Station details:
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Code: HVD
Latitude: -30.60500
Longitude:   25.49670
Elevation:  1433.0
Depth: 
Name: Gariep Dam
Region: South Africa,South Africa
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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Hendrik Verwoerd Dam
opened 1971

Data at the ISC for 52 years between 1969 and 2024.