Alaska_ITRF2014 Network

Station AB21

Last observation
Dec 18, 2024(2 days ago)
Closest stations

5 closest stations in all networks

This station is not in any other networks.

NA2014

Plots

Plot showing NA2014 data (All data)

These plots depict the North, East and Up components of the station as a function of time. More detailed explanation »

Dashed vertical lines show offsets (when present) due to:

  • Green – antenna changes from site logs
  • Red – earthquakes
  • Blue – manually entered

Downloads

Velocities

Velocity (mm/yr)Velocity standard deviation (mm/yr)Last observationIntercept (mm)Intercept standard deviation (mm)Reference dateReference yearReference day of year
North10.690.182024-12-18-99.060.472006.3148532006116
East-10.220.192024-12-1890.820.452006.3148532006116
Up3.040.382024-12-18-38.211.372006.3148532006116

Offsets

Decimal date N offset (mm) N uncertainty (mm) E offset (mm) E uncertainty (mm) U offset (mm) U uncertainty (mm) Type Earthquake magnitude Earthquake information Distance from epicenter (km)
2010-04-03 2010.25188 0.12 0.9 -1.58 0.91 5.75 2.21 antenna
2014-06-23 2014.47365 -2.37 1.42 6.14 1.35 -1.49 4.51 earthquake 7.9 usc000rki5 142.8
2020-07-22 2020.55578 -0.25 0.65 -1.59 0.63 0.26 1.8 earthquake 7.8 at00qdux98 1249.7
2021-07-29 2021.57221 1.72 0.49 0.8 0.47 -0.96 1.49 earthquake 8.2 ak0219neiszm 1297.5

Noise

White noise (mm)Amplitude of first power law (mm/yr^(n1/4))n1 (spectral index of first power law)Lower frequency limit for band-pass (BP) filtered noise (cycle/year)Upper frequency limit for band-pass (BP) filtered noise (cycle/year) Number of poles for BP filtered noiseAmplitude of BP filtered noise (mm)n2 (spectral index of second power law)Amplitude of second power law (mm/yr^(n2/4))
North0.851.701.000.500002.0000010.0002.000.50
East0.841.401.000.500002.0000010.0002.000.60
Up3.206.401.000.500002.0000010.0002.000.50

Post-seismic

Decimal date N log amplitude (mm) N log amplitude standard deviation (mm) N time constant (years) E log amplitude (mm) E log amplitude standard deviation (mm) E time constant (years) U log amplitude (mm) U log amplitude standard deviation (mm) U time constant (years)
2014-06-22 2014.47365 0.21 0.49 0.0001 -0.49 0.48 0.0001 0.79 1.42 0.0001

Seasonal

Reference dateReference yearReference day of yearAmplitude of cosine (365.25-day period), mmStandard deviation of cosine amplitude (365.25-day period)Amplitude of sine (365.25-day period), mmStandard deviation of sine amplitude (365.25-day period)Amplitude of cosine (180.625-day period), mmStandard deviation of cosine amplitude (180.625-day period)Amplitude of sine (180.625-day period), mmStandard deviation of sine amplitude (180.625-day period)Amplitude of cosine (14.76-day period), mmStandard deviation of cosine amplitude (14.76-day period)Amplitude of sine (14.76-day period), mmStandard deviation of sine amplitude (14.76-day period)Amplitude of cosine (13.63-day period), mmStandard deviation of cosine amplitude (13.63-day period)Amplitude of sine (13.63-day period), mmStandard deviation of sine amplitude (13.63-day period)
North2006.31485320061160.930.090.200.090.230.060.460.060.030.03-0.050.030.000.03-0.080.03
East2006.31485320061160.380.08-0.090.080.360.060.110.060.040.030.120.03-0.040.020.110.02
Up2006.31485320061161.880.28-1.080.28-0.210.210.580.21-0.010.10-0.120.100.470.100.120.10

ITRF2014

Plots

Plot showing ITRF2014 data (All data)

These plots depict the North, East and Up components of the station as a function of time. More detailed explanation »

Dashed vertical lines show offsets (when present) due to:

  • Green – antenna changes from site logs
  • Red – earthquakes
  • Blue – manually entered

Downloads

Velocities

Velocity (mm/yr)Velocity standard deviation (mm/yr)Last observationIntercept (mm)Intercept standard deviation (mm)Reference dateReference yearReference day of year
North-10.500.212024-12-18143.890.702006.3285422006121
East-12.210.222024-12-18137.610.662006.3285422006121
Up2.440.482024-12-18-53.022.452006.3285422006121

Offsets

Decimal date N offset (mm) N uncertainty (mm) E offset (mm) E uncertainty (mm) U offset (mm) U uncertainty (mm) Type Earthquake magnitude Earthquake information Distance from epicenter (km)
2010-04-03 2010.25188 -4.96 1.84 6.93 1.87 18.16 4.82 antenna
2014-06-23 2014.47365 -1.04 1.44 5.01 1.37 -0.72 4.66 earthquake 7.9 usc000rki5 142.8
2020-07-22 2020.55578 -0.79 0.66 -1.38 0.64 0.95 1.87 earthquake 7.8 at00qdux98 1249.7
2021-07-29 2021.57221 1.45 0.5 1.18 0.47 0.62 1.53 earthquake 8.2 ak0219neiszm 1297.5

Noise

White noise (mm)Amplitude of first power law (mm/yr^(n1/4))n1 (spectral index of first power law)Lower frequency limit for band-pass (BP) filtered noise (cycle/year)Upper frequency limit for band-pass (BP) filtered noise (cycle/year) Number of poles for BP filtered noiseAmplitude of BP filtered noise (mm)n2 (spectral index of second power law)Amplitude of second power law (mm/yr^(n2/4))
North0.851.701.000.500002.0000010.0002.000.50
East0.841.401.000.500002.0000010.0002.000.60
Up3.206.401.000.500002.0000010.0002.000.50

Post-seismic

Decimal date N log amplitude (mm) N log amplitude standard deviation (mm) N time constant (years) E log amplitude (mm) E log amplitude standard deviation (mm) E time constant (years) U log amplitude (mm) U log amplitude standard deviation (mm) U time constant (years)
2014-06-22 2014.47365 -0.24 0.5 0.0001 -0.06 0.49 0.0001 0.61 1.5 0.0001

Seasonal

Reference dateReference yearReference day of yearAmplitude of cosine (365.25-day period), mmStandard deviation of cosine amplitude (365.25-day period)Amplitude of sine (365.25-day period), mmStandard deviation of sine amplitude (365.25-day period)Amplitude of cosine (180.625-day period), mmStandard deviation of cosine amplitude (180.625-day period)Amplitude of sine (180.625-day period), mmStandard deviation of sine amplitude (180.625-day period)Amplitude of cosine (14.76-day period), mmStandard deviation of cosine amplitude (14.76-day period)Amplitude of sine (14.76-day period), mmStandard deviation of sine amplitude (14.76-day period)Amplitude of cosine (13.63-day period), mmStandard deviation of cosine amplitude (13.63-day period)Amplitude of sine (13.63-day period), mmStandard deviation of sine amplitude (13.63-day period)
North2006.32854220061210.530.110.250.110.430.080.170.08-0.130.030.020.030.010.030.110.03
East2006.32854220061210.530.10-0.080.100.220.07-0.030.070.020.03-0.100.030.080.03-0.010.03
Up2006.32854220061211.260.34-0.900.34-0.080.250.020.26-0.030.120.010.12-0.200.12-0.310.12

These results are preliminary. The station positions are unchecked and should not be used for any engineering applications. There may be errors in the antenna heights. The velocities are very dependent on the length of the span of observations. The presence of outliers (errant observations) sometimes contaminates the velocities.

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