Polarization anomalies at various stations

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

Ascii file with the data

Arrival-angle anomalies
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
APE-GE LHN LHE S 0001 2000.350 2006.346 0.0 90.0 714 40 x x x x x -6 x x x x x x x x x
APEZ-GE LHN LHE S 0001 2000.112 2004.001 0.0 90.0 418 14 x x x x x x x -1 x x x x x x x
BGIO-GE LHN LHE S 0001 1994.130 1996.091 0.0 90.0 253 16 x x x x x x x x x 6 x x x x x
BOA-GE LHN LHE S 0001 2000.056 2003.010 0.0 90.0 203 10 x x x x x x x x x x x 12 x x x
BOAB-GE LHN LHE S 0002 2007.158 2007.238 0.0 90.0 39 0 x x x x x x x x x x x x x x x
BOAB-GE LHN LHE S 0003 2008.020 2015.149 0.0 90.0 525 2 x x x x x x x x x x x x x x x
CART-GE LHN LHE S 0001 1997.351 1999.184 0.0 90.0 158 12 x x x x x x x -1 x x x x x x x
CART-GE LHN LHE S 0002 1999.188 2006.346 0.0 90.0 868 61 x x x x x x -2 x x x x x x x x
CSS-GE LHN LHE S 0001 1998.348 1999.200 0.0 90.0 53 4 x x x x -9 x x x x x x x x x x
CSS-GE LHN LHE S 0002 1999.207 2006.346 0.0 90.0 918 85 x x x x x x x -1 x x x x x x x
DAG-GE LHN LHE S 0001 1998.242 1999.192 0.0 90.0 84 8 x x x x x x x x 4 x x x x x x
DAG-GE LHN LHE S 0002 1999.200 2015.149 0.0 90.0 1430 123 x x x x x x x 0 x x x x x x x
DAMY-GE LHN LHE S 0001 2012.307 2015.053 0.0 90.0 291 3 x x -17 x x x x x x x x x x x x
DSB-GE LHN LHE S 0001 1993.354 1999.192 0.0 90.0 594 64 x x x x x x x 1 x x x x x x x
DSB-GE LHN LHE S 0002 1999.250 2006.346 0.0 90.0 846 63 x x x x x x x x x 5 x x x x x
EIL-GE LHN LHE S 0001 1997.029 1999.200 0.0 90.0 244 11 x x x x x x x x x 5 x x x x x
EIL-GE LHN LHE S 0002 1999.209 2005.205 0.0 90.0 686 46 x x x x x x x 1 x x x x x x x
EIL-GE LHN LHE S 0004 2006.006 2007.356 0.0 90.0 267 13 x x x x x x -3 x x x x x x x x
EIL-GE LHN LHE S 0006 2008.144 2015.149 0.0 90.0 1013 115 x x x x x x -4 x x x x x x x x
FODE-GE LHN LHE S 0001 2000.112 2003.208 0.0 90.0 347 14 x x x x x x -3 x x x x x x x x
GVD-GE LHN LHE S 0001 1999.305 2000.098 0.0 90.0 64 0 x x x x x x x x x x x x x x x
GVD-GE LHN LHE S 0002 2000.112 2003.254 0.0 90.0 381 0 x x x x x x x x x x x x x x x
GVD-GE LHN LHE S 0003 2003.255 2006.346 0.0 90.0 367 5 x x x x x -7 x x x x x x x x x
HLG-GE LHN LHE S 0001 2001.352 2002.169 0.0 90.0 52 3 x x x x x x x 0 x x x x x x x
HLG-GE LHN LHE S 0002 2002.173 2006.346 0.0 90.0 576 32 x x x x x x x 1 x x x x x x x
IBBN-GE LHN LHE S 0001 1999.200 2005.242 0.0 90.0 717 18 x x x x x x -3 x x x x x x x x
IBBN-GE LHN LHE S 0002 2005.268 2006.346 0.0 90.0 149 3 x x x x x x -3 x x x x x x x x
ISP-GE LHN LHE S 0001 1996.309 1999.188 0.0 90.0 232 26 x x x x x x x 1 x x x x x x x
ISP-GE LHN LHE S 0002 1999.250 2006.346 0.0 90.0 848 80 x x x x x x x x 3 x x x x x x
JER-GE LHN LHE S 0001 1996.132 1996.198 0.0 90.0 24 1 x x x x x x x x x x 10 x x x x
