Station POMM

Last observation

Jan 29, 2022

Closest stations

5 closest stations in all networks

NA-fixed

Plots

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 observation	Intercept (mm)	Intercept standard deviation (mm)	Reference date	Reference year	Reference day of year
North	27.54	0.15	2022-01-28	-368.11	0.50	1999.637919	1999	234
East	-20.78	0.17	2022-01-28	355.53	0.47	1999.637919	1999	234
Up	2.60	0.30	2022-01-28	-40.70	1.61	1999.637919	1999	234

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	-0.82	0.51	-1.74	0.48	3.7	1.64	earthquake	7.1	ci9108652	410.2
2003-12-23	2003.97467	-8.71	1.48	-8.71	1.38	2.17	4.96	earthquake	6.6	nc21323712	61.3
2004-09-28	2004.74196	-12.57	1.69	5.18	1.61	-6.01	5.17	earthquake	6	nc30228270	15.2
2010-04-04	2010.25462	0.11	0.48	-0.4	0.46	-2.17	1.43	earthquake	7.2	ci14607652	625.1
2019-07-06	2019.50924	0.42	0.48	-3.12	0.46	-2.35	1.43	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 noise	Amplitude of BP filtered noise (mm)	n₂ (spectral index of second power law)	Amplitude of second power law (mm/yr^(n₂/4))
North	0.85	1.70	1.00	0.50000	2.00000	1	0.000	2.00	0.50
East	0.84	1.40	1.00	0.50000	2.00000	1	0.000	2.00	0.60
Up	3.20	6.40	1.00	0.50000	2.00000	1	0.000	2.00	0.50

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)
2003-12-22	2003.97467	-0.74	0.51	0.0001	-1.92	0.49	0.0001	-1.66	1.6	0.0001
2004-09-28	2004.74196	16.25	0.57	0.0001	-25.02	0.56	0.0001	4.47	1.64	0.0001

Seasonal

	Reference date	Reference year	Reference day of year	Amplitude of cosine (365.25-day period), mm	Standard deviation of cosine amplitude (365.25-day period)	Amplitude of sine (365.25-day period), mm	Standard deviation of sine amplitude (365.25-day period)	Amplitude of cosine (180.625-day period), mm	Standard deviation of cosine amplitude (180.625-day period)	Amplitude of sine (180.625-day period), mm	Standard deviation of sine amplitude (180.625-day period)	Amplitude of cosine (14.76-day period), mm	Standard deviation of cosine amplitude (14.76-day period)	Amplitude of sine (14.76-day period), mm	Standard deviation of sine amplitude (14.76-day period)	Amplitude of cosine (13.63-day period), mm	Standard deviation of cosine amplitude (13.63-day period)	Amplitude of sine (13.63-day period), mm	Standard deviation of sine amplitude (13.63-day period)
North	1999.637919	1999	234	-0.55	0.07	-0.37	0.07	-0.17	0.05	-0.27	0.05					0.05	0.02	0.03	0.02
East	1999.637919	1999	234	-1.53	0.07	0.06	0.07	-0.08	0.05	-0.25	0.05					0.09	0.02	0.04	0.02
Up	1999.637919	1999	234	1.03	0.23	0.16	0.23	-0.80	0.17	0.53	0.17					-0.11	0.08	-0.31	0.08

ITRF2008

Plots

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 observation	Intercept (mm)	Intercept standard deviation (mm)	Reference date	Reference year	Reference day of year
North	15.96	0.15	2022-01-29	-234.26	0.50	1999.637919	1999	234
East	-33.09	0.17	2022-01-29	500.48	0.47	1999.637919	1999	234
Up	2.49	0.30	2022-01-29	-38.14	1.61	1999.637919	1999	234

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	-0.94	0.51	-2.04	0.48	4.15	1.64	earthquake	7.1	ci9108652	410.2
2003-12-23	2003.97467	-8.4	1.48	-8.69	1.38	0.89	4.96	earthquake	6.6	nc21323712	61.3
2004-09-28	2004.74196	-13.8	1.69	4.26	1.61	-5.02	5.17	earthquake	6	nc30228270	15.2
2010-04-04	2010.25462	0.02	0.48	-1.23	0.46	-2.21	1.43	earthquake	7.2	ci14607652	625.1
2019-07-06	2019.50924	1.26	0.48	-4.45	0.46	-2.08	1.43	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 noise	Amplitude of BP filtered noise (mm)	n₂ (spectral index of second power law)	Amplitude of second power law (mm/yr^(n₂/4))
North	0.85	1.70	1.00	0.50000	2.00000	1	0.000	2.00	0.50
East	0.84	1.40	1.00	0.50000	2.00000	1	0.000	2.00	0.60
Up	3.20	6.40	1.00	0.50000	2.00000	1	0.000	2.00	0.50

