Station details:
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Code: SHW
Latitude:  46.19250
Longitude: -122.23700
Elevation:  1423.0
Depth: 
Name: Mount Saint Helens
Region: Washington,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
     
     

      

      

      

     
    
   
 

Station comments:
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opened 19721025
USTN opened 19781016

Data at the ISC for 48 years between 1974 and 2022.