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 S 0001 1999.012 2006.323 5.6 95.6 861 26 x x x x x x x x x 7 x x x x x
AIS-G LHN-00 LHE-00 S 0002 2006.333 2012.334 5.6 95.6 958 27 x x x x x x x 1 x x x x x x x
AIS-G LHN-00 LHE-00 S 0004 2013.143 2015.149 5.6 95.6 267 9 x x x x x x x x x 6 x x x x x
AIS-G LHN-10 LHE-10 S 0001 2009.250 2013.091 5.6 95.6 501 15 x x x x x x x -1 x x x x x x x
ATD-G LHN LHE S 0001 1993.189 2005.106 0.0 90.0 1459 91 x x x x x x x x 3 x x x x x x
ATD-G LHN-00 LHE-00 S 0001 2011.152 2015.149 0.0 90.0 536 45 x x x x x x x 1 x x x x x x x
CAN-G LHN LHE S 0001 1989.213 2006.333 0.0 90.0 1980 664 x x x x x x x 1 x x x x x x x
CAN-G LHN-00 LHE-00 S 0001 2007.008 2014.311 0.0 90.0 1247 499 x x x x x x x 0 x x x x x x x
CAN-G LHN-00 LHE-00 S 0003 2014.354 2015.149 0.0 90.0 61 29 x x x x x x x 0 x x x x x x x
CLF-G LHN-00 LHE-00 S 0001 2008.252 2015.149 0.0 90.0 1006 108 x x x x x x -2 x x x x x x x x
COYC-G LHN-00 LHE-00 S 0001 2011.134 2012.057 0.0 90.0 108 3 x x x x -10 x x x x x x x x x x
COYC-G LHN-00 LHE-00 S 0002 2012.074 2014.201 0.0 90.0 253 36 x x x x x x -3 x x x x x x x x
COYC-G LHN-10 LHE-10 S 0001 2012.185 2014.201 0.0 90.0 211 22 x x x x x x -3 x x x x x x x x
CRZF-G LHN LHE S 0003 1993.343 1993.344 0.0 90.0 3 0 x x x x x x x x x x x x x x x
CRZF-G LHN LHE S 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 S 0005 1994.073 1998.282 0.0 90.0 619 59 x x x x x x x 0 x x x x x x x
CRZF-G LHN-00 LHE-00 S 0001 1999.012 2012.081 0.0 90.0 1835 175 x x x x x x x 1 x x x x x x x
CRZF-G LHN-00 LHE-00 S 0002 2014.101 2015.149 0.0 90.0 168 12 x x x x x x x x 3 x x x x x x
CRZF-G LHN-10 LHE-10 S 0001 2009.071 2014.075 0.0 90.0 734 59 x x x x x x x x 2 x x x x x x
CRZF-G LHN-10 LHE-10 S 0002 2014.076 2014.076 90.0 90.0 1 0 x x x x x x x x x x x x x x x
DRV-G LHN LHE S 0003 1991.025 1998.361 0.0 90.0 1017 80 x x x x x x x -1 x x x x x x x
DRV-G LHN-00 LHE-00 S 0001 1999.012 2002.351 0.0 90.0 481 56 x x x x x x -2 x x x x x x x x
DRV-G LHN-00 LHE-00 S 0002 2002.352 2010.036 0.0 90.0 1041 107 x x x x x x x 0 x x x x x x x
DRV-G LHN-00 LHE-00 S 0003 2010.038 2012.304 0.0 90.0 429 81 x x x x x x x x x x x x x x x
ECH-G LH1 LH2 S 0001 1997.133 1999.250 90.0 0.0 255 39 x x x x x x x 0 x x x x x x x
ECH-G LHN LHE S 0001 1990.316 1997.131 0.0 90.0 786 129 x x x x x x x x 2 x x x x x x
ECH-G LHN LHE S 0003 1999.260 2002.286 0.0 90.0 359 39 x x x x x x x 0 x x x x x x x
ECH-G LHN-00 LHE-00 S 0001 2002.145 2012.356 0.0 90.0 1541 256 x x x x x x x 0 x x x x x x x
ECH-G LHN-10 LHE-10 S 0001 2007.025 2012.356 0.0 90.0 914 139 x x x x x x x -1 x x x x x x x
