I have some earthquake data with an attribute field call M and has values c, h , l , m or w.

There is another one called Magnitude so I assume its not that.

Any ideas what M represents and what the codes mean?


  • 1
    $\begingroup$ Could you show maybe a small sample of that data? Maybe the range of values would help. $\endgroup$
    – plannapus
    Commented Jun 21, 2014 at 7:39
  • 3
    $\begingroup$ This could be "Magnitude Type" where c = coda, h = helicorder, l = local, w = moment. Though I am thrown off that m is one of the choices. $\endgroup$
    – f.thorpe
    Commented Jun 22, 2014 at 12:32
  • $\begingroup$ @farrenthorpe I think you're right - have a look at ncedc.org/db/Documents/NewSchemas/PI/v1.6.0/PI.1.6.0/Content/… and scroll down to magtype - you could probably get an answer out of it. $\endgroup$
    – user889
    Commented Dec 20, 2014 at 16:53
  • $\begingroup$ @SabreTooth that one doesn't have an 'm' option either. I think without knowing the source of the data it's tough to say what that 'm' stands for ... I haven't found any magnitude type examples that include 'm' as one of the options. $\endgroup$
    – f.thorpe
    Commented Dec 20, 2014 at 19:18
  • $\begingroup$ @farrenthorpe same here, I am half suspecting that the statement in the question is literally 'm or w' But, you're right, we need the source. $\endgroup$
    – user889
    Commented Dec 20, 2014 at 22:24


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