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[SEAOC] Help: Calculate Ms from Ml or Io ...

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Hi,

Does someone know of a formula to calculate:

1. Surface wave magnitude, Ms, from a given epicentral distance, Io (MMS)
   (...and vice versa)?
2. Surface wave magnitude, Ms, from a given local magnitude, Ml (Richter)
   (...and vice versa)?

Thanks in advance for any help.
Peter Rangelow
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