JER-GE LHN LHE S 0002 1996.207 1998.328 0.0 90.0 240 18 x x x x x x x x 4 x x x x x x
JER-GE LHN LHE S 0004 1999.019 1999.116 0.0 90.0 30 0 x x x x x x x x x x x x x x x
JER-GE LHN LHE S 0005 1999.125 2003.179 0.0 90.0 370 21 x x x x x x x x 3 x x x x x x
KBS-GE LHN LHE S 0001 1994.318 1999.101 0.0 90.0 485 100 x x x x x x x x 2 x x x x x x
KBS-GE LHN-00 LHE-00 S 0001 1999.110 2006.346 0.0 90.0 832 189 x x x x x x x x 4 x x x x x x
KBS-GE LHN-10 LHE-10 S 0001 1999.110 2006.346 0.0 90.0 807 60 x x x x x x -4 x x x x x x x x
KMBO-GE LHN LHE S 0001 1995.260 1999.136 0.0 90.0 324 23 x x x x x x -4 x x x x x x x x
KMBO-GE LHN-00 LHE-00 S 0001 1999.157 2001.057 0.0 90.0 114 10 x x x x x x -4 x x x x x x x x
KMBO-GE LHN-00 LHE-00 S 0002 2001.059 2003.061 0.0 90.0 92 11 x x x x -9 x x x x x x x x x x
KMBO-GE LHN-00 LHE-00 S 0003 2003.069 2006.346 0.0 90.0 412 23 x x x x x -7 x x x x x x x x x
KMBO-GE LHN-10 LHE-10 S 0001 1999.157 2001.057 0.0 90.0 113 7 x x x -12 x x x x x x x x x x x
KMBO-GE LHN-10 LHE-10 S 0002 2001.059 2003.061 0.0 90.0 75 5 x x x -11 x x x x x x x x x x x
KMBO-GE LHN-10 LHE-10 S 0003 2003.069 2006.346 0.0 90.0 313 24 x x x -12 x x x x x x x x x x x
KRIS-GE LHN LHE S 0001 1998.235 2004.140 0.0 90.0 583 12 x x x x x -5 x x x x x x x x x
KSDI-GE LHN LHE S 0001 2002.036 2006.346 0.0 90.0 557 30 x x x x x x x x x x x x x x x
KWP-GE LHN LHE S 0001 1999.177 2006.346 0.0 90.0 948 33 x x x x -10 x x x x x x x x x x
LAST-GE LHN LHE S 0001 2004.177 2006.299 0.0 90.0 293 18 x x x -14 x x x x x x x x x x x
LID-GE LHN LHE S 0001 1995.143 1995.302 0.0 90.0 66 2 x x x x x x x x x 5 x x x x x
LVC-GE LHN LHE S 0001 1997.017 1998.319 0.0 90.0 38 4 x x x x -9 x x x x x x x x x x
LVC-GE LHN-00 LHE-00 S 0001 1999.355 2001.116 0.0 90.0 36 1 x x x -12 x x x x x x x x x x x
LVC-GE LHN-00 LHE-00 S 0002 2001.145 2004.001 0.0 90.0 193 14 x x x x x x -3 x x x x x x x x
LVC-GE LHN-10 LHE-10 S 0001 1999.355 2001.116 0.0 90.0 36 1 x x -17 x x x x x x x x x x x x
LVC-GE LHN-10 LHE-10 S 0002 2001.145 2004.001 0.0 90.0 190 7 x x x x -8 x x x x x x x x x x
MAHO-GE LHN LHE S 0001 1999.166 2001.032 0.0 90.0 158 12 x x x x x x x x x x x 11 x x x
MAHO-GE LHN LHE S 0002 2001.045 2006.346 0.0 90.0 528 62 x x x x x x x x x x 9 x x x x
MALT-GE LHN LHE S 0001 2000.154 2006.337 0.0 90.0 721 59 x x x x x x x -1 x x x x x x x
MAUI-GE LHN LHE S 0001 1999.177 2000.026 0.0 90.0 59 7 x x x -12 x x x x x x x x x x x
MAUI-GE LHN LHE S 0002 2000.088 2008.082 0.0 90.0 803 44 x x x -14 x x x x x x x x x x x
MELI-GE LHN LHE S 0001 1999.355 2004.029 0.0 90.0 490 16 x x x x x x x 1 x x x x x x x
MELI-GE LHN LHE S 0002 2004.035 2006.346 0.0 90.0 361 5 x x -16 x x x x x x x x x x x x
MHV-GE LHN LHE S 0001 1995.134 1999.177 0.0 90.0 479 65 x x x x x x x 0 x x x x x x x
