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mkhomogsrf.f
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mkhomogsrf.f
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subroutine mkhomogsr(idfl,idfl2,c1,s1,c2,s2,modeuse, lverb,lbin)
c This subroutine reads in output from the excitation program (earth.f).
c Equations are taken from mendiguren (1977) but the signs of
c imaginary parts are opposite to those given. The radial component
c also is multiplied by -1. greens functions have been tested
c against those computed from a normal mode sum for azimuths in all
c four quadrants. differences with mendiguren possibly stem from the
c different coordinate system used in the computation of the excitations
c and ambiguities in mendiguren's paper. This program does agree with Aki
c and Richards derivation (1981).
implicit real*8 (a-h,o-z)
implicit integer*4(i-n)
include 'sizes.inc'
include 'commons.inc'
!include 'units.inc'
integer*4 iinf1,iinf2,iinf3,iinf4,iinf5
parameter (iinf1=15,iinf2=16,iinf3=19,iinf4=21,iinf5=23)
integer*4 iouf1,iouf2,iouf3,iouf4
parameter (iouf1=17,iouf2=18,iouf3=20,iouf4=22)
c real*8 sddep,w,ccc,gmmm,py1,py2,py3,ddt
real*8 sddep,w,ccc,gmmm,py1,py2,py3,ddf
real*8 c1,c2,s1,s2,b1,b2,gb1,gb2
logical*4 lverb, lbin
common/strain/strn(lgrm,9)
complex*16 u,wu,dudr,dudz,dwdr,dwdz,erz,gr
complex*16 v,dvdr,dvdz,erp,gl
dimension sddep(lsd),py(3)
data pi/3.1415926535897931d0/
parameter(eps = 1.11d-7)
c2p1 = 0.5d0*(1.d0+c2)
c2m1 = 0.5d0*(1.d0-c2)
s22 = 0.5d0*s2
c open files containing excitations
c read(idfl) nsrce,npts,ddt,jcom,nbran
if (lbin) then
read(idfl) nsrce,nom,ddf,jcom,nbran
else
read(idfl,*) nsrce,nom,ddf,jcom,nbran
endif
c-- modeuse is a counter to let us know if any modes are actually summed here
modeuse = 0
c check that sample intervals are consistent
!if (df.ne.sngl(ddf)) then
if (dabs(df - ddf).gt.eps) then
df = sngl(ddf)
write(*,103) df
103 format(/,' Frequency interval changed to ',f5.2)
endif
c check that component and input files are consistent
if((jcom.ne.1)) then
write(*,'(a)') ' ***WRONG FILE TYPE***'
nom = 0
close(idfl)
return
endif
c choose source depth
if (lbin) then
read(idfl) (sddep(i),i = 1,nsrce)
else
read(idfl,*) (sddep(i),i = 1,nsrce)
endif
do i = 1,nsrce
sdep(i) = sddep(i)
enddo
c find nearest source depth in file to event depth
!call srcget(d0,nsdp)
call srcget
sourcd = sdep(nsdp)
c initialize arrays and constants
c nper = npts/2
nper = nom
nh1 = nper+1
npts = 2*nom
npts2 = npts+2
c trec = npts*dt
trec = 1.d0/df
c df = 2.*pi/trec
dom = 2.d0*pi*df
c nlen = npts
nlen = nom
do j = 1,9
do i = 1,npts2
strn(i,j) = 0.d0
enddo
enddo
c calculate instrument response: this fills up the resp. We can make this an
c optional read at the main program, but for now we just set the response to "1"
c call inresp(npts)
do i = 2, nh1
resp(i) = dcmplx(1.d0,0.d0)
enddo
c---disply asks for input on number of modes and source depth; skip this now
c call disply
c fact accounts for distance, sign conventions, and fft normalization
c fft sign conventions are as in mendiguren
c fact = -fmom*sqrt(1.e3/dist)*2./trec
c---it appears that the fft used in mkhomo scales by 1/npts. The actual scaling
c shoud be df/nper, and as nper = npts/2, then we have 2*df/npts or (2/trec)/npts.
c So, since it was already scaled by npts, we are left with 2/trec. We eliminate
c this below as we do not fft.
