Polarization anomalies at GLISN stations


The table below shows the results from a polarization analysis of long-period surface waves recorded on GLISN stations estimated using the method described by Ekström and Busby (SRL, 2008). The horizontal components have been rotated to maximize the correlation between observed and predicted seismograms for recent earthquakes, and the table shows the median (aqua blue) of the rotation angles, as well as the range (navy blue) for the second and third quartiles of the distribution of angles.

Large (5 degrees or more) anomalies are unlikely to be caused by wave-propagation effects, and are more likely the result of station misorientation.

The table below gives the channel name and stated orientation for the horizontal components, the wave type (Surface-wave or Mantle-wave), a response epoch identifier, the times of the first and last observations used, the total number of observations, and the number of polarization measurements used in the estimate of the sensor orientation. Estimates based on fewer than 5 measurements are less reliable. The orientation anomaly is measured against the reported orientation (Azim). A positive value for the anomaly reflects a counter-clockwise rotation of the sensor compared to the reported value. The 0000 epoch identifier refers to all data available for the station.


Ranked listing of the polarization results ; Ascii file with the data

Alphabetical listing of the polarization results ; Ascii file with the data



II DK GE CN -G IU

Arrival-angle anomaly
Station Chan Azim T Epoch min time max time # obs. # used 180-26 25-21 20-16 15-11 10-8 7-5 4-2 1-1 2-4 5-7 8-10 11-15 16-20 21-25 26-180
BORG-II LHE-10 LHN-10 90.6 S 0001 2009.003 2011.261 150 17 x x x x x x -2 x x x x x x x x
ALE-II LHE-10 LHN-10 90.0 S 0001 2009.003 2012.085 148 43 x x x x x x x -1 x x x x x x x
ALE-II LHE-00 LHN-00 90.0 S 0005 2009.003 2012.085 152 45 x x x x x x x -1 x x x x x x x
BORG-II LH1-00 LH2-00 225.2 S 0003 2011.287 2013.175 79 13 x x x x x x x 0 x x x x x x x
BORG-II LH1-00 LH2-00 225.2 S 0002 2009.003 2011.261 150 29 x x x x x x x 0 x x x x x x x
BORG-II LH1-10 LH2-10 358.8 S 0001 2011.287 2012.108 27 6 x x x x x x x 0 x x x x x x x
BORG-II LH1-10 LH2-10 358.9 S 0004 2012.208 2013.175 49 6 x x x x x x x 1 x x x x x x x
BORG-II LH1-10 LH2-10 359.9 S 0002 2012.112 2012.149 3 0 x x x x x x x x x x x x x x x

