The table below shows the results from polarization analysis of long-period surface waves using the method described by Ekstrom and Busby (SRL, 2008). The horizontal components have been rotated to maximize the correlation between the observed and predicted seismograms for moderate and large earthquakes. The table shows the median (aqua blue) of the rotation angle (the anomaly), as well as the range (navy blue) for the second and third quartiles of the distribution of angles.
The table below gives the channel names and station 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 (Az-1, Az-2). A positive value for the anomaly reflects a counter-clockwise rotation of the sensor compared to the reported value.
Ranked by polarization anomaly
| Station | Channels | T | Epoch | min time | max time | Az-1 | Az-2 | # obs. | # used | -90- -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- 90 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ANMO-IU | LH1-00 LH2-00 | M | 0005 | 2008.238 | 2011.045 | 328.0 | 58.0 | 123 | 62 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| ANMO-IU | LH1-00 LH2-00 | M | 0006 | 2011.052 | 2012.069 | 328.0 | 58.0 | 56 | 26 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-00 LH2-00 | M | 0007 | 2012.074 | 2014.342 | 328.0 | 58.0 | 141 | 62 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-00 LH2-00 | M | 0008 | 2015.007 | 2015.351 | 18.0 | 108.0 | 55 | 28 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | M | 0015 | 2008.238 | 2011.045 | 64.0 | 154.0 | 123 | 42 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | M | 0016 | 2011.052 | 2011.287 | 64.0 | 154.0 | 40 | 15 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | M | 0017 | 2011.294 | 2012.069 | 243.0 | 333.0 | 16 | 5 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | M | 0018 | 2012.074 | 2014.215 | 243.0 | 333.0 | 127 | 35 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | M | 0019 | 2014.236 | 2015.351 | 71.0 | 161.0 | 69 | 25 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| CCM-IU | LH1-00 LH2-00 | M | 0001 | 2011.287 | 2012.149 | 0.0 | 90.0 | 30 | 4 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| CCM-IU | LH1-00 LH2-00 | M | 0002 | 2012.208 | 2015.351 | 0.0 | 90.0 | 181 | 17 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| CCM-IU | LH1-10 LH2-10 | M | 0001 | 2011.287 | 2012.149 | 0.0 | 90.0 | 30 | 2 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| CCM-IU | LH1-10 LH2-10 | M | 0002 | 2012.208 | 2015.351 | 0.0 | 90.0 | 181 | 11 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| CCM-IU | LHN-00 LHE-00 | M | 0001 | 2008.252 | 2010.336 | 0.0 | 90.0 | 13 | 2 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | M | 0001 | 2009.273 | 2011.013 | 1.0 | 91.0 | 77 | 14 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | M | 0002 | 2011.018 | 2012.063 | 1.0 | 91.0 | 61 | 6 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | M | 0003 | 2012.069 | 2012.149 | 1.0 | 91.0 | 14 | 2 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | M | 0004 | 2012.208 | 2014.165 | 1.0 | 91.0 | 104 | 23 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | M | 0005 | 2014.174 | 2014.180 | 1.0 | 91.0 | 6 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | M | 0006 | 2014.188 | 2015.058 | 1.0 | 91.0 | 22 | 2 | x | x | x | x | x | x | x | x | x | 6 | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | M | 0007 | 2015.088 | 2015.351 | 1.0 | 91.0 | 48 | 8 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | M | 0001 | 2009.273 | 2011.013 | 0.0 | 90.0 | 77 | 7 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | M | 0002 | 2011.018 | 2012.063 | 0.0 | 90.0 | 61 | 4 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | M | 0003 | 2012.069 | 2015.058 | 0.0 | 90.0 | 146 | 22 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | M | 0004 | 2015.088 | 2015.351 | 0.0 | 90.0 | 48 | 6 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| COR-IU | LH1-60 LH2-60 | M | 0001 | 2015.088 | 2015.088 | 180.0 | 270.0 | 1 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| COR-IU | LH1-60 LH2-60 | M | 0002 | 2015.107 | 2015.351 | 0.0 | 90.0 | 47 | 6 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| COR-IU | LHN-00 LHE-00 | M | 0002 | 2008.252 | 2009.245 | 1.0 | 91.0 | 38 | 11 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | M | 0001 | 2008.252 | 2009.108 | 30.0 | 120.0 | 24 | 11 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | M | 0002 | 2009.136 | 2010.199 | 30.0 | 120.0 | 67 | 2 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | M | 0003 | 2010.204 | 2010.246 | 129.0 | 219.0 | 12 | 3 | x | x | x | x | x | x | x | x | x | 5 | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | M | 0004 | 2010.272 | 2010.298 | 129.0 | 219.0 | 3 | 3 | x | x | x | x | x | x | x | x | x | 5 | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | M | 0005 | 2010.334 | 2011.083 | 129.0 | 219.0 | 26 | 6 | x | x | x | x | x | x | x | x | 4 | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | M | 0006 | 2011.093 | 2015.351 | 311.0 | 41.0 | 231 | 120 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| DWPF-IU | LH1-10 LH2-10 | M | 0001 | 2010.272 | 2012.149 | 0.0 | 90.0 | 87 | 2 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| DWPF-IU | LH1-10 LH2-10 | M | 0002 | 2012.208 | 2015.351 | 357.0 | 87.0 | 173 | 5 | x | x | x | x | x | x | -4 | x | x | x | x | x | x | x | x |
| HKT-IU | LH1-00 LH2-00 | M | 0001 | 2011.287 | 2012.342 | 358.0 | 89.0 | 41 | 4 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| HKT-IU | LH1-00 LH2-00 | M | 0002 | 2013.045 | 2015.351 | 358.0 | 89.0 | 138 | 2 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HKT-IU | LH1-10 LH2-10 | M | 0001 | 2011.287 | 2015.351 | 0.0 | 90.0 | 181 | 2 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HKT-IU | LHN-00 LHE-00 | M | 0001 | 2008.252 | 2008.255 | 0.0 | 90.0 | 4 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| HKT-IU | LHN-00 LHE-00 | M | 0002 | 2008.273 | 2011.135 | 0.0 | 90.0 | 118 | 10 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| HRV-IU | LH1-00 LH2-00 | M | 0001 | 2011.210 | 2013.335 | 0.0 | 90.0 | 116 | 36 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| HRV-IU | LH1-00 LH2-00 | M | 0003 | 2014.038 | 2015.351 | 0.0 | 90.0 | 106 | 47 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| HRV-IU | LH1-00 LHZ-00 | M | 0008 | 2014.001 | 2014.001 | 0.0 | 90.0 | 1 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| HRV-IU | LH1-10 LH2-10 | M | 0001 | 2011.210 | 2015.351 | 0.0 | 90.0 | 223 | 70 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HRV-IU | LHN-00 LHE-00 | M | 0001 | 2008.290 | 2010.012 | 0.0 | 90.0 | 52 | 21 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HRV-IU | LHN-00 LHE-00 | M | 0002 | 2010.049 | 2010.116 | 0.0 | 90.0 | 17 | 9 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HRV-IU | LHN-00 LHE-00 | M | 0003 | 2010.120 | 2011.192 | 0.0 | 90.0 | 67 | 25 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HRV-IU | LHN-10 LHE-10 | M | 0001 | 2008.290 | 2009.328 | 0.0 | 90.0 | 46 | 17 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| HRV-IU | LHN-10 LHE-10 | M | 0002 | 2010.003 | 2011.192 | 0.0 | 90.0 | 91 | 32 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-00 LH2-00 | M | 0004 | 2008.238 | 2009.245 | 