EVO-G LHN LHE S 0001 1996.040 1997.123 0.0 90.0 117 2 x x x x x x x x x x x x x x x
FDF-G LHN LHE S 0001 1998.333 2002.330 0.0 90.0 481 26 x x x x x x x 1 x x x x x x x
FDF-G LHN-00 LHE-00 S 0001 2002.344 2004.327 0.0 90.0 213 12 x x x x x x x 1 x x x x x x x
FDF-G LHN-00 LHE-00 S 0002 2004.333 2006.323 0.0 90.0 263 24 x x x x x x x 1 x x x x x x x
FDF-G LHN-00 LHE-00 S 0003 2006.333 2009.157 0.0 90.0 421 21 x x x x x x x x 2 x x x x x x
FDF-G LHN-00 LHE-00 S 0005 2009.193 2015.149 0.0 90.0 915 78 x x x x x x x 1 x x x x x x x
FOMA-G LHN-00 LHE-00 S 0001 2008.245 2014.336 0.0 90.0 706 65 x x x x x x x 1 x x x x x x x
GRC-G LHN-00 LHE-00 S 0001 2000.177 2002.351 0.0 90.0 249 0 x x x x x x x x x x x x x x x
HDC-G LHN LHE S 0001 1997.068 2002.091 0.0 90.0 580 7 x x x x x x x x 2 x x x x x x
HDC-G LHN LHE S 0002 2002.097 2008.280 0.0 90.0 880 57 x x x x x x -2 x x x x x x x x
HDC-G LHN-00 LHE-00 S 0001 2008.296 2015.149 0.0 90.0 945 71 x x x x x x x x 4 x x x x x x
HYB-G LHN LHE S 0001 1989.035 2007.273 0.0 90.0 2109 375 x x x x x x x x 2 x x x x x x
INU-G LHN LHE S 0001 1988.157 2007.175 0.0 90.0 2084 497 x x x x x x x x 4 x x x x x x
INU-G LHN-00 LHE-00 S 0001 2008.001 2015.149 0.0 90.0 1101 340 x x x x x x x x x x x 11 x x x
IVI-G LHN-00 LHE-00 S 0001 2011.257 2014.253 0.0 90.0 423 81 x x x x x x x -1 x x x x x x x
KIP-G LH1-00 LH2-00 S 0003 2011.001 2011.305 0.0 90.0 158 55 x x x x x x x x 2 x x x x x x
KIP-G LH1-00 LH2-00 S 0004 2011.306 2011.315 0.0 90.0 4 0 x x x x x x x x x x x x x x x
KIP-G LH1-00 LH2-00 S 0005 2011.318 2012.057 0.0 90.0 32 5 x x x x x x x 1 x x x x x x x
KIP-G LH1-10 LH2-10 S 0001 2011.001 2011.315 0.0 90.0 162 64 x x x x x x x 1 x x x x x x x
KIP-G LH1-10 LH2-10 S 0002 2011.318 2012.081 0.0 90.0 42 16 x x x x x x -2 x x x x x x x x
KIP-G LH1-10 LH2-10 S 0003 2012.085 2015.149 0.0 90.0 458 146 x x x x x x x -1 x x x x x x x
KIP-G LHN LHE S 0001 1988.155 2004.062 0.0 90.0 1650 482 x x x x x x x 1 x x x x x x x
KIP-G LHN-00 LHE-00 S 0001 2004.068 2006.142 0.0 90.0 283 92 x x x x x x x 1 x x x x x x x
KIP-G LHN-00 LHE-00 S 0002 2006.146 2009.196 0.0 90.0 458 111 x x x x x x x 1 x x x x x x x
KIP-G LHN-00 LHE-00 S 0003 2009.214 2010.228 0.0 90.0 194 33 x x x x x x x 0 x x x x x x x
KIP-G LHN-10 LHE-10 S 0001 2004.068 2009.196 0.0 90.0 716 200 x x x x x x x 1 x x x x x x x
KIP-G LHN-10 LHE-10 S 0002 2009.214 2010.228 0.0 90.0 194 29 x x x x x x x 0 x x x x x x x
KOG-G LHN LHE S 0001 1994.185 1999.352 0.0 90.0 687 36 x x x x x x x x 3 x x x x x x
KOG-G LHN LHE S 0002 1999.353 1999.353 90.0 90.0 1 0 x x x x x x x x x x x x x x x
MBO-G LHN LHE S 0001 2000.056 2000.363 0.0 90.0 90 0 x x x x x x x x x x x x x x x
