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 | S | 0003 | 2008.169 | 2008.169 | 328.0 | 58.0 | 1 | 1 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-00 LH2-00 | S | 0005 | 2008.222 | 2011.046 | 328.0 | 58.0 | 772 | 293 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-00 LH2-00 | S | 0006 | 2011.051 | 2012.072 | 328.0 | 58.0 | 384 | 149 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-00 LH2-00 | S | 0007 | 2012.074 | 2014.351 | 328.0 | 58.0 | 811 | 252 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-00 LH2-00 | S | 0008 | 2014.354 | 2015.365 | 18.0 | 108.0 | 289 | 96 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | S | 0013 | 2008.169 | 2008.169 | 64.0 | 154.0 | 1 | 1 | x | x | x | x | x | -6 | x | x | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | S | 0015 | 2008.222 | 2011.046 | 64.0 | 154.0 | 771 | 226 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | S | 0016 | 2011.051 | 2011.287 | 64.0 | 154.0 | 279 | 85 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | S | 0017 | 2011.291 | 2012.072 | 243.0 | 333.0 | 105 | 25 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | S | 0018 | 2012.074 | 2014.222 | 243.0 | 333.0 | 729 | 167 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| ANMO-IU | LH1-10 LH2-10 | S | 0019 | 2014.230 | 2015.365 | 71.0 | 161.0 | 371 | 112 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| CCM-IU | LH1-00 LH2-00 | S | 0001 | 2011.279 | 2012.163 | 0.0 | 90.0 | 201 | 20 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| CCM-IU | LH1-00 LH2-00 | S | 0002 | 2012.167 | 2015.365 | 0.0 | 90.0 | 994 | 140 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| CCM-IU | LH1-10 LH2-10 | S | 0001 | 2011.279 | 2012.163 | 0.0 | 90.0 | 201 | 19 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| CCM-IU | LH1-10 LH2-10 | S | 0002 | 2012.167 | 2015.365 | 0.0 | 90.0 | 994 | 138 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| CCM-IU | LHN-00 LHE-00 | S | 0001 | 2008.241 | 2011.144 | 0.0 | 90.0 | 138 | 21 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | S | 0001 | 2009.273 | 2011.013 | 1.0 | 91.0 | 413 | 78 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | S | 0002 | 2011.015 | 2012.067 | 1.0 | 91.0 | 415 | 61 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | S | 0003 | 2012.068 | 2012.184 | 1.0 | 91.0 | 102 | 18 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | S | 0004 | 2012.185 | 2014.171 | 1.0 | 91.0 | 582 | 81 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | S | 0005 | 2014.174 | 2014.187 | 1.0 | 91.0 | 23 | 4 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | S | 0006 | 2014.188 | 2015.082 | 1.0 | 91.0 | 154 | 25 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-00 LH2-00 | S | 0007 | 2015.087 | 2015.365 | 1.0 | 91.0 | 234 | 46 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | S | 0001 | 2009.273 | 2011.013 | 0.0 | 90.0 | 413 | 78 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | S | 0002 | 2011.015 | 2012.067 | 0.0 | 90.0 | 415 | 63 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | S | 0003 | 2012.068 | 2015.082 | 0.0 | 90.0 | 861 | 139 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| COR-IU | LH1-10 LH2-10 | S | 0004 | 2015.087 | 2015.365 | 0.0 | 90.0 | 234 | 47 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| COR-IU | LH1-60 LH2-60 | S | 0001 | 2015.087 | 2015.090 | 180.0 | 270.0 | 11 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| COR-IU | LH1-60 LH2-60 | S | 0002 | 2015.092 | 2015.365 | 0.0 | 90.0 | 223 | 46 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| COR-IU | LHN-00 LHE-00 | S | 0002 | 2008.169 | 2009.267 | 1.0 | 91.0 | 301 | 65 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | S | 0001 | 2008.169 | 2009.109 | 30.0 | 120.0 | 203 | 32 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | S | 0002 | 2009.111 | 2010.199 | 30.0 | 120.0 | 381 | 3 | x | x | x | x | x | -6 | x | x | x | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | S | 0003 | 2010.200 | 2010.265 | 129.0 | 219.0 | 49 | 5 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | S | 0004 | 2010.272 | 2010.309 | 129.0 | 219.0 | 31 | 6 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | S | 0005 | 2010.314 | 2011.091 | 129.0 | 219.0 | 166 | 17 | x | x | x | x | x | x | x | x | x | 6 | x | x | x | x | x |
| DWPF-IU | LH1-00 LH2-00 | S | 0006 | 2011.092 | 2015.365 | 311.0 | 41.0 | 1349 | 232 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| DWPF-IU | LH1-10 LH2-10 | S | 0001 | 2010.272 | 2012.176 | 0.0 | 90.0 | 585 | 18 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| DWPF-IU | LH1-10 LH2-10 | S | 0002 | 2012.179 | 2015.365 | 357.0 | 87.0 | 960 | 60 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HKT-IU | LH1-00 LH2-00 | S | 0001 | 2011.279 | 2013.042 | 358.0 | 89.0 | 288 | 8 | x | x | x | x | x | -5 | x | x | x | x | x | x | x | x | x |
| HKT-IU | LH1-00 LH2-00 | S | 0002 | 2013.045 | 2015.365 | 358.0 | 89.0 | 751 | 17 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| HKT-IU | LH1-10 LH2-10 | S | 0001 | 2011.277 | 2015.365 | 0.0 | 90.0 | 1056 | 36 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HKT-IU | LHN-00 LHE-00 | S | 0001 | 2008.169 | 2008.255 | 0.0 | 90.0 | 21 | 1 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| HKT-IU | LHN-00 LHE-00 | S | 0002 | 2008.268 | 2011.165 | 0.0 | 90.0 | 779 | 46 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| HRV-IU | LH1-00 LH2-00 | S | 0001 | 2011.207 | 2013.351 | 0.0 | 90.0 | 687 | 154 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HRV-IU | LH1-00 LH2-00 | S | 0003 | 2014.020 | 2015.365 | 0.0 | 90.0 | 569 | 129 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| HRV-IU | LH1-00 LHZ-00 | S | 0008 | 2013.357 | 2014.013 | 0.0 | 90.0 | 12 | 3 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| HRV-IU | LH1-10 LH2-10 | S | 0001 | 2011.207 | 2015.365 | 0.0 | 90.0 | 1268 | 306 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| HRV-IU | LHN-00 LHE-00 | S | 0001 | 2008.283 | 2010.046 | 0.0 | 90.0 | 379 | 92 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| HRV-IU | LHN-00 LHE-00 | S | 0002 | 2010.048 | 2010.119 | 0.0 | 90.0 | 80 | 8 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| HRV-IU | LHN-00 LHE-00 | S | 0003 | 2010.120 | 2011.201 | 0.0 | 90.0 | 419 | 100 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| HRV-IU | LHN-00 LHE-00 | S | 0004 | 2011.202 | 2011.206 | 0.0 | 90.0 | 7 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| HRV-IU | LHN-10 LHE-10 | S | 0001 | 2008.283 | 2009.348 | 0.0 | 90.0 | 327 | 79 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HRV-IU | LHN-10 LHE-10 | S | 0002 | 2009.351 | 2011.206 | 0.0 | 90.0 | 558 | 133 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-00 LH2-00 | S | 0004 | 2008.169 | 2009.251 | 126.0 | 216.0 | 307 | 89 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-00 LH2-00 | S | 0005 | 2009.255 | 2011.208 | 126.0 | 216.0 | 659 | 189 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-00 LH2-00 | S | 0006 | 2011.210 | 2015.365 | 126.0 | 216.0 | 1287 | 336 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| RSSD-IU | LH1-10 LH2-10 | S | 0001 | 2009.260 | 2011.208 | 0.0 | 90.0 | 658 | 68 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| RSSD-IU | LH1-10 LH2-10 | S | 0002 | 2011.210 | 2015.365 | 0.0 | 90.0 | 1287 | 159 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| RSSD-IU | LHN-10 LHE-10 | S | 0001 | 2008.169 | 2009.251 | 0.0 | 90.0 | 306 | 39 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| SSPA-IU | LH1-00 LH2-00 | S | 0001 | 2010.279 | 2015.365 | 170.0 | 260.0 | 1556 | 230 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| SSPA-IU | LH1-10 LH2-10 | S | 0001 | 2010.279 | 2012.243 | 0.0 | 90.0 | 629 | 16 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| SSPA-IU | LH1-10 LH2-10 | S | 0002 | 2012.244 | 2015.365 | 0.0 | 90.0 | 926 | 41 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSPA-IU | LHN-00 LHE-00 | S | 0001 | 2008.169 | 2008.169 | 0.0 | 90.0 | 1 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| SSPA-IU | LHN-00 LHE-00 | S | 0002 | 2008.222 | 2010.265 | 350.0 | 80.0 | 551 | 82 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| SSPA-IU | LHN-10 LHE-10 | S | 0002 | 2008.222 | 2010.265 | 356.0 | 86.0 | 547 | 6 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| TUC-IU | LH1-00 LH2-00 | S | 0001 | 2009.149 | 2010.354 | 1.0 | 91.0 | 464 | 74 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| TUC-IU | LH1-00 LH2-00 | S | 0002 | 2010.355 | 2011.177 | 1.0 | 91.0 | 216 | 44 | x | x | x | x | x | -5 | x | x | x | x | x | x | x | x | x |
| TUC-IU | LH1-00 LH2-00 | S | 0003 | 2011.181 | 2015.365 | 1.0 | 91.0 | 1316 | 260 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| TUC-IU | LH1-10 LH2-10 | S | 0001 | 2009.149 | 2010.354 | 359.0 | 89.0 | 464 | 94 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| TUC-IU | LH1-10 LH2-10 | S | 0002 | 2010.355 | 2014.322 | 359.0 | 89.0 | 1221 | 290 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| TUC-IU | LH1-10 LH2-10 | S | 0003 | 2014.324 | 2015.365 | 0.0 | 90.0 | 311 | 70 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| TUC-IU | LH1-60 LH2-60 | S | 0001 | 2012.312 | 2015.264 | 0.0 | 90.0 | 835 | 180 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| TUC-IU | LH1-60 LH2-60 | S | 0002 | 2015.265 | 2015.365 | 90.0 | 0.0 | 76 | 12 | x | x | x | x | x | x | -4 | x | x | x | x | x | x | x | x |
| TUC-IU | LHN-00 LHE-00 | S | 0002 | 2007.078 | 2009.148 | 1.0 | 91.0 | 651 | 121 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| WCI-IU | LH1-10 LH2-10 | S | 0001 | 2010.246 | 2015.365 | 0.0 | 90.0 | 1614 | 162 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| WCI-IU | LHN-00 LHE-00 | S | 0001 | 2008.169 | 2008.257 | 0.0 | 90.0 | 24 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| WCI-IU | LHN-00 LHE-00 | S | 0002 | 2008.268 | 2010.233 | 0.0 | 90.0 | 573 | 11 | x | x | x | x | x | -7 | x | x | x | x | x | x | x | x | x |
| WVT-IU | LH1-00 LH2-00 | S | 0001 | 2011.035 | 2012.168 | 0.0 | 90.0 | 486 | 25 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| WVT-IU | LH1-00 LH2-00 | S | 0002 | 2012.169 | 2015.365 | 0.0 | 90.0 | 1011 | 88 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| WVT-IU | LH1-10 LH2-10 | S | 0001 | 2011.035 | 2015.365 | 0.0 | 90.0 | 1496 | 102 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| WVT-IU | LHN LHE | S | 0002 | 2008.169 | 2008.260 | 0.0 | 90.0 | 26 | 3 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| WVT-IU | LHN LHE | S | 0003 | 2008.262 | 2011.022 | 0.0 | 90.0 | 627 | 41 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |