International Registry of Seismograph Stations
      maintained jointly by
      International Seismological Centre & World Data Center for Seismology, Denver

      Station details:
      ================

      Code: LF4
      Latitude: 47.41110
      Longitude: -106.94400
      Elevation: 707.0
      Depth:
      Name: LASA F Ring
      Region: Montana,U.S.A.
      Status:

      Arrival picks statistics

      Travel Time Analysis

      On the top graph every dot represents the median residual for one month of data. The green line is the overall median; the orange line shows the standard deviation (smad) based on the median absolute deviation (mad), whilst the red line shows twice the standard deviation (2 * smad). The bottom graph shows the number of residuals for each month. The red columns show the number of residuals whose median (for that month) is outside two standard deviations from the overall median (2 * smad). Red dots indicate a possible clock error.

      Travel time residuals

      Amplitude analysis

      On the top graph every dot represents the median value for that month of data. The green line is the overall median; the orange line shows the standard deviation (smad) based on the median absolute deviation (mad), whilst the red line (if present) shows twice the standard deviation (2 * smad). The bottom graph shows the number of observations for each month. Any red columns show those observations whose monthly median value is greater than twice the standard deviation (2 * smad) from the overall (running) median (shown in the top graph by red dots). Red dots indicate a possible calibration error.


      Station comments: ================= 196601-19740101 Data at the ISC for 7 years between 1966 and 1973.
      International Seismological Centre
      Pipers Lane, Thatcham, Berkshire
      United Kingdom RG19 4NS
      voice: +44 (0)1635 861022
      fax: +44 (0)1635 872351

      web site: http://www.gxjydl.com/
      e-mail: station_reg@isc.ac.uk
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