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
ADO-CI LHN LHE M 0007 2014.188 2015.351 355.6 85.6 71 5 x x x x x x x x 2 x x x x x x
ARV-CI LHN LHE M 0001 2006.002 2013.335 0.0 90.0 389 34 x x x x -8 x x x x x x x x x x
ARV-CI LHN LHE M 0002 2014.001 2015.351 0.0 90.0 107 10 x x x x -9 x x x x x x x x x x
BBR-CI LHN LHE M 0004 2006.002 2007.031 0.0 90.0 45 4 x x x x x x x x x x x 11 x x x
BBR-CI LHN LHE M 0005 2007.051 2009.328 0.0 90.0 140 6 x x x x x x x x x 5 x x x x x
BBR-CI LHN LHE M 0006 2010.003 2013.069 0.0 90.0 170 6 x x x x x x x x x x x 11 x x x
BBR-CI LHN LHE M 0007 2013.096 2015.351 0.0 90.0 147 11 x x x x x x x x 2 x x x x x x
BC3-CI LHN LHE M 0006 2006.002 2007.126 0.0 90.0 45 3 x x x x x x -2 x x x x x x x x
BC3-CI LHN LHE M 0007 2007.164 2010.195 0.0 90.0 162 8 x x x x x x x x 2 x x x x x x
BC3-CI LHN LHE M 0008 2010.199 2010.272 0.0 90.0 16 1 x x x x x x x x x 6 x x x x x
BC3-CI LHN LHE M 0009 2010.294 2014.043 0.0 90.0 161 15 x x x x x x x x x 5 x x x x x
BC3-CI LHN LHE M 0010 2014.061 2015.351 0.0 90.0 98 4 x x x x x -6 x x x x x x x x x
BEL-CI LHN LHE M 0002 2006.002 2010.195 0.0 90.0 215 21 x x x x x x -3 x x x x x x x x
BEL-CI LHN LHE M 0003 2010.199 2015.351 0.0 90.0 282 28 x x x x x x x -1 x x x x x x x
BFS-CI LHN LHE M 0002 2006.002 2008.133 0.0 90.0 120 8 x x x x x x x -1 x x x x x x x
BFS-CI LHN LHE M 0003 2008.144 2009.328 0.0 90.0 65 7 x x x x x x x -1 x x x x x x x
BFS-CI LHN LHE M 0004 2010.003 2015.351 0.0 90.0 311 32 x x x x x x x x 3 x x x x x x
CIA-CI LHN LHE M 0003 2006.002 2011.171 0.0 90.0 259 12 x x x x x -5 x x x x x x x x x
CIA-CI LHN LHE M 0005 2011.187 2014.287 0.0 90.0 164 10 x x x x x -7 x x x x x x x x x
CIA-CI LHN LHE M 0006 2014.305 2015.351 0.0 90.0 61 4 x x x x x -6 x x x x x x x x x
CWC-CI LHN LHE M 0005 2006.002 2011.052 0.0 90.0 229 4 x x -16 x x x x x x x x x x x x
CWC-CI LHN LHE M 0006 2011.068 2012.316 0.0 90.0 76 6 x x x x x x x 0 x x x x x x x
CWC-CI LHN LHE M 0007 2012.321 2015.351 0.0 90.0 166 14 x x x x x x x x 4 x x x x x x
DAN-CI LHN LHE M 0009 2006.002 2006.090 0.0 90.0 9 1 x x x x x x x x 3 x x x x x x
DAN-CI LHN LHE M 0014 2014.188 2015.351 0.0 90.0 71 5 x x x x x x x -1 x x x x x x x
DEC-CI LHN LHE M 0003 2006.002 2010.336 0.0 90.0 238 14 x x x x x x x x 2 x x x x x x
DEC-CI LHN LHE M 0004 2010.354 2015.351 0.0 90.0 264 11 x x x x x x x x 3 x x x x x x
