Input Files for OASR

The input data are structured in 9 blocks. The first 5 blocks, shown in Table 1, specify the title, options, environmental parameters, together with the desired grazing angle and frequency sampling. The last 4 blocks, outlined in Tables 1 and 2, contain axis specifications for the graphical output. Some of these blocks should always be included and others only if certain options have been specified. The single blocks and parameters are described in detail in the following.

 

Table 1: Layout of OASR input files: I. Calculation and plot 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: 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 IV: FREQUENCY SAMPLING
FMIN,FMAX,NRFR,NFOU	FMIN: Minimum frequency	Hz	FMIN>0
	FMAX: Maximum frequency	Hz	FMAX>0
	NRFR: Number of frequencies	-	NRFR
	NFOU: Plot output increment	-	NFOU
BLOCK V: ANGLE/SLOWNESS SAMPLING
AMIN,AMAX,NRAN,NAOU	AMIN: Minimum angle/slowness	dg/(s/km)	AMIN
	AMAX: Maximum angle/slowness	dg/(s/km)	AMAX
	NRAN: Number of angles/slownesses	-	NRAN
	NAOU: Plot output increment	-	NAOU
BLOCK VI: ANGLE/SLOWNESS AXES
ALEF,ARIG,ALEN,AINC	ALEF: Left border, angle/slws axis	dg/(s/km)	-
RALO,RAUP,RALN,RAIN	ARIG: Right border, angle/slws axis	dg/(s/km)	-
(only for NFOU>0)	ALEN: Length of angle/slws axis	cm	ALEN>0
	AINC: Distance between tick marks	dg/(s/km)	AINC>0
	RALO: Lower border of R-loss axis	dB	-
	RAUP: Upper border of R-loss axis	dB	-
	RALN: Length of loss and phase axes	cm	RALN>0
	RAIN: R-loss axis tick mark interval	dB	RAIN>0

 

Table 2: Layout of OASR input files: II. Plot parameters.

Input parameter	Description	Units	Limits
BLOCK VII: LOSS/FREQUENCY AXES
FLEF,FRIG,FLEN,FINC	FLEF: Left border of frequency axis	Hz	-
RFLO,RFUP,RFLN,RFIN	FRIG: Right border of frequency axis	Hz	-
(only for NAOU>0)	FLEN: Length of frequency axis	cm	FLEN>0
	FINC: Distance between tick marks	Hz	FINC>0
	RFLO: Lower border of R-loss axis	dB	-
	RFUP: Upper border of R-loss axis	dB	-
	RFLN: Length of loss and phase axes	cm	RALN>0
	RFIN: R-loss axis tick mark interval	dB	RAIN>0
BLOCK VIII: LOSS CONTOUR PLOTS (Option C)
ALEF,ARIG,ALEN,AINC	ALEF: Left border, angle/slws axis	dg/(s/km)	-
FRLO,FRUP,OCLN,NTKM	ARIG: Right border, angle/slws axis	dg/(s/km)	-
ZMIN,ZMAX,ZINC	ALEN: Length of angle/slws axis	cm	ALEN>0
(only for option C)	AINC: Distance between tick marks	dg/(s/km)	AINC>0
	FRLO: Lower border of frequency axis	Hz	FRLO>0
	FRUP: Upper border of frequency axis	Hz	FRUP>0
	OCLN: Length of one octave	cm	OCLN>0
	NTKM: Number of tickmarks pr octave	-	NTKM>0
	ZMIN: Minimum contour level	dB	-
	ZMAX: Maximum contour level	dB	-
	ZINC: Contour level increment	dB	ZINC>0
BLOCK IX: SVP AXES
VLEF,VRIG,VLEN,VINC	VLEF: Wave speed at left border	m/s	-
DVUP,DVLO,DVLN,DVIN	VRIG: Wave speed at right border	m/s	-
(only for option Z)	VLEN: Length of wave speed axis	cm	VLEN>0
	VINC: Wave speed tickmark distance	m/s	VINC>0
	DVUP: Depth at upper border	m	-
	DVLO: Depth at lower border	m	-
	DVLN: Length of depth axis	cm	DVLN>0
	DVIN: Depth axis tickmark distance	m	DVIN>0