c
fact = -fmom*dsqrt(1.d3/dist)
c read in vertical and radial excitation functions
do 8888 kk = 1,nbran
if (lbin) then
read(idfl,end = 10) nb
else
read(idfl,*,end = 10) nb
endif
do 888 j = 1,nh1
c read in rayleigh excitations
iki = 2*(nper+2-j)
ikr = iki-1
if (lbin) then
read(idfl,err = 222) w,ccc,gmmm,b1,b2,gb1,gb2
else
read(idfl,*,end=222) w,ccc,gmmm,b1,b2,gb1,gb2
endif
c = ccc !sngl(ccc)
gamm = gmmm !sngl(gmmm)
do 43 k = 1,nsrce
if (lbin) then
read(idfl) py1,py2,py3
else
read(idfl,*) py1,py2,py3
endif
if (k.eq.nsdp) then
py(1) = py1 !sngl(py1)
py(2) = py2 !sngl(py2)
py(3) = py3 !sngl(py3)
endif
43 continue
if (nb.ge.mdmin.and.nb.le.mdmx) then
modeuse = modeuse + 1
xk = w/c
wvd = xk*dist
cwd = dcos(wvd)
swd = dsin(wvd)
gr = dcmplx( py(1)*(s2*sol(6)+c2m1*sol(3)+
& c2p1*sol(2))+py(3)*sol(1),py(2)
; *(c1*sol(4)+s1*sol(5)))
atn = dexp(-gamm*dist)
u = gr*dcmplx(atn*b2,0.d0)*dcmplx(swd, cwd)*1.d-5
wu = gr*dcmplx(atn*b1,0.d0)*dcmplx(cwd,-swd)*1.d-5
dudr = -dcmplx(0.d0,xk)*u
dudz = -gb2*u/b2
dwdr = -dcmplx(0.d0,xk)*wu
dwdz = -gb1*wu/b1
erz = .5d0*(dwdr+dudz)
c------
c strn(*,7) w (vertical) component
c strn(*,8) u (radial) component
c strn(*,9) v (transverse)component
c------
if (ivel.gt.0) then
strn(ikr,7) = strn(ikr,7)+ dimag(wu*w)
strn(iki,7) = strn(iki,7)- real(wu*w)
strn(ikr,8) = strn(ikr,8)+ dimag(u*w)
strn(iki,8) = strn(iki,8)- real(u*w)
else
strn(ikr,7) = strn(ikr,7)+ real(wu)*1.d5
strn(iki,7) = strn(iki,7)+ dimag(wu)*1.d5
strn(ikr,8) = strn(ikr,8)+ real(u)*1.d5
strn(iki,8) = strn(iki,8)+ dimag(u)*1.d5
endif
strn(ikr,1) = strn(ikr,1)+ real(dudr)
strn(iki,1) = strn(iki,1)+ imag(dudr)
strn(ikr,3) = strn(ikr,3)+ real(dwdz)
strn(iki,3) = strn(iki,3)+ imag(dwdz)
strn(ikr,5) = strn(ikr,5)+ real(erz)
strn(iki,5) = strn(iki,5)+ imag(erz)
endif
888 continue
222 if (lverb) write(*,333) nb
if (nb.eq.mdmx) go to 11
8888 continue
c11 close(idfl)
c
!11 idfl = idfl+2
11 continue
if (lverb) write(*,*) ' Finished Rayleigh Waves'
c read in love excitations
c read(idfl) nsrce,npts,ddt,jcom,nbran
if (lbin) then
read(idfl2) nsrce,nom,ddf,jcom,nbran
else
read(idfl2,*) nsrce,nom,ddf,jcom,nbran
endif
c check that sample intervals and npts are consistent
!if (df.ne.sngl(ddf)) then
if (dabs(df - ddf).gt.eps) then
write(*,'(a)') ' Error: Love file df is inconsistent!'
write(*,*) ' df, ddf = ', df, dff
npts = 0
close(idfl2)
return
endif
if (nom.ne.nlen) then
write(*,'(a)') ' Error: Love file nom is inconsistent!'
nom = 0
close(idfl2)
return
endif
c check that component and input files are consistent
if((jcom.ne.2)) then
write(*,'(a)') ' ***WRONG FILE TYPE***'
nom = 0
close(idfl2)
return
endif
c choose source depth
if (lbin) then
read(idfl2) (sddep(i),i = 1,nsrce)
else
read(idfl2,*) (sddep(i),i = 1,nsrce)
endif
do i = 1,nsrce
sdep(i) = sddep(i)
enddo
c find nearest source depth in file to event depth
call srcget
!if(sourcd.ne.sdep(nsdp)) then
if (dabs(sourcd - sdep(nsdp)).gt.eps) then
write(*,'(a)') ' Error: Love file source depths inconsistent!'
npts = 0
close(idfl2)
return
endif
c---loop over all available modes
do 7777 kk = 1,nbran
if (lbin) then
read(idfl2,end = 10) nb
else
read(idfl2,*,end = 10) nb
endif
do 777 j = 1,nh1
iki = 2*(nper+2-j)
ikr = iki-1
c read in love excitations
if (lbin) then
read(idfl2,err = 555) w,ccc,gmmm,b1,gb1
else
read(idfl2,*,end = 555) w,ccc,gmmm,b1,gb1
endif
c = ccc
gamm = gmmm
do k = 1,nsrce
if (lbin) then
read(idfl2) py1,py2
else
read(idfl2,*) py1,py2
endif
if (k.eq.nsdp) then
py(1) = py1
py(2) = py2
endif
enddo
if (nb.ge.mdmin.and.nb.le.mdmx) then
xk = w/c
wvd = xk*dist
cwd = dcos(wvd)
swd = dsin(wvd)
gl = dcmplx( py(2)*(-c1*sol(5)+s1*sol(4)),
& py(1)*(c2*sol(6)+s22*(sol(3)-sol(2))) )
atn = dexp(-gamm*dist)
v = gl*dcmplx(atn*b1,0.d0)*dcmplx(cwd,-swd)*1.d-5
dvdr = -dcmplx(0.d0,xk)*v
dvdz = 0.d0
if(b1.ne.0.d0) dvdz = -.5d0*gb1*v/b1
if(ivel.gt.0) then
strn(ikr,9) = strn(ikr,9)+ dimag(v*w)
strn(iki,9) = strn(iki,9)- dreal(v*w)
else
strn(ikr,9) = strn(ikr,9)+ dreal(v)*1.d5
strn(iki,9) = strn(iki,9)+ dimag(v)*1.d5
endif
strn(ikr,2) = 0.d0
strn(iki,2) = 0.d0
strn(ikr,4) = strn(ikr,4)+ dreal(dvdz)
strn(iki,4) = strn(iki,4)+ dimag(dvdz)
erp = .5d0*dvdr
strn(ikr,6) = strn(ikr,6)+ dreal(erp)
strn(iki,6) = strn(iki,6)+ dimag(erp)
endif
777 continue
555 if (lverb) write(*,333) nb
if(nb.eq.mdmx) go to 10
7777 continue
c10 close(idfl)
10 if (lverb) write(*,*) ' Finished Love Waves'
333 format(' mode ',i2,' completed')
c include travel time,pi/4 phase shifts and instr. response
do 666 kk = 2,nh1
iki = 2*kk
ikr = iki-1
w = dfloat(kk-1)*dom
pht = pi*.25d0+w*to
cph = dcos(pht)
sph = dsin(pht)
respr = dreal(resp(kk))
respi = dimag(resp(kk))
crl = (respr*cph-respi*sph)*fact
cri = (respr*sph+respi*cph)*fact
do jj = 1,9
save = (strn(ikr,jj)*crl-strn(iki,jj)*cri)
strn(iki,jj) = (strn(ikr,jj)*cri+strn(iki,jj)*crl)
strn(ikr,jj) = save
enddo
666 continue
c fft to the time domain
c do j = 1,9
c call fftl(strn(1,j),nlen,-2,ier)
c if(ier.ne.0) then
c write(*,'(a)') ' fft error!'
c npts = 0
c return
c endif
c enddo
return
end
subroutine srcget
c subroutine finds source depth in input file nearest to desired depth
c include
c + '/home/keith/codes/surface_waves/earth/common_files/sizes.inc'
c include
c + '/home/keith/codes/surface_waves/earth/common_files/commons.inc'
include 'sizes.inc'
include 'commons.inc'
real*8 dnear, dif
dnear=9999.d0
do 9 i=1,nsrce
dif=dabs(d0-sdep(i))
if(dif.gt.dnear) go to 9
nsdp=i
dnear=dif
9 continue
return
end