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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BJT-IC | LH1-00 LH2-00 | S | 0001 | 2013.131 | 2015.149 | 0.0 | 90.0 | 305 | 84 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| BJT-IC | LH1-10 LH2-10 | S | 0001 | 2013.131 | 2015.149 | 0.0 | 90.0 | 307 | 88 | x | x | x | x | x | x | -4 | x | x | x | x | x | x | x | x |
| BJT-IC | LHN LHE | S | 0001 | 1994.145 | 1999.037 | 358.0 | 88.0 | 560 | 197 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| BJT-IC | LHN-00 LHE-00 | S | 0001 | 1999.042 | 2010.281 | 358.0 | 88.0 | 1516 | 580 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| BJT-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2013.104 | 358.0 | 88.0 | 374 | 162 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| ENH-IC | LH1-00 LH2-00 | S | 0002 | 2013.257 | 2013.329 | 358.0 | 90.0 | 2 | 1 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| ENH-IC | LH1-10 LH2-10 | S | 0001 | 2013.183 | 2015.149 | 0.0 | 90.0 | 280 | 77 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| ENH-IC | LHN LHE | S | 0001 | 1997.263 | 1999.224 | 0.0 | 90.0 | 175 | 44 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| ENH-IC | LHN-00 LHE-00 | S | 0001 | 1999.226 | 2000.098 | 0.0 | 90.0 | 88 | 26 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| ENH-IC | LHN-00 LHE-00 | S | 0002 | 2000.112 | 2010.281 | 0.0 | 90.0 | 1456 | 555 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| ENH-IC | LHN-00 LHE-00 | S | 0003 | 2010.294 | 2013.116 | 0.0 | 90.0 | 386 | 104 | x | x | x | x | x | x | x | x | 4 | x | x | x | x | x | x |
| ENH-IC | LHN-10 LHE-10 | S | 0001 | 1999.226 | 2010.281 | 0.0 | 90.0 | 1543 | 144 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| ENH-IC | LHN-10 LHE-10 | S | 0002 | 2010.294 | 2011.060 | 0.0 | 90.0 | 51 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| ENH-IC | LHN-10 LHE-10 | S | 0003 | 2011.065 | 2013.116 | 0.0 | 90.0 | 334 | 60 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HIA-IC | LH1-00 LH2-00 | S | 0001 | 2013.175 | 2015.149 | 357.0 | 87.0 | 283 | 81 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| HIA-IC | LH1-10 LH2-10 | S | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 284 | 81 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| HIA-IC | LHN LHE | S | 0001 | 1995.006 | 1999.142 | 357.0 | 87.0 | 541 | 176 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HIA-IC | LHN LHE | S | 0002 | 1999.157 | 1999.157 | 87.0 | 87.0 | 1 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| HIA-IC | LHN-00 LHE-00 | S | 0001 | 1999.166 | 2010.281 | 357.0 | 87.0 | 1578 | 574 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HIA-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2013.116 | 357.0 | 87.0 | 386 | 1 | -43 | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| KMI-IC | LH1-00 LH2-00 | S | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 252 | 65 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| KMI-IC | LH1-10 LH2-10 | S | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 253 | 66 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| KMI-IC | LHN LHE | S | 0001 | 1996.120 | 1996.250 | 0.0 | 270.0 | 52 | 15 | x | x | x | x | x | -5 | x | x | x | x | x | x | x | x | x |
| KMI-IC | LHN LHE | S | 0002 | 1996.255 | 1999.229 | 0.0 | 90.0 | 305 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| KMI-IC | LHN-00 LHE-00 | S | 0001 | 1999.232 | 2010.281 | 0.0 | 90.0 | 1529 | 540 | x | x | x | x | x | x | -4 | x | x | x | x | x | x | x | x |
| KMI-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2012.356 | 0.0 | 90.0 | 310 | 123 | x | x | x | x | x | x | -4 | x | x | x | x | x | x | x | x |
| KMI-IC | LHN-10 LHE-10 | S | 0001 | 1999.232 | 2010.281 | 0.0 | 90.0 | 1529 | 454 | x | x | x | x | x | x | -4 | x | x | x | x | x | x | x | x |
| KMI-IC | LHN-10 LHE-10 | S | 0002 | 2010.294 | 2013.015 | 0.0 | 90.0 | 310 | 119 | x | x | x | x | x | -5 | x | x | x | x | x | x | x | x | x |
| LSA-IC | LH1-00 LH2-00 | S | 0001 | 2013.175 | 2014.141 | 0.0 | 90.0 | 147 | 1 | -49 | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| LSA-IC | LH1-00 LH2-00 | S | 0002 | 2014.144 | 2015.149 | 0.0 | 90.0 | 142 | 29 | x | x | x | x | x | -5 | x | x | x | x | x | x | x | x | x |
| LSA-IC | LH1-10 LH2-10 | S | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 278 | 59 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| LSA-IC | LHN LHE | S | 0001 | 1995.219 | 1998.093 | 0.0 | 90.0 | 333 | 49 | x | x | x | x | x | x | x | x | 4 | x | x | x | x | x | x |
| LSA-IC | LHN LHE | S | 0002 | 1998.101 | 1999.207 | 0.0 | 90.0 | 124 | 23 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| LSA-IC | LHN-00 LHE-00 | S | 0001 | 1999.209 | 2004.162 | 0.0 | 90.0 | 573 | 80 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| LSA-IC | LHN-00 LHE-00 | S | 0002 | 2004.177 | 2010.281 | 0.0 | 90.0 | 913 | 221 | x | x | x | x | x | x | x | x | 4 | x | x | x | x | x | x |
| LSA-IC | LHN-00 LHE-00 | S | 0003 | 2010.294 | 2013.116 | 0.0 | 90.0 | 386 | 7 | x | x | x | x | x | x | -4 | x | x | x | x | x | x | x | x |