Arrival-angle anomaly
Station Chan Azim T Epoch min time max time # obs. # used 180-26 25-21 20-16 15-11 10-8 7-5 4-2 1-1 2-4 5-7 8-10 11-15 16-20 21-25 26-180
DY2G-DK LH1-00 LH2-00 270.0 S 0003 2013.030 2013.175 28 8 x -23 x x x x x x x x x x x x x
NEEM-DK LH1-10 LH2-10 0.0 S 0003 2013.030 2013.175 28 4 x x x x -9 x x x x x x x x x x
SOEG-DK LH1-00 LH2-00 29.5 S 0001 2013.005 2013.175 29 4 x x x x -8 x x x x x x x x x x
DBG-DK LH1-00 LH2-00 0.0 S 0001 2013.030 2013.175 28 4 x x x x x -7 x x x x x x x x x
ICESG-DK LH1-00 LH2-00 0.0 S 0001 2013.005 2013.175 29 4 x x x x x -7 x x x x x x x x x
ICESG-DK LHE LHN 90.0 S 0001 2011.171 2012.356 72 14 x x x x x x -4 x x x x x x x x
ANGG-DK LHE LHN 97.5 S 0001 2010.222 2011.294 65 5 x x x x x x -3 x x x x x x x x
SCO-DK LHE LHN 90.0 S 0002 2012.208 2013.175 50 7 x x x x x x -3 x x x x x x x x
SCO-DK LHE LHN 90.0 S 0001 2010.222 2012.149 93 16 x x x x x x x -1 x x x x x x x
KULLO-DK LHE LHN 90.0 S 0001 2009.240 2013.175 201 44 x x x x x x x -1 x x x x x x x
NUUK-DK LHE LHN 90.0 S 0001 2010.216 2013.175 145 23 x x x x x x x 0 x x x x x x x
NEEM-DK LHE-02 LHN-02 90.0 S 0001 2011.210 2012.149 45 2 x x x x x x x 0 x x x x x x x
DY2G-DK LHE-02 LHN-02 90.0 S 0001 2011.232 2012.149 43 9 x x x x x x x 0 x x x x x x x
NOR-DK LHE LHN 90.0 S 0001 2010.195 2013.175 147 26 x x x x x x x 0 x x x x x x x
NUUG-DK LHE LHN 90.0 S 0001 2010.204 2013.175 150 27 x x x x x x x 0 x x x x x x x
NRS-DK LHE LHN 90.0 S 0001 2010.204 2013.175 147 23 x x x x x x x 1 x x x x x x x
DY2G-DK LH1-10 LH2-10 0.0 S 0002 2013.005 2013.175 29 9 x x x x x x x 1 x x x x x x x
DBG-DK LHE LHN 90.0 S 0001 2010.224 2013.005 100 17 x x x x x x x x 2 x x x x x x
ANGG-DK LHE LHN 327.5 S 0002 2011.296 2012.119 27 3 x x x x x x x x 2 x x x x x x
SOEG-DK LH1 LH2 29.5 S 0001 2011.212 2012.356 64 8 x x x x x x x x 3 x x x x x x
ILULI-DK LHE LHN 90.0 S 0001 2009.240 2013.175 206 35 x x x x x x x x 3 x x x x x x
DY2G-DK LHE-02 LHN-02 90.0 S 0002 2012.224 2012.356 19 4 x x x x x x x x 3 x x x x x x
ISOG-DK LHE LHN 90.0 S 0001 2012.270 2013.175 38 3 x x x x x x x x 4 x x x x x x
TULEG-DK LHE LHN 90.0 S 0002 2011.130 2013.175 99 17 x x x x x x x x x 5 x x x x x
TULEG-DK LHE LHN 90.0 S 0001 2010.125 2011.113 56 3 x x x x x x x x x 7 x x x x x
NEEM-DK LHE-02 LHN-02 90.0 S 0002 2012.208 2012.356 21 2 x x x x x x x x x x 8 x x x x
ANGG-DK LHE LHN 97.5 S 0003 2012.149 2013.175 49 5 x x x x x x x x x x x 11 x x x
NEEM-DK LH1-10 LH2-10 0.0 S 0002 2013.005 2013.005 1 0 x x x x x x x x x x x x x x x
NEEM-DK LH1-01 LH2-01 180.0 S 0002 2012.208 2012.356 21 0 x x x x x x x x x x x x x x x
NEEM-DK LH1-01 LH2-01 180.0 S 0001 2011.210 2012.149 45 0 x x x x x x x x x x x x x x x
NEEM-DK LH1-00 LH2-00 180.0 S 0003 2013.030 2013.175 28 0 x x x x x x x x x x x x x x x
NEEM-DK LH1-00 LH2-00 180.0 S 0002 2013.005 2013.005 1 0 x x x x x x x x x x x x x x x
DY2G-DK LH1-01 LH2-01 0.0 S 0002 2012.224 2012.356 19 0 x x x x x x x x x x x x x x x
DY2G-DK LH1-01 LH2-01 0.0 S 0001 2011.232 2012.149 43 0 x x x x x x x x x x x x x x x
DY2G-DK LH1-00 LH2-00 270.0 S 0002 2013.005 2013.005 1 0 x x x x x x x x x x x x x x x

