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
AIS-G LHN-00 LHE-00 M 0001 1999.019 2006.319 5.6 95.6 275 11 x x x x x x x x 4 x x x x x x
AIS-G LHN-00 LHE-00 M 0002 2006.360 2012.321 5.6 95.6 294 15 x x x x x x x 1 x x x x x x x
AIS-G LHN-00 LHE-00 M 0004 2013.143 2015.149 5.6 95.6 93 2 x x x x x x x x x x 9 x x x x
AIS-G LHN-10 LHE-10 M 0001 2009.272 2012.356 5.6 95.6 167 4 x x x x x x -2 x x x x x x x x
ATD-G LHN LHE M 0001 1993.192 2005.101 0.0 90.0 469 50 x x x x x x x 0 x x x x x x x
ATD-G LHN-00 LHE-00 M 0001 2011.171 2015.149 0.0 90.0 189 35 x x x x x x x -1 x x x x x x x
CAN-G LHN LHE M 0001 1989.232 2006.319 0.0 90.0 612 248 x x x x x x x 0 x x x x x x x
CAN-G LHN-00 LHE-00 M 0001 2007.013 2014.311 0.0 90.0 403 183 x x x x x x x 0 x x x x x x x
CAN-G LHN-00 LHE-00 M 0003 2015.007 2015.149 0.0 90.0 22 12 x x x x x x x x 2 x x x x x x
CLF-G LHN-00 LHE-00 M 0001 2008.252 2015.149 0.0 90.0 337 58 x x x x x x x -1 x x x x x x x
COYC-G LHN-00 LHE-00 M 0001 2011.135 2012.057 0.0 90.0 36 2 x x x x x x x 1 x x x x x x x
COYC-G LHN-00 LHE-00 M 0002 2012.074 2014.192 0.0 90.0 86 20 x x x x x x x 1 x x x x x x x
COYC-G LHN-10 LHE-10 M 0001 2012.208 2014.192 0.0 90.0 75 7 x x x x x x x 1 x x x x x x x
CRZF-G LHN LHE M 0003 1993.343 1993.343 0.0 90.0 2 0 x x x x x x x x x x x x x x x
CRZF-G LHN LHE M 0004 1994.068 1994.068 0.0 90.0 1 0 x x x x x x x x x x x x x x x
CRZF-G LHN LHE M 0005 1994.073 1998.271 0.0 90.0 208 11 x x x x x x -2 x x x x x x x x
CRZF-G LHN-00 LHE-00 M 0001 1999.019 2012.081 0.0 90.0 575 39 x x x x x x x 0 x x x x x x x
CRZF-G LHN-00 LHE-00 M 0002 2014.101 2015.149 0.0 90.0 61 4 x x x x x x x 0 x x x x x x x
CRZF-G LHN-10 LHE-10 M 0001 2009.078 2014.075 0.0 90.0 247 13 x x x x x x x 1 x x x x x x x
DRV-G LHN LHE M 0003 1991.031 1998.361 0.0 90.0 334 16 x x x x x x x 1 x x x x x x x
DRV-G LHN-00 LHE-00 M 0001 1999.019 2002.346 0.0 90.0 145 11 x x x x x x x x 3 x x x x x x
DRV-G LHN-00 LHE-00 M 0002 2003.004 2010.012 0.0 90.0 322 25 x x x x x x x 1 x x x x x x x
DRV-G LHN-00 LHE-00 M 0003 2010.049 2012.302 0.0 90.0 143 9 x x x x x x x x x x x x x x x
ECH-G LH1 LH2 M 0001 1997.141 1999.234 90.0 0.0 81 11 x x x x x x -4 x x x x x x x x
ECH-G LHN LHE M 0001 1990.319 1997.131 0.0 90.0 249 52 x x x x x x x 0 x x x x x x x
ECH-G LHN LHE M 0003 1999.263 2002.285 0.0 90.0 110 16 x x x x x x -3 x x x x x x x x
ECH-G LHN-00 LHE-00 M 0001 2002.164 2012.356 0.0 90.0 480 66 x x x x x x x 0 x x x x x x x
ECH-G LHN-10 LHE-10 M 0001 2007.030 2012.356 0.0 90.0 286 26 x x x x x x -3 x x x x x x x x
