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
BDM-BK LHN LHE S 0006 2006.002 2007.323 0.0 90.0 594 67 x x x x x x x 1 x x x x x x x
CMB-BK LHN-00 LHE-00 S 0001 2010.352 2015.365 0.0 90.0 1535 303 x x x x x x x x 3 x x x x x x
CMB-BK LHN LHE S 0006 2006.002 2010.349 0.0 90.0 1277 217 x x x x x x x x 2 x x x x x x
CVS-BK LHN LHE S 0004 2006.002 2007.323 0.0 90.0 596 67 x x x x x x x 0 x x x x x x x
FARB-BK LHN LHE S 0008 2006.002 2007.323 0.0 90.0 595 7 x x x x x x x -1 x x x x x x x
GASB-BK LHN LHE S 0001 2006.002 2007.323 0.0 90.0 596 59 x x x x x x x 0 x x x x x x x
HOPS-BK LHN LHE S 0006 2006.002 2007.127 0.0 90.0 425 44 x x x x x x -4 x x x x x x x x
HOPS-BK LHN LHE S 0007 2007.132 2007.136 90.0 0.0 4 0 x x x x x x x x x x x x x x x
HOPS-BK LHN LHE S 0008 2007.137 2007.158 0.0 90.0 13 0 x x x x x x x x x x x x x x x
HOPS-BK LHN LHE S 0009 2007.159 2007.169 0.0 90.0 10 0 x x x x x x x x x x x x x x x
HOPS-BK LHN LHE S 0010 2007.175 2007.275 0.0 90.0 107 22 x x x x x x -2 x x x x x x x x
HOPS-BK LHN LHE S 0011 2007.277 2007.323 0.0 90.0 37 7 x x x x x x x -1 x x x x x x x
HUMO-BK LHN-00 LHE-00 S 0001 2010.281 2015.365 0.0 90.0 1489 423 x x x x x x -2 x x x x x x x x
HUMO-BK LHN LHE S 0003 2006.002 2010.277 0.0 90.0 1120 198 x x x x x x -2 x x x x x x x x
JCC-BK LHN LHE S 0003 2006.005 2007.323 0.0 90.0 591 139 x x x x x x x 0 x x x x x x x
JRSC-BK LHN LHE S 0007 2006.002 2007.323 0.0 90.0 596 33 x x x x x -5 x x x x x x x x x
KCC-BK LHN LHE S 0007 2006.002 2006.178 0.0 90.0 137 9 x x x x x x x 0 x x x x x x x
KCC-BK LHN LHE S 0008 2006.179 2007.306 0.0 90.0 443 93 x x x x x x -2 x x x x x x x x
KCC-BK LHN LHE S 0009 2007.308 2007.323 0.0 90.0 16 6 x x x x x x -4 x x x x x x x x
MCCM-BK LHN-00 LHE-00 S 0001 2010.246 2015.253 0.0 90.0 1506 224 x x x x x x x 0 x x x x x x x
MCCM-BK LHN-00 LHE-00 S 0002 2015.255 2015.365 0.0 90.0 87 12 x x x x x x x 0 x x x x x x x
MCCM-BK LHN LHE S 0001 2006.054 2010.239 0.0 90.0 1135 149 x x x x x x x 1 x x x x x x x
MNRC-BK LHN LHE S 0004 2006.002 2007.323 0.0 90.0 593 91 x x x x x x x 1 x x x x x x x
MOD-BK LHN LHE S 0001 2006.002 2006.200 0.0 90.0 132 15 x x x x x -5 x x x x x x x x x
MOD-BK LHN LHE S 0002 2006.204 2007.323 90.0 0.0 405 55 x x x x x x x -1 x x x x x x x
ORV-BK LHN LHE S 0002 2006.002 2007.323 0.0 90.0 596 126 x x x x x x x 1 x x x x x x x
PACP-BK LHN LHE S 0002 2006.002 2007.319 0.0 90.0 588 37 x x x x x x x 1 x x x x x x x
PKD-BK LHN LHE S 0002 2006.002 2007.323 0.0 90.0 596 80 x x x x x x x 0 x x x x x x x
SAO-BK LHN-00 LHE-00 S 0001 2010.142 2012.259 0.0 90.0 742 89 x x x x x x x x x 5 x x x x x
SAO-BK LHN-00 LHE-00 S 0002 2012.264 2012.290 0.0 90.0 15 0 x x x x x x x x x x x x x x x
SAO-BK LHN-00 LHE-00 S 0003 2012.291 2015.365 0.0 90.0 930 114 x x x x x x x x x 6 x x x x x
SAO-BK LHN LHE S 0008 2008.169 2010.140 0.0 90.0 509 88 x x x x x x x x x 5 x x x x x
WDC-BK LHN-00 LHE-00 S 0001 2011.129 2015.365 0.0 90.0 1363 259 x x x x x x x x 2 x x x x x x
WDC-BK LHN LHE S 0002 2006.002 2011.125 0.0 90.0 1460 306 x x x x x x x x 3 x x x x x x
WENL-BK LHN LHE S 0008 2006.002 2007.219 0.0 90.0 497 20 x x x x x x x -1 x x x x x x x
WENL-BK LHN LHE S 0009 2007.220 2007.323 0.0 90.0 99 7 x x x x x x x -1 x x x x x x x
YBH-BK LH3 LH2 S 0002 2006.237 2007.322 90.0 0.0 148 44 x x x x x x x 1 x x x x x x x
YBH-BK LHN LHE S 0004 2006.002 2007.323 0.0 90.0 596 141 x x x x x x x 1 x x x x x x x