Magnitude 6.1 – JAN MAYEN ISLAND REGION

A strong 6.1 Magnitude earthquake occurred in the Jan Mayen Island region northeast of Iceland early this morning (EST).  At my location, the epicenter was located on a Great Circle oriented just 25° east of north.  This first arrival path is nearly parallel to the boom of my seismograph.  This minimizes the response to the longitudinal P phase arrivals but is well aligned to detect the transverse S phase arrivals, including the SS phase.  The SS phase is a single reflection of the S phase, a body phase, off the surface of the earth.

The arrival time information from the USGS arrival time calculator is shown below:

DATE-(UTC)-TIME    LAT    LON     DEPTH MAG   Q   COMMENTS
2011/01/29 06:55:26  70.96N   6.78W   9.5 6.1      US: JAN MAYEN ISLAND REGION
Expected 20s period surface wave amplitude [  2.08E+01 µm]  [  6.54E+00 µm/s]
Expected 1s period body wave amplitude     [  1.73E-01 µm]  [  1.09E+00 µm/s]

delta   azimuth (degrees clockwise from north)
(deg)      eq-to-station     station-to-eq
47.46          272.1              25.5

travel   arrival time
#  code      time(s)  dy hr mn sec
1  P          514.84   0  7  4  0
2  pP         517.84   0  7  4  3
3  sP         519.09   0  7  4  5
4  PcP        604.97   0  7  5 30
5  PP         626.24   0  7  5 52
6  PP         626.67   0  7  5 52
7  ScP        839.18   0  7  9 25
8  PcS        840.39   0  7  9 26
9  S          930.16   0  7 10 56
10  pS         933.81   0  7 10 59
11  sS         935.27   0  7 11  1
12  PKiKP     1017.53   0  7 12 23
13  pPKiKP    1020.80   0  7 12 26
14  sPKiKP    1021.99   0  7 12 27
15  ScS       1108.93   0  7 13 54
16  SS        1139.59   0  7 14 25
17  SS        1145.37   0  7 14 31
18  SnSn      1181.51   0  7 15  7
19  SKiKP     1229.77   0  7 15 55
20  PKKPdf    1889.97   0  7 26 55
21  SKKPdf    2102.27   0  7 30 28
22  PKKSdf    2103.46   0  7 30 29
23  SKKSdf    2315.62   0  7 34  1
24  P'P'df    2393.41   0  7 35 19
25  P'P'ab    2446.63   0  7 36 12
26  S'S'df    3248.16   0  7 49 34
27  LQ        1204.56   0  7 15 30
28  LR        1336.89   0  7 17 42
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