DVT-CI LHN LHE M 0005 2006.002 2008.107 0.0 90.0 114 0 x x x x x x x x x x x x x x x
DVT-CI LHN LHE M 0006 2008.115 2008.165 0.0 90.0 8 0 x x x x x x x x x x x x x x x
DVT-CI LHN LHE M 0007 2008.179 2010.012 0.0 90.0 67 1 x x x x x x x 0 x x x x x x x
EDW2-CI LHN LHE M 0002 2006.002 2015.351 0.0 90.0 493 76 x x x x x x -4 x x x x x x x x
FMP-CI LHN LHE M 0004 2006.002 2009.065 0.0 90.0 150 9 x x x x x x x x x x 9 x x x x
FMP-CI LHN LHE M 0005 2009.078 2010.222 0.0 90.0 79 8 x x x x x x x x x x 8 x x x x
FMP-CI LHN LHE M 0006 2010.224 2015.351 0.0 90.0 271 21 x x x x x x x x x x 9 x x x x
FUR-CI LHN LHE M 0005 2006.002 2011.045 0.0 90.0 249 29 x x x x x x -4 x x x x x x x x
FUR-CI LHN LHE M 0006 2011.052 2015.351 0.0 90.0 251 24 x x x x x x -2 x x x x x x x x
GLA-CI LHN LHE M 0006 2006.002 2010.012 0.0 90.0 181 36 x x x x x -5 x x x x x x x x x
GLA-CI LHN LHE M 0007 2010.049 2012.274 0.0 90.0 137 21 x x x x x x -3 x x x x x x x x
GLA-CI LHN LHE M 0008 2012.283 2013.069 0.0 90.0 25 4 x x x x x x -3 x x x x x x x x
GLA-CI LHN LHE M 0009 2013.096 2015.351 0.0 90.0 147 24 x x x x x x -3 x x x x x x x x
GMR-CI LHN LHE M 0002 2006.232 2006.317 0.0 90.0 8 3 x x x x x -6 x x x x x x x x x
GMR-CI LHN LHE M 0003 2006.319 2007.304 0.0 90.0 48 5 x x x x -8 x x x x x x x x x x
GMR-CI LHN LHE M 0004 2007.314 2015.351 0.0 90.0 408 68 x x x x -8 x x x x x x x x x x
GRA-CI LHN LHE M 0004 2006.002 2010.177 0.0 90.0 207 13 x x x x x x -2 x x x x x x x x
GRA-CI LHN LHE M 0005 2010.195 2015.351 0.0 90.0 270 20 x x x x x x x x x 5 x x x x x
GSC-CI LHN LHE M 0005 2006.002 2006.219 0.0 90.0 23 4 x x x x x x -4 x x x x x x x x
GSC-CI LHN LHE M 0006 2006.232 2007.333 0.0 90.0 69 10 x x x x x x x -1 x x x x x x x
GSC-CI LHN LHE M 0007 2007.343 2007.343 0.0 90.0 1 0 x x x x x x x x x x x x x x x
GSC-CI LHN LHE M 0008 2007.350 2009.328 0.0 90.0 92 14 x x x x x x x x 2 x x x x x x
GSC-CI LHN LHE M 0009 2010.003 2013.329 180.0 90.0 209 21 x x x x x x x x 3 x x x x x x
GSC-CI LHN LHE M 0010 2013.335 2015.343 180.0 90.0 91 16 x x x x x x x x 3 x x x x x x
HEC-CI LHN LHE M 0003 2006.002 2011.052 0.0 90.0 250 22 x x x x -10 x x x x x x x x x x
HEC-CI LHN LHE M 0004 2011.065 2013.144 0.0 90.0 110 10 x x x x x -6 x x x x x x x x x
HEC-CI LHN LHE M 0005 2013.164 2015.351 0.0 90.0 136 26 x x x x x -6 x x x x x x x x x
IBP-CI LHN LHE M 0001 2010.103 2010.116 0.0 90.0 2 0 x x x x x x x x x x x x x x x
