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
AIO-MN LHN LHE M 0001 2001.209 2002.311 0.0 90.0 26 1 x x x x x x x x x x 8 x x x x
AIO-MN LHN LHE M 0002 2003.107 2003.361 0.0 90.0 30 0 x x x x x x x x x x x x x x x
AQU-MN LHN LHE M 0001 1990.039 1991.187 0.0 90.0 52 0 x x x x x x x x x x x x x x x
AQU-MN LHN LHE M 0002 1991.220 1995.180 0.0 90.0 113 14 x x x x x x -3 x x x x x x x x
AQU-MN LHN LHE M 0003 1995.240 1996.161 0.0 90.0 29 0 x x x x x x x x x x x x x x x
AQU-MN LHN LHE M 0004 1996.283 1998.030 0.0 90.0 43 12 x x x x x -6 x x x x x x x x x
AQU-MN LHN LHE M 0005 1998.047 1998.361 0.0 90.0 27 1 x x x x x -6 x x x x x x x x x
AQU-MN LHN LHE M 0006 1999.192 1999.234 0.0 90.0 5 1 x x x x x x x x x 6 x x x x x
AQU-MN LHN LHE M 0007 1999.263 2000.222 0.0 90.0 31 9 x x x x x x -4 x x x x x x x x
AQU-MN LHN LHE M 0008 2000.278 2002.116 0.0 90.0 65 6 x x x x x -6 x x x x x x x x x
AQU-MN LHN LHE M 0009 2002.164 2008.015 0.0 90.0 215 37 x x x x x x -2 x x x x x x x x
AQU-MN LHN LHE M 0010 2008.080 2015.149 0.0 90.0 303 56 x x x x x x -3 x x x x x x x x
BGY-MN LHN LHE M 0001 1991.095 1998.123 0.0 90.0 95 5 x x x -14 x x x x x x x x x x x
BNI-MN LHN LHE M 0001 1990.039 1992.136 0.0 90.0 77 3 x x x x x x x x x x 8 x x x x
BNI-MN LHN LHE M 0003 1996.337 1997.123 0.0 90.0 15 0 x x x x x x x x x x x x x x x
BNI-MN LHN LHE M 0004 1997.301 1999.345 0.0 90.0 52 3 x x x x x x x x 3 x x x x x x
BNI-MN LHN LHE M 0006 1999.363 2001.209 0.0 90.0 58 5 x x x x x x x x x 5 x x x x x
BNI-MN LHN LHE M 0007 2001.318 2002.231 0.0 90.0 22 2 x x x x x x x x x 6 x x x x x
BNI-MN LHN LHE M 0008 2002.296 2015.149 0.0 90.0 572 87 x x x x x x x x x 6 x x x x x
CEL-MN LHN LHE M 0001 2003.313 2015.149 0.0 90.0 437 61 x x x x -9 x x x x x x x x x x
CII-MN LHN LHE M 0001 1994.318 1999.137 0.0 90.0 87 0 x x x x x x x x x x x x x x x
CII-MN LHN LHE M 0002 1999.323 2000.063 0.0 90.0 12 0 x x x x x x x x x x x x x x x
CII-MN LHN LHE M 0003 2000.088 2000.323 0.0 90.0 30 2 x x x x x x x 0 x x x x x x x
CII-MN LHN LHE M 0004 2000.330 2001.218 0.0 90.0 24 0 x x x x x x x x x x x x x x x
CII-MN LHN LHE M 0006 2001.346 2005.318 0.0 90.0 132 11 x x x x x x x -1 x x x x x x x
CLTB-MN LHN LHE M 0001 2001.055 2003.208 0.0 90.0 48 1 x x x x x x x x x x 8 x x x x
CLTB-MN LHN LHE M 0003 2004.162 2005.139 0.0 90.0 48 0 x x x x x x x x x x x x x x x
CLTB-MN LHN LHE M 0004 2005.281 2015.149 0.0 90.0 285 2 x x x -14 x x x x x x x x x x x
CUC-MN LHN LHE M 0001 2003.268 2005.139 0.0 90.0 76 7 x x x x x x x x 2 x x x x x x
CUC-MN LHN LHE M 0002 2005.205 2008.063 0.0 90.0 108 15 x x x x x x x x 4 x x x x x x
CUC-MN LHN LHE M 0003 2008.238 2013.045 0.0 90.0 218 37 x x x x x x x x 3 x x x x x x
DIVS-MN LHN LHE M 0001 2005.252 2015.149 0.0 90.0 203 40 x x x x x x x x x 7 x x x x x
GFA-MN LHN LHE M 0001 1990.132 1996.293 0.0 90.0 58 5 x x x x x x x x 2 x x x x x x
IDI-MN LHN LHE M 0002 1996.197 1996.215 0.0 90.0 5 1 x x x x x x x x 2 x x x x x x
IDI-MN LHN LHE M 0003 1998.198 2003.022 0.0 90.0 73 0 x x x x x x x x x x x x x x x
IDI-MN LHN LHE M 0004 2003.107 2015.149 0.0 90.0 463 76 x x x x x x x 0 x x x x x x x
KEG-MN LHN LHE M 0001 1990.364 1999.019 0.0 90.0 270 32 x x x x x x -3 x x x x x x x x
