Station AC27

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
North-8.330.182023-01-3077.910.472004.7118412004261
East2.860.192023-01-30-28.800.452004.7118412004261
Up3.250.342023-01-30-32.161.382004.7118412004261

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)
2009-09-13 2009.69815 0.38 0.49 -0.35 0.46 0.94 1.48 antenna
2015-05-29 2015.4052 0.05 0.49 0.79 0.46 -0.17 1.49 earthquake 6.7 ak11610140 325.1
2016-01-24 2016.06297 -5.81 1.56 0.68 1.34 7.44 4.52 earthquake 7.1 us10004gqp 60.6
2018-01-23 2018.06023 -1.67 1.43 -5.41 1.35 -11.24 4.68 earthquake 7.9 us2000cmy3 468.7
2018-11-30 2018.9117 0.8 0.5 -0.64 0.47 3.31 1.58 earthquake 7 ak20419010 328.8
2020-07-22 2020.55578 -1.63 0.5 -0.38 0.47 1.52 1.58 earthquake 7.8 at00qdux98 538.8
2020-10-19 2020.79945 -1.85 0.5 -3.1 0.47 2.31 1.59 earthquake 7.6 us6000c9hg 615.2
2021-07-29 2021.57221 -7.99 0.49 -1.78 0.47 0.7 1.48 earthquake 8.2 ak0219neiszm 490.1

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)
2016-01-24 2016.06297 2.62 0.53 0.0001 0.13 0.47 0.0001 -1.4 1.41 0.0001
2018-01-23 2018.06023 2.81 0.49 0.0001 -1.29 0.47 0.0001 2.63 1.49 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)
North2004.7118412004261-1.120.080.970.09-0.550.06-0.020.060.060.02-0.150.02
East2004.71184120042610.020.080.170.08-0.150.050.300.050.010.020.100.02
Up2004.71184120042613.840.263.200.26-0.850.19-0.490.19-0.010.09-0.110.09

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-27.070.222023-01-30374.850.652004.7091032004260
East-5.830.232023-01-3078.920.632004.7091032004260
Up2.950.572023-01-30-46.191.952004.7091032004260

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)
2009-09-13 2009.69815 -6.86 1.72 3.11 1.71 3.4 4.98 antenna
2015-05-29 2015.4052 -0.46 0.5 0.97 0.47 -0.51 1.53 earthquake 6.7 ak11610140 325.1
2016-01-24 2016.06297 2.33 1.43 0.91 1.35 7.95 4.65 earthquake 7.1 us10004gqp 60.6
2018-01-23 2018.06023 -1.46 1.45 -6.36 1.36 -10.78 4.79 earthquake 7.9 us2000cmy3 468.7
2018-11-30 2018.9117 1.12 0.5 -0.73 0.47 3.65 1.6 earthquake 7 ak20419010 328.8
2020-07-22 2020.55578 -1.88 0.5 -0.52 0.47 2.57 1.61 earthquake 7.8 at00qdux98 538.8
2020-10-19 2020.79945 -1.73 0.5 -2.77 0.47 0.81 1.62 earthquake 7.6 us6000c9hg 615.2
2021-07-29 2021.57221 -8.22 0.5 -1.57 0.47 2.89 1.51 earthquake 8.2 ak0219neiszm 490.1

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)
2016-01-24 2016.06297 1.89 0.54 0.0001 -0.02 0.48 0.0001 -1.84 1.48 0.0001
2018-01-23 2018.06023 2.41 0.5 0.0001 -0.94 0.48 0.0001 2.81 1.54 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)
North2004.7091032004260-0.810.120.650.12-0.450.08-0.060.08-0.010.03-0.140.03
East2004.70910320042600.220.11-0.020.11-0.120.08-0.020.08-0.020.030.130.03
Up2004.70910320042603.770.373.170.37-1.060.280.140.270.050.13-0.070.13

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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