IBP-CI LHN LHE M 0002 2010.120 2011.101 0.0 90.0 55 1 x x x x x x x 0 x x x x x x x
IKP-CI LHN LHE M 0003 2011.130 2015.351 0.0 90.0 236 6 x x x x x x x x 4 x x x x x x
IRM-CI LHN LHE M 0007 2006.002 2006.232 16.0 106.0 24 4 x x x x x x -2 x x x x x x x x
IRM-CI LHN LHE M 0009 2006.271 2007.253 16.0 106.0 41 6 x x x x x x x 0 x x x x x x x
IRM-CI LHN LHE M 0010 2007.255 2009.321 0.0 90.0 116 8 x x x x x x x x x 5 x x x x x
IRM-CI LHN LHE M 0011 2009.328 2011.052 0.0 90.0 67 7 x x x x x x x x x x x 11 x x x
IRM-CI LHN LHE M 0012 2011.065 2015.351 0.0 90.0 249 19 x x x x x x x x x 7 x x x x x
ISA-CI LHN LHE M 0006 2006.002 2007.232 344.0 74.0 66 2 x x x x x -5 x x x x x x x x x
ISA-CI LHN LHE M 0008 2007.245 2007.333 344.0 74.0 26 0 x x x x x x x x x x x x x x x
ISA-CI LHN LHE M 0009 2007.343 2009.108 344.0 74.0 61 0 x x x x x x x x x x x x x x x
ISA-CI LHN LHE M 0011 2009.148 2009.245 344.0 74.0 13 0 x x x x x x x x x x x x x x x
ISA-CI LHN LHE M 0012 2009.272 2010.012 344.0 74.0 23 1 x x x x x -5 x x x x x x x x x
ISA-CI LHN LHE M 0013 2010.049 2013.030 344.0 74.0 151 0 x x x x x x x x x x x x x x x
ISA-CI LHN LHE M 0014 2013.033 2013.045 344.0 74.0 10 0 x x x x x x x x x x x x x x x
LGU-CI LHN LHE M 0002 2006.002 2006.237 0.0 90.0 26 2 x x x x x x x x x x x 15 x x x
LGU-CI LHN LHE M 0003 2006.244 2006.244 0.0 90.0 1 1 x x x x x -7 x x x x x x x x x
LGU-CI LHN LHE M 0004 2006.293 2008.205 0.0 90.0 96 7 x x x x x x x x x x 10 x x x x
LGU-CI LHN LHE M 0005 2008.238 2010.177 0.0 90.0 67 5 x x x x x x x x x x x 15 x x x
LGU-CI LHN LHE M 0006 2010.195 2014.105 0.0 90.0 196 15 x x x x x x x x x x x 13 x x x
LRL-CI LHN LHE M 0007 2006.002 2006.053 0.0 90.0 7 1 x x x x x x x 1 x x x x x x x
LRL-CI LHN LHE M 0008 2006.073 2010.199 0.0 90.0 209 17 x x x x x x x x x 6 x x x x x
LRL-CI LHN LHE M 0009 2010.224 2010.246 0.0 90.0 4 1 x x x x x x x -1 x x x x x x x
LRL-CI LHN LHE M 0010 2010.272 2015.351 0.0 90.0 266 10 x x x x x x x x x 7 x x x x x
MLAC-CI LHN LHE M 0005 2006.002 2006.198 0.0 90.0 22 0 x x x x x x x x x x x x x x x
MLAC-CI LHN LHE M 0007 2006.232 2008.273 0.0 90.0 112 6 x x x x x x x 1 x x x x x x x
MLAC-CI LHN LHE M 0008 2008.293 2010.177 0.0 90.0 80 5 x x x x x x x x 4 x x x x x x
MLAC-CI LHN LHE M 0009 2010.195 2015.351 0.0 90.0 277 27 x x x x x x x x 2 x x x x x x
MPM-CI LHN LHE M 0006 2006.002 2010.075 0.0 90.0 197 20 x x x x x x x -1 x x x x x x x
