Magnitude 6.6 – QUEEN CHARLOTTE ISLANDS REGION

A strong Magnitude 6.6 earthquake struck the Queen Charolette Islands region off the west coast of Canada at 15:30:46 UTC on November 17, 2009.  Because it was shallow, the surface waves were quite strong and were clipped on my seismograph here in northeatern Ohio.  The two types of surface waves, the Love and Rayleigh waves, are also very well delineated in their arrivals, which is often not the case.

The arrival time information from the USGS is included below:

  DATE-(UTC)-TIME    LAT    LON     DEPTH MAG   Q   COMMENTS
  2009/11/17 15:30:46  52.15N 131.38W  11.6 6.6      US: QUEEN CHARLOTTE ISLANDS
   Expected 20s period surface wave amplitude [  1.07E+02 µm]  [  3.36E+01 µm/s]
   Expected 1s period body wave amplitude     [  8.99E-01 µm]  [  5.65E+00 µm/s]

delta   azimuth (degrees clockwise from north)
(deg)      eq-to-station     station-to-eq
35.41           89.1             306.0

                 travel   arrival time
    #  code      time(s)  dy hr mn sec
    1  P          415.68   0 15 37 41
    2  pP         419.26   0 15 37 45
    3  sP         420.80   0 15 37 46
    4  PnPn       494.28   0 15 39  0
    5  PP         496.11   0 15 39  2
    6  PnPn       498.58   0 15 39  4
    7  PnPn       498.59   0 15 39  4
    8  PP         514.92   0 15 39 20
    9  PcP        565.21   0 15 40 11
   10  S          751.10   0 15 43 17
   11  pS         755.35   0 15 43 21
   12  sS         757.22   0 15 43 23
   13  ScP        790.89   0 15 43 56
   14  PcS        792.36   0 15 43 58
   15  SnSn       891.40   0 15 45 37
   16  SS         906.01   0 15 45 52
   17  SS         939.25   0 15 46 25
   18  PKiKP     1006.43   0 15 47 32
   19  pPKiKP    1010.42   0 15 47 36
   20  sPKiKP    1011.88   0 15 47 37
   21  ScS       1035.38   0 15 48  1
   22  SKiKP     1217.87   0 15 51  3
   23  PKKPdf    1901.07   0 16  2 27
   24  SKKPdf    2112.52   0 16  5 58
   25  PKKSdf    2113.98   0 16  5 59
   26  SKKSdf    2325.36   0 16  9 31
   27  P'P'df    2407.79   0 16 10 53
   28  P'P'ab    2498.68   0 16 12 24
   29  S'S'df    3259.19   0 16 25  5
   30  LQ         898.62   0 15 45 44
   31  LR         997.34   0 15 47 23
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