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
AFI-DW LHN LHE M 0001 1981.145 1986.303 0.0 90.0 109 0 x x x x x x x x x x x x x x x
AFI-DW LHN LHE M 0002 1987.119 1991.317 0.0 90.0 93 9 x x x x x -5 x x x x x x x x x
ALQ-DW LHN LHE M 0001 1981.065 1982.204 0.0 90.0 38 0 x x x x x x x x x x x x x x x
BDF-DW LHN LHE M 0001 1982.162 1993.159 0.0 90.0 205 2 x x x x x x x 0 x x x x x x x
BER-DW LHN LHE M 0001 1981.244 1984.191 0.0 90.0 76 0 x x x x x x x x x x x x x x x
CMB-DW LHN LHE M 0001 1987.112 1989.070 0.0 90.0 66 2 x x x x x x x x x x x x 19 x x
CMB-DW LHN LHE M 0002 1989.096 1992.148 0.0 90.0 111 24 x x x x x x x x 3 x x x x x x
COL-DW LHN LHE M 0001 1982.011 1986.327 0.0 90.0 160 0 x x x x x x x x x x x x x x x
COL-DW LHN LHE M 0002 1987.037 1991.052 0.0 90.0 139 28 x x x x x x x -1 x x x x x x x
GDH-DW LHN LHE M 0001 1982.249 1993.286 0.0 90.0 280 4 x x x x x x x x 2 x x x x x x
HON-DW LHN LHE M 0001 1983.080 1990.224 0.0 90.0 251 0 x x x x x x x x x x x x x x x
JAS-DW LHN LHE M 0001 1980.278 1984.176 0.0 90.0 81 0 x x x x x x x x x x x x x x x
JAS1-DW LHN LHE M 0001 1984.219 1986.318 0.0 90.0 62 0 x x x x x x x x x x x x x x x
KBS-DW LHN LHE M 0001 1986.293 1987.225 0.0 90.0 15 0 x x x x x x x x x x x x x x x
KEV-DW LHN LHE M 0001 1981.289 1987.061 0.0 90.0 149 3 x x x x x x x x x x x 11 x x x
KEV-DW LHN LHE M 0002 1987.077 1993.144 0.0 90.0 196 65 x x x x x x x x x x 8 x x x x
LEM-DW LHN LHE M 0001 1982.158 1988.308 0.0 90.0 102 0 x x x x x x x x x x x x x x x
LON-DW LHN LHE M 0001 1980.284 1993.249 0.0 90.0 470 6 x x x x x x x x 2 x x x x x x
SCP-DW LHN LHE M 0001 1981.048 1990.319 0.0 90.0 302 0 x x x x x x x x x x x x x x x
SCP-DW LHN LHE M 0002 1990.364 1991.049 0.0 90.0 5 0 x x x x x x x x x x x x x x x
SCP-DW LHN LHE M 0003 1991.052 1992.246 0.0 90.0 62 1 x x x x x x x x x 5 x x x x x
SLR-DW LHN LHE M 0001 1981.298 1982.337 0.0 90.0 22 0 x x x x x x x x x x x x x x x
SLR-DW LHN LHE M 0002 1983.135 1983.152 0.0 270.0 3 0 x x x x x x x x x x x x x x x
SLR-DW LHN LHE M 0003 1983.172 1993.019 0.0 90.0 264 6 x x x x x x -2 x x x x x x x x
TAU-DW LHN LHE M 0001 1981.246 1993.298 0.0 90.0 330 8 x x x x x x x x x 5 x x x x x
TOL-DW LHN LHE M 0001 1981.328 1987.127 0.0 90.0 139 0 x x x x x x x x x x x x x x x
TOL-DW LHN LHE M 0002 1987.279 1991.174 0.0 90.0 110 14 x x x x x -5 x x x x x x x x x