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qs6inp.dat
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# This is the input file of FORTRAN77 program "qseis06" for calculation of
# synthetic seismograms based on a layered halfspace earth model.
#
# by
# Rongjiang Wang <wang@gfz-potsdam.de>
# GeoForschungsZentrum Potsdam
# Telegrafenberg, D-14473 Potsdam, Germany
#
# Last modified: Potsdam, Nov., 2006
#
# = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
# If not specified, SI Unit System is used overall!
#
# Coordinate systems:
# cylindrical (z,r,t) with z = downward,
# r = from source outward,
# t = azmuth angle from north to east;
# cartesian (x,y,z) with x = north,
# y = east,
# z = downward;
# = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
#
# SOURCE PARAMETERS
# =================
# 1. source depth [km]
#------------------------------------------------------------------------------
1.0 |dble: source_depth;
#------------------------------------------------------------------------------
#
# RECEIVER PARAMETERS
# ===================
# 1. receiver depth [km]
# 2. switch for distance sampling role (1/0 = equidistant/irregular); switch
# for unit used (1/0 = km/deg)
# 3. number of receiver distances (or zero if given later with azimuths)
# 4. if equidistant, then start and end trace distance (> 0); else if > 0,
# distance list (please order the receiver distances from small to large).
# If zero receivers, no list here at all.
# 5. (reduced) time begin [sec] & length of time window [sec], number of time
# samples (<= 2*nfmax in qsglobal.h)
# 6. switch for unit of the following time reduction parameter: 1 = velocity
# [km/sec], 0 = slowness [sec/deg]; time reduction parameter
#------------------------------------------------------------------------------
0.000 |dble: receiver_depth;
1 0 |int: sw_equidistant, sw_d_unit
31 |int: no_distances;
60.0 90.0 |dble: d_1,d_n; or d_1,d_2, ...(no comments in between!);
180.0 300.0 1024 |dble: t_start,t_window; int: no_t_samples;
0 6.5 |int: sw_t_reduce; dble: t_reduce;
#------------------------------------------------------------------------------
#
# WAVENUMBER INTEGRATION PARAMETERS
# =================================
# 1. select slowness integration algorithm (0 = suggested for full wave-field
# modelling; 1 or 2 = suggested when using a slowness window with narrow
# taper range - a technique for suppressing space-domain aliasing);
# 2. 4 parameters for low and high slowness (Note 1) cut-offs [s/km] with
# tapering: 0 < slw1 < slw2 defining cosine taper at the lower end, and 0 <
# slw3 < slw4 defining the cosine taper at the higher end. default values
# will be used in case of inconsistent input of the cut-offs (possibly with
# much more computational effort);
# 3. parameter for sampling rate of the wavenumber integration (1 = sampled
# with the spatial Nyquist frequency, 2 = sampled with twice higher than
# the Nyquist, and so on: the larger this parameter, the smaller the space-
# domain aliasing effect, but also the more computation effort);
# 4. the factor for suppressing time domain aliasing (> 0 and <= 1) (Note 2).
#------------------------------------------------------------------------------
2 |int: sw_algorithm;
0.000 0.000 0.000 0.000 |dble: slw(1-4);
1.00 |dble: sample_rate;
0.01 |dble: supp_factor;