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)
2003-12-22	2003.97467	-0.69	0.51	0.0001	-2.06	0.49	0.0001	-1.27	1.6	0.0001
2004-09-28	2004.74196	16.8	0.57	0.0001	-24.74	0.56	0.0001	3.87	1.64	0.0001

Seasonal

	Reference date	Reference year	Reference day of year	Amplitude of cosine (365.25-day period), mm	Standard deviation of cosine amplitude (365.25-day period)	Amplitude of sine (365.25-day period), mm	Standard deviation of sine amplitude (365.25-day period)	Amplitude of cosine (180.625-day period), mm	Standard deviation of cosine amplitude (180.625-day period)	Amplitude of sine (180.625-day period), mm	Standard deviation of sine amplitude (180.625-day period)	Amplitude of cosine (14.76-day period), mm	Standard deviation of cosine amplitude (14.76-day period)	Amplitude of sine (14.76-day period), mm	Standard deviation of sine amplitude (14.76-day period)	Amplitude of cosine (13.63-day period), mm	Standard deviation of cosine amplitude (13.63-day period)	Amplitude of sine (13.63-day period), mm	Standard deviation of sine amplitude (13.63-day period)
North	1999.637919	1999	234	-0.96	0.07	-0.28	0.07	-0.31	0.05	-0.20	0.05					-0.02	0.02	0.07	0.02
East	1999.637919	1999	234	-1.47	0.07	0.17	0.07	-0.07	0.05	-0.33	0.05					0.10	0.02	0.09	0.02
Up	1999.637919	1999	234	1.43	0.23	0.43	0.23	-0.90	0.17	0.53	0.17					-0.11	0.08	-0.29	0.08

Filtered

Plots

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 observation	Intercept (mm)	Intercept standard deviation (mm)	Reference date	Reference year	Reference day of year
North	27.34	0.15	2022-01-29	-364.43	0.56	1999.670773	1999	246
East	-20.72	0.17	2022-01-29	353.75	0.52	1999.670773	1999	246
Up	2.19	0.30	2022-01-29	-39.65	1.83	1999.670773	1999	246

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	5.16	1.79	earthquake	7.1	ci9108652	410.2
2003-12-23	2003.97467	-9.44	1.48	-9.17	1.38	3.89	4.96	earthquake	6.6	nc21323712	61.3
2004-09-28	2004.74196	-13.66	1.69	5.67	1.61	-8.58	5.17	earthquake	6	nc30228270	15.2
2010-04-04	2010.25462	-0.19	0.48	-0.41	0.46	-1.21	1.43	earthquake	7.2	ci14607652	625.1
2019-07-06	2019.50924	0.34	0.48	-1.4	0.46	-0.72	1.43	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 noise	Amplitude of BP filtered noise (mm)	n₂ (spectral index of second power law)	Amplitude of second power law (mm/yr^(n₂/4))
North	0.85	1.70	1.00	0.50000	2.00000	1	0.000	2.00	0.50
East	0.84	1.40	1.00	0.50000	2.00000	1	0.000	2.00	0.60
Up	3.20	6.40	1.00	0.50000	2.00000	1	0.000	2.00	0.50

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)
2003-12-22	2003.97467	-0.3	0.51	0.0001	-1.52	0.49	0.0001	-2.48	1.6	0.0001
2004-09-28	2004.74196	16.42	0.57	0.0001	-25.3	0.56	0.0001	6.29	1.64	0.0001

Seasonal

	Reference date	Reference year	Reference day of year	Amplitude of cosine (365.25-day period), mm	Standard deviation of cosine amplitude (365.25-day period)	Amplitude of sine (365.25-day period), mm	Standard deviation of sine amplitude (365.25-day period)	Amplitude of cosine (180.625-day period), mm	Standard deviation of cosine amplitude (180.625-day period)	Amplitude of sine (180.625-day period), mm	Standard deviation of sine amplitude (180.625-day period)	Amplitude of cosine (14.76-day period), mm	Standard deviation of cosine amplitude (14.76-day period)	Amplitude of sine (14.76-day period), mm	Standard deviation of sine amplitude (14.76-day period)	Amplitude of cosine (13.63-day period), mm	Standard deviation of cosine amplitude (13.63-day period)	Amplitude of sine (13.63-day period), mm	Standard deviation of sine amplitude (13.63-day period)
North	1999.670773	1999	246	0.39	0.07	-0.31	0.07	-0.29	0.05	-0.12	0.05					0.00	0.02	0.01	0.02
East	1999.670773	1999	246	-0.86	0.07	-0.26	0.07	-0.03	0.05	-0.08	0.05					-0.01	0.02	0.01	0.02
Up	1999.670773	1999	246	-0.03	0.23	-0.37	0.23	-0.18	0.17	0.09	0.17					0.04	0.08	0.00	0.08

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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