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Input Files for OASP

The input files for OASP is structured in 8 blocks, as outlined in Tables7. In the following we describe the significance of the various blocks, with particular emphasis on differences between SAFARI-FIPP and OASP.


 
Table 7: Layout of OASP input files: Computational parameters.
Input parameter Description Units Limits
BLOCK I: TITLE
TITLE Title of run - 80 ch.
BLOCK II: OPTIONS
A B C Output options - 40 ch.
BLOCK III: SOURCE FREQUENCY
FRC,COFF,IT,VS,VR FRC: Center frequency of source Hz >0
  COFF: Integration contour offset dB/ COFF
  IT: Source pulse type (only for option d)    
  VS,VR: Sou./Rec. velocity (only for option d) m/s  
BLOCK IV: ENVIRONMENT
NL Number of layers, incl. halfspaces - NL
D,CC,CS,AC,AS,RO,RG,CL D: Depth of interface. m -
. CC: Compressional speed m/s CC
. CS: Shear speed m/s -
. AC: Compressional attenuation dB/ AC
. AS: Shear attenuation dB/ AS
  RO: Density g/cm3 RO
  RG: RMS value of interface roughness m -
  CL: Correlation length of roughness m CL>0
BLOCK V: SOURCES
SD,NS,DS,AN,IA,FD,DA SD: Source depth (mean for array) m -
  NS: Number of sources in array - NS>0
  DS: Vertical source spacing m DS>0
  AN: Grazing angle of beam deg -
  IA: Array type - IA
  FD: Focal depth of beam m FDSD
  DA: Dip angle. (Source type 4). deg -
BLOCK VI: RECEIVER DEPTHS
RD1,RD2,NRD RD1: Depth of first receiver m -
  RD2: Depth of last receiver m RD2>RD1
  NRD: Number of receiver depths - NR>0
BLOCK VII: WAVENUMBER SAMPLING
CMIN,CMAX CMIN: Minimum phase velocity m/s CMIN>0
  CMAX: Maximum phase velocity m/s -
NW,IC1,IC2,IF NW: Number of wavenumber samples - >0, -1 (auto)
  IC1: First sampling point - IC1
  IC2: Last sampling point - IC2NW
  IF: Freq. sample increment for kernels  
BLOCK VIII: FREQUENCY AND RANGE SAMPLING
NT,FR1,FR2,DT,R1,DR,NR NT: Number of time samples   NT=2M
  FR1: lower limit of frequency band Hz
  FR2: upper limit of frequency band Hz FR1
  DT: Time sampling increment s > 0
  R1: First range km  
  DR: Range increment km  
  NR: Number of ranges   > 0


next up previous contents
Next: Block I: Title Up: OASP: 2-D Wideband Transfer Previous: Transfer Functions
henrik schmidt
1999-08-25