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

Code: HVO
Latitude:  19.42111
Longitude: -155.29300
Elevation:  1240.0
Depth: 
Name: Hawaiian Volcano
Region: Hawaii,U.S.A.
Status: 

        
HVO is an alternative code for UWE

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:
=================

Checked against station bulletin
Hawaiian Volcano Observatory
opened 191208

Data at the ISC for 41 years between 1922 and 1990.