Station AC72

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-2.280.182022-09-2518.460.472007.4544832007167
East5.200.202022-09-25-36.270.452007.4544832007167
Up5.270.322022-09-25-32.601.372007.4544832007167

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)
2018-01-23 2018.06023 -2.11 0.49 -1.88 0.46 -1.65 1.47 earthquake 7.9 us2000cmy3 875.4
2018-11-30 2018.9117 -0.91 0.49 -0.24 0.46 0.93 1.47 earthquake 7 ak20419010 336.2
2020-07-22 2020.55578 2 0.63 -2.12 0.66 -3.97 1.4 earthquake 7.8 at00qdux98 1197.1
2021-07-29 2021.57221 2 0.63 -2.12 0.66 -3.97 1.4 earthquake 8.2 ak0219neiszm 1146.7

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

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 (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)
North2007.4544832007167-0.530.10-0.520.100.120.070.020.07-0.070.030.110.03
East2007.45448320071670.080.09-0.270.090.320.06-0.230.060.020.03-0.060.03
Up2007.4544832007167-0.590.303.020.30-0.820.22-0.690.220.050.10-0.090.10

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-20.110.212022-09-25181.540.932008.6379192008234
East-6.150.232022-09-2554.070.912008.6379192008234
Up5.190.432022-09-25-43.552.762008.6379192008234

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)
2018-01-23 2018.06023 -2.9 0.5 -1.88 0.47 -0.94 1.51 earthquake 7.9 us2000cmy3 875.4
2018-11-30 2018.9117 -0.6 0.5 -0.09 0.47 0.55 1.5 earthquake 7 ak20419010 336.2
2020-07-22 2020.55578 1.22 0.65 -2.41 0.68 -2.75 1.48 earthquake 7.8 at00qdux98 1197.1
2021-07-29 2021.57221 1.22 0.65 -2.41 0.68 -2.75 1.48 earthquake 8.2 ak0219neiszm 1146.7

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

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 (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)
North2008.6379192008234-0.180.130.120.130.210.090.100.09-0.070.04-0.060.04
East2008.63791920082340.070.12-0.230.13-0.330.09-0.100.080.100.04-0.020.04
Up2008.63791920082342.240.412.080.42-0.350.310.800.310.250.150.090.15

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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