Magnitude 4.5 – UTAH

A light 4.5 Magnitude earthquake occurred this morning in southwest Utah.  Ordinarily, an earthquake of this size and distance would not show very well on my seismograph but this one shows a nice return after bandpass filtering using the AmaSeis software.  This earthquake was in the desert area that my brothers and I drove through a couple of years ago between Caliente, NV and Hanksville, UT.

Results from the USGS Arrival Time calculator are shown below:

DATE-(UTC)-TIME    LAT    LON     DEPTH MAG   Q   COMMENTS
2011/01/03 12:06:36  38.25N 112.37W   0.3 4.5      UU: UTAH
Expected 20s period surface wave amplitude [  1.67E+00 µm]  [  5.23E-01 µm/s]
Expected 1s period body wave amplitude     [  1.38E-02 µm]  [  8.66E-02 µm/s]

delta   azimuth (degrees clockwise from north)
(deg)      eq-to-station     station-to-eq
23.61           74.8             274.3

travel   arrival time
#  code      time(s)  dy hr mn sec
1  P          312.73   0 12 11 48
2  P          312.76   0 12 11 48
3  pP         312.82   0 12 11 48
4  pP         312.85   0 12 11 48
5  sP         312.86   0 12 11 48
6  sP         312.89   0 12 11 48
7  PnPn       339.22   0 12 12 15
8  PcP        537.12   0 12 15 33
9  S          569.06   0 12 16  5
10  pS         569.17   0 12 16  5
11  sS         569.22   0 12 16  5
12  S          571.56   0 12 16  7
13  SPg        571.58   0 12 16  7
14  sS         571.70   0 12 16  7
15  Sn         588.90   0 12 16 24
16  sSn        589.02   0 12 16 25
17  SnSn       606.76   0 12 16 42
18  ScP        756.59   0 12 19 12
19  PcS        756.63   0 12 19 12
20  ScS        983.25   0 12 22 59
21  PKiKP     1000.75   0 12 23 16
22  pPKiKP    1000.85   0 12 23 16
23  sPKiKP    1000.89   0 12 23 16
24  SKiKP     1213.20   0 12 26 49
25  PKKPdf    1911.09   0 12 38 27
26  SKKPdf    2123.54   0 12 41 59
27  PKKSdf    2123.58   0 12 41 59
28  SKKSdf    2336.00   0 12 45 31
29  P'P'df    2420.30   0 12 46 56
30  P'P'ab    2552.51   0 12 49  8
31  S'S'df    3270.79   0 13  1  6
32  LQ         599.33   0 12 16 35
33  LR         665.17   0 12 17 41
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