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.

Alphabetical listing

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
LSA-IC LH1-00 LH2-00 S 0001 2013.175 2014.141 0.0 90.0 147 1 -49 x x x x x x x x x x x x x x
HIA-IC LHN-00 LHE-00 S 0002 2010.294 2013.116 357.0 87.0 386 1 -43 x x x x x x x x x x x x x x
MDJ-IC LHN-10 LHE-10 S 0002 2010.294 2011.076 0.0 90.0 76 15 x x x x x -6 x x x x x x x x x
KMI-IC LHN-10 LHE-10 S 0002 2010.294 2013.015 0.0 90.0 310 119 x x x x x -5 x x x x x x x x x
LSA-IC LH1-00 LH2-00 S 0002 2014.144 2015.149 0.0 90.0 142 29 x x x x x -5 x x x x x x x x x
KMI-IC LHN LHE S 0001 1996.120 1996.250 0.0 270.0 52 15 x x x x x -5 x x x x x x x x x
KMI-IC LHN-10 LHE-10 S 0001 1999.232 2010.281 0.0 90.0 1529 454 x x x x x x -4 x x x x x x x x
KMI-IC LHN-00 LHE-00 S 0001 1999.232 2010.281 0.0 90.0 1529 540 x x x x x x -4 x x x x x x x x
BJT-IC LH1-10 LH2-10 S 0001 2013.131 2015.149 0.0 90.0 307 88 x x x x x x -4 x x x x x x x x
LSA-IC LHN-00 LHE-00 S 0003 2010.294 2013.116 0.0 90.0 386 7 x x x x x x -4 x x x x x x x x
KMI-IC LHN-00 LHE-00 S 0002 2010.294 2012.356 0.0 90.0 310 123 x x x x x x -4 x x x x x x x x
HIA-IC LHN LHE S 0001 1995.006 1999.142 357.0 87.0 541 176 x x x x x x -3 x x x x x x x x
HIA-IC LHN-00 LHE-00 S 0001 1999.166 2010.281 357.0 87.0 1578 574 x x x x x x -3 x x x x x x x x
BJT-IC LHN-00 LHE-00 S 0001 1999.042 2010.281 358.0 88.0 1516 580 x x x x x x -3 x x x x x x x x
BJT-IC LH1-00 LH2-00 S 0001 2013.131 2015.149 0.0 90.0 305 84 x x x x x x -3 x x x x x x x x
KMI-IC LH1-00 LH2-00 S 0001 2013.225 2015.115 0.0 90.0 252 65 x x x x x x -3 x x x x x x x x
SSE-IC LHN-00 LHE-00 S 0002 2010.294 2013.116 353.0 82.0 351 147 x x x x x x -3 x x x x x x x x
SSE-IC LHN-10 LHE-10 S 0002 2010.294 2012.356 353.0 83.0 300 38 x x x x x x -3 x x x x x x x x
WMQ-IC LHN-10 LHE-10 S 0003 2009.089 2009.242 0.0 90.0 51 3 x x x x x x -3 x x x x x x x x
BJT-IC LHN-00 LHE-00 S 0002 2010.294 2013.104 358.0 88.0 374 162 x x x x x x -2 x x x x x x x x
HIA-IC LH1-10 LH2-10 S 0001 2013.175 2015.149 0.0 90.0 284 81 x x x x x x -2 x x x x x x x x
KMI-IC LH1-10 LH2-10 S 0001 2013.225 2015.115 0.0 90.0 253 66 x x x x x x -2 x x x x x x x x
HIA-IC LH1-00 LH2-00 S 0001 2013.175 2015.149 357.0 87.0 283 81 x x x x x x -2 x x x x x x x x
MDJ-IC LH1-00 LH2-00 S 0001 2013.175 2015.149 0.0 90.0 288 77 x x x x x x -2 x x x x x x x x
