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 M 0006 2006.002 2007.320 0.0 90.0 87 12 x x x x x x -2 x x x x x x x x
CMB-BK LHN-00 LHE-00 M 0001 2010.354 2015.351 0.0 90.0 265 51 x x x x x x x x 2 x x x x x x
CMB-BK LHN LHE M 0006 2006.002 2010.336 0.0 90.0 194 36 x x x x x x x 0 x x x x x x x
CVS-BK LHN LHE M 0004 2006.002 2007.320 0.0 90.0 87 13 x x x x x x -2 x x x x x x x x
FARB-BK LHN LHE M 0008 2006.002 2007.320 0.0 90.0 87 2 x x x x -9 x x x x x x x x x x
GASB-BK LHN LHE M 0001 2006.002 2007.320 0.0 90.0 87 14 x x x x x x -2 x x x x x x x x
HOPS-BK LHN LHE M 0006 2006.002 2007.126 0.0 90.0 53 2 x x x x -10 x x x x x x x x x x
HOPS-BK LHN LHE M 0009 2007.164 2007.164 0.0 90.0 1 0 x x x x x x x x x x x x x x x
HOPS-BK LHN LHE M 0010 2007.175 2007.273 0.0 90.0 24 4 x x x x x -5 x x x x x x x x x
HOPS-BK LHN LHE M 0011 2007.278 2007.320 0.0 90.0 9 1 x x x x x x -4 x x x x x x x x
HUMO-BK LHN-00 LHE-00 M 0001 2010.294 2015.351 0.0 90.0 256 100 x x x x x x -4 x x x x x x x x
HUMO-BK LHN LHE M 0003 2006.002 2010.272 0.0 90.0 176 41 x x x x x -5 x x x x x x x x x
JCC-BK LHN LHE M 0003 2006.008 2007.320 0.0 90.0 84 24 x x x x x x x -1 x x x x x x x
JRSC-BK LHN LHE M 0007 2006.002 2007.320 0.0 90.0 87 7 x x x x -8 x x x x x x x x x x
KCC-BK LHN LHE M 0007 2006.002 2006.165 0.0 90.0 20 2 x x x x x x x x x x 10 x x x x
KCC-BK LHN LHE M 0008 2006.189 2007.304 0.0 90.0 63 14 x x x x x -5 x x x x x x x x x
KCC-BK LHN LHE M 0009 2007.314 2007.320 0.0 90.0 4 1 x x x x x -7 x x x x x x x x x
MCCM-BK LHN-00 LHE-00 M 0001 2010.246 2015.224 0.0 90.0 250 27 x x x x x x x 0 x x x x x x x
MCCM-BK LHN-00 LHE-00 M 0002 2015.256 2015.351 0.0 90.0 23 5 x x x x x x x -1 x x x x x x x
MCCM-BK LHN LHE M 0001 2006.073 2010.225 0.0 90.0 176 24 x x x x x x -3 x x x x x x x x
MNRC-BK LHN LHE M 0004 2006.002 2007.320 0.0 90.0 87 17 x x x x x x x -1 x x x x x x x
MOD-BK LHN LHE M 0001 2006.002 2006.165 0.0 90.0 20 2 x x x x x x x 1 x x x x x x x
MOD-BK LHN LHE M 0002 2006.271 2007.320 90.0 0.0 60 8 x x x x x x -4 x x x x x x x x
ORV-BK LHN LHE M 0002 2006.002 2007.320 0.0 90.0 87 22 x x x x x x -2 x x x x x x x x
PACP-BK LHN LHE M 0002 2006.002 2007.319 0.0 90.0 86 6 x x x x x -5 x x x x x x x x x
PKD-BK LHN LHE M 0002 2006.002 2007.320 0.0 90.0 87 13 x x x x x x -2 x x x x x x x x
SAO-BK LHN-00 LHE-00 M 0001 2010.147 2012.249 0.0 90.0 117 7 x x x x x x x x x 6 x x x x x
SAO-BK LHN-00 LHE-00 M 0002 2012.270 2012.286 0.0 90.0 4 0 x x x x x x x x x x x x x x x
SAO-BK LHN-00 LHE-00 M 0003 2012.302 2015.351 0.0 90.0 169 16 x x x x x x x x 3 x x x x x x
SAO-BK LHN LHE M 0008 2008.252 2010.129 0.0 90.0 77 10 x x x x x x x x 2 x x x x x x
WDC-BK LHN-00 LHE-00 M 0001 2011.130 2015.351 0.0 90.0 236 57 x x x x x x x 1 x x x x x x x
WDC-BK LHN LHE M 0002 2006.002 2011.113 0.0 90.0 225 54 x x x x x x x 0 x x x x x x x
WENL-BK LHN LHE M 0008 2006.002 2007.214 0.0 90.0 61 1 x x x x x -5 x x x x x x x x x
WENL-BK LHN LHE M 0009 2007.220 2007.320 0.0 90.0 26 4 x x x x -10 x x x x x x x x x x
YBH-BK LH3 LH2 M 0002 2006.236 2007.304 90.0 0.0 24 8 x x x x x x x -1 x x x x x x x
YBH-BK LHN LHE M 0004 2006.002 2007.320 0.0 90.0 87 22 x x x x x x x -1 x x x x x x x