Alaska Network

Station AC26

Last observation
Jan 25, 2022
Closest stations

5 closest stations in all networks

NA-fixed

Plots

Plot showing NA-fixed 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
North3.440.932022-01-25326.3569.292008.3887752008143
East-0.740.952022-01-25-112.4571.242008.3887752008143
Up5.012.292022-01-25-67.71166.812008.3887752008143

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)
2015-05-29 2015.4052 -1.26 0.57 -1.84 0.53 3.34 1.98 earthquake 6.7 ak11610140 226.6
2015-06-18 2015.45996 -2.94 0.58 -1.19 0.53 -6.83 2 antenna
2016-01-24 2016.06297 42.51 8.83 -13.09 8.84 -4.32 23.14 earthquake 7.1 us10004gqp 164.1
2018-01-23 2018.06023 7.91 1.59 -7.08 1.48 -12.39 5.47 earthquake 7.9 us2000cmy3 389.4
2018-06-08 2018.43258 1.64 0.65 0.58 0.61 -2.47 2.15 antenna
2018-11-30 2018.9117 0.7 0.51 -0.22 0.48 2.18 1.62 earthquake 7 ak20419010 419.7
2020-07-22 2020.55578 -2.01 0.51 -1.58 0.48 -1.17 1.65 earthquake 7.8 at00qdux98 444.4
2020-10-19 2020.79945 -2.03 0.51 -1.61 0.48 1.99 1.65 earthquake 7.6 us6000c9hg 525.6
2021-07-29 2021.57221 -6.87 1.56 3.02 1.45 1.09 5.36 earthquake 8.2 ak0219neiszm 392.8

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)
1999-12-05 1999.92813 238 50.5 0.0001 -81.41 51.72 0.0001 -51.34 123.63 0.0001
2001-01-10 2001.02464 -62 13.22 0.0001 21.6 13.57 0.0001 10.57 32.02 0.0001
2001-07-27 2001.56947 -246.84 52.48 0.0001 85.03 53.78 0.0001 48.76 128.17 0.0001
2016-01-24 2016.06297 -9.8 2.36 0.0001 3.34 2.37 0.0001 0.58 6.07 0.0001
2018-01-23 2018.06023 0.78 0.58 0.0001 -3.38 0.55 0.0001 2.69 1.93 0.0001
2021-07-28 2021.57221 -1.02 0.56 0.0001 -2.64 0.53 0.0001 -0.98 1.81 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)
North2008.38877520081431.090.10-1.190.10-0.120.07-0.060.070.070.030.110.03
East2008.3887752008143-0.810.092.030.101.100.060.650.060.000.030.000.03
Up2008.3887752008143-3.540.310.290.320.440.23-0.370.230.000.110.060.11

ITRF2008

Plots

Plot showing ITRF2008 data (All data)

These plots depict the X, Y and Z 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

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)
2015-05-29 2015.4052 -1.56 0.57 -1.75 0.53 3.4 1.98 earthquake 6.7 ak11610140 226.6
2015-06-18 2015.45996 -3.07 0.58 -0.76 0.53 -6.81 2 antenna
2016-01-24 2016.06297 38.19 8.83 2.33 8.84 -6.44 23.14 earthquake 7.1 us10004gqp 164.1
2018-01-23 2018.06023 11.85 1.59 -6.09 1.48 -9.96 5.47 earthquake 7.9 us2000cmy3 389.4
2018-06-08 2018.43258 -1.72 0.65 2.39 0.61 -2.67 2.15 antenna
2018-11-30 2018.9117 1.02 0.51 -0.47 0.48 1.99 1.62 earthquake 7 ak20419010 419.7
2020-07-22 2020.55578 -2.19 0.51 -1.89 0.48 -0.23 1.65 earthquake 7.8 at00qdux98 444.4
2020-10-19 2020.79945 -2.36 0.51 -1.38 0.48 0.64 1.65 earthquake 7.6 us6000c9hg 525.6
2021-07-29 2021.57221 -5.22 1.56 3.83 1.45 1.07 5.36 earthquake 8.2 ak0219neiszm 392.8

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)
1999-12-05 1999.92813 301.7 50.5 0.0001 -29.07 51.72 0.0001 19.38 123.63 0.0001
2001-01-10 2001.02464 -68.44 13.22 0.0001 12.33 13.57 0.0001 -7.54 32.02 0.0001
2001-07-27 2001.56947 -296.35 52.47 0.0001 37.88 53.78 0.0001 -24.21 128.17 0.0001
2016-01-24 2016.06297 -8.61 2.36 0.0001 -0.71 2.37 0.0001 1.21 6.07 0.0001
2018-01-23 2018.06023 -0.66 0.58 0.0001 -3.53 0.55 0.0001 1.73 1.93 0.0001
2021-07-28 2021.57221 -1.71 0.56 0.0001 -2.92 0.53 0.0001 -0.14 1.81 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)
North2008.38877520081430.880.10-1.420.100.000.07-0.110.070.080.030.110.03
East2008.3887752008143-0.920.092.150.101.020.060.770.060.010.03-0.010.03
Up2008.3887752008143-4.010.310.740.320.610.23-0.290.230.050.110.110.11

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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