Station TWRI

Last observation

Jan 21, 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	3.07	0.17	2022-01-21	-30.26	0.48	2004.76386	2004	280
East	6.08	0.19	2022-01-21	100.39	0.45	2004.76386	2004	280
Up	-1.29	0.35	2022-01-21	-30.47	1.41	2004.76386	2004	280

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)
2005-06-15	2005.45175	-0.27	0.49	1.55	0.46	-4.79	1.47	earthquake	7.2	usp000dt25	622.5
2008-09-30	2008.74743	2.86	0.71	3.33	0.7	-2.33	1.86	antenna
2011-09-07	2011.68172	-8.95	0.51	-1.1	0.48	38.93	1.62	antenna
2012-08-02	2012.5859	27.29	0.84	-302.92	0.83	56.64	2.19	antenna
2018-07-18	2018.54209	-1.75	0.62	-2.49	0.59	-3.45	1.75	antenna

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

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	2004.76386	2004	280	2.56	0.11	-1.09	0.10	0.13	0.08	0.87	0.07					0.05	0.03	-0.11	0.03
East	2004.76386	2004	280	-0.67	0.10	1.05	0.10	-0.39	0.07	0.25	0.07					-0.10	0.03	-0.12	0.03
Up	2004.76386	2004	280	4.04	0.34	5.18	0.33	-0.53	0.25	-1.66	0.25					-0.26	0.12	0.96	0.12

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	-8.89	0.17	2022-01-21	64.02	0.48	2004.76386	2004	280
East	-8.05	0.19	2022-01-21	209.14	0.45	2004.76386	2004	280
Up	-1.32	0.35	2022-01-21	-28.55	1.41	2004.76386	2004	280

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)
2005-06-15	2005.45175	-0.44	0.49	1.8	0.46	-5.9	1.47	earthquake	7.2	usp000dt25	622.5
2008-09-30	2008.74743	3.3	0.71	3.43	0.7	-2.86	1.86	antenna
2011-09-07	2011.68172	-9.54	0.51	-0.9	0.48	40.52	1.65	antenna
2012-08-02	2012.5859	28.16	0.84	-303.36	0.83	54.95	2.2	antenna
2018-07-18	2018.54209	-3.51	0.62	-3.51	0.59	-3.46	1.75	antenna

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	2004.76386	2004	280	2.27	0.11	-0.73	0.10	0.27	0.08	1.05	0.07					0.13	0.03	-0.05	0.03
East	2004.76386	2004	280	-0.44	0.10	0.62	0.10	-0.24	0.07	0.44	0.07					-0.03	0.03	-0.09	0.03
Up	2004.76386	2004	280	4.84	0.34	5.11	0.33	-0.68	0.25	-1.62	0.25					-0.27	0.12	1.04	0.12

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	3.06	0.17	2022-01-21	-30.62	0.48	2004.76386	2004	280
East	6.04	0.19	2022-01-21	99.28	0.45	2004.76386	2004	280
Up	-1.07	0.35	2022-01-21	-30.77	1.41	2004.76386	2004	280

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)
2005-06-15	2005.45175	0.2	0.49	1.72	0.47	-3.96	1.47	earthquake	7.2	usp000dt25	622.5
2008-09-30	2008.74743	1.94	0.71	2.79	0.7	-2.75	1.86	antenna
2011-09-07	2011.68172	-8.43	0.51	-0.56	0.48	38.24	1.65	antenna
2012-08-02	2012.5859	26.95	0.84	-303.74	0.83	54.95	2.2	antenna
2018-07-18	2018.54209	-2.09	0.64	-2.5	0.61	1.11	1.79	antenna

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	2004.76386	2004	280	3.10	0.11	-1.28	0.10	0.25	0.08	0.72	0.07					0.05	0.03	-0.10	0.03
East	2004.76386	2004	280	-0.30	0.10	-0.16	0.10	-0.01	0.07	0.35	0.07					0.03	0.03	-0.03	0.03
Up	2004.76386	2004	280	0.91	0.34	4.59	0.33	-1.12	0.26	-0.86	0.25					-0.11	0.12	0.42	0.12

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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