MPM-CI LHN LHE M 0007 2010.079 2015.351 0.0 90.0 267 32 x x x x x x x 0 x x x x x x x
MPP-CI LHN LHE M 0002 2006.002 2007.164 0.0 90.0 54 4 x x x x x -7 x x x x x x x x x
MPP-CI LHN LHE M 0003 2007.175 2011.013 0.0 90.0 157 6 x x x x -8 x x x x x x x x x x
MPP-CI LHN LHE M 0004 2011.018 2015.351 0.0 90.0 253 10 x x x x x x x 0 x x x x x x x
MUR-CI LHN LHE M 0001 2006.002 2009.108 0.0 90.0 154 15 x x x x x x x x 4 x x x x x x
MUR-CI LHN LHE M 0002 2009.136 2010.210 0.0 90.0 71 8 x x x x x x x x 3 x x x x x x
MUR-CI LHN LHE M 0003 2010.216 2011.261 0.0 90.0 63 3 x x x x x x x x 2 x x x x x x
MUR-CI LHN LHE M 0004 2011.287 2013.274 0.0 90.0 93 5 x x x x x x x x x 6 x x x x x
MUR-CI LHN LHE M 0005 2013.285 2015.351 0.0 90.0 120 6 x x x x x x x -1 x x x x x x x
NEE2-CI LHN LHE M 0001 2006.219 2007.343 0.0 90.0 62 3 x x x x x -7 x x x x x x x x x
NEE2-CI LHN LHE M 0003 2008.015 2010.298 0.0 90.0 114 8 x x x x x x x 0 x x x x x x x
NEE2-CI LHN LHE M 0004 2010.334 2013.188 0.0 90.0 127 23 x x x x x x x 0 x x x x x x x
NEE2-CI LHN LHE M 0005 2013.225 2015.351 0.0 90.0 127 21 x x x x x x x 0 x x x x x x x
NEE-CI LHN LHE M 0011 2006.002 2006.198 0.0 90.0 21 2 x x x x x x -4 x x x x x x x x
OSI-CI LHN LHE M 0003 2006.002 2010.089 0.0 90.0 188 25 x x x x x x x x 2 x x x x x x
OSI-CI LHN LHE M 0004 2010.094 2012.249 0.0 90.0 125 11 x x x x x x x -1 x x x x x x x
OSI-CI LHN LHE M 0005 2012.270 2015.351 0.0 90.0 173 22 x x x x x x x 1 x x x x x x x
PASC-CI LHN-00 LHE-00 M 0003 2008.252 2009.245 0.0 90.0 37 0 x x x x x x x x x x x x x x x
PASC-CI LHN-00 LHE-00 M 0004 2009.272 2010.075 0.0 90.0 33 0 x x x x x x x x x x x x x x x
PASC-CI LHN-00 LHE-00 M 0005 2010.079 2011.287 0.0 90.0 87 0 x x x x x x x x x x x x x x x
PASC-CI LHN-00 LHE-00 M 0007 2011.294 2011.326 0.0 90.0 5 1 x x x x x x x x x x x x x 24 x
PASC-CI LHN-00 LHE-00 M 0008 2011.345 2012.069 0.0 90.0 11 2 x x x x x x x x x 7 x x x x x
PASC-CI LHN-00 LHE-00 M 0009 2012.074 2013.134 0.0 90.0 56 9 x x x x x x x x x 7 x x x x x
PASC-CI LHN-00 LHE-00 M 0010 2013.143 2015.351 0.0 90.0 138 34 x x x x x x -2 x x x x x x x x
PASC-CI LHN-10 LHE-10 M 0001 2008.252 2015.351 0.0 90.0 368 56 x x x x x x -3 x x x x x x x x
PDM-CI LHN LHE M 0005 2006.002 2007.051 0.0 90.0 44 2 x x x x x x -4 x x x x x x x x
PDM-CI LHN LHE M 0006 2007.084 2007.333 0.0 90.0 46 6 x x x x x -5 x x x x x x x x x