MHV-GE LHN LHE S 0002 1999.184 2004.001 0.0 90.0 450 61 x x x x x x x 1 x x x x x x x
MLR-GE LHN LHE S 0001 1994.286 1999.192 0.0 90.0 484 24 x x x x x x x x x 6 x x x x x
MLR-GE LHN LHE S 0002 1999.200 2003.282 0.0 90.0 457 23 x x x x x x x x x 7 x x x x x
MORC-GE LHN LHE S 0001 1993.323 1999.298 0.0 90.0 672 75 x x x x x x x 1 x x x x x x x
MORC-GE LHN LHE S 0002 1999.340 2006.346 0.0 90.0 897 152 x x x x x x x 1 x x x x x x x
MRNI-GE LHN LHE S 0001 1998.246 1999.207 0.0 90.0 62 1 -51 x x x x x x x x x x x x x x
MRNI-GE LHN LHE S 0002 1999.209 2002.022 0.0 90.0 222 9 x x x x x x x 1 x x x x x x x
MTE-GE LHN LHE S 0001 1997.286 1999.157 0.0 90.0 145 16 x x x x x x -4 x x x x x x x x
MTE-GE LHN LHE S 0002 1999.166 2006.295 0.0 90.0 914 117 x x x x x x -3 x x x x x x x x
NAI-GE LHN LHE S 0001 1995.071 1995.259 0.0 90.0 82 8 x x x x x x x x x 5 x x x x x
PMG-GE LHN LHE S 0001 1993.253 1999.132 0.0 90.0 566 109 x x x x x x x 1 x x x x x x x
PMG-GE LHN-00 LHE-00 S 0001 1999.136 2002.263 0.0 90.0 367 120 x x x x x x x 1 x x x x x x x
PMG-GE LHN-00 LHE-00 S 0002 2002.306 2003.158 0.0 90.0 69 24 x x x x x x x x 2 x x x x x x
PMG-GE LHN-00 LHE-00 S 0003 2003.163 2004.001 0.0 90.0 69 32 x x x x x x x x 3 x x x x x x
PMG-GE LHN-10 LHE-10 S 0001 2003.163 2003.363 0.0 90.0 66 30 x x x x x x x 1 x x x x x x x
PSZ-GE LHN LHE S 0001 1995.344 1999.258 0.0 90.0 187 21 x x x x x x x 0 x x x x x x x
PSZ-GE LHN LHE S 0002 1999.340 2001.245 0.0 90.0 172 19 x x x x x x x x 3 x x x x x x
PSZ-GE LHN LHE S 0003 2001.272 2002.169 0.0 90.0 79 13 x x x x x x x -1 x x x x x x x
PSZ-GE LHN LHE S 0004 2002.173 2006.346 0.0 90.0 586 106 x x x x x x x x x 5 x x x x x
PUL-GE LHN LHE S 0001 1998.178 1999.320 0.0 90.0 110 6 x x x x x x x 0 x x x x x x x
PUL-GE LHN LHE S 0002 1999.321 2004.001 0.0 90.0 476 31 x x x x x x x 1 x x x x x x x
RGN-GE LHN LHE S 0001 1995.336 1999.142 0.0 90.0 386 43 x x x x -9 x x x x x x x x x x
RGN-GE LHN LHE S 0002 1999.157 2006.346 0.0 90.0 927 90 x x x x -10 x x x x x x x x x x
RIOB-GE LHN LHE S 0001 2002.344 2004.001 0.0 90.0 58 1 x x x x x x x -1 x x x x x x x
RUE-GE LHN LHE S 0002 2000.020 2006.346 0.0 90.0 859 100 x x x x x x x -1 x x x x x x x
SANT-GE LHN LHE S 0001 1998.073 1999.250 0.0 90.0 139 0 x x x x x x x x x x x x x x x
SANT-GE LHN LHE S 0002 2000.013 2006.346 0.0 90.0 837 9 x x -17 x x x x x x x x x x x x
SELV-GE LHN LHE S 0001 2002.002 2003.272 0.0 90.0 162 14 x x x x x x x x 2 x x x x x x
SFJ-GE LHN LHE S 0001 1996.082 1999.053 0.0 90.0 249 8 x x x x x x -2 x x x x x x x x
SFJ-GE LHN-00 LHE-00 S 0001 1999.063 2002.157 0.0 90.0 310 18 x x x x x x x 1 x x x x x x x
SFJ-GE LHN-00 LHE-00 S 0002 2002.161 2004.001 0.0 90.0 189 10 x x x x x x x x 2 x x x x x x
SFS-GE LHN LHE S 0001 2001.309 2001.332 0.0 90.0 10 0 x x x x x x x x x x x x x x x