#------------------------------------------------------------------------------
#
# OPTIONS FOR PARTIAL SOLUTIONS
# (only applied to the source-site structure)
# ===========================================
#
# 1. switch for filtering free surface effects (0 = with free surface, i.e.,
# do not select this filter; 1 = without free surface; 2 = without free
# surface but with correction on amplitude and wave form. Note switch 2
# can only be used for receivers at the surface)
# 2. switch for filtering waves with a shallow penetration depth (concerning
# their whole trace from source to receiver), penetration depth limit [km]
#
# if this option is selected, waves whose travel path never exceeds the
# given depth limit will be filtered ("seismic nuting"). the condition for
# selecting this filter is that the given shallow path depth limit should
# be larger than both source and receiver depth.
#
# 3. number of depth ranges where the following selected up/down-sp2oing P or
# SV waves should be filtered
# 4. the 1. depth range: upper and lower depth [km], switch for filtering P
# or SV wave in this depth range:
#
# switch no: 1 2 3 4 other
# filtered phase: P(up) P(down) SV(up) SV(down) Error
#
# 5. the 2. ...
#
# The partial solution options are useful tools to increase the numerical
# significance of desired wave phases. Especially when the desired phases
# are smaller than the undesired phases, these options should be selected
# and carefully combined.
#------------------------------------------------------------------------------
0 |int: isurf;
0 560.0 |int: sw_path_filter; dble:shallow_depth_limit;
0 |int: no_of_depth_ranges;
# 2
# 0.0 5153.0 3
# 0.0 5153.0 4
#------------------------------------------------------------------------------
#
# SOURCE TIME FUNCTION (WAVELET) PARAMETERS (Note 3)
# ==================================================
# 1. wavelet duration [unit = time sample rather than sec!], that is about
# equal to the half-amplitude cut-off period of the wavelet (> 0. if <= 0,
# then default value = 2 time samples will be used), and switch for the
# wavelet form (0 = user's own wavelet; 1 = default wavelet: normalized
# square half-sinusoid for simulating a physical delta impulse; 2 = tapered
# Heaviside wavelet, i.e. integral of wavelet 1)
# 2. IF user's own wavelet is selected, then number of the wavelet time samples
# (<= 1024), and followed by
# 3. equidistant wavelet time samples
# 4 ...(continue) (! no comment lines allowed between the time sample list!)
# IF default, delete line 2, 3, 4 ... or comment them out!
#------------------------------------------------------------------------------
4.0 1 |int:dble: wavelet_duration; sw_wavelet;