EVO-G LHN LHE M 0001 1996.047 1997.123 0.0 90.0 45 2 x x x x x x x x x x x x x x x
FDF-G LHN LHE M 0001 1998.333 2002.321 0.0 90.0 147 22 x x x x x x x -1 x x x x x x x
FDF-G LHN-00 LHE-00 M 0001 2002.346 2004.327 0.0 90.0 76 14 x x x x x x x 1 x x x x x x x
FDF-G LHN-00 LHE-00 M 0002 2004.333 2006.319 0.0 90.0 83 7 x x x x x x x -1 x x x x x x x
FDF-G LHN-00 LHE-00 M 0003 2006.360 2009.148 0.0 90.0 119 10 x x x x x x -2 x x x x x x x x
FDF-G LHN-00 LHE-00 M 0005 2009.196 2015.149 0.0 90.0 314 29 x x x x x x x -1 x x x x x x x
FOMA-G LHN-00 LHE-00 M 0001 2008.252 2014.336 0.0 90.0 238 37 x x x x x x x 1 x x x x x x x
GRC-G LHN-00 LHE-00 M 0001 2000.193 2002.346 0.0 90.0 81 0 x x x x x x x x x x x x x x x
HDC-G LHN LHE M 0001 1997.070 2002.090 0.0 90.0 181 2 x x x x x x x x x x x x x x 28
HDC-G LHN LHE M 0002 2002.108 2008.279 0.0 90.0 263 26 x x x x x x x 0 x x x x x x x
HDC-G LHN-00 LHE-00 M 0001 2008.321 2015.149 0.0 90.0 311 25 x x x x x x x 1 x x x x x x x
HYB-G LHN LHE M 0001 1989.041 2007.273 0.0 90.0 659 118 x x x x x x x 0 x x x x x x x
INU-G LHN LHE M 0001 1988.157 2007.175 0.0 90.0 649 185 x x x x x x x x 4 x x x x x x
INU-G LHN-00 LHE-00 M 0001 2008.005 2015.149 0.0 90.0 360 129 x x x x x x x x x x x 12 x x x
IVI-G LHN-00 LHE-00 M 0001 2011.258 2014.236 0.0 90.0 143 43 x x x x x x -2 x x x x x x x x
KIP-G LH1-00 LH2-00 M 0003 2011.001 2011.301 0.0 90.0 54 12 x x x x x x x 0 x x x x x x x
KIP-G LH1-00 LH2-00 M 0004 2011.312 2011.312 0.0 90.0 1 0 x x x x x x x x x x x x x x x
KIP-G LH1-00 LH2-00 M 0005 2011.326 2012.057 0.0 90.0 10 0 x x x x x x x x x x x x x x x
KIP-G LH1-10 LH2-10 M 0001 2011.001 2011.312 0.0 90.0 55 12 x x x x x x x x 2 x x x x x x
KIP-G LH1-10 LH2-10 M 0002 2011.326 2012.081 0.0 90.0 15 2 x x x x x x x 1 x x x x x x x
KIP-G LH1-10 LH2-10 M 0003 2012.085 2015.149 0.0 90.0 159 47 x x x x x x x 0 x x x x x x x
KIP-G LHN LHE M 0001 1988.155 2004.052 0.0 90.0 527 161 x x x x x x x x 2 x x x x x x
KIP-G LHN-00 LHE-00 M 0001 2004.096 2006.142 0.0 90.0 88 26 x x x x x x x x 2 x x x x x x
KIP-G LHN-00 LHE-00 M 0002 2006.148 2009.196 0.0 90.0 129 37 x x x x x x x x 2 x x x x x x
KIP-G LHN-00 LHE-00 M 0003 2009.221 2010.225 0.0 90.0 72 6 x x x x x x x -1 x x x x x x x
KIP-G LHN-10 LHE-10 M 0001 2004.096 2009.196 0.0 90.0 214 34 x x x x x x x 1 x x x x x x x
KIP-G LHN-10 LHE-10 M 0002 2009.221 2010.225 0.0 90.0 72 4 x x x x x x x x 2 x x x x x x
KOG-G LHN LHE M 0001 1994.194 1999.345 0.0 90.0 229 11 x x x x x x x -1 x x x x x x x
