourite method.
The displayed results will consist of the plot of all traveltimes recorded at the surface receivers. There are 384 receivers equally spaced every 24 meters from 0 to 9192 meters at the surface (every grid point).
The result should be in the form of an ascii file containing only one arrival on each line. Each arrival will be described with two numbers : 
The receiver number (from 1 to 384) /a space/  the recorded arrival time (in seconds)
For example, if you only recorded three arrivals at the surface, at time 1.3 s. at the receiver situated at 288 m., 1.278 s. at 3672 m. and 0.45 s. at 3672 m. again (a multi-valued arrival position), then your file will be of the form : 
12 1.3
153 1.278
153 0.45
Then send your ascii file to : 
Jean-David.Benamou@inria.fr

Pages related to this test problem

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