Heard report of EQ in Idaho and checking the systems sure enough one of the SEIs had a trip.  Just the one though.  See the attached: The GS13 shows the arrival but didn't exceed trip limits until some secondary waves.  The vertical sensors are noticably much quieter than the horizontals.  The trip was 2 minutes after the event so this seems the reasonable cause.  ITMX back to fully isolated no problems.