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Table 1 Parameters of OBS stations used in this study

From: Double seismic zone and seismicity in the mantle wedge beneath the Ogasawara Islands identified by an ocean bottom seismometer observation

Station Latitude (N) Longitude (E) Depth (m) Observation period ΔTps-p (s) Pcor (s) Scor (s) σp (s) σs (s)
(°) (min) (°) (min)
A 27 51.0 140 49.7 3270 15 Jul. to 3 Oct. 2015 0.99 0.070 − 0.319 0.281 0.462
B 27 14.3 140 48.0 1219 21 Jun. to 28 Sep. 2015 0.95 1.274 0.296 0.092 0.000
C 27 15.1 140 49.4 944 21 Jun. to 2 Oct. 2015 0.86 1.493 2.594 0.141 0.246
D 27 17.8 140 52.6 1139 21 Jun. to 13 Sep. 2015 0.84 1.387 2.167 0.078 0.301
E 27 16.0 140 55.9 1206 21 Jun. to 28 Sep. 2015 1.04 1.248 1.802 0.188 0.532
F 27 12.2 140 52.2 922 21 Jun. to 18 Sep. 2015 1.11 1.517 1.192 0.288 1.527
G 26 45.0 140 49.8 2127 15 Jul. to 9 Oct. 2015 0.93 0.448 0.233 0.209 0.462
H 27 42.1 141 36.0 4144 15 Jul. to 23 Sep. 2015 1.28 − 0.473 − 1.900 0209 0.430
I 27 15.1 141 36.1 4043 15 Jul. to 5 Oct. 2015 0.60 − 0.451 − 1.650 0.209 0.534
J 26 48.1 141 36.0 3751 15 Jul. to 10 Oct. 2015 1.13 − 0.890 − 2.064 0.204 0.391
K 27 24.0 142 39.0 2783 15 Jul. to 4 Oct. 2015 0.72 0.160 0.418 0.228 0.589
L 26 51.0 142 38.9 2756 15 Jul. to 9 Oct. 2015 0.85 − 0.165 − 0.703 0.352 0.737
X (Chichijima) 27 5.7 142 11.1 − 145 1.574 3.397 0.349 0.690
Y (Hahajima) 26 38.0 142 10.5 − 108 1.194 2.521 0.515 0.631
  1. ΔTps-p, arrival-time difference between the PS and P phases; Pcor, final station correction for the P phase; Scor, final station correction for the S phase; σp, standard deviation of the P-phase arrival time; σs, standard deviation of the S-phase arrival time