Station SILK

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	24.51	0.17	2022-01-28	-283.02	6.35	2000.361396	2000	133
East	-25.94	0.16	2022-01-28	277.63	6.14	2000.361396	2000	133
Up	-0.20	0.91	2022-01-28	-6.80	31.89	2000.361396	2000	133

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)
2003-12-23	2003.97467	0.62	0.54	-0.38	0.54	0.5	1.86	earthquake	6.6	nc21323712	314.1
2007-04-01	2007.24641	-4.71	0.52	-2.3	0.51	-1.46	1.81	other
2010-04-04	2010.25462	-0.44	0.53	-1.67	0.53	1.86	1.86	earthquake	7.2	ci14607652	342.3
2013-03-15	2013.19986	9.91	1.01	8.93	0.96	-0.59	4.97	antenna
2019-07-04	2019.50376	0.75	1.26	1.2	1.32	-0.27	4.26	earthquake	6.4	ci38443183	190.8
2019-07-06	2019.50924	1.76	1.73	-3.16	1.79	0.93	6.13	earthquake	7.1	ci38457511	194.1

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	0.56	2.84	1.00	0.50000	2.00000	2	0.157	2.00	0.09
East	0.65	2.77	1.00	0.50000	2.00000	2	0.219	2.00	0.06
Up	2.49	6.81	1.00	0.50000	2.00000	1	0.000	2.00	2.19

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)
1999-10-16	1999.79124	0.93	1.59	0.0001	2.14	1.53	0.0001	1.59	8.29	0.0001
2019-07-05	2019.50924	1.09	0.49	0.0001	1.08	0.48	0.0001	0.27	1.87	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	2000.361396	2000	133	0.19	0.12	-0.86	0.12	0.02	0.09	-0.07	0.09					-0.03	0.02	-0.07	0.02
East	2000.361396	2000	133	-0.62	0.13	-1.07	0.13	0.01	0.10	0.25	0.10					-0.05	0.02	-0.10	0.02
Up	2000.361396	2000	133	0.10	0.31	-0.66	0.31	1.25	0.21	-0.55	0.21					-0.19	0.08	0.33	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	13.42	0.19	2022-01-29	-174.92	7.16	2000.361396	2000	133
East	-38.12	0.18	2022-01-29	416.98	6.88	2000.361396	2000	133
Up	-0.42	0.77	2022-01-29	-1.99	27.78	2000.361396	2000	133

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)
2003-12-23	2003.97467	1.03	0.64	-0.68	0.62	0.39	1.88	earthquake	6.6	nc21323712	314.1
2007-04-01	2007.24641	-4.42	0.6	-2.21	0.59	-0.82	1.83	other
2010-04-04	2010.25462	-0.17	0.63	-2.69	0.61	1.97	1.87	earthquake	7.2	ci14607652	342.3
2013-03-15	2013.19986	10.84	1.21	9.98	1.09	-0.22	4.39	antenna
2019-07-04	2019.50376	2.48	1.42	1.87	1.45	-3.05	4.39	earthquake	6.4	ci38443183	190.8
2019-07-06	2019.50924	1.44	1.99	-2.88	1.99	2.5	6.19	earthquake	7.1	ci38457511	194.1

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	0.49	3.81	1.00	0.50000	2.00000	1	0.000	2.00	0.00
East	0.63	3.39	1.00	0.50000	2.00000	2	0.260	2.00	0.01
Up	2.35	8.13	1.00	0.50000	2.00000	1	0.000	2.00	1.45

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)
1999-10-16	1999.79124	3.99	1.79	0.0001	1.8	1.71	0.0001	1.19	7.16	0.0001
2019-07-05	2019.50924	0.9	0.58	0.0001	0.45	0.55	0.0001	0.86	1.82	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	2000.361396	2000	133	0.19	0.12	-1.32	0.12	0.19	0.08	-0.05	0.08					0.06	0.03	-0.05	0.03
East	2000.361396	2000	133	-0.71	0.15	-1.04	0.15	-0.03	0.12	0.33	0.12					-0.02	0.03	-0.14	0.03
Up	2000.361396	2000	133	-0.25	0.32	-0.27	0.32	1.31	0.22	-0.54	0.22					-0.17	0.08	0.31	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	24.64	0.23	2022-01-29	-279.65	7.62	2000.361396	2000	133
East	-26.08	0.15	2022-01-29	278.75	5.30	2000.361396	2000	133
Up	0.33	0.70	2022-01-29	8.89	23.14	2000.361396	2000	133

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)
2003-12-23	2003.97467	0.28	0.34	-0.08	0.29	-0.24	1.16	earthquake	6.6	nc21323712	314.1
2007-04-01	2007.24641	-3.71	0.33	-1.55	0.29	-1.09	1.14	other
2010-04-04	2010.25462	0.03	0.34	-0.34	0.3	0.52	1.16	earthquake	7.2	ci14607652	342.3
2013-03-15	2013.19986	10.57	1.16	9.44	0.82	-7.89	3.47	antenna
2019-07-04	2019.50376	-1	0.84	0.17	0.78	0.02	3.5	earthquake	6.4	ci38443183	190.8
2019-07-06	2019.50924	1.77	1.22	-2.45	1.07	2.54	4.71	earthquake	7.1	ci38457511	194.1

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	0.64	0.69	1.00	0.50000	2.00000	1	0.000	2.00	0.71
East	0.55	0.87	1.00	0.50000	2.00000	4	0.140	2.00	0.41
Up	2.92	1.99	1.00	0.50000	2.00000	1	0.000	2.00	2.11

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)
1999-10-16	1999.79124	0.1	2	0.0001	2.19	1.38	0.0001	-2	6.05	0.0001
2019-07-05	2019.50924	0.58	0.37	0.0001	1.08	0.3	0.0001	-0.54	1.25	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	2000.361396	2000	133	-0.10	0.06	-0.03	0.06	0.07	0.04	-0.06	0.04					-0.01	0.01	-0.01	0.01
East	2000.361396	2000	133	-0.13	0.07	-0.32	0.07	-0.03	0.04	0.11	0.04					-0.03	0.01	-0.05	0.01
Up	2000.361396	2000	133	0.19	0.18	-0.99	0.18	0.38	0.12	-0.13	0.11					-0.02	0.06	0.09	0.06

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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