SFS-GE LHN LHE S 0002 2001.336 2006.346 0.0 90.0 636 29 x x x x x x x x x x x x x x x
SFUC-GE LHN LHE S 0001 1996.197 1999.172 0.0 90.0 333 34 x x x x x x x x 3 x x x x x x
SFUC-GE LHN LHE S 0002 1999.177 2001.285 0.0 90.0 257 18 x x x x x x x x 2 x x x x x x
SKD-GE LHN LHE S 0001 1998.047 1999.258 0.0 90.0 118 4 x x x x x x x x x x x x x x x
SKD-GE LHN LHE S 0002 1999.260 2000.094 0.0 90.0 75 6 x x x x -8 x x x x x x x x x x
SKD-GE LHN LHE S 0003 2000.112 2000.280 0.0 90.0 71 3 x x x -13 x x x x x x x x x x x
SKD-GE LHN LHE S 0004 2000.295 2004.283 0.0 90.0 418 17 x x x x x x -3 x x x x x x x x
SNAA-GE LHN LHE S 0001 1997.068 1999.283 0.0 90.0 194 15 x x x x x x -4 x x x x x x x x
SNAA-GE LHN LHE S 0002 1999.286 2003.004 0.0 90.0 354 15 x x x x x x -4 x x x x x x x x
SNAA-GE LHN LHE S 0003 2003.010 2015.149 0.0 90.0 1652 46 x x x x x x x x x 7 x x x x x
STU-GE LHN LHE S 0001 1994.121 1996.338 0.0 90.0 309 54 x x x x x x x 1 x x x x x x x
STU-GE LHN LHE S 0002 1996.344 1998.117 0.0 90.0 161 7 x x x x x x x x x 7 x x x x x
STU-GE LHN LHE S 0003 1998.123 1999.363 0.0 90.0 174 22 x x x x x x x 1 x x x x x x x
STU-GE LHN LHE S 0004 2000.001 2006.346 0.0 90.0 871 132 x x x x x x x 1 x x x x x x x
SUMG-GE LHN LHE S 0001 2002.164 2007.153 0.0 90.0 427 28 x x x x x x x x 2 x x x x x x
SUMG-GE LHN LHE S 0002 2007.158 2007.343 0.0 90.0 94 4 x x x x x x -4 x x x x x x x x
SUMG-GE LHN LHE S 0003 2007.347 2010.195 0.0 90.0 411 27 x x x x x x -3 x x x x x x x x
SUMG-GE LHN LHE S 0004 2010.201 2012.190 0.0 90.0 286 31 x x x x x x -3 x x x x x x x x
SUMG-GE LHN LHE S 0005 2012.202 2013.203 0.0 90.0 144 34 x x x x x -5 x x x x x x x x x
SUMG-GE LHN LHE S 0006 2013.207 2015.149 0.0 90.0 278 54 x x x x x x x x 4 x x x x x x
SUW-GE LHN LHE S 0001 1995.312 1999.209 0.0 90.0 431 40 x x x x x x -2 x x x x x x x x
SUW-GE LHN LHE S 0002 1999.250 2010.147 0.0 90.0 1496 109 x x x x x -5 x x x x x x x x x
TIRR-GE LHN LHE S 0001 2003.290 2015.149 0.0 90.0 1685 157 x x x x x x x -1 x x x x x x x
TRTE-GE LHN LHE S 0001 1996.188 1999.209 0.0 90.0 331 11 x x x x x x -4 x x x x x x x x
TRTE-GE LHN LHE S 0002 1999.250 2003.107 0.0 90.0 427 11 x x x x x x -2 x x x x x x x x
UGM-GE LHN LHE S 0001 1996.248 1999.190 0.0 90.0 82 14 x x x x x x x x 2 x x x x x x
UGM-GE LHN LHE S 0002 1999.350 2004.001 0.0 90.0 358 87 x x x x x x x x 4 x x x x x x
UGM-GE LHN LHE S 0004 2007.011 2015.149 0.0 90.0 1211 222 x x x x x x x 0 x x x x x x x
VSU-GE LHN LHE S 0001 2003.117 2015.149 0.0 90.0 1787 65 x x x x x -7 x x x x x x x x x
WLF-GE LHN LHE S 0001 1994.090 1999.353 0.0 90.0 673 95 x x x x x x x 1 x x x x x x x
WLF-GE LHN LHE S 0002 1999.355 2006.346 0.0 90.0 884 119 x x x x x x x 1 x x x x x x x
ZKR-GE LHN LHE S 0002 2003.264 2006.346 90.0 90.0 385 6 x x x x x x x x x x x x x x 82