MBO-G LHN LHE M 0001 2000.056 2000.355 0.0 90.0 30 0 x x x x x x x x x x x x x x x
MBO-G LHN-00 LHE-00 M 0001 2002.311 2012.119 0.0 90.0 408 34 x x x x x x x 1 x x x x x x x
MBO-G LHN-00 LHE-00 M 0002 2014.038 2015.149 0.0 90.0 64 3 x x x x x x x 0 x x x x x x x
MBO-G LHN-10 LHE-10 M 0002 2014.049 2015.142 0.0 90.0 67 5 x x x x x x -3 x x x x x x x x
MPG-G LHN-00 LHE-00 M 0001 2012.102 2015.149 0.0 90.0 146 18 x x x x x x -3 x x x x x x x x
NOUC-G LHN LHE M 0002 1992.313 2012.085 0.0 90.0 735 87 x x x x x x x x 2 x x x x x x
NOUC-G LHN-00 LHE-00 M 0001 2012.149 2015.149 0.0 90.0 134 39 x x x x x x x 0 x x x x x x x
PAF-G LHN LHE M 0005 1993.010 1994.046 0.0 90.0 35 1 x x x x x x x x 4 x x x x x x
PAF-G LHN LHE M 0007 1994.318 1996.082 0.0 90.0 65 6 x x x x x x x 1 x x x x x x x
PAF-G LHN LHE M 0008 1996.107 1998.361 0.0 90.0 102 15 x x x x x x x x 4 x x x x x x
PAF-G LHN-00 LHE-00 M 0001 1999.019 2012.210 0.0 90.0 586 64 x x x x x x x x 3 x x x x x x
PAF-G LHN-10 LHE-10 M 0001 2007.030 2012.210 0.0 90.0 277 21 x x x x x x x x 2 x x x x x x
PAF-G LHN-10 LHE-10 M 0002 2012.224 2012.356 90.0 90.0 19 5 x x x x x x x x x x x x x x 88
PEL-G LH1 LH2 M 0001 1999.019 2008.344 6.4 96.4 359 11 x x x x x x -4 x x x x x x x x
PEL-G LHN-00 LHE-00 M 0001 2011.069 2012.037 0.0 90.0 42 9 x x x x x x x 0 x x x x x x x
PEL-G LHN-00 LHE-00 M 0002 2012.069 2012.149 0.0 90.0 14 2 x x x x x x x 1 x x x x x x x
PEL-G LHN-00 LHE-00 M 0003 2012.208 2015.116 0.0 90.0 139 42 x x x x x x x 1 x x x x x x x
PPT-G LH1 LH2 M 0001 1991.287 2009.078 5.0 95.0 697 87 x x x x x x x -1 x x x x x x x
PPTF-G LHN-00 LHE-00 M 0001 2009.136 2015.149 0.0 90.0 311 67 x x x x x x x 0 x x x x x x x
PVC-G LH1 LH2 M 0002 1995.133 1998.271 345.9 75.9 122 10 x x x x x x -2 x x x x x x x x
PVC-G LH1 LH2 M 0003 1998.301 2004.052 345.9 75.9 193 23 x x x x x x x x 2 x x x x x x
RER-G LHN LHE M 0001 1991.031 2001.044 0.0 90.0 323 36 x x x x x x -4 x x x x x x x x
RER-G LHN LHE M 0002 2001.055 2003.022 0.0 90.0 48 17 x x x x x x x 0 x x x x x x x
RER-G LHN-00 LHE-00 M 0001 2004.282 2006.293 0.0 90.0 70 24 x x x x x x x -1 x x x x x x x
RER-G LHN-00 LHE-00 M 0002 2006.311 2010.246 0.0 90.0 187 17 x x x x x x x 0 x x x x x x x
RER-G LHN-00 LHE-00 M 0004 2010.272 2015.149 0.0 90.0 237 87 x x x x x x x -1 x x x x x x x
RODM-G LHN-00 LHE-00 M 0001 2010.336 2014.215 0.0 90.0 164 3 x x x x x x -3 x x x x x x x x
SANVU-G LHN-00 LHE-00 M 0001 2011.312 2012.356 0.0 90.0 37 10 x x x x x x x -1 x x x x x x x
SCZ-G LHN LHE M 0001 1991.287 2012.356 0.0 90.0 856 155 x x x x x -7 x x x x x x x x x
