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 | M | 0001 | 2013.134 | 2015.149 | 0.0 | 90.0 | 106 | 35 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| BJT-IC | LH1-10 LH2-10 | M | 0001 | 2013.134 | 2015.149 | 0.0 | 90.0 | 106 | 31 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| BJT-IC | LHN LHE | M | 0001 | 1994.149 | 1999.037 | 358.0 | 88.0 | 190 | 89 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| BJT-IC | LHN-00 LHE-00 | M | 0001 | 1999.063 | 2010.246 | 358.0 | 88.0 | 460 | 237 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| BJT-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2013.104 | 358.0 | 88.0 | 125 | 51 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| ENH-IC | LH1-10 LH2-10 | M | 0001 | 2013.188 | 2015.149 | 0.0 | 90.0 | 97 | 33 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| ENH-IC | LHN LHE | M | 0001 | 1997.263 | 1999.213 | 0.0 | 90.0 | 56 | 20 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| ENH-IC | LHN-00 LHE-00 | M | 0001 | 1999.229 | 2000.088 | 0.0 | 90.0 | 24 | 14 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| ENH-IC | LHN-00 LHE-00 | M | 0002 | 2000.114 | 2010.272 | 0.0 | 90.0 | 453 | 197 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| ENH-IC | LHN-00 LHE-00 | M | 0003 | 2010.294 | 2013.113 | 0.0 | 90.0 | 127 | 23 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| ENH-IC | LHN-10 LHE-10 | M | 0001 | 1999.229 | 2010.272 | 0.0 | 90.0 | 478 | 10 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| ENH-IC | LHN-10 LHE-10 | M | 0002 | 2010.294 | 2011.052 | 0.0 | 90.0 | 19 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| ENH-IC | LHN-10 LHE-10 | M | 0003 | 2011.065 | 2013.113 | 0.0 | 90.0 | 108 | 4 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| HIA-IC | LH1-00 LH2-00 | M | 0001 | 2013.175 | 2015.149 | 357.0 | 87.0 | 101 | 33 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HIA-IC | LH1-10 LH2-10 | M | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 101 | 33 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| HIA-IC | LHN LHE | M | 0001 | 1995.006 | 1999.137 | 357.0 | 87.0 | 187 | 95 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HIA-IC | LHN-00 LHE-00 | M | 0001 | 1999.166 | 2010.272 | 357.0 | 87.0 | 479 | 241 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| HIA-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2013.113 | 357.0 | 87.0 | 129 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| KMI-IC | LH1-00 LH2-00 | M | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 86 | 19 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| KMI-IC | LH1-10 LH2-10 | M | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 85 | 19 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| KMI-IC | LHN LHE | M | 0001 | 1996.120 | 1996.249 | 0.0 | 270.0 | 20 | 5 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| KMI-IC | LHN LHE | M | 0002 | 1996.264 | 1999.229 | 0.0 | 90.0 | 96 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| KMI-IC | LHN-00 LHE-00 | M | 0001 | 1999.232 | 2010.272 | 0.0 | 90.0 | 475 | 152 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| KMI-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2012.356 | 0.0 | 90.0 | 103 | 27 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| KMI-IC | LHN-10 LHE-10 | M | 0001 | 1999.232 | 2010.272 | 0.0 | 90.0 | 475 | 89 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| KMI-IC | LHN-10 LHE-10 | M | 0002 | 2010.294 | 2012.356 | 0.0 | 90.0 | 102 | 19 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| LSA-IC | LH1-00 LH2-00 | M | 0001 | 2013.175 | 2014.133 | 0.0 | 90.0 | 53 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| LSA-IC | LH1-00 LH2-00 | M | 0002 | 2014.144 | 2015.149 | 0.0 | 90.0 | 49 | 19 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| LSA-IC | LH1-10 LH2-10 | M | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 99 | 30 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| LSA-IC | LHN LHE | M | 0001 | 1995.226 | 1998.093 | 0.0 | 90.0 | 116 | 37 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| LSA-IC | LHN LHE | M | 0002 | 1998.123 | 1999.192 | 0.0 | 90.0 | 36 | 11 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| LSA-IC | LHN-00 LHE-00 | M | 0001 | 1999.213 | 2004.162 | 0.0 | 90.0 | 178 | 36 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| LSA-IC | LHN-00 LHE-00 | M | 0002 | 2004.180 | 2010.272 | 0.0 | 90.0 | 274 | 70 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| LSA-IC | LHN-00 LHE-00 | M | 0003 | 2010.294 | 2013.110 | 0.0 | 90.0 | 127 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| LSA-IC | LHN-10 LHE-10 | M | 0001 | 1999.213 | 2010.272 | 0.0 | 90.0 | 452 | 25 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| LSA-IC | LHN-10 LHE-10 | M | 0002 | 2010.294 | 2013.110 | 0.0 | 90.0 | 127 | 30 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LH1-00 LH2-00 | M | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 