# 100 |int: no_w_samples; below dble: w_samples;
# 0.000 0.063 0.127 0.189 0.251 0.312 0.372 0.430 0.486 0.541
# 0.593 0.643 0.690 0.735 0.776 0.815 0.850 0.881 0.910 0.934
# 0.955 0.972 0.985 0.994 0.999 1.000 0.997 0.990 0.979 0.964
# 0.945 0.922 0.896 0.866 0.833 0.796 0.756 0.713 0.667 0.618
# 0.567 0.514 0.458 0.401 0.342 0.282 0.220 0.158 0.095 0.032
# -0.032 -0.095 -0.158 -0.220 -0.282 -0.342 -0.401 -0.458 -0.514 -0.567
# -0.618 -0.667 -0.713 -0.756 -0.796 -0.833 -0.866 -0.896 -0.922 -0.945
# -0.964 -0.979 -0.990 -0.997 -1.000 -0.999 -0.994 -0.985 -0.972 -0.955
# -0.934 -0.910 -0.881 -0.850 -0.815 -0.776 -0.735 -0.690 -0.643 -0.593
# -0.541 -0.486 -0.430 -0.372 -0.312 -0.251 -0.189 -0.127 -0.063 0.000
#------------------------------------------------------------------------------
#
# FILTER PARAMETERS OF RECEIVERS (SEISMOMETERS OR HYDROPHONES)
# ============================================================
# 1. constant coefficient (normalization factor)
# 2. number of roots (<= nrootmax in qsglobal.h)
# 3. list of the root positions in the complex format (Re,Im). If no roots,
# comment out this line
# 4. number of poles (<= npolemax in qsglobal.h)
# 5. list of the pole positions in the complex format (Re,Im). If no poles,
# comment out this line
#------------------------------------------------------------------------------
1.0
0
# (0.0, 0.0), (0.0, 0.0)
0
# (-4.35425, 4.44222), (-4.35425,-4.44222)
#------------------------------------------------------------------------------
#
# OUTPUT FILES FOR GREEN'S FUNCTIONS (Note 4)
# ===========================================
# 1. selections of source types (yes/no = 1/0)
# 2. file names of Green's functions (please give the names without extensions,
# which will be appended by the program automatically: *.tz, *.tr, *.tt
# and *.tv are for the vertical, radial, tangential, and volume change (for
# hydrophones) components, respectively). At least one Green's function
# must be selected for any seismogram output; all must be selected for P-SV
# seismograms, and strike-slip+dip_slip+single_f_h must be selected for SH
# seismograms. If any Green's function is computed, it is also written out.
#------------------------------------------------------------------------------
# explosion strike-slip dip-slip clvd single_f_v single_f_h
#------------------------------------------------------------------------------
1 1 1 1 1 1 |int
'ex-2' 'ss-2' 'ds-2' 'cl-2' 'fz-2' 'fh-2' |char
#------------------------------------------------------------------------------
# OUTPUT FILES FOR AN ARBITRARY POINT DISLOCATION SOURCE
# (for applications to earthquakes)
# ======================================================
# 1. selection (0 = not selected; 1 or 2 = selected), if (selection = 1), then
# the 6 moment tensor elements [N*m]: Mxx, Myy, Mzz, Mxy, Myz, Mzx (x is
# northward, y is eastward and z is downard); else if (selection = 2), then
# Mis [N*m] = isotropic moment part = (MT+MN+MP)/3, Mcl = CLVD moment part
# = (2/3)(MT+MP-2*MN), Mdc = double-couple moment part = MT-MN, Strike [deg],
# Dip [deg] and Rake [deg].
#
# Note: to use this option, the Green's functions above should be computed
# (selection = 1) if they do not exist already.
#
# north(x)
# /
# /\ strike
# *-----------------------> east(y)
# |\ \
# |-\ \
# | \ fault plane \
# |90 \ \
# |-dip\ \
# | \ \
# | \ \
# downward(z) \-----------------------\
#
# 2. switch for azimuth distribution of the stations (0 = uniform azimuth,
# 1 = irregular azimuth angles). If no_distances (in RECEIVER PARAMETERS)
# is zero, the following list (item 3) of distances azimuths defines the
# total number of receivers.
# 3. list of the azimuth angles [deg] for all stations given above (if the
# uniform azimuth is selected, then only one azimuth angle is required).
# If no_distances (in RECEIVER PARAMETERS) is zero, a list of distance,
# azimuth and station name for each receiver follows, one per line. The
# list ends with a distance AND azimuth <= 0 (no count is needed).
#
#------------------------------------------------------------------------------
# Mis Mcl Mdc Strike Dip Rake File
#------------------------------------------------------------------------------
2 0.00 0.00 6.0E+19 120.0 30.0 25.0 'seis-2'
#------------------------------------------------------------------------------
# Mxx Myy Mzz Mxy Myz Mzx File
#------------------------------------------------------------------------------
# 1 -0.36e+019 -5.12e+019 5.48e+019 -6.21e+019 2.40e+019 -3.84e+019 'seis-2'
0
299.0
#------------------------------------------------------------------------------
#
# GLOBAL MODEL PARAMETERS (Note 5)
# ================================
# 1. switch for flat-earth-transform; planet radius (km) [optional, Earth
# assumed]. Earth flattening transformation relies on the planet radius, and
# for synthetics on bodies other than Earth it must be given.
# 2. gradient resolution [%] of vp, vs, and ro (density), if <= 0, then default
# values (depending on wave length at cut-off frequency) will be used
#------------------------------------------------------------------------------
1 |int: sw_flat_earth_transform; dble: planet radius
0.25 0.25 5.0 |dble: vp_res, vs_res, ro_res;
#------------------------------------------------------------------------------
#
# LAYERED EARTH MODEL
# (SHALLOW SOURCE + UNIFORM DEEP SOURCE/RECEIVER STRUCTURE)
# =========================================================
# 1. number of data lines of the layered model (source site)
#------------------------------------------------------------------------------
68 |int: no_model_lines;
