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Meaning of control parameters is as follows: ltdo, oltm, lndo,olnm : origin of short distance conversion [deg. min.], E and S are negative x,y : x,y coordinates of lower left corner (= origin of numerical grid) rel. to short distance origin baselev : top of model in km above sea level h : grid spacing of numerical grid xrad,yrad,zrad : initial search radius [km] for grid search neqs : no. of earthquakes nitmax, fatray : >= 1 no. inversion iterations 0 = do only eq. relocation -1 = compute synthetic traveltimes only if fatray = 1 fat rays are computed if fatray = 0 only tt-times ifxl : fix earthquakes for ifxl iterations vthet : damping of velocity parameters delta_t : fat ray width [s]. should be set as T/2, where T is period of the dominant frequency hitct : inversion blocks with less than hitct fat rays will be fixed in the inversion ires : = 0 no resolution = 1 only diagonal elements of the resolution matrix (RDE) will be computed = 2 full resolution matrix is computed rout,fout,rmscubes : output parameters for rays/fat rays rout = 1 print out ray points fout = 1 print out fat rays rmscubes =1 RMS volumes of earthquake relocation STATION INPUT (file STNS) Station input format is identical to SIMULPS13Q with one exception: Origin for short distance conversion is given via the control file. File must be named STNS. At first comes the number of stations (free format) followed by a station card for each station (one station per line). Station card consists of (format:2x,a4,i2,a1,f5.2,i4,a1,f5.2,f5.2): stat. name, latitude, longitude, elevation [m], Vp station correction Example station file 22 AME23S55.00 69W45.49 850 0.00 MEX23S17.08 70W 3.77 1200 0.00 PRT23S27.41 70W13.52 851 0.00 ERC23S 8.38 69W52.45 1368 0.00 CAC22S59.95 70W18.30 100 0.00 .... EVENT INPUT (file EQKS) Phase data input format is identical to SIMULPS13Q with no exception. The file must be named EQKS. Each event contains: event card (format:a4,a2,1x,a2,i2,1x,f5.2,i3,a1,f5.2,1x,i3,a1,f5.2,2f7.2) iyrmo,iday : year, month, and day ihr, mino, seco : hour, minute, and second ltde, cns, eltm : latitude lnde, cew, elnm : longitude dep : depth [km] rmag : magnitude observed traveltimes to station, six sets per line (format:2a4,f6.2) sta : station name rmki : phase typ and observation weight tt : travel time [s] blank line Example event input: 950818 0721 49.46 23S23.12 70W21.87 37.50 2.20 6 0.00 AME P 0 14.40 MEX P 0 7.86 PRT P 0 6.44 ERC P 0 10.76 ... MJC P 0 6.72 CAC P 0 8.86 PEL P 0 10.75 QC1 P 0 7.20 ... CRP P 0 18.88 AMA P 0 17.07 VEN P 1 13.02 CER P 0 21.62 ... DES P 0 5.98 MJS P 0 6.55 MJP P 0 6.82 MJN P 0 8.06 ... 950818 0947 19.22 23S52.94 70W14.48 53.82 2.50 11 0.00 AME P 0 10.94 MEX P 1 13.02 PRT P 0 10.71 COL P 0 8.56 ... PEL P 0.... -------------------------------------- OUTPUT files printed output (file 'output') Fatomo creates a file named 'output' for the main printout. Among the control parameters and initial velocities, it contains the inversion results. Model pertubations (% change of slowness), HIT-, KHIT-, DWS- matrix, and corrected (final) velocities are arranged in planes starting with the top plane and the UPPER LEFT corner of the model. So, print out of the results is arranged exactly in a way as it is expected, with north at the upper model boundary. Model pertubations and final velocities are given in the SEISMIC grid, HIT-, KHIT-, DWS-matrix, and RDEs (diagonal elements of the resolution matrix) in the INVERSION grid. Using TOMO2GMT (available via www.sg.geophys.ethz.ch/aes/husen) output of FATOMO can be reformatted to be used with GMT-software. final velocity model (file 'f23') The corrected (final) velocity model after the inversion is printed in the file 'f23'. The format is the same as the model-input file 'MOD'. Hence, the new velocities can be used as initial ones for subsequent inversions. synthetic travel times (file 'f24') Relocated hypocenter location are printed to file 'f23' in the same format as the file 'EQKS'. If synthetic travel times are computed (nitmax=-1) they are output in the file 'f24' in the same format as in the file 'EQKS'. mapping of fixed inv. blocks (file 'nodes.out') Mapping from the full grid (all inv. blocks) to inv. blocks participating in the inversion. Zero means inv. block was a priori fixed. This file is needed by 'tomo2gmt' when computing spread values. full resolution matrix (file 'resol.out') For each inv. block participating in the inversion the complete row of the resolution matrix (ires=2) is printed to file 'resol.out'. ray points (file 'ray_XXXX.xyz') Fatomo also computes rays following the steepest gradient in the travel time field. If desired (rout=1) ray points of these rays can be output in files named ray_XXXX.xyz, where XXXX denotes the absolute number of observation. Ray points start at the receiver and are given in x,y,z coordinates relative to the origin of the numerical grid (upper left corner of the model). fat rays (file 'fat_XXXX.xyz') Fat rays can be output in files named 'fat_XXXX.xyz'. As for the ray points, for each observation a new file will be opened. In FATOMO fat rays are represented by cells of the size of the numerical grid spacing and the i,j,k coordinates of these blocks are printed in the fat ray files. Thereby i,j,k coordinates do not represent absolute x,y,z coordinates, but the number of the block in x,y,z direction. Also the absolute number of the numerical and the inversion block are printed out. RMS volumes after earthquake relocation (file 'rmsXXXX.xyz') RMS values of each grid point of the fine grid used in the grid search can be output in the file 'rmsXXXX.xyz'. For each grid point the x,y,z position in km and the corresponding RMS value is given. A new file is opened for each event. Plotting RMS volumes can be useful to assess the location accuracy.
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