Misc. Reference Manual Pages                        NCSN.MECH(5Q)



NAME
     NCSN.MECH, ncsn.mech, calnet.mech  -  description  of  focal
     mechanism (fault plane solution) file format (Y2K compliant)

DESCRIPTION
                              FAULT PLANE SOLUTION FORMAT
                              --------------------------
     The format of the fault plane solutions  produced  by  FPFIT
     are  "Y2K"  HYPO71  summary cards* in columns 1-82 augmented
     with the fault-plane solution parameters. The  FORTRAN  for-
     mats  below are to be used for reading the fields.  For more
     information see
          Reasenberg, P. A., and  D.  Oppenheimer,  1985,  FPFIT,
          FPPLOT,  and FPPAGE: Fortran computer programs for cal-
          culating and displaying  earthquake  fault-plane  solu-
          tions, U.S. Geol. Surv. Open-File Rep. 85-739.

     * "Y2K" version is  identical  to  original  hypo71  format,
     except that
       the century occupies the first 2 columns

     Cols.  Format    Data
     _____  ______    ____

       1-  4 14        Year
       5-  8 2I2, 1X   month, day.
      10- 13 2I2       Hour and minute.
      14- 19 F6.2      Origin time seconds.
      20- 22 F3.0      Latitude (deg).
      23- 23 A1        S for south, blank or N for north
      25- 28 F5.2      Latitude (min).
      29- 32 F4.0      Longitude (deg).
      33- 33 A1        E for east, blank otherwise.
      34- 38 F5.2      Longitude (min).
      39- 45 F7.2, 2X  Depth (km).
      48- 52 F5.2      Magnitude.  See col. 80 for code
      53- 55 I3        Number of P & S times with weights greater than 0.1.
      56- 59 F4.0      Maximum azimuthal gap.
      60- 64 F5.1      Distance to nearest station (km).
      65- 69 F5.2      RMS travel time residual.
      70- 74 F5.1      Horizontal error (km).
      75- 79 F5.1, 2X  Vertical error (km).
      82- 82 A1, 1X    If data source is Hypoinverse, then code designates type of
                       magnitude posted in cols. 46- 50. L=ML based on above location,
                       B=ML from UC Berkeley, C=coda, A=amplitude
      84- 86 F3.0, 1X  Dip direction (downdip azimuth in degrees,clockwise from north)
      88- 89 F2.0      Dip angle in degrees down from horizontal
      90- 93 F4.0, 2X  Rake in degrees: 0=left lateral, 90=reverse, +-180=right
                       lateral, - 90=normal
      96- 99 F4.2, 1X  Solution misfit value. 0=perfect fit, 1=perfect misfit (never
                       exceeds 0.5 in reality).
     101-103 I3, 1X    Number of first motion observations used in solution



SunOS 5.7            Last change: 1999/09/30                    1






Misc. Reference Manual Pages                        NCSN.MECH(5Q)



     105-109 F5.2, 1X  Solution misfit value + 90% confidence estimate.  Useful for
                       testing whether restricted solutions are within uncertainty
                       region of free solution
     111-114 F4.2, 1X  Station distribution ratio (0-1).  Lower numbers indicate
                       data lie near nodal planes.
     116-119 F4.2, 2X  (# of machine picks)/(# of hand picks)
     122-123 F2.0, 1X  maximum half-width of 90% confidence range of strike
     125-126 F2.0, 1X  maximum half-width of 90% confidence range of dip
     128-129 F2.0      maximum half-width of 90% confidence range of rake
     130-130 A1        Convergence flag: C=no convergence; otherwise blank
     131-131 A1        Multiple solution flag: *=multiple; otherwise blank
     132-141 I10       Event ID # found in Hypoinverse archive file

AUTHOR
     This   document   is   maintained   by   David   Oppenheimer
     (oppen@alum.wr.usgs.gov)  Last  revised:  January  20,  1999
     Modified for NCEDC by Doug Neuhauser, UC Berkeley Seismolog-
     ical Laboratory.





































SunOS 5.7            Last change: 1999/09/30                    2