Station POMM

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
North27.620.162021-05-20-359.630.501999.6379191999234
East-20.970.172021-05-20349.480.471999.6379191999234
Up2.710.322021-05-20-40.131.621999.6379191999234

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)
1999-10-16 1999.7885 -0.86 0.51 -1.74 0.48 3.71 1.64 earthquake 7.1 ci9108652 410.2
2003-12-23 2003.97467 -9.82 1.07 -10.46 1 1.84 3.78 earthquake 6.6 nc21323712 61.3
2004-09-28 2004.74196 -9.17 1.58 -0.01 1.51 -4.66 4.91 earthquake 6 nc30228270 15.2
2010-04-04 2010.25462 0.12 0.49 -0.39 0.46 -2.29 1.44 earthquake 7.2 ci14607652 625.1
2018-05-27 2018.39973 0.12 0.48 0.17 0.45 -0.57 1.43 Reference Frame Change: IGb08 to IGS14
2019-07-06 2019.50924 2.79 1.41 0.22 1.33 -6.88 4.54 earthquake 7.1 ci38457511 260.1

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)
2003-12-24 2003.97741 -0.36 0.37 0.0001 -1.32 0.35 0.0001 -1.62 1.22 0.0001
2004-09-30 2004.7447 15.22 0.54 0.0001 -23.56 0.52 0.0001 4.05 1.55 0.0001
2019-07-06 2019.50924 -0.86 0.48 0.0001 -1.22 0.47 0.0001 1.53 1.4 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 (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)
North1999.6379191999234-0.550.08-0.340.08-0.180.05-0.260.050.060.020.020.02
East1999.6379191999234-1.570.070.080.07-0.100.05-0.220.050.090.020.040.02
Up1999.63791919992341.100.240.240.23-0.770.170.520.18-0.120.08-0.330.08

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

Velocities

Velocity (mm/yr)Velocity standard deviation (mm/yr)Last observationIntercept (mm)Intercept standard deviation (mm)Reference dateReference yearReference day of year
North16.220.162021-06-01-229.560.501999.6379191999234
East-33.140.172021-06-01491.990.471999.6379191999234
Up2.410.322021-06-01-37.481.621999.6379191999234

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)
1999-10-16 1999.7885 -1.01 0.51 -2.09 0.48 4.29 1.64 earthquake 7.1 ci9108652 410.2
2003-12-23 2003.97467 -9.56 1.07 -10.55 1 0.54 3.78 earthquake 6.6 nc21323712 61.3
2004-09-28 2004.74196 -9.82 1.58 -0.71 1.51 -4.62 4.91 earthquake 6 nc30228270 15.2
2010-04-04 2010.25462 -0.09 0.48 -1.29 0.46 -2.06 1.44 earthquake 7.2 ci14607652 625.1
2018-05-27 2018.39973 -3.52 0.48 -0.35 0.45 -0.02 1.43 Reference Frame Change: IGb08 to IGS14
2019-07-06 2019.50924 3.52 1.41 0.99 1.33 -6.47 4.53 earthquake 7.1 ci38457511 260.1

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)
2003-12-24 2003.97741 -0.31 0.37 0.0001 -1.44 0.35 0.0001 -1.16 1.22 0.0001
2004-09-30 2004.7447 15.55 0.54 0.0001 -23.39 0.52 0.0001 3.81 1.55 0.0001
2019-07-06 2019.50924 -0.8 0.48 0.0001 -1.99 0.47 0.0001 1.4 1.4 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 (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)
North1999.6379191999234-0.920.08-0.250.08-0.310.05-0.210.05-0.020.020.070.02
East1999.6379191999234-1.500.070.210.07-0.120.05-0.320.050.100.020.080.02
Up1999.63791919992341.470.240.460.23-0.860.170.570.18-0.130.08-0.290.08

Filtered

Plots

Plot showing Filtered 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
North27.450.162021-06-01-356.670.561999.6707731999246
East-20.900.172021-06-01348.270.521999.6707731999246
Up2.100.322021-06-01-38.911.831999.6707731999246

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)
1999-10-16 1999.7885 -1.25 0.54 -0.95 0.5 5.2 1.8 earthquake 7.1 ci9108652 410.2
2003-12-23 2003.97467 -9.95 1.07 -10.89 1 1.36 3.78 earthquake 6.6 nc21323712 61.3
2004-09-28 2004.74196 -10.13 1.58 0.54 1.51 -7.16 4.91 earthquake 6 nc30228270 15.2
2010-04-04 2010.25462 -0.21 0.49 -0.4 0.46 -1.08 1.44 earthquake 7.2 ci14607652 625.1
2018-05-27 2018.39973 0.13 0.48 0.07 0.45 0.83 1.43 Reference Frame Change: IGb08 to IGS14
2019-07-06 2019.50924 0.93 1.41 1.92 1.33 -1.91 4.53 earthquake 7.1 ci38457511 260.1

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)
2003-12-24 2003.97741 -0.12 0.37 0.0001 -0.92 0.35 0.0001 -1.67 1.22 0.0001
2004-09-30 2004.7447 15.39 0.54 0.0001 -23.86 0.52 0.0001 5.83 1.55 0.0001
2019-07-06 2019.50924 -0.22 0.48 0.0001 -1.21 0.47 0.0001 0.36 1.4 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 (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)
North1999.67077319992460.430.08-0.320.08-0.280.05-0.130.050.000.020.020.02
East1999.6707731999246-0.880.07-0.260.07-0.040.05-0.070.05-0.010.020.010.02
Up1999.6707731999246-0.060.24-0.390.24-0.150.170.060.180.040.080.010.08

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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