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 S 0001 2001.203 2002.316 0.0 90.0 100 5 x x x x x x x x x x 10 x x x x
AIO-MN LHN LHE S 0002 2003.101 2003.363 0.0 90.0 65 1 x x x x x x x x 4 x x x x x x
AQU-MN LHN LHE S 0001 1990.033 1991.187 0.0 90.0 156 9 x x -20 x x x x x x x x x x x x
AQU-MN LHN LHE S 0002 1991.217 1995.193 0.0 90.0 432 25 x x x x x -5 x x x x x x x x x
AQU-MN LHN LHE S 0003 1995.240 1996.161 0.0 90.0 94 2 x x x x x -5 x x x x x x x x x
AQU-MN LHN LHE S 0004 1996.280 1998.034 0.0 90.0 129 22 x x x x x x -2 x x x x x x x x
AQU-MN LHN LHE S 0005 1998.038 1998.361 0.0 90.0 83 13 x x x x x -5 x x x x x x x x x
AQU-MN LHN LHE S 0006 1999.169 1999.240 0.0 90.0 21 3 x x x x x -7 x x x x x x x x x
AQU-MN LHN LHE S 0007 1999.250 2000.222 0.0 90.0 107 17 x x x x x x -4 x x x x x x x x
AQU-MN LHN LHE S 0008 2000.270 2002.148 0.0 90.0 201 22 x x x x x x x -1 x x x x x x x
AQU-MN LHN LHE S 0009 2002.157 2008.015 0.0 90.0 719 81 x x x x x x -3 x x x x x x x x
AQU-MN LHN LHE S 0010 2008.072 2015.149 0.0 90.0 912 112 x x x x x x -3 x x x x x x x x
BGY-MN LHN LHE S 0001 1991.094 1998.123 0.0 90.0 297 18 x x x -12 x x x x x x x x x x x
BNI-MN LHN LHE S 0001 1990.006 1992.136 0.0 90.0 242 5 x x x x x x x x x 5 x x x x x
BNI-MN LHN LHE S 0003 1996.333 1997.123 0.0 90.0 45 2 x x x x x x x x x 6 x x x x x
BNI-MN LHN LHE S 0004 1997.301 1999.345 0.0 90.0 153 8 x x x x x x x x 4 x x x x x x
BNI-MN LHN LHE S 0006 1999.352 2001.225 0.0 90.0 193 5 x x x x x x x x x 7 x x x x x
BNI-MN LHN LHE S 0007 2001.317 2002.232 0.0 90.0 81 8 x x x x x x x x x 5 x x x x x
BNI-MN LHN LHE S 0008 2002.289 2015.149 0.0 90.0 1777 229 x x x x x x x x x x 9 x x x x
CEL-MN LHN LHE S 0001 2003.313 2015.149 0.0 90.0 1293 136 x x x x x -7 x x x x x x x x x
CII-MN LHN LHE S 0001 1994.308 1999.250 0.0 90.0 273 7 x x x x x x -4 x x x x x x x x
CII-MN LHN LHE S 0002 1999.321 2000.072 0.0 90.0 47 1 x x x x -8 x x x x x x x x x x
CII-MN LHN LHE S 0003 2000.088 2000.326 0.0 90.0 97 0 x x x x x x x x x x x x x x x
CII-MN LHN LHE S 0004 2000.328 2001.218 0.0 90.0 64 2 x x x -11 x x x x x x x x x x x
CII-MN LHN LHE S 0006 2001.343 2005.318 0.0 90.0 418 23 x x x x x x -4 x x x x x x x x
CLTB-MN LHN LHE S 0001 2001.045 2003.208 0.0 90.0 155 5 x x x x x x x x x x 10 x x x x
CLTB-MN LHN LHE S 0003 2004.077 2005.141 0.0 90.0 136 2 x x x x x x x x x x x 13 x x x
CLTB-MN LHN LHE S 0004 2005.281 2015.149 0.0 90.0 840 13 x x x x x x x x 2 x x x x x x
CUC-MN LHN LHE S 0001 2003.268 2005.141 0.0 90.0 214 12 x x x x x x x x 3 x x x x x x
CUC-MN LHN LHE S 0002 2005.191 2008.185 0.0 90.0 320 28 x x x x x x x x x 7 x x x x x
CUC-MN LHN LHE S 0003 2008.217 2013.047 0.0 90.0 680 76 x x x x x x x x x 6 x x x x x
DIVS-MN LHN LHE S 0001 2005.215 2015.149 0.0 90.0 691 94 x x x x x x x x x 7 x x x x x
GFA-MN LHN LHE S 0001 1990.128 1996.293 0.0 90.0 180 9 x x x x x x x 1 x x x x x x x
IDI-MN LHN LHE S 0002 1996.197 1996.215 0.0 90.0 11 2 x x x x x x x 0 x x x x x x x
IDI-MN LHN LHE S 0003 1998.198 2003.027 0.0 90.0 254 0 x x x x x x x x x x x x x x x
IDI-MN LHN LHE S 0004 2003.101 2015.149 0.0 90.0 1409 133 x x x x x x -3 x x x x x x x x
KEG-MN LHN LHE S 0001 1990.339 1999.025 0.0 90.0 832 47 x x x x x -6 x x x x x x x x x