BJT-IC LHN LHE S 0001 1994.145 1999.037 358.0 88.0 560 197 x x x x x x -2 x x x x x x x x
MDJ-IC LH1-10 LH2-10 S 0001 2013.175 2015.149 0.0 90.0 289 78 x x x x x x -2 x x x x x x x x
WMQ-IC LHN-10 LHE-10 S 0002 2008.051 2009.078 0.0 90.0 164 19 x x x x x x x -1 x x x x x x x
WMQ-IC LHN LHE S 0001 1995.266 1999.166 0.0 90.0 452 109 x x x x x x x -1 x x x x x x x
WMQ-IC LH1-10 LH2-10 S 0001 2013.175 2015.115 0.0 90.0 258 62 x x x x x x x -1 x x x x x x x
SSE-IC LHN-10 LHE-10 S 0001 1999.190 2010.281 353.0 83.0 1508 266 x x x x x x x -1 x x x x x x x
SSE-IC LHN-00 LHE-00 S 0001 1999.190 2010.281 353.0 82.0 1508 446 x x x x x x x -1 x x x x x x x
SSE-IC LH1-10 LH2-10 S 0001 2013.175 2015.115 0.0 90.0 269 70 x x x x x x x -1 x x x x x x x
SSE-IC LH1-00 LH2-00 S 0001 2013.175 2015.115 0.0 90.0 269 68 x x x x x x x -1 x x x x x x x
QIZ-IC LHN-00 LHE-00 S 0002 2010.294 2013.005 0.0 90.0 314 108 x x x x x x x -1 x x x x x x x
QIZ-IC LHN-00 LHE-00 S 0001 2001.049 2010.281 0.0 90.0 1337 394 x x x x x x x -1 x x x x x x x
MDJ-IC LHN LHE S 0001 1996.316 1996.345 180.0 270.0 15 3 x x x x x x x -1 x x x x x x x
MDJ-IC LHN-00 LHE-00 S 0001 1999.142 2010.281 0.0 90.0 1574 543 x x x x x x x -1 x x x x x x x
XAN-IC LHN LHE S 0002 1995.149 1999.177 0.0 90.0 474 111 x x x x x x x 0 x x x x x x x
WMQ-IC LHN-00 LHE-00 S 0001 1999.169 2009.242 0.0 90.0 1339 367 x x x x x x x 0 x x x x x x x
WMQ-IC LH1-00 LH2-00 S 0001 2013.175 2015.115 0.0 90.0 259 63 x x x x x x x 0 x x x x x x x
SSE-IC LHN LHE S 0001 1996.264 1999.188 353.0 82.0 295 95 x x x x x x x 0 x x x x x x x
QIZ-IC LH1-00 LH2-00 S 0001 2013.038 2015.149 0.0 90.0 340 98 x x x x x x x 0 x x x x x x x
MDJ-IC LHN-10 LHE-10 S 0003 2011.079 2013.116 0.0 90.0 292 108 x x x x x x x 0 x x x x x x x
MDJ-IC LHN LHE S 0002 1996.357 1999.136 0.0 90.0 251 61 x x x x x x x 0 x x x x x x x
LSA-IC LHN-10 LHE-10 S 0002 2010.294 2013.116 0.0 90.0 386 80 x x x x x x x 0 x x x x x x x
ENH-IC LHN-10 LHE-10 S 0003 2011.065 2013.116 0.0 90.0 334 60 x x x x x x x 0 x x x x x x x
LSA-IC LHN LHE S 0002 1998.101 1999.207 0.0 90.0 124 23 x x x x x x x 0 x x x x x x x
MDJ-IC LHN-00 LHE-00 S 0002 2010.294 2013.116 0.0 90.0 369 138 x x x x x x x 0 x x x x x x x
QIZ-IC LH1-10 LH2-10 S 0001 2013.038 2015.149 0.0 90.0 339 96 x x x x x x x 0 x x x x x x x
ENH-IC LHN LHE S 0001 1997.263 1999.224 0.0 90.0 175 44 x x x x x x x 1 x x x x x x x
XAN-IC LHN-10 LHE-10 S 0002 2008.058 2010.236 0.0 90.0 371 101 x x x x x x x 1 x x x x x x x