MBO-G LHN-00 LHE-00 S 0001 2002.311 2012.119 0.0 90.0 1279 96 x x x x x x -4 x x x x x x x x
MBO-G LHN-00 LHE-00 S 0002 2014.032 2015.149 0.0 90.0 191 12 x x x x x x -4 x x x x x x x x
MBO-G LHN-10 LHE-10 S 0002 2014.049 2015.142 0.0 90.0 195 13 x x x x -10 x x x x x x x x x x
MPG-G LHN-00 LHE-00 S 0001 2012.093 2015.149 0.0 90.0 429 54 x x x x x x x -1 x x x x x x x
NOUC-G LHN LHE S 0002 1992.309 2012.087 0.0 90.0 2329 393 x x x x x x x 1 x x x x x x x
NOUC-G LHN-00 LHE-00 S 0001 2012.135 2015.149 0.0 90.0 379 115 x x x x x x x x 2 x x x x x x
PAF-G LHN LHE S 0005 1993.004 1994.060 0.0 90.0 111 14 x x x x x x -3 x x x x x x x x
PAF-G LHN LHE S 0007 1994.318 1996.091 0.0 90.0 193 16 x x x x x x -3 x x x x x x x x
PAF-G LHN LHE S 0008 1996.107 1998.361 0.0 90.0 300 48 x x x x x x x 0 x x x x x x x
PAF-G LHN-00 LHE-00 S 0001 1999.012 2012.210 0.0 90.0 1893 258 x x x x x x -2 x x x x x x x x
PAF-G LHN-10 LHE-10 S 0001 2007.025 2012.210 0.0 90.0 891 104 x x x x x x x -1 x x x x x x x
PAF-G LHN-10 LHE-10 S 0002 2012.215 2012.356 90.0 90.0 57 9 x x x x x x x x x x x x x x 88
PEL-G LH1 LH2 S 0001 1999.012 2008.345 6.4 96.4 1196 24 x x x x x x x 0 x x x x x x x
PEL-G LHN-00 LHE-00 S 0001 2011.069 2012.037 0.0 90.0 135 15 x x x x x x -4 x x x x x x x x
PEL-G LHN-00 LHE-00 S 0002 2012.069 2012.149 0.0 90.0 38 5 x x x x x x x x 2 x x x x x x
PEL-G LHN-00 LHE-00 S 0003 2012.154 2015.118 0.0 90.0 413 48 x x x x x x x 0 x x x x x x x
PPT-G LH1 LH2 S 0001 1991.285 2009.078 5.0 95.0 2204 364 x x x x x x -2 x x x x x x x x
PPTF-G LHN-00 LHE-00 S 0001 2009.116 2015.149 0.0 90.0 904 177 x x x x x x x 0 x x x x x x x
PVC-G LH1 LH2 S 0002 1995.128 1998.274 345.9 75.9 333 40 x x x x x x x 0 x x x x x x x
PVC-G LH1 LH2 S 0003 1998.281 2004.087 345.9 75.9 618 83 x x x x x x x x 2 x x x x x x
RER-G LHN LHE S 0001 1991.015 2001.045 0.0 90.0 1033 99 x x x x x x -2 x x x x x x x x
RER-G LHN LHE S 0002 2001.055 2003.041 0.0 90.0 163 33 x x x x x x x 0 x x x x x x x
RER-G LHN-00 LHE-00 S 0001 2004.278 2006.299 0.0 90.0 216 70 x x x x x x x 0 x x x x x x x
RER-G LHN-00 LHE-00 S 0002 2006.310 2010.247 0.0 90.0 609 59 x x x x x x -2 x x x x x x x x
RER-G LHN-00 LHE-00 S 0004 2010.269 2015.149 0.0 90.0 689 171 x x x x x x x 0 x x x x x x x
RODM-G LHN-00 LHE-00 S 0001 2010.335 2014.230 0.0 90.0 479 6 x x x x x x -2 x x x x x x x x
SANVU-G LHN-00 LHE-00 S 0001 2011.305 2012.356 0.0 90.0 124 40 x x x x x x -2 x x x x x x x x
SCZ-G LHN LHE S 0001 1991.281 2012.356 0.0 90.0 2735 548 x x x x x x -4 x x x x x x x x
SEY-G LHN LHE S 0001 1990.271 1994.025 0.0 90.0 279 54 x x x x x x x -1 x x x x x x x