MDT-MN LHN LHE M 0001 1990.165 1998.073 0.0 90.0 87 14 x x x x x x x 1 x x x x x x x
MEB-MN LHN LHE M 0001 1992.146 1993.273 0.0 90.0 38 5 x x x x x x x -1 x x x x x x x
PDG-MN LHN LHE M 0001 2009.003 2009.003 0.0 90.0 3 1 x x x x x -6 x x x x x x x x x
RTC-MN LHN LHE M 0001 2003.076 2015.132 0.0 90.0 342 47 x x x x x x x x 2 x x x x x x
TIP-MN LHN LHE M 0001 2003.264 2004.282 0.0 90.0 26 2 x x x x x x x -1 x x x x x x x
TIP-MN LHN LHE M 0002 2004.307 2008.015 0.0 90.0 150 13 x x x x x x x x 3 x x x x x x
TIP-MN LHN LHE M 0004 2008.039 2015.149 0.0 90.0 324 43 x x x x x x -3 x x x x x x x x
TIR-MN LHN LHE M 0003 2004.307 2015.149 0.0 90.0 409 42 x x x x x x -2 x x x x x x x x
TNV-MN LHN LHE M 0001 1991.067 1995.019 0.0 90.0 15 0 x x x x x x x x x x x x x x x
TNV-MN LHN LHE M 0003 1996.317 1997.339 0.0 90.0 7 0 x x x x x x x x x x x x x x x
TNV-MN LHN LHE M 0005 1998.073 2006.033 0.0 90.0 117 1 x x x x x x x x 2 x x x x x x
TRI-MN LHN LHE M 0001 1996.204 1999.334 0.0 90.0 89 13 x x x x x x x x 4 x x x x x x
TRI-MN LHN LHE M 0003 2004.096 2005.087 0.0 90.0 20 5 x x x x x x x 0 x x x x x x x
TRI-MN LHN LHE M 0004 2005.100 2009.015 0.0 90.0 123 23 x x x x x x -3 x x x x x x x x
TUE-MN LHN LHE M 0001 2001.346 2001.352 0.0 90.0 2 0 x x x x x x x x x x x x x x x
TUE-MN LHN LHE M 0002 2002.346 2015.149 0.0 90.0 556 106 x x x x x x x x 4 x x x x x x
VAE-MN LHN LHE M 0001 2001.209 2002.036 0.0 90.0 16 0 x x x x x x x x x x x x x x x
VAE-MN LHN LHE M 0002 2002.164 2003.361 0.0 90.0 44 0 x x x x x x x x x x x x x x x
VLC-MN LHN LHE M 0001 2001.083 2002.283 0.0 90.0 31 4 x x x x x -5 x x x x x x x x x
VLC-MN LHN LHE M 0002 2002.285 2002.307 0.0 90.0 4 0 x x x x x x x x x x x x x x x
VLC-MN LHN LHE M 0003 2002.311 2003.070 0.0 90.0 10 0 x x x x x x x x x x x x x x x
VLC-MN LHN LHE M 0004 2003.076 2015.149 0.0 90.0 574 131 x x x x x -7 x x x x x x x x x
VSL-MN LHN LHE M 0001 1990.004 1995.211 0.0 90.0 179 32 x x x x x -6 x x x x x x x x x
VSL-MN LHN LHE M 0002 1995.336 1996.249 0.0 90.0 32 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0003 1996.264 2000.198 0.0 90.0 106 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0004 2000.278 2001.154 0.0 90.0 36 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0005 2001.165 2002.064 0.0 90.0 25 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0006 2002.108 2002.108 0.0 90.0 2 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0008 2002.212 2002.231 0.0 90.0 3 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0009 2002.296 2003.233 0.0 90.0 33 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0011 2004.038 2004.052 0.0 90.0 3 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0012 2004.162 2004.210 0.0 90.0 5 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0013 2004.282 2005.101 0.0 90.0 37 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE M 0014 2005.164 2015.149 0.0 90.0 370 0 x x x x x x x x x x x x x x x
VTS-MN LHN LHE M 0001 1996.357 2015.149 0.0 90.0 431 56 x x x x x x -3 x x x x x x x x
WDD-MN LHN LHE M 0001 1996.001 1999.312 0.0 90.0 89 15 x x x x x x x x x x 8 x x x x
WDD-MN LHN LHE M 0002 2000.028 2015.149 0.0 90.0 612 51 x x x x x x x x 4 x x x x x x