Station details:
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Code: SJG
Latitude:  18.11167
Longitude:  -66.15000
Elevation:    45.0
Depth: 
Name: San Juan
Region: Puerto Rico
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:
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Checked against station bulletin
XC1R4-WWV
opened 19640923
IDA opened 198206
IRIS-USGS opened 19930526

Data at the ISC for 61 years between 1964 and 2024.

Known station history:
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First and Last use refers to the time period in which the coordinates were used by the ISC.

Code   Station name/Region                                           Latitude  Longitude Elevation   Depth  First use   Last use
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SJG    San Juan                                                      18.11167  -66.15000     457.0         25-08-1999 30-07-2008  
       Puerto Rico

SJG    San Juan (W)                                                  18.11200  -66.15000     457.0         30-07-2008 25-08-1999  
       Puerto Rico