| LSA-IC | LHN-10 LHE-10 | S | 0001 | 1999.209 | 2010.281 | 0.0 | 90.0 | 1485 | 125 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| LSA-IC | LHN-10 LHE-10 | S | 0002 | 2010.294 | 2013.116 | 0.0 | 90.0 | 386 | 80 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LH1-00 LH2-00 | S | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 288 | 77 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| MDJ-IC | LH1-10 LH2-10 | S | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 289 | 78 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| MDJ-IC | LHN LHE | S | 0001 | 1996.316 | 1996.345 | 180.0 | 270.0 | 15 | 3 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| MDJ-IC | LHN LHE | S | 0002 | 1996.357 | 1999.136 | 0.0 | 90.0 | 251 | 61 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-00 LHE-00 | S | 0001 | 1999.142 | 2010.281 | 0.0 | 90.0 | 1574 | 543 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2013.116 | 0.0 | 90.0 | 369 | 138 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-10 LHE-10 | S | 0001 | 1999.142 | 2010.281 | 0.0 | 90.0 | 1575 | 468 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-10 LHE-10 | S | 0002 | 2010.294 | 2011.076 | 0.0 | 90.0 | 76 | 15 | x | x | x | x | x | -6 | x | x | x | x | x | x | x | x | x |
| MDJ-IC | LHN-10 LHE-10 | S | 0003 | 2011.079 | 2013.116 | 0.0 | 90.0 | 292 | 108 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| QIZ-IC | LH1-00 LH2-00 | S | 0001 | 2013.038 | 2015.149 | 0.0 | 90.0 | 340 | 98 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| QIZ-IC | LH1-10 LH2-10 | S | 0001 | 2013.038 | 2015.149 | 0.0 | 90.0 | 339 | 96 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| QIZ-IC | LHN-00 LHE-00 | S | 0001 | 2001.049 | 2010.281 | 0.0 | 90.0 | 1337 | 394 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| QIZ-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2013.005 | 0.0 | 90.0 | 314 | 108 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LH1-00 LH2-00 | S | 0001 | 2013.175 | 2015.115 | 0.0 | 90.0 | 269 | 68 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LH1-10 LH2-10 | S | 0001 | 2013.175 | 2015.115 | 0.0 | 90.0 | 269 | 70 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LHN LHE | S | 0001 | 1996.264 | 1999.188 | 353.0 | 82.0 | 295 | 95 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| SSE-IC | LHN-00 LHE-00 | S | 0001 | 1999.190 | 2010.281 | 353.0 | 82.0 | 1508 | 446 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2013.116 | 353.0 | 82.0 | 351 | 147 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| SSE-IC | LHN-10 LHE-10 | S | 0001 | 1999.190 | 2010.281 | 353.0 | 83.0 | 1508 | 266 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LHN-10 LHE-10 | S | 0002 | 2010.294 | 2012.356 | 353.0 | 83.0 | 300 | 38 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| WMQ-IC | LH1-00 LH2-00 | S | 0001 | 2013.175 | 2015.115 | 0.0 | 90.0 | 259 | 63 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| WMQ-IC | LH1-10 LH2-10 | S | 0001 | 2013.175 | 2015.115 | 0.0 | 90.0 | 258 | 62 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN LHE | S | 0001 | 1995.266 | 1999.166 | 0.0 | 90.0 | 452 | 109 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN-00 LHE-00 | S | 0001 | 1999.169 | 2009.242 | 0.0 | 90.0 | 1339 | 367 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| WMQ-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2013.116 | 0.0 | 90.0 | 367 | 121 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | S | 0001 | 1999.169 | 2008.047 | 0.0 | 90.0 | 1121 | 95 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | S | 0002 | 2008.051 | 2009.078 | 0.0 | 90.0 | 164 | 19 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | S | 0003 | 2009.089 | 2009.242 | 0.0 | 90.0 | 51 | 3 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | S | 0004 | 2010.294 | 2012.356 | 0.0 | 90.0 | 314 | 30 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| XAN-IC | LH1-00 LH2-00 | S | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 246 | 62 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| XAN-IC | LH1-10 LH2-10 | S | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 246 | 59 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| XAN-IC | LHN LHE | S | 0001 | 1992.336 | 1994.349 | 0.0 | 90.0 | 221 | 76 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| XAN-IC | LHN LHE | S | 0002 | 1995.149 | 1999.177 | 0.0 | 90.0 | 474 | 111 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| XAN-IC | LHN-00 LHE-00 | S | 0001 | 1999.184 | 2010.272 | 0.0 | 90.0 | 1442 | 110 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| XAN-IC | LHN-00 LHE-00 | S | 0002 | 2010.294 | 2013.015 | 0.0 | 90.0 | 324 | 35 | x | x | x | x | x | x | x | x | x | 6 | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | S | 0001 | 1999.184 | 2008.056 | 0.0 | 90.0 | 1065 | 305 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | S | 0002 | 2008.058 | 2010.236 | 0.0 | 90.0 | 371 | 101 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | S | 0003 | 2010.246 | 2010.272 | 0.0 | 90.0 | 9 | 5 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | S | 0004 | 2010.294 | 2012.356 | 0.0 | 90.0 | 322 | 129 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |