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emprem1s.f
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subroutine emdlv(r,vp,vs)
c set up information on earth model (specified by
c subroutine call emiasp)
c set dimension of cpr,rd equal to number of radial
c discontinuities in model
save
c parameter (np=12)
parameter (np=11,eqdmax=800.)
character*(*) name
character*20 modnam
dimension cpr(np)
common /emdlc/rd(np)
data rd /
1 1221.5,
2 3480.0,
3 3630.0,
4 5600.0,
5 5701.0,
6 5771.0,
7 5971.0,
8 6151.0,
c 9 6291.0,
a 6346.6,
b 6356.6,
c 6371./
data modnam/'prem1s'/
c
call vprem(r,vp,vs,qp,qs)
return
c
entry emdld(dmax,n,cpr,name)
n=np
do 1 i=1,np
1 cpr(i)=rd(i)
name=modnam
dmax=eqdmax
return
end
subroutine vprem(r,vp,vs,qp,qs)
C VPREM -- Return PREM velocities.
C
C Called via:
C call vprem(r,vp,vs,qp,qs)
C
C Assumes:
C r - radius in km
C
C Returns:
C vp, vs - P and S velocity at that radius in km/sec.
C qp, qs - P and S attenuation factor at 1 sec.
parameter (re=6371.0, qinf=1e30, qkdef=57823.)
eval(x,a,b,c,d) = ((d*x + c)*x + b)*x + a
qavg(qka,qma,vpa,vsa) =
+ vpa**2 / ((vpa**2-4./3.*vsa**2)/qka + 4./3.*vsa**2/qma)
rn = r/re
if (r .lt. 1221.5) then
vp = eval(rn,11.2622,0.,-6.3640,0.)
vs = eval(rn,3.6678,0.,-4.4475,0.)
qs = 84.6
qp = qavg(1327.7,84.6,vp,vs)
else if (r .lt. 3480.0) then
vp = eval(rn,11.0487,-4.0362,4.8023,-13.5732)
vs = eval(rn,0.,0.,0.,0.)
qs = qinf
qp = qkdef
else if (r .lt. 3630.0) then
vp = eval(rn,15.3891,-5.3181,5.5242,-2.5514)
vs = eval(rn,6.9254,1.4672,-2.0834,0.9783)
qs = 312.0
qp = qavg(qkdef,312.0,vp,vs)
else if (r .lt. 5600.0) then
vp = eval(rn,24.952,-40.4673,51.4832,-26.6419)
vs = eval(rn,11.1671,-13.7818,17.4575,-9.2777)
qs = 312.
qp = qavg(qkdef,312.,vp,vs)
else if (r .lt. 5701.0) then
vp = eval(rn,29.2766,-23.6027,5.5242,-2.5514)
vs = eval(rn,22.3459,-17.2473,-2.0834,0.9783)
qs = 312.
qp = qavg(qkdef,312.,vp,vs)
else if (r .lt. 5771.0) then
vp = eval(rn,19.0957,-9.8672,0.,0.)
vs = eval(rn,9.9839,-4.9324,0.,0.)
qs = 143.
qp = qavg(qkdef,143.,vp,vs)
else if (r .lt. 5971.0) then
vp = eval(rn,39.7027,-32.6166,0.,0.)
vs = eval(rn,22.3512,-18.5856,0.,0.)
qs = 143.
qp = qavg(qkdef,143.,vp,vs)
else if (r .lt. 6151.0) then
C 220
vp = eval(rn,20.3926,-12.2569,0.,0.)
vs = eval(rn,8.9496,-4.4597,0.,0.)
qs = 143.
qp = qavg(qkdef,143.,vp,vs)
else if (r .lt. 6291.0) then
C 80
vp = eval(rn,4.1875,3.9382,0.,0.)
vs = eval(rn,2.1519,2.3481,0.,0.)
qs = 80.
qp = qavg(qkdef,80.,vp,vs)
else if (r .lt. 6346.6) then
C 24 km
vp = eval(rn,4.1875,3.9382,0.,0.)
vs = eval(rn,2.1519,2.3481,0.,0.)
qs = 600.
qp = qavg(qkdef,600.,vp,vs)
else if (r .lt. 6356.6) then
vp = eval(rn,6.8,0.,0.,0.)
vs = eval(rn,3.9,0.,0.,0.)
qs = 600.
qp = qavg(qkdef,600.,vp,vs)
else if (r .le. 6371.0) then
vp = eval(rn,5.8,0.,0.,0.)
vs = eval(rn,3.2,0.,0.,0.)
qs = 600.
qp = qavg(qkdef,600.,vp,vs)
else
vp = 0.0
vs = 0.0
qp = 57823
qs = qinf
endif
end