PDM-CI LHN LHE M 0007 2008.039 2008.329 0.0 90.0 41 4 x x x x x x x -1 x x x x x x x
PDM-CI LHN LHE M 0008 2009.003 2011.052 0.0 90.0 108 18 x x x x x x x -1 x x x x x x x
PDM-CI LHN LHE M 0009 2011.065 2011.175 0.0 90.0 20 2 x x x x -8 x x x x x x x x x x
PDM-CI LHN LHE M 0010 2011.210 2013.298 0.0 90.0 114 17 x x x x x x x 1 x x x x x x x
PDM-CI LHN LHE M 0011 2013.304 2015.351 0.0 90.0 108 12 x x x x x x x x 4 x x x x x x
RCT-CI LHN LHE M 0003 2006.002 2006.148 0.0 90.0 19 0 x x x x x x x x x x x x x x x
RCT-CI LHN LHE M 0004 2006.165 2008.255 0.0 90.0 115 5 x x x x x -5 x x x x x x x x x
RCT-CI LHN LHE M 0005 2008.273 2012.119 0.0 90.0 184 3 x x x x x x x x 2 x x x x x x
RRX-CI LHN LHE M 0005 2006.002 2009.108 0.0 90.0 154 6 x x x x x -5 x x x x x x x x x
RRX-CI LHN LHE M 0006 2009.136 2010.298 0.0 90.0 82 6 x x x x x x x -1 x x x x x x x
RRX-CI LHN LHE M 0007 2011.009 2013.274 0.0 90.0 141 10 x x x x x x -2 x x x x x x x x
RRX-CI LHN LHE M 0008 2013.285 2013.289 180.0 270.0 3 0 x x x x x x x x x x x x x x x
RRX-CI LHN LHE M 0009 2013.292 2015.351 0.0 90.0 117 9 x x x x x x -2 x x x x x x x x
SBC-CI LHN LHE M 0004 2006.002 2007.094 0.0 90.0 52 5 x x x x x x x 0 x x x x x x x
SBC-CI LHN LHE M 0005 2007.126 2007.354 0.0 90.0 38 2 x x x x x x -2 x x x x x x x x
SBC-CI LHN LHE M 0006 2008.015 2010.177 0.0 90.0 120 6 x x x x x x x x x 7 x x x x x
SBC-CI LHN LHE M 0007 2010.195 2015.343 0.0 90.0 282 18 x x x x x x x 0 x x x x x x x
SCI2-CI LHN LHE M 0002 2006.002 2007.232 0.0 90.0 66 3 x x x x x x x x x x x x 17 x x
SCI2-CI LHN LHE M 0003 2007.245 2015.351 0.0 90.0 436 8 x x x x x x x x x x x x x 25 x
SCZ2-CI LHN LHE M 0002 2006.002 2006.033 0.0 90.0 6 0 x x x x x x x x x x x x x x x
SCZ2-CI LHN LHE M 0003 2006.053 2008.107 0.0 90.0 106 5 x x x x x x x 0 x x x x x x x
SCZ2-CI LHN LHE M 0004 2008.115 2009.328 0.0 90.0 70 4 x x x x x x -3 x x x x x x x x
SCZ2-CI LHN LHE M 0005 2010.003 2011.018 0.0 90.0 60 5 x x x x x x x x x 6 x x x x x
SCZ2-CI LHN LHE M 0006 2011.038 2012.321 0.0 90.0 91 12 x x x x x x x x 2 x x x x x x
SCZ2-CI LHN LHE M 0007 2013.030 2015.341 0.0 90.0 148 8 x x x x x x x 0 x x x x x x x
SDP-CI LHN LHE M 0004 2006.002 2006.033 0.0 90.0 6 0 x x x x x x x x x x x x x x x
SDP-CI LHN LHE M 0005 2006.053 2006.219 0.0 90.0 17 0 x x x x x x x x x x x x x x x
SHO-CI LHN LHE M 0005 2006.002 2009.328 0.0 90.0 185 19 x x x x x x x 0 x x x x x x x