SEY-G LHN LHE M 0001 1990.266 1994.021 0.0 90.0 78 17 x x x x x x -3 x x x x x x x x
SPB-G LHN LHE M 0001 1996.173 2004.289 0.0 90.0 261 41 x x x x x x x 1 x x x x x x x
SPB-G LHN-00 LHE-00 M 0001 2006.311 2010.167 0.0 90.0 143 10 x x x x x x x 0 x x x x x x x
SPB-G LHN-00 LHE-00 M 0003 2011.348 2015.149 0.0 90.0 165 39 x x x x x x x 1 x x x x x x x
SSB-G LH1-00 LHE-00 M 0001 2004.282 2005.139 180.0 90.0 35 1 x x x x x x x x 3 x x x x x x
SSB-G LHN LHE M 0001 1988.251 1988.342 0.0 90.0 9 0 x x x x x x x x x x x x x x x
SSB-G LHN LHE M 0002 1989.010 1989.070 0.0 90.0 4 0 x x x x x x x x x x x x x x x
SSB-G LHN LHE M 0003 1989.096 1990.039 0.0 90.0 23 4 x x x x x x x 1 x x x x x x x
SSB-G LHN LHE M 0004 1990.195 1993.284 0.0 90.0 119 23 x x x x x x -2 x x x x x x x x
SSB-G LHN LHE M 0005 1994.017 1995.097 0.0 90.0 50 0 x x x x x x x x x x x x x x x
SSB-G LHN LHE M 0006 1995.107 1995.192 0.0 90.0 23 0 x x x x x x x x x x x x x x x
SSB-G LHN LHE M 0008 1995.226 2004.250 0.0 90.0 353 2 x x x x x x x x x 7 x x x x x
SSB-G LHN-00 LHE-00 M 0002 2005.164 2005.281 0.0 90.0 12 4 x x x x x x -4 x x x x x x x x
SSB-G LHN-00 LHE-00 M 0003 2005.302 2007.207 0.0 90.0 59 13 x x x x x x x x 2 x x x x x x
SSB-G LHN-00 LHE-00 M 0004 2007.213 2009.019 0.0 90.0 87 19 x x x x x x x x 3 x x x x x x
SSB-G LHN-00 LHE-00 M 0006 2009.049 2015.116 0.0 90.0 293 97 x x x x x x x -1 x x x x x x x
SSB-G LHN-10 LHE-10 M 0001 2006.002 2007.207 0.0 90.0 52 7 x x x x x x x x 3 x x x x x x
SSB-G LHN-10 LHE-10 M 0003 2009.042 2009.042 0.0 90.0 1 1 x x x x x -7 x x x x x x x x x
SSB-G LHN-10 LHE-10 M 0005 2011.101 2015.116 0.0 90.0 182 17 x x x x x x x -1 x x x x x x x
SSB2-G LHN LHE M 0001 1992.020 1993.159 0.0 90.0 41 8 x x x x x x x -1 x x x x x x x
SSB3-G LHN LHE M 0001 1993.131 1993.159 0.0 90.0 7 1 x x x x x x -2 x x x x x x x x
TAM-G LHN LHE M 0001 1990.080 2006.319 0.0 90.0 603 202 x x x x x x -2 x x x x x x x x
TAM-G LHN-00 LHE-00 M 0001 2006.360 2015.116 0.0 90.0 416 138 x x x x x x -2 x x x x x x x x
TRIS-G LHN-10 LHE-10 M 0001 2004.197 2014.260 270.0 0.0 376 13 x x x x x x x 0 x x x x x x x
UNM-G LHN LHE M 0001 1990.195 2008.144 0.0 90.0 702 94 x x x x x x x 0 x x x x x x x
UNM-G LHN-00 LHE-00 M 0001 2008.238 2013.040 0.0 90.0 220 24 x x x x x x x 0 x x x x x x x
UNM-G LHN-00 LHE-00 M 0002 2013.059 2015.149 0.0 90.0 78 17 x x x x x x -2 x x x x x x x x
WUS-G LHN LHE M 0001 1988.311 2002.036 0.0 90.0 374 86 x x x x x x x 0 x x x x x x x
WUS-G LHN-00 LHE-00 M 0001 2004.289 2006.123 0.0 90.0 11 3 x x x x x x x x x x x x x x x