Station AC52

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
North3.100.192023-01-30-15.630.472007.7145792007262
East-5.240.212023-01-3038.290.452007.7145792007262
Up1.240.362023-01-30-8.501.382007.7145792007262

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 -0.41 0.49 0.36 0.47 0.28 1.5 earthquake 6.7 ak11610140 128.7
2016-01-24 2016.06297 -1.02 0.49 2.57 0.47 -0.3 1.5 earthquake 7.1 us10004gqp 334.3
2018-01-23 2018.06023 2.78 0.49 -10.92 0.46 -0.52 1.45 earthquake 7.9 us2000cmy3 542
2020-07-22 2020.55578 194.96 5.75 -67.36 5.69 -22.26 15.89 earthquake 7.8 at00qdux98 288.5
2020-10-19 2020.79945 194.96 5.75 -67.36 5.69 -22.26 15.89 earthquake 7.6 us6000c9hg 354
2021-07-29 2021.57221 -84.03 0.62 21.12 0.57 3.78 2.17 earthquake 8.2 ak0219neiszm 250.2

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)
2020-07-23 2020.55578 -104.47 3.11 0.0001 35.65 3.06 0.0001 9.03 8.83 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)
North2007.7145792007262-1.780.100.040.10-0.210.07-0.450.07-0.080.030.100.03
East2007.7145792007262-0.040.09-0.740.090.130.060.720.060.020.03-0.060.03
Up2007.71457920072620.640.300.430.31-0.430.230.300.230.030.11-0.020.11

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-17.400.222023-01-30178.220.942008.6379192008234
East-12.380.242023-01-30114.130.922008.6379192008234
Up1.010.502023-01-30-9.392.842008.6379192008234

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)
2015-05-29 2015.4052 -0.49 0.5 0.5 0.47 0.28 1.55 earthquake 6.7 ak11610140 128.7
2016-01-24 2016.06297 -0.66 0.5 2.22 0.47 -1.11 1.55 earthquake 7.1 us10004gqp 334.3
2018-01-23 2018.06023 2.88 0.5 -11.05 0.47 -0.08 1.51 earthquake 7.9 us2000cmy3 542
2020-07-22 2020.55578 192.91 5.78 -63.31 5.74 -33.26 16.11 earthquake 7.8 at00qdux98 288.5
2020-10-19 2020.79945 192.91 5.78 -63.31 5.74 -33.26 16.11 earthquake 7.6 us6000c9hg 354
2021-07-29 2021.57221 -84.13 0.62 21.16 0.57 3.45 2.18 earthquake 8.2 ak0219neiszm 250.2

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)
2020-07-23 2020.55578 -103.59 3.12 0.0001 30.8 3.09 0.0001 18.62 8.93 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)
North2008.6379192008234-0.710.13-0.520.140.230.09-0.040.09-0.040.04-0.110.04
East2008.63791920082340.380.12-0.580.13-0.500.080.450.090.070.04-0.040.04
Up2008.63791920082340.390.400.530.43-0.170.310.220.310.240.140.090.14

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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