SHO-CI LHN LHE M 0006 2010.003 2011.045 0.0 90.0 61 5 x x x x x x -3 x x x x x x x x
SHO-CI LHN LHE M 0007 2011.052 2015.351 0.0 90.0 251 26 x x x x x x x x 2 x x x x x x
SMM-CI LHN LHE M 0003 2006.002 2007.214 0.0 90.0 60 5 x x x x x x x -1 x x x x x x x
SMM-CI LHN LHE M 0004 2007.220 2010.225 0.0 90.0 169 8 x x x x x x x 0 x x x x x x x
SMM-CI LHN LHE M 0005 2010.246 2012.057 0.0 90.0 73 1 x x x x x x x x 2 x x x x x x
SMM-CI LHN LHE M 0006 2012.063 2015.343 0.0 90.0 197 8 x x x x x x x 1 x x x x x x x
SNCC-CI LHN LHE M 0004 2006.090 2010.103 0.0 90.0 120 5 x x x x x -6 x x x x x x x x x
SNCC-CI LHN LHE M 0005 2010.336 2012.210 180.0 90.0 83 5 x x x x x x x x x 7 x x x x x
SNCC-CI LHN LHE M 0006 2012.224 2015.351 0.0 90.0 160 2 x x x x -9 x x x x x x x x x x
SWS-CI LHN LHE M 0003 2006.002 2009.148 0.0 90.0 156 4 x x x x -8 x x x x x x x x x x
SWS-CI LHN LHE M 0004 2009.174 2010.129 0.0 90.0 55 1 x x x x x x x x x 5 x x x x x
SWS-CI LHN LHE M 0005 2010.147 2015.351 0.0 90.0 289 39 x x x x x x x 0 x x x x x x x
TIN-CI LHN LHE M 0005 2006.002 2008.293 0.0 90.0 138 7 x x x x x x x x 4 x x x x x x
TIN-CI LHN LHE M 0006 2008.329 2008.344 0.0 90.0 2 0 x x x x x x x x x x x x x x x
TIN-CI LHN LHE M 0007 2009.003 2010.177 0.0 90.0 74 5 x x x x x x x x x 7 x x x x x
TIN-CI LHN LHE M 0008 2010.195 2015.351 0.0 90.0 282 15 x x x x x x x x x x 8 x x x x
TUQ-CI LHN LHE M 0004 2006.002 2007.304 0.0 90.0 83 6 x x x x -9 x x x x x x x x x x
TUQ-CI LHN LHE M 0005 2007.314 2008.187 0.0 90.0 43 1 x x x x x x x -1 x x x x x x x
TUQ-CI LHN LHE M 0006 2008.201 2009.196 0.0 90.0 32 2 x x x x x -5 x x x x x x x x x
TUQ-CI LHN LHE M 0007 2009.215 2010.177 0.0 90.0 59 3 x x x x x -5 x x x x x x x x x
TUQ-CI LHN LHE M 0008 2010.195 2013.274 0.0 90.0 165 14 x x x x x x -4 x x x x x x x x
TUQ-CI LHN LHE M 0009 2013.285 2015.351 0.0 90.0 115 7 x x x x x x x -1 x x x x x x x
VES-CI LHN LHE M 0005 2006.002 2009.148 0.0 90.0 156 8 x x x x x -5 x x x x x x x x x
VES-CI LHN LHE M 0006 2009.174 2009.328 0.0 90.0 29 0 x x x x x x x x x x x x x x x
VES-CI LHN LHE M 0008 2010.003 2010.272 0.0 90.0 49 1 x x x x x x x x 3 x x x x x x
VES-CI LHN LHE M 0009 2010.294 2013.298 0.0 90.0 149 6 x x x x x x x -1 x x x x x x x
VES-CI LHN LHE M 0010 2013.304 2015.351 0.0 90.0 114 8 x x x x x x x x x x 8 x x x x
VOG-CI LHN LHE M 0002 2013.030 2015.351 0.0 90.0 161 16 x x x x -8 x x x x x x x x x x