There are two HERP seismicity catalogs in this directory:

HERP_1932_1983_Detailed_Catalog: Contains a detailed catalog of 
     HERP seismicity which was derived via analyzing the transcribed
     reading/analysis sheet files using the he_relp location program.

HERP_1932_1983_Condensed_Catalog: Contains a condensed catalog of 
     HERP seismicity with one line per event which was derived from
     the HERP_1932_1983_Detailed_Catalog.

Details of the HERP_1932_1983_Detailed_Catalog format:
Each event is described in either five lines if data are available for 
determination of ML or four lines otherwise.  The third line (whose
first entry is "ML(bdsn)" is not present if data are not available for
the calculation of ML.  

  The 1st line contains, for example:
    yr.doy  hr:mn              Descriptive location
    32.051  06:50   ML = 3.1   8 km S of Morgan Hill, CA

    where:
      yr.doy = origin time year and day of year
      hr:mn = origin time hour and minute
      ML = local magnitude rounded to the nearest tenth
      Descriptive location = distance in km and direction from nearest 
        landmark

  The 2nd line contains:
    OT (UTC)     se_hms     lat   se_lat      lon   se_lon     dep se_dep
    06:50:01.887  2.445    37.0551 10.50   -121.6517  8.93     3.00 (R)

    where:
      The origin time (OT) is given in (UTC) 
      se_hms = standard error of OT in seconds
      lat = latitude (+ = North)
      se_lat = standard error of lat in km
      lon = longitude (+ = East)
      se_lat = standard error of lon in km
      dep = hypocentral depth in km
      se_dep = standard error of dep in km ( "(R)" == depth was restrained)

  The 3rd line contains:
                ML  se_ML  #              ML  se_ML  #
    ML(bdsn) = 2.83 0.135  5   ML(brk) = 2.83 0.135  5   Model = d

    where:
      The first "ML se_ML #) tuple is the ML, its standard error and number
      of observations using the BDSN station adjustments.  The second
      "ML se_ML #) tuple is the ML, its standard error and number
      of observations using the original BRK station adjustments derived
      for stations that housed Wood-Anderson seismographs.

  The 4th line contains:
    se =  1.680   nstn =   3   qual = 3   del_ns =  31.83

    where:
      se = standard error of a single observation in seconds
      nstn = number of observing stations
      qual = solution quality factor which is based on size of the solution
        uncertainty (in OT, lat, lon, and depth (when not constrained))
        ellipsoid semi-major axis (sma):
          0 = sma <= 2.
          1 = sma <= 5.
          2 = sma <= 10.
          3 = sma <= 20.
          4 = sma > 20.
	  see st_sln.f subroutine in ALGORITHMS/HE_RELP directory for details
      del_ns = distance to nearest observing station in km

  The 5th line contains:
    hor_se = 18.475  az_gap = 340  npha =  5  evt_flag = 0  log_sma =  1.2

    where:
      hor_se = horizontal error in km
      az_gap = azimuthal gap in degrees
      npha = number of phases used in solution
      evt_flag = flags events which may not be local or regional
        0 = local or regional earthquake
        1 = noise glitch
        2 = non-clustered stations
        4 = teleseism
        6 => 2 + 4 above
        see st_pdf.f subroutine in ALGORITHMS/HE_RELP directory for details
      log_sma = logarithm of semimajor axis of hypocenter error ellipsoid
        in km


Details of the HERP_1932_1983_Condensed_Catalog format:
Each event has a one line entry in the catalog and the columns are:

  OT_yr.doy = OT year and day of year
  OT_hms    = OT hr:mn:second
  OT_se_hms = OT standard error (sec)
  lat       = Latitude (deg; + = North)
  se_lat    = lat standard error (km)
  lon       = Longitude (deg; + = East)
  se_lon    = lon standard error (km)
  dep       = hypocentral depth (km)
  se_dep    = dep standard error (km)
  ml        = ML (BDSN)
  se_ml     = ML standard error
  nmlo      = number of amplitude observations used in ML calculation
  model     = velocity model
  se        = standard error of a single observation (sec)
  ns        = number of observing stations in solution
  qual      = solution quality (see above description)
  np        = number of observed phases used in solution
  lsma      = logarithm of solution error ellipsoid semi-major axis