SPB-G LHN LHE S 0001 1996.170 2004.289 0.0 90.0 819 65 x x x x x x x 0 x x x x x x x
SPB-G LHN-00 LHE-00 S 0001 2006.310 2010.169 0.0 90.0 475 39 x x x x x x x 1 x x x x x x x
SPB-G LHN-00 LHE-00 S 0003 2011.347 2015.149 0.0 90.0 474 60 x x x x x x x 0 x x x x x x x
SSB-G LH1-00 LHE-00 S 0001 2004.280 2005.141 180.0 90.0 93 8 x x x x x x x x 2 x x x x x x
SSB-G LHN LHE S 0001 1988.251 1988.343 0.0 90.0 21 2 x x x x x x x x x x 8 x x x x
SSB-G LHN LHE S 0002 1988.348 1989.070 0.0 90.0 15 0 x x x x x x x x x x x x x x x
SSB-G LHN LHE S 0003 1989.076 1990.041 0.0 90.0 98 9 x x x x x x x 0 x x x x x x x
SSB-G LHN LHE S 0004 1990.142 1994.011 0.0 90.0 397 58 x x x x x x x 1 x x x x x x x
SSB-G LHN LHE S 0005 1994.017 1995.098 0.0 90.0 161 20 x x x x x x x 0 x x x x x x x
SSB-G LHN LHE S 0006 1995.103 1995.192 0.0 90.0 46 3 x x x x x -5 x x x x x x x x x
SSB-G LHN LHE S 0007 1995.193 1995.193 0.0 90.0 1 0 x x x x x x x x x x x x x x x
SSB-G LHN LHE S 0008 1995.207 2004.255 0.0 90.0 1106 80 x x x x x x x x 2 x x x x x x
SSB-G LHN-00 LHE-00 S 0002 2005.153 2005.288 0.0 90.0 41 12 x x x x x x x x 3 x x x x x x
SSB-G LHN-00 LHE-00 S 0003 2005.292 2007.212 0.0 90.0 235 40 x x x x x x x x 2 x x x x x x
SSB-G LHN-00 LHE-00 S 0004 2007.213 2009.019 0.0 90.0 270 38 x x x x x x x 1 x x x x x x x
SSB-G LHN-00 LHE-00 S 0006 2009.049 2015.118 0.0 90.0 864 195 x x x x x x x 1 x x x x x x x
SSB-G LHN-10 LHE-10 S 0001 2006.002 2007.212 0.0 90.0 214 36 x x x x x x x x 4 x x x x x x
SSB-G LHN-10 LHE-10 S 0003 2009.042 2009.046 0.0 90.0 6 1 x x x x x x -2 x x x x x x x x
SSB-G LHN-10 LHE-10 S 0005 2011.099 2015.118 0.0 90.0 539 83 x x x x x x x 0 x x x x x x x
SSB2-G LHN LHE S 0001 1992.013 1993.163 0.0 90.0 147 19 x x x x x x x 0 x x x x x x x
SSB3-G LHN LHE S 0001 1993.126 1993.163 0.0 90.0 21 4 x x x x -8 x x x x x x x x x x
TAM-G LHN LHE S 0001 1990.071 2006.341 0.0 90.0 1891 310 x x x x x x -2 x x x x x x x x
TAM-G LHN-00 LHE-00 S 0001 2006.356 2015.116 0.0 90.0 1297 253 x x x x x x -3 x x x x x x x x
TRIS-G LHN-10 LHE-10 S 0001 2004.190 2014.267 270.0 0.0 1126 56 x x x x x x x -1 x x x x x x x
UNM-G LHN LHE S 0001 1990.159 2008.152 0.0 90.0 2208 270 x x x x x x -2 x x x x x x x x
UNM-G LHN LHE S 0002 2008.153 2008.153 90.0 90.0 1 0 x x x x x x x x x x x x x x x
UNM-G LHN-00 LHE-00 S 0001 2008.217 2013.041 0.0 90.0 693 99 x x x x x x x 0 x x x x x x x
UNM-G LHN-00 LHE-00 S 0002 2013.053 2015.149 0.0 90.0 226 35 x x x x x x -2 x x x x x x x x
WUS-G LHN LHE S 0001 1988.311 2002.050 0.0 90.0 1222 238 x x x x x x x x 2 x x x x x x
WUS-G LHN-00 LHE-00 S 0001 2004.289 2006.123 0.0 90.0 39 4 x x x x x x x x x x x x x x x