#------------------------------------------------------------------------------
#
# MULTILAYERED MODEL PARAMETERS (source site)
# ===========================================
# no depth[km] vp[km/s] vs[km/s] ro[g/cm^3] qp qs
#------------------------------------------------------------------------------
1 0.000 5.8000 3.3600 2.7200 1340.0 600.0
2 20.000 5.8000 3.3600 2.7200 1340.0 600.0
3 20.000 6.5000 3.7500 2.9200 1340.0 600.0
4 35.000 6.5000 3.7500 2.9200 1340.0 600.0
5 35.000 8.0400 4.4700 3.3198 1340.0 600.0
6 77.500 8.0450 4.4850 3.3455 1340.0 600.0
7 120.000 8.0500 4.5000 3.3713 1340.0 600.0
8 165.000 8.1750 4.5090 3.3985 250.0 100.0
9 210.000 8.3000 4.5180 3.4258 250.0 100.0
10 210.000 8.3000 4.5220 3.4258 360.0 150.0
11 260.000 8.4825 4.6090 3.4561 360.0 150.0
12 310.000 8.6650 4.6960 3.4864 360.0 150.0
13 360.000 8.8475 4.7830 3.5167 360.0 150.0
14 410.000 9.0300 4.8700 3.5470 360.0 150.0
15 410.000 9.3600 5.0700 3.7557 360.0 150.0
16 460.000 9.5280 5.1760 3.8175 360.0 150.0
17 510.000 9.6960 5.2820 3.8793 360.0 150.0
18 560.000 9.8640 5.3880 3.9410 360.0 150.0
19 610.000 10.0320 5.4940 4.0028 360.0 150.0
20 660.000 10.2000 5.6000 4.0646 360.0 150.0
21 660.000 10.7900 5.9500 4.3714 780.0 300.0
22 710.000 10.9229 6.0797 4.4010 780.0 300.0
23 760.000 11.0558 6.2095 4.4305 780.0 300.0
24 809.500 11.1440 6.2474 4.4596 780.0 300.0
25 859.000 11.2300 6.2841 4.4885 780.0 300.0
26 908.500 11.3140 6.3199 4.5173 780.0 300.0
27 958.000 11.3960 6.3546 4.5459 780.0 300.0
28 1007.500 11.4761 6.3883 4.5744 780.0 300.0
29 1057.000 11.5543 6.4211 4.6028 780.0 300.0
30 1106.500 11.6308 6.4530 4.6310 780.0 300.0
31 1156.000 11.7056 6.4841 4.6591 780.0 300.0
32 1205.500 11.7787 6.5143 4.6870 780.0 300.0
33 1255.000 11.8504 6.5438 4.7148 780.0 300.0
34 1304.500 11.9205 6.5725 4.7424 780.0 300.0
35 1354.000 11.9893 6.6006 4.7699 780.0 300.0
36 1403.500 12.0568 6.6280 4.7973 780.0 300.0
37 1453.000 12.1231 6.6547 4.8245 780.0 300.0
38 1502.500 12.1881 6.6809 4.8515 780.0 300.0
39 1552.000 12.2521 6.7066 4.8785 780.0 300.0
40 1601.500 12.3151 6.7317 4.9052 780.0 300.0
41 1651.000 12.3772 6.7564 4.9319 780.0 300.0
42 1700.500 12.4383 6.7807 4.9584 780.0 300.0
43 1750.000 12.4987 6.8046 4.9847 780.0 300.0
44 1799.500 12.5584 6.8282 5.0109 780.0 300.0
45 1849.000 12.6174 6.8514 5.0370 780.0 300.0
46 1898.500 12.6759 6.8745 5.0629 780.0 300.0
47 1948.000 12.7339 6.8972 5.0887 780.0 300.0
48 1997.500 12.7915 6.9199 5.1143 780.0 300.0
49 2047.000 12.8487 6.9423 5.1398 780.0 300.0
50 2096.500 12.9057 6.9647 5.1652 780.0 300.0
51 2146.000 12.9625 6.9870 5.1904 780.0 300.0
52 2195.500 13.0192 7.0093 5.2154 780.0 300.0
53 2245.000 13.0758 7.0316 5.2403 780.0 300.0
54 2294.500 13.1325 7.0540 5.2651 780.0 300.0
55 2344.000 13.1892 7.0765 5.2898 780.0 300.0
56 2393.500 13.2462 7.0991 5.3142 780.0 300.0
57 2443.000 13.3034 7.1218 5.3386 780.0 300.0
58 2492.500 13.3610 7.1449 5.3628 780.0 300.0
59 2542.000 13.4190 7.1681 5.3869 780.0 300.0
60 2591.500 13.4774 7.1917 5.4108 780.0 300.0
61 2641.000 13.5364 7.2156 5.4345 780.0 300.0
62 2690.500 13.5961 7.2398 5.4582 780.0 300.0
63 2740.000 13.6564 7.2645 5.4817 780.0 300.0
64 2740.000 13.6564 7.2645 5.4817 780.0 300.0
65 2789.670 13.6679 7.2768 5.5051 780.0 300.0
66 2839.330 13.6793 7.2892 5.5284 780.0 300.0
67 2889.000 13.6908 7.3015 5.5515 780.0 300.0
68 2889.000 8.0088 0.0200 9.9145 57822.0 0.0
