23.3.1 Running HASH from EEV

Polarities and amplitudes are picked like for FOCMEC. When running the program, the amplitudes are corrected like for FOCMEC (actually done by FOCMEC) so the Q-correction will use the Q-relation given in focmec.def (see FOCMEC description above). The same output, as for FOCMEC, with the available amplitudes, their ratios and corrections will be shown and the control is the handed over to HASH. The questions are:

  Grid angle for focal mech. search, enter for def 2            Comment: Smallest is 2

  Max number of polarity errors, default is  0                  Comment: Default
  Max average error in amp rat, log10, def 0.1                  Comment: default 0.1 selected

  Enter angle for computing mechanisms probability, def is 60   Comment. Default 60 deg. Sel.

  Enter probability threshold for multiples, def is 0.1         Comment: Default 0.1 selected

Now is following the FOCMEC amplitude information, not shown \bgroup\color{black}$ \ldots$\egroup

 Number of polarities is                      :    11
 Number of amplitude ratios is                :     5
 Minimum number of polarity misfits overall   :     0     
 Minimum average amplitude error overall      :  0.13
 New number of pol. misfits inc. extra is     :     1
 New average amp limit inc. extra             :  0.23
 Minimum average amplitude error for pol ok   :  0.27
 New average amp limit is                     :  0.37
 Number of solutions found                         92

 Strike,dip,rake               197.3    66.5  -157.4
 Fault+aux plane uncertainty    23.2    10.3

Explanations of input:

The "mechanism probability" is the probability that the real mechanism is "close" to the preferred mechanism, within "angle for computing mechanisms probability" where angle define "close." If there are clustered outliers, alternative solutions (or "multiples") are found based on those outliers. You can set the minimum probability for the multiples (i.e. ignore multiples with a low probability.)

Peter Voss : Tue Jun 8 13:38:42 UTC 2021