Station AC41

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)
North2.440.182024-02-1015.520.47
East-6.150.202024-02-1017.900.45
Up0.940.352024-02-10-3.031.38

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)
2014-06-23 2014.47365 -0.04 0.49 1.51 0.46 -0.82 1.48 earthquake 7.9 usc000rki5 1280.4
2015-05-29 2015.4052 0.62 0.49 0.53 0.46 0.44 1.47 earthquake 6.7 ak11610140 258
2017-07-13 2017.52841 -0.46 0.49 0.52 0.46 -2.79 1.5 antenna
2018-01-23 2018.06023 1.66 0.49 -2.66 0.46 -0.46 1.49 earthquake 7.9 us2000cmy3 701.1
2020-07-22 2020.55578 -90.26 1.88 46.17 1.74 -12.28 6.8 earthquake 7.8 at00qdux98 154.2
2020-10-19 2020.79945 198.3 13.27 -162.07 13.93 -66.18 37.09 earthquake 7.6 us6000c9hg 152.5
2021-07-29 2021.57221 -40.17 1.81 74.22 1.97 -6.95 6.25 earthquake 8.2 ak0219neiszm 174.3
2023-07-16 2023.53662 -8.07 0.51 0.14 0.48 -0.75 1.64 earthquake 7.2 us7000kg30 162.8

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)
2020-07-22 2020.55578 -13.36 0.73 0.0001 11.55 0.68 0.0001 -1.14 2.58 0.0001
2020-10-19 2020.79945 -54.23 3.47 0.0001 42.44 3.63 0.0001 16.78 9.76 0.0001
2021-07-28 2021.57221 -3.71 0.73 0.0001 8.43 0.78 0.0001 0.44 2.41 0.0001

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)
North-17.960.222024-02-10248.230.94
East-12.530.242024-02-1067.880.92
Up0.930.522024-02-10-1.662.83

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)
2014-06-23 2014.47365 -0.09 0.5 1.12 0.47 -0.52 1.56 earthquake 7.9 usc000rki5 1280.4
2015-05-29 2015.4052 0.44 0.5 0.57 0.47 0.1 1.52 earthquake 6.7 ak11610140 258
2017-07-13 2017.52841 -0.51 0.5 -0.01 0.47 -3.36 1.56 antenna
2018-01-23 2018.06023 1.31 0.5 -2.75 0.47 -0.01 1.53 earthquake 7.9 us2000cmy3 701.1
2020-07-22 2020.55578 -90.57 1.89 45.49 1.74 -12.09 6.82 earthquake 7.8 at00qdux98 154.2
2020-10-19 2020.79945 194.14 13.47 -170.55 13.37 -49.22 37.78 earthquake 7.6 us6000c9hg 152.5
2021-07-29 2021.57221 -39.46 1.81 77.84 1.69 -7.63 6.28 earthquake 8.2 ak0219neiszm 174.3
2023-07-16 2023.53662 -8.06 0.52 -0.13 0.49 0.37 1.67 earthquake 7.2 us7000kg30 162.8

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)
2020-07-22 2020.55578 -13.37 0.73 0.0001 11.68 0.68 0.0001 -1.19 2.6 0.0001
2020-10-19 2020.79945 -53.15 3.53 0.0001 44.73 3.5 0.0001 12.83 9.96 0.0001
2021-07-28 2021.57221 -3.98 0.73 0.0001 7.05 0.69 0.0001 0.75 2.43 0.0001

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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