NCSN.MECH(5Q)     MISC. REFERENCE MANUAL PAGES      NCSN.MECH(5Q)



NAME
     NCSN.MECH - description  of  focal  mechanism  (fault  plane
     solution) file format

DESCRIPTION
                              FAULT PLANE SOLUTION FORMAT
                              --------------------------
     The format of the fault plane solutions  produced  by  FPFIT
     are  HYPO71 summary cards in columns 1-80 augmented with the
     fault-plane solution parameters. The FORTRAN  formats  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.

     Cols.  Format    Data
     _____  ______    ____

     1-6    3I2, 1X   Year, month and day.
     8-11   2I2       Hour and minute.
     12-17  F6.2      Origin time seconds.
     18-20  F3.0      Latitude (deg).
     21     A1        S for south, blank otherwise.
     22-26  F5.2      Latitude (min).
     27-30  F4.0      Longitude (deg).
     31     A1        E for east, blank otherwise.
     32-36  F5.2      Longitude (min).
     37-43  F7.2, 2X  Depth (km).
     46-50  F5.2      Magnitude.  See col. 80 for code
     51-53  I3        Number of P & S times with weights greater than 0.1.
     54-57  F4.0      Maximum azimuthal gap.
     58-62  F5.1      Distance to nearest station (km).
     63-67  F5.2      RMS travel time residual.
     68-72  F5.1      Horizontal error (km).
     73-77  F5.1, 2X  Vertical error (km).
     80     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
     82-84  F3.0, 1X  Dip direction (downdip azimuth in degrees,clockwise from north)
     86-87  F2.0      Dip angle in degrees down from horizontal
     88-91  F4.0, 2X  Rake in degrees: 0=left lateral, 90=reverse, +-180=right
                      lateral, -90=normal
     94-97  F4.2, 1X  Solution misfit value. 0=perfect fit, 1=perfect misfit (never
                      exceeds 0.5 in reality).
     99-101 I3, 1X    Number of first motion observations used in solution
     103-107 F5.2, 1X  Solution misfit value + 90% confidence estimate.  Useful for
                      testing whether restricted solutions are within uncertainty
                      region of free solution
     109-112 F4.2, 1X Station distribution ratio (0-1).  Lower numbers indicate
                      data lie near nodal planes.



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NCSN.MECH(5Q)     MISC. REFERENCE MANUAL PAGES      NCSN.MECH(5Q)



     114-117 F4.2, 2X (# of machine picks)/(# of hand picks)
     120-121 F2.0, 1X maximum half-width of 90% confidence range of strike
     123-124 F2.0, 1X maximum half-width of 90% confidence range of dip
     126-127 F2.0     maximum half-width of 90% confidence range of rake
     128     A1       Convergence flag: C=no convergence; otherwise blank
     129     A1       Multiple solution flag: *=multiple; otherwise blank
     130-139 I10      Event ID # found in Hypoinverse archive file

AUTHOR
     This   document   is   maintained   by   David   Oppenheimer
     (oppen@alum.wr.usgs.gov) Last revised: July 12, 1994.  Modi-
     fied by Doug Neuhauser, Seismographic Station, UC Berkeley.











































Sun Release 4.1     Last change: 15 June 1993                   2