WMQ-IC LHN-10 LHE-10 S 0004 2010.294 2012.356 0.0 90.0 314 30 x x x x x x x 1 x x x x x x x
WMQ-IC LHN-00 LHE-00 S 0002 2010.294 2013.116 0.0 90.0 367 121 x x x x x x x 1 x x x x x x x
MDJ-IC LHN-10 LHE-10 S 0001 1999.142 2010.281 0.0 90.0 1575 468 x x x x x x x 1 x x x x x x x
ENH-IC LHN-00 LHE-00 S 0002 2000.112 2010.281 0.0 90.0 1456 555 x x x x x x x 1 x x x x x x x
LSA-IC LHN-00 LHE-00 S 0001 1999.209 2004.162 0.0 90.0 573 80 x x x x x x x 1 x x x x x x x
XAN-IC LHN-10 LHE-10 S 0003 2010.246 2010.272 0.0 90.0 9 5 x x x x x x x x 2 x x x x x x
XAN-IC LHN-10 LHE-10 S 0001 1999.184 2008.056 0.0 90.0 1065 305 x x x x x x x x 2 x x x x x x
XAN-IC LHN-00 LHE-00 S 0001 1999.184 2010.272 0.0 90.0 1442 110 x x x x x x x x 2 x x x x x x
XAN-IC LHN LHE S 0001 1992.336 1994.349 0.0 90.0 221 76 x x x x x x x x 2 x x x x x x
XAN-IC LH1-10 LH2-10 S 0001 2013.225 2015.115 0.0 90.0 246 59 x x x x x x x x 2 x x x x x x
WMQ-IC LHN-10 LHE-10 S 0001 1999.169 2008.047 0.0 90.0 1121 95 x x x x x x x x 2 x x x x x x
LSA-IC LHN-10 LHE-10 S 0001 1999.209 2010.281 0.0 90.0 1485 125 x x x x x x x x 2 x x x x x x
ENH-IC LHN-10 LHE-10 S 0001 1999.226 2010.281 0.0 90.0 1543 144 x x x x x x x x 2 x x x x x x
ENH-IC LHN-00 LHE-00 S 0001 1999.226 2000.098 0.0 90.0 88 26 x x x x x x x x 2 x x x x x x
ENH-IC LH1-10 LH2-10 S 0001 2013.183 2015.149 0.0 90.0 280 77 x x x x x x x x 2 x x x x x x
ENH-IC LH1-00 LH2-00 S 0002 2013.257 2013.329 358.0 90.0 2 1 x x x x x x x x 2 x x x x x x
XAN-IC LHN-10 LHE-10 S 0004 2010.294 2012.356 0.0 90.0 322 129 x x x x x x x x 3 x x x x x x
XAN-IC LH1-00 LH2-00 S 0001 2013.225 2015.115 0.0 90.0 246 62 x x x x x x x x 3 x x x x x x
LSA-IC LH1-10 LH2-10 S 0001 2013.175 2015.149 0.0 90.0 278 59 x x x x x x x x 3 x x x x x x
LSA-IC LHN-00 LHE-00 S 0002 2004.177 2010.281 0.0 90.0 913 221 x x x x x x x x 4 x x x x x x
LSA-IC LHN LHE S 0001 1995.219 1998.093 0.0 90.0 333 49 x x x x x x x x 4 x x x x x x
ENH-IC LHN-00 LHE-00 S 0003 2010.294 2013.116 0.0 90.0 386 104 x x x x x x x x 4 x x x x x x
XAN-IC LHN-00 LHE-00 S 0002 2010.294 2013.015 0.0 90.0 324 35 x x x x x x x x x 6 x x x x x
KMI-IC LHN LHE S 0002 1996.255 1999.229 0.0 90.0 305 0 x x x x x x x x x x x x x x x
HIA-IC LHN LHE S 0002 1999.157 1999.157 87.0 87.0 1 0 x x x x x x x x x x x x x x x
ENH-IC LHN-10 LHE-10 S 0002 2010.294 2011.060 0.0 90.0 51 0 x x x x x x x x x x x x x x x