# 69 2939.330 8.0963 0.0200 9.9942 57822.0 0.0
# 70 2989.660 8.1821 0.0200 10.0722 57822.0 0.0
# 71 3039.990 8.2662 0.0200 10.1485 57822.0 0.0
# 72 3090.320 8.3486 0.0200 10.2233 57822.0 0.0
# 73 3140.660 8.4293 0.0200 10.2964 57822.0 0.0
# 74 3190.990 8.5083 0.0200 10.3679 57822.0 0.0
# 75 3241.320 8.5856 0.0200 10.4378 57822.0 0.0
# 76 3291.650 8.6611 0.0200 10.5062 57822.0 0.0
# 77 3341.980 8.7350 0.0200 10.5731 57822.0 0.0
# 78 3392.310 8.8072 0.0200 10.6385 57822.0 0.0
# 79 3442.640 8.8776 0.0200 10.7023 57822.0 0.0
# 80 3492.970 8.9464 0.0200 10.7647 57822.0 0.0
# 81 3543.300 9.0134 0.0200 10.8257 57822.0 0.0
# 82 3593.640 9.0787 0.0200 10.8852 57822.0 0.0
# 83 3643.970 9.1424 0.0200 10.9434 57822.0 0.0
# 84 3694.300 9.2043 0.0200 11.0001 57822.0 0.0
# 85 3744.630 9.2645 0.0200 11.0555 57822.0 0.0
# 86 3794.960 9.3230 0.0200 11.1095 57822.0 0.0
# 87 3845.290 9.3798 0.0200 11.1623 57822.0 0.0
# 88 3895.620 9.4349 0.0200 11.2137 57822.0 0.0
# 89 3945.950 9.4883 0.0200 11.2639 57822.0 0.0
# 90 3996.280 9.5400 0.0200 11.3127 57822.0 0.0
# 91 4046.620 9.5900 0.0200 11.3604 57822.0 0.0
# 92 4096.950 9.6383 0.0200 11.4069 57822.0 0.0
# 93 4147.280 9.6848 0.0200 11.4521 57822.0 0.0
# 94 4197.610 9.7297 0.0200 11.4962 57822.0 0.0
# 95 4247.940 9.7728 0.0200 11.5391 57822.0 0.0
# 96 4298.270 9.8143 0.0200 11.5809 57822.0 0.0
# 97 4348.600 9.8540 0.0200 11.6216 57822.0 0.0
# 98 4398.930 9.8920 0.0200 11.6612 57822.0 0.0
# 99 4449.260 9.9284 0.0200 11.6998 57822.0 0.0
#100 4499.600 9.9630 0.0200 11.7373 57822.0 0.0
#101 4549.930 9.9959 0.0200 11.7737 57822.0 0.0
#102 4600.260 10.0271 0.0200 11.8092 57822.0 0.0
#103 4650.590 10.0566 0.0200 11.8437 57822.0 0.0
#104 4700.920 10.0844 0.0200 11.8772 57822.0 0.0
#105 4751.250 10.1105 0.0200 11.9098 57822.0 0.0
#106 4801.580 10.1349 0.0200 11.9414 57822.0 0.0
#107 4851.910 10.1576 0.0200 11.9722 57822.0 0.0
#108 4902.240 10.1785 0.0200 12.0021 57822.0 0.0
#109 4952.580 10.1978 0.0200 12.0311 57822.0 0.0
#110 5002.910 10.2154 0.0200 12.0593 57822.0 0.0
#111 5053.240 10.2312 0.0200 12.0867 57822.0 0.0
#112 5103.570 10.2454 0.0200 12.1133 57822.0 0.0
#113 5153.900 10.2578 0.0200 12.1391 57822.0 0.0
#114 5153.900 11.0914 3.4385 12.7037 780.0 300.0
#115 5204.610 11.1036 3.4488 12.7289 780.0 300.0
#116 5255.320 11.1153 3.4587 12.7530 780.0 300.0
#117 5306.040 11.1265 3.4681 12.7760 780.0 300.0
#118 5356.750 11.1371 3.4770 12.7980 780.0 300.0
#119 5407.460 11.1472 3.4856 12.8188 780.0 300.0
#120 5458.170 11.1568 3.4937 12.8387 780.0 300.0
#121 5508.890 11.1659 3.5013 12.8574 780.0 300.0
#122 5559.600 11.1745 3.5085 12.8751 780.0 300.0
#123 5610.310 11.1825 3.5153 12.8917 780.0 300.0
#124 5661.020 11.1901 3.5217 12.9072 780.0 300.0
#125 5711.740 11.1971 3.5276 12.9217 780.0 300.0
#126 5762.450 11.2036 3.5330 12.9351 780.0 300.0
#127 5813.160 11.2095 3.5381 12.9474 780.0 300.0
#128 5863.870 11.2150 3.5427 12.9586 780.0 300.0
#129 5914.590 11.2199 3.5468 12.9688 780.0 300.0
#130 5965.300 11.2243 3.5505 12.9779 780.0 300.0
#131 6016.010 11.2282 3.5538 12.9859 780.0 300.0
#132 6066.720 11.2316 3.5567 12.9929 780.0 300.0
#133 6117.440 11.2345 3.5591 12.9988 780.0 300.0
#134 6168.150 11.2368 3.5610 13.0036 780.0 300.0
#135 6218.860 11.2386 3.5626 13.0074 780.0 300.0
#136 6269.570 11.2399 3.5637 13.0100 780.0 300.0
#137 6320.290 11.2407 3.5643 13.0117 780.0 300.0