Arrival-angle anomaly
Station Chan Azim T Epoch min time max time # obs. # used 180-26 25-21 20-16 15-11 10-8 7-5 4-2 1-1 2-4 5-7 8-10 11-15 16-20 21-25 26-180
SUMG-GE LHE LHN 90.0 S 0005 2012.208 2013.175 45 9 x x x x x -6 x x x x x x x x x
SUMG-GE LHE LHN 90.0 S 0003 2009.003 2010.195 77 3 x x x x x x -3 x x x x x x x x
SUMG-GE LHE LHN 90.0 S 0004 2010.204 2012.149 97 12 x x x x x x -3 x x x x x x x x
DAG-GE LHE LHN 90.0 S 0005 2010.049 2013.175 166 21 x x x x x x x 0 x x x x x x x
DAG-GE LHE LHN 90.0 S 0004 2009.003 2010.012 49 9 x x x x x x x 1 x x x x x x x

Arrival-angle anomaly
Station Chan Azim T Epoch min time max time # obs. # used 180-26 25-21 20-16 15-11 10-8 7-5 4-2 1-1 2-4 5-7 8-10 11-15 16-20 21-25 26-180
EUNU-CN BHE BHN 90.0 S 0001 2009.136 2013.113 150 1 -27 x x x x x x x x x x x x x x
FRB-CN LHE LHN 90.0 S 0001 2009.003 2013.060 207 33 x x x x x x x x 2 x x x x x x
RES-CN LHE LHN 90.0 S 0001 2009.003 2013.060 204 0 x x x x x x x x x x x x x x x

Arrival-angle anomaly
Station Chan Azim T Epoch min time max time # obs. # used 180-26 25-21 20-16 15-11 10-8 7-5 4-2 1-1 2-4 5-7 8-10 11-15 16-20 21-25 26-180
IVI-G LHE-00 LHN-00 90.0 S 0001 2011.287 2013.175 80 15 x x x x x x -2 x x x x x x x x

Arrival-angle anomaly
Station Chan Azim T Epoch min time max time # obs. # used 180-26 25-21 20-16 15-11 10-8 7-5 4-2 1-1 2-4 5-7 8-10 11-15 16-20 21-25 26-180
KBS-IU LHE-10 LHN-10 90.0 S 0001 2009.003 2009.245 27 11 x x x x x -7 x x x x x x x x x
SFJD-IU LH1-00 LH2-00 19.0 S 0001 2010.003 2013.175 186 23 x x x x x x -3 x x x x x x x x
SFJD-IU LH1-10 LH2-10 0.0 S 0001 2010.003 2013.175 186 38 x x x x x x x 0 x x x x x x x
SFJD-IU LHE-10 LHN-10 90.0 S 0002 2009.003 2009.328 44 9 x x x x x x x 1 x x x x x x x
SFJD-IU LHE-00 LHN-00 109.0 S 0002 2009.003 2009.328 44 3 x x x x x x x 1 x x x x x x x
KBS-IU LH1-10 LH2-10 10.0 S 0002 2011.038 2013.175 124 19 x x x x x x x 1 x x x x x x x
KBS-IU LH1-00 LH2-00 359.0 S 0001 2010.163 2011.018 34 7 x x x x x x x x 3 x x x x x x
KBS-IU LH1-00 LH2-00 359.0 S 0002 2011.038 2013.175 124 31 x x x x x x x x 3 x x x x x x
KBS-IU LH1-10 LH2-10 10.0 S 0001 2010.163 2011.018 34 6 x x x x x x x x 3 x x x x x x
KBS-IU LHE-10 LHN-10 100.0 S 0002 2009.272 2010.151 45 5 x x x x x x x x 4 x x x x x x
KBS-IU LHE-00 LHN-00 90.0 S 0001 2009.003 2009.245 27 12 x x x x x x x x 4 x x x x x x
KBS-IU LHE-00 LHN-00 89.0 S 0002 2009.272 2010.151 45 6 x x x x x x x x x 7 x x x x x


Created 2014-04-28