MDT-MN LHN LHE S 0001 1990.159 1998.073 0.0 90.0 265 31 x x x x x x x -1 x x x x x x x
MEB-MN LHN LHE S 0001 1992.143 1993.278 0.0 90.0 149 10 x x x x x x x x 3 x x x x x x
PDG-MN LHN LHE S 0001 2009.003 2009.003 0.0 90.0 3 0 x x x x x x x x x x x x x x x
RTC-MN LHN LHE S 0001 2003.076 2015.135 0.0 90.0 1016 108 x x x x x x x x 3 x x x x x x
TIP-MN LHN LHE S 0001 2003.255 2004.272 0.0 90.0 72 5 x x x x x x x 0 x x x x x x x
TIP-MN LHN LHE S 0002 2004.307 2008.035 0.0 90.0 491 49 x x x x x x x x x 5 x x x x x
TIP-MN LHN LHE S 0004 2008.039 2015.149 0.0 90.0 975 119 x x x x x x -3 x x x x x x x x
TIR-MN LHN LHE S 0003 2004.307 2015.149 0.0 90.0 1388 121 x x x x x x -2 x x x x x x x x
TNV-MN LHN LHE S 0001 1991.060 1995.021 0.0 90.0 51 3 x x x x x x x x 2 x x x x x x
TNV-MN LHN LHE S 0003 1996.316 1997.339 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 S 0005 1998.051 2006.034 0.0 90.0 396 8 x x x x x x x x x x 9 x x x x
TRI-MN LHN LHE S 0001 1996.202 1999.334 0.0 90.0 261 44 x x x x x x x 1 x x x x x x x
TRI-MN LHN LHE S 0003 2003.073 2005.097 0.0 90.0 66 14 x x x x x x -2 x x x x x x x x
TRI-MN LHN LHE S 0004 2005.098 2009.015 0.0 90.0 415 66 x x x x x x x -1 x x x x x x x
TUE-MN LHN LHE S 0001 2001.319 2001.352 0.0 90.0 12 2 x x x x x x -2 x x x x x x x x
TUE-MN LHN LHE S 0002 2002.346 2015.149 0.0 90.0 1713 286 x x x x x x x x x 7 x x x x x
VAE-MN LHN LHE S 0001 2001.203 2002.036 0.0 90.0 58 0 x x x x x x x x x x x x x x x
VAE-MN LHN LHE S 0002 2002.145 2003.363 0.0 90.0 124 0 x x x x x x x x x x x x x x x
VLC-MN LHN LHE S 0001 2001.082 2002.283 0.0 90.0 104 8 x x x x x x -2 x x x x x x x x
VLC-MN LHN LHE S 0002 2002.285 2002.307 0.0 90.0 18 0 x x x x x x x x x x x x x x x
VLC-MN LHN LHE S 0003 2002.311 2003.071 0.0 90.0 31 1 x x x x x x x x x 7 x x x x x
VLC-MN LHN LHE S 0004 2003.073 2015.149 0.0 90.0 1749 266 x x x x x -5 x x x x x x x x x
VSL-MN LHN LHE S 0001 1990.004 1995.219 0.0 90.0 545 32 x x x x x -6 x x x x x x x x x
VSL-MN LHN LHE S 0002 1995.336 1996.258 0.0 90.0 84 1 x x x x x x x x 2 x x x x x x
VSL-MN LHN LHE S 0003 1996.264 2000.199 0.0 90.0 358 6 x x x x x x x x x x 9 x x x x
VSL-MN LHN LHE S 0004 2000.272 2001.154 0.0 90.0 94 1 x x x x x x x x x x x x x x x
VSL-MN LHN LHE S 0005 2001.165 2002.098 0.0 90.0 87 4 x x x x x x -3 x x x x x x x x
VSL-MN LHN LHE S 0006 2002.101 2002.108 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 S 0008 2002.200 2002.236 0.0 90.0 11 2 x x x x x -7 x x x x x x x x x
VSL-MN LHN LHE S 0009 2002.295 2003.255 0.0 90.0 104 4 x x x -15 x x x x x x x x x x x
VSL-MN LHN LHE S 0011 2004.038 2004.057 0.0 90.0 7 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE S 0012 2004.162 2004.214 0.0 90.0 16 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE S 0013 2004.282 2005.101 0.0 90.0 105 0 x x x x x x x x x x x x x x x
VSL-MN LHN LHE S 0014 2005.153 2015.149 0.0 90.0 1135 12 x x x x x x x -1 x x x x x x x
VTS-MN LHN LHE S 0001 1996.357 2015.149 0.0 90.0 1259 150 x x x x x x -4 x x x x x x x x
WDD-MN LHN LHE S 0001 1995.364 1999.315 0.0 90.0 267 25 x x x x x x x x x x 10 x x x x
WDD-MN LHN LHE S 0002 2000.020 2015.149 0.0 90.0 1866 154 x x x x x x x x x 6 x x x x x