#------------------------------------------------------------------------------
#
# LAYERED EARTH MODEL
# (ONLY THE SHALLOW RECEIVER STRUCTURE)
# =====================================
# 1. number of data lines of the layered model
#
# Note: if the number = 0, then the receiver site is the same as the
# source site, else different receiver-site structure is considered.
# please be sure that the lowest interface of the receiver-site
# structure given given below can be found within the source-site
# structure, too.
#
#------------------------------------------------------------------------------
0 |int: no_model_lines;
#------------------------------------------------------------------------------
#
# MULTILAYERED MODEL PARAMETERS (shallow receiver-site structure)
# ===============================================================
# no depth[km] vp[km/s] vs[km/s] ro[g/cm^3] qp qs
#------------------------------------------------------------------------------
1 0.000 2.900 1.676 2.600 92.00 41.00
2 2.000 2.900 1.676 2.600 92.00 41.00
3 2.000 5.400 3.121 2.600 92.00 41.00
4 7.000 5.400 3.121 2.600 92.00 41.00
5 7.000 6.160 3.561 2.600 576.00 256.00
6 17.000 6.160 3.561 2.600 576.00 256.00
7 17.000 6.630 3.832 2.900 576.00 256.00
8 35.000 6.630 3.832 2.900 576.00 256.00
9 35.000 8.0400 4.4700 3.3198 1340.00 600.00
#---------------------------------end of all inputs----------------------------
Note 1:
The slowness is defined by inverse value of apparent wave velocity = sin(i)/v
with i = incident angle and v = true wave velocity.
Note 2:
The suppression of the time domain aliasing is achieved by using the complex
frequency technique. The suppression factor should be a value between 0 and 1.
If this factor is set to 0.1, for example, the aliasing phase at the reduced
time begin is suppressed to 10%.
Note 3:
The default basic wavelet function (option 1) is (2/tau)*sin^2(pi*t/tau),
for 0 < t < tau, simulating physical delta impuls. Its half-amplitude cut-off
frequency is 1/tau. To avoid high-frequency noise, tau should not be smaller
than 4-5 time samples.
Note 4:
Double-Couple m11/ m22/ m33/ m12/ m23/ m31 Azimuth_Factor_(tz,tr,tv)/(tt)
============================================================================
explosion 1.0/ 1.0/ 1.0/ -- / -- / -- 1.0 / 0.0
strike-slip -- / -- / -- / 1.0/ -- / -- sin(2*azi) / cos(2*azi)
1.0/-1.0/ -- / -- / -- / -- cos(2*azi) / -sin(2*azi)
dip-slip -- / -- / -- / -- / -- / 1.0 cos(azi) / sin(azi)
-- / -- / -- / -- / 1.0/ -- sin(azi) / -cos(azi)
clvd -0.5/-0.5/ 1.0/ -- / -- / -- 1.0 / 0.0
============================================================================
Single-Force fx / fy / fz Azimuth_Factor_(tz,tr,tv)/(tt)
============================================================================
fz -- / -- / 1.0 1.0 / 0.0
fx 1.0/ -- / -- cos(azi) / sin(azi)
fy -- / 1.0/ -- sin(azi) / -cos(azi)
============================================================================
Note 5:
Layers with a constant gradient will be discretized with a number of homogeneous
sublayers. The gradient resolutions are then used to determine the maximum
allowed thickness of the sublayers. If the resolutions of Vp, Vs and Rho
(density) require different thicknesses, the smallest is first chosen. If this
is even smaller than 1% of the characteristic wavelength, then the latter is
taken finally for the sublayer thickness.