102 | 19 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LH1-10 LH2-10 | M | 0001 | 2013.175 | 2015.149 | 0.0 | 90.0 | 101 | 22 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LHN LHE | M | 0001 | 1996.317 | 1996.345 | 180.0 | 270.0 | 4 | 3 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| MDJ-IC | LHN LHE | M | 0002 | 1996.357 | 1999.136 | 0.0 | 90.0 | 86 | 34 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-00 LHE-00 | M | 0001 | 1999.166 | 2010.272 | 0.0 | 90.0 | 487 | 232 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2013.113 | 0.0 | 90.0 | 120 | 53 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-10 LHE-10 | M | 0001 | 1999.166 | 2010.272 | 0.0 | 90.0 | 488 | 67 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| MDJ-IC | LHN-10 LHE-10 | M | 0002 | 2010.294 | 2011.071 | 0.0 | 90.0 | 27 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| MDJ-IC | LHN-10 LHE-10 | M | 0003 | 2011.083 | 2013.113 | 0.0 | 90.0 | 92 | 34 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| QIZ-IC | LH1-00 LH2-00 | M | 0001 | 2013.038 | 2015.149 | 0.0 | 90.0 | 118 | 44 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| QIZ-IC | LH1-10 LH2-10 | M | 0001 | 2013.038 | 2015.149 | 0.0 | 90.0 | 118 | 29 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| QIZ-IC | LHN-00 LHE-00 | M | 0001 | 2001.055 | 2010.272 | 0.0 | 90.0 | 414 | 104 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| QIZ-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2013.005 | 0.0 | 90.0 | 102 | 38 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| SSE-IC | LH1-00 LH2-00 | M | 0001 | 2013.188 | 2015.115 | 0.0 | 90.0 | 89 | 38 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LH1-10 LH2-10 | M | 0001 | 2013.175 | 2015.115 | 0.0 | 90.0 | 88 | 32 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| SSE-IC | LHN LHE | M | 0001 | 1996.264 | 1999.166 | 353.0 | 82.0 | 98 | 48 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| SSE-IC | LHN-00 LHE-00 | M | 0001 | 1999.192 | 2010.272 | 353.0 | 82.0 | 462 | 165 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| SSE-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2013.113 | 353.0 | 82.0 | 116 | 51 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LHN-10 LHE-10 | M | 0001 | 1999.192 | 2010.272 | 353.0 | 83.0 | 460 | 14 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| SSE-IC | LHN-10 LHE-10 | M | 0002 | 2010.294 | 2012.356 | 353.0 | 83.0 | 96 | 1 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| WMQ-IC | LH1-00 LH2-00 | M | 0001 | 2013.175 | 2015.115 | 0.0 | 90.0 | 85 | 26 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| WMQ-IC | LH1-10 LH2-10 | M | 0001 | 2013.175 | 2015.115 | 0.0 | 90.0 | 84 | 28 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN LHE | M | 0001 | 1995.276 | 1999.166 | 0.0 | 90.0 | 155 | 58 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN-00 LHE-00 | M | 0001 | 1999.192 | 2009.242 | 0.0 | 90.0 | 409 | 131 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2013.113 | 0.0 | 90.0 | 123 | 38 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | M | 0001 | 1999.192 | 2008.045 | 0.0 | 90.0 | 346 | 18 | x | x | x | x | x | x | x | 1 | x | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | M | 0002 | 2008.051 | 2009.078 | 0.0 | 90.0 | 44 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | M | 0003 | 2009.097 | 2009.242 | 0.0 | 90.0 | 16 | 2 | x | x | x | x | x | x | x | x | 3 | x | x | x | x | x | x |
| WMQ-IC | LHN-10 LHE-10 | M | 0004 | 2010.294 | 2012.356 | 0.0 | 90.0 | 103 | 4 | x | x | x | x | x | x | -3 | x | x | x | x | x | x | x | x |
| XAN-IC | LH1-00 LH2-00 | M | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 84 | 26 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| XAN-IC | LH1-10 LH2-10 | M | 0001 | 2013.225 | 2015.115 | 0.0 | 90.0 | 83 | 21 | x | x | x | x | x | x | x | -1 | x | x | x | x | x | x | x |
| XAN-IC | LHN LHE | M | 0001 | 1992.355 | 1994.319 | 0.0 | 90.0 | 72 | 13 | x | x | x | x | x | x | -2 | x | x | x | x | x | x | x | x |
| XAN-IC | LHN LHE | M | 0002 | 1995.165 | 1999.166 | 0.0 | 90.0 | 162 | 38 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| XAN-IC | LHN-00 LHE-00 | M | 0001 | 1999.192 | 2010.272 | 0.0 | 90.0 | 454 | 15 | x | x | x | x | x | x | x | x | 2 | x | x | x | x | x | x |
| XAN-IC | LHN-00 LHE-00 | M | 0002 | 2010.294 | 2012.356 | 0.0 | 90.0 | 107 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | M | 0001 | 1999.192 | 2008.056 | 0.0 | 90.0 | 339 | 61 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | M | 0002 | 2008.063 | 2010.225 | 0.0 | 90.0 | 112 | 21 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | M | 0003 | 2010.246 | 2010.272 | 0.0 | 90.0 | 3 | 0 | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x |
| XAN-IC | LHN-10 LHE-10 | M | 0004 | 2010.294 | 2012.356 | 0.0 | 90.0 | 107 | 29 | x | x | x | x | x | x | x | 0 | x | x | x | x | x | x | x |