Alaska Network

Station AC13

Last observation
Dec 8, 2021
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
North31.240.232021-12-08-201.740.482008.7118412008261
East-16.970.252021-12-08111.080.452008.7118412008261
Up-10.220.462021-12-0865.701.402008.7118412008261

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 -5.26 1.46 2.35 1.38 11.75 4.83 earthquake 6.7 ak11610140 99.5
2016-01-24 2016.06297 2.02 0.51 1 0.48 -0.28 1.65 earthquake 7.1 us10004gqp 444.7
2018-01-23 2018.06023 3.57 2 -3.31 1.92 -13.79 5.92 earthquake 7.9 us2000cmy3 404
2020-07-22 2020.55578 -0.58 1.7 -0.65 1.58 5.32 6.06 earthquake 7.8 at00qdux98 203.6
2020-10-19 2020.79945 -4.99 1.53 -3.82 1.43 -2.18 5.21 earthquake 7.6 us6000c9hg 290
2021-07-29 2021.57221 18.68 2.51 157.65 2.33 49.49 7.15 earthquake 8.2 ak0219neiszm 150.5

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)
2015-05-28 2015.4052 0.47 0.51 0.0001 0.04 0.49 0.0001 -3.04 1.57 0.0001
2018-01-23 2018.06023 0.28 0.64 0.0001 -1.07 0.63 0.0001 3.61 1.77 0.0001
2020-07-22 2020.55578 0.47 0.62 0.0001 0.78 0.58 0.0001 -2.63 2.14 0.0001
2020-10-19 2020.79945 0.24 0.57 0.0001 -0.59 0.54 0.0001 2.35 1.88 0.0001
2021-07-28 2021.57221 -83.92 0.85 0.0001 41.26 0.79 0.0001 4.67 2.38 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)
North2008.7118412008261-0.620.10-0.370.10-0.130.07-0.080.07-0.160.03-0.010.03
East2008.7118412008261-0.180.100.220.10-0.050.070.580.060.020.030.050.03
Up2008.7118412008261-0.610.331.810.320.380.240.720.230.170.110.090.11

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 -5.07 1.46 1.85 1.38 8.27 4.83 earthquake 6.7 ak11610140 99.5
2016-01-24 2016.06297 2.4 0.51 0.62 0.48 -0.66 1.65 earthquake 7.1 us10004gqp 444.7
2018-01-23 2018.06023 12.62 2 -3.87 1.92 -11.16 5.92 earthquake 7.9 us2000cmy3 404
2020-07-22 2020.55578 -1.97 1.7 0.38 1.58 4.29 6.06 earthquake 7.8 at00qdux98 203.6
2020-10-19 2020.79945 -3.58 1.53 -5.76 1.43 -5.48 5.21 earthquake 7.6 us6000c9hg 290
2021-07-29 2021.57221 19.91 2.51 158 2.33 50.01 7.15 earthquake 8.2 ak0219neiszm 150.5

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)
2015-05-28 2015.4052 0.28 0.51 0.0001 0.33 0.49 0.0001 -1.7 1.57 0.0001
2018-01-23 2018.06023 -2.96 0.64 0.0001 -0.67 0.63 0.0001 2.74 1.77 0.0001
2020-07-22 2020.55578 1.03 0.62 0.0001 0.24 0.58 0.0001 -1.8 2.14 0.0001
2020-10-19 2020.79945 -0.44 0.57 0.0001 0.32 0.54 0.0001 2.93 1.88 0.0001
2021-07-28 2021.57221 -84.38 0.85 0.0001 41.15 0.79 0.0001 5.44 2.38 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)
North2008.7118412008261-0.820.10-0.120.10-0.150.070.090.07-0.150.030.000.03
East2008.71184120082610.100.100.210.10-0.130.070.430.060.030.030.020.03
Up2008.7118412008261-0.030.331.990.320.110.240.860.230.110.110.100.11

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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