126.0 | 216.0 | 39 | 21 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-00 LH2-00 | M | 0005 | 2009.272 | 2011.192 | 126.0 | 216.0 | 108 | 54 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-00 LH2-00 | M | 0006 | 2011.210 | 2015.351 | 126.0 | 216.0 | 228 | 100 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-10 LH2-10 | M | 0001 | 2009.272 | 2011.192 | 0.0 | 90.0 | 108 | 12 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| RSSD-IU | LH1-10 LH2-10 | M | 0002 | 2011.210 | 2015.351 | 0.0 | 90.0 | 228 | 18 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| RSSD-IU | LHN-10 LHE-10 | M | 0001 | 2008.238 | 2009.245 | 0.0 | 90.0 | 39 | 4 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSPA-IU | LH1-00 LH2-00 | M | 0001 | 2010.294 | 2015.351 | 170.0 | 260.0 | 264 | 49 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| SSPA-IU | LH1-10 LH2-10 | M | 0001 | 2010.294 | 2012.243 | 0.0 | 90.0 | 92 | 2 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| SSPA-IU | LH1-10 LH2-10 | M | 0002 | 2012.244 | 2015.351 | 0.0 | 90.0 | 172 | 2 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| SSPA-IU | LHN-00 LHE-00 | M | 0002 | 2008.252 | 2010.246 | 350.0 | 80.0 | 90 | 21 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| SSPA-IU | LHN-10 LHE-10 | M | 0002 | 2008.252 | 2010.246 | 356.0 | 86.0 | 89 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| TUC-IU | LH1-00 LH2-00 | M | 0001 | 2009.174 | 2010.354 | 1.0 | 91.0 | 81 | 17 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| TUC-IU | LH1-00 LH2-00 | M | 0002 | 2010.355 | 2011.175 | 1.0 | 91.0 | 34 | 8 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| TUC-IU | LH1-00 LH2-00 | M | 0003 | 2011.187 | 2015.351 | 1.0 | 91.0 | 231 | 57 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| TUC-IU | LH1-10 LH2-10 | M | 0001 | 2009.174 | 2010.354 | 359.0 | 89.0 | 81 | 18 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| TUC-IU | LH1-10 LH2-10 | M | 0002 | 2010.355 | 2014.320 | 359.0 | 89.0 | 205 | 42 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| TUC-IU | LH1-10 LH2-10 | M | 0003 | 2014.325 | 2015.351 | 0.0 | 90.0 | 60 | 10 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| TUC-IU | LH1-60 LH2-60 | M | 0001 | 2012.312 | 2015.264 | 0.0 | 90.0 | 151 | 23 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| TUC-IU | LH1-60 LH2-60 | M | 0002 | 2015.267 | 2015.351 | 90.0 | 0.0 | 18 | 2 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| TUC-IU | LHN-00 LHE-00 | M | 0002 | 2007.126 | 2009.148 | 1.0 | 91.0 | 100 | 27 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| WCI-IU | LH1-10 LH2-10 | M | 0001 | 2010.246 | 2015.351 | 0.0 | 90.0 | 273 | 36 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| WCI-IU | LHN-00 LHE-00 | M | 0001 | 2008.252 | 2008.255 | 0.0 | 90.0 | 4 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| WCI-IU | LHN-00 LHE-00 | M | 0002 | 2008.273 | 2010.224 | 0.0 | 90.0 | 95 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| WVT-IU | LH1-00 LH2-00 | M | 0001 | 2011.038 | 2012.149 | 0.0 | 90.0 | 74 | 4 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| WVT-IU | LH1-00 LH2-00 | M | 0002 | 2012.208 | 2015.351 | 0.0 | 90.0 | 182 | 12 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| WVT-IU | LH1-10 LH2-10 | M | 0001 | 2011.038 | 2015.351 | 0.0 | 90.0 | 256 | 9 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| WVT-IU | LHN LHE | M | 0002 | 2008.252 | 2008.255 | 0.0 | 90.0 | 4 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| WVT-IU | LHN LHE | M | 0003 | 2008.273 | 2011.018 | 0.0 | 90.0 | 105 | 9 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |