Phase Data
1 MAY 2011 (121)
ot = 23:18:59.59 +/- 0.94 SAMOA ISLANDS REGION
lat = -15.138 +/- 11.7
lon = -172.980 +/- 11.0 MAGNITUDE 5.0 (GS)
dep = 16.8 +/- 4.8
122 km (76 miles) NE of Hihifo, Tonga (pop 2,000)
197 km (122 miles) SW of APIA, Samoa
703 km (437 miles) NNE of NUKU`ALOFA, Tonga
2695 km (1673 miles) NNE of Auckland, New Zealand
nph = 181 of 188 se = 0.46 FE=169 A
error ellipse = (146.0, 4.0, 18.7; 56.0, 0.0, 15.8;326.0, 85.0, 7.2)
mb = 5.0 (156) ML = 4.9 ( 2) mblg = 5.0 ( 2) md = 2.6 ( 1) MS = 0.0 ( 0)
sta phase arrival res dist azm amp per mag amp per mag sta
AFI ee 23:19:20.11 0.0X 1.7 44 d:2.6+1 2.6 L:3.9+1 .80 5.1 AFI
ePn 23:19:35.76 7.3X g:9.2+0 .70 5.0
MSVF ePn 23:21:08.71 -0.1 9.0 252 MSVF
RAR ePn 23:22:16.89 0.6 13.9 118 RAR
RAO ePn 23:22:28.80 1.1 14.8 197 RAO
TARA eP 23:23:47.11 -0.9 21.5 318 b:8.7+1 .90 5.2 TARA
KNTN eSn 23:23:57.84 -14.3X 12.4 6 KNTN
XMAS eP 23:24:02.33 -1.2 23.0 43 b:1.7+2 1.2 5.4 XMAS
URZ eP 23:24:19.22 -0.1 24.6 199 b:9.3+1 1.2 5.3 URZ
HIZ eP 23:24:26.74 -1.7 25.6 202 b:1.9+2 1.3 5.6 HIZ
BKZ eP 23:24:27.75 -0.9 25.7 199 b:2.2+1 .90 4.8 BKZ
BFZ eP 23:24:41.39 -0.4 27.1 198 b:2.1+2 1.7 5.5 BFZ
LTZ eP 23:25:10.74 0.4 30.3 202 b:3.1+1 .98 5.1 LTZ
KWAJ eP 23:25:12.88 0.0 30.6 320 b:4.8+2 1.5 6.1 KWAJ
OXZ eP 23:25:13.93 -1.3 30.9 202 b:7.3+1 1.5 5.3 OXZ
WKZ eP 23:25:36.41 0.0 33.3 204 b:2.7+2 1.9 5.8 WKZ
MLZ eP 23:25:42.99 -0.3 34.1 204 b:2.9+1 1.0 5.2 MLZ
DCZ eP 23:25:47.45 0.1 34.6 205 b:7.4+1 1.5 5.3 DCZ
WHZ eP 23:25:47.77 0.1 34.6 204 b:3.9+1 .94 5.3 WHZ
KEKH eP 23:26:26.39 0.1 39.1 20 b:1.5+2 1.1 5.6 KEKH
HON eP 23:26:27.06 0.8 39.1 23 b:1.5+2 .88 5.7 HON
CAN eP 23:26:28.43 -1.2 39.5 232 b:3.1+1 1.4 4.8 CAN
OPA eP 23:26:29.03 0.1 39.4 22 b:1.3+2 1.3 5.4 OPA
MANU eP 23:26:41.55 -2.4 41.2 285 b:4.5+1 1.1 5.1 MANU
PTCN eP 23:26:44.54 -0.2 41.3 111 b:6.0+2 1.3 6.2 PTCN
MIDW eP 23:27:01.22 0.5 43.3 354 b:4.8+1 .70 5.4 MIDW
STKA eP 23:27:11.02 0.5 44.5 240 b:1.6+0 .90 3.9 STKA
MHA eP 23:27:27.30 0.6 46.6 318 MHA
WRAB eP 23:27:55.61 0.0 50.3 257 b:8.2+0 1.2 4.6 WRAB
AS01 eP 23:27:57.14 -0.4 50.5 252 AS01
AS31 eP 23:27:58.47 0.6 50.6 252 b:3.6+0 .80 4.4 AS31
SOEI eP 23:29:15.13 -0.1 61.3 267 SOEI
esP 23:29:20.55 0.0X
PASC eP 23:30:19.07 -0.9 71.6 46 b:2.3+1 1.1 5.2 PASC
KMRM eP 23:30:20.33 0.1 71.6 38 b:3.4+1 .94 5.4 KMRM
MWC eP 23:30:20.92 0.0 71.7 46 b:2.7+1 1.0 5.3 MWC
CMB eP 23:30:23.86 -0.6 72.3 41 b:9.2+0 .95 4.8 CMB
ISA eP 23:30:24.32 0.5 72.2 44 b:1.9+1 1.1 5.1 ISA
AFDM eP 23:30:25.32 -0.2 72.5 40 b:9.7+0 1.0 4.8 AFDM
PFO eP 23:30:25.67 0.1 72.5 47 b:1.4+1 1.2 4.9 PFO
PEA0 eP 23:30:25.72 0.4 72.5 342 PEA0
WDC eP 23:30:25.77 0.1 72.5 38 b:1.2+1 1.3 4.8 WDC
GSC eP 23:30:29.07 -0.4 73.1 45 b:2.1+1 1.1 5.1 GSC
DAC eP 23:30:29.43 -0.1 73.1 44 b:1.0+1 1.2 4.8 DAC
WAKR eP 23:30:29.92 0.0 73.2 41 WAKR
YBH eP 23:30:29.94 0.5 73.2 37 b:1.3+1 1.0 4.9 YBH
GLA eP 23:30:31.24 0.6 73.3 48 b:2.4+1 1.2 5.1 GLA
YER eP 23:30:31.98 -0.3 73.6 41 YER
HUMO eP 23:30:32.38 0.6 73.6 36 b:1.1+1 1.1 4.8 HUMO
NV01 eP 23:30:33.15 -0.8 73.9 42 NV01
113A eP 23:30:33.87 -0.3 73.9 49 b:1.4+1 1.0 4.9 113A
Y12C eP 23:30:34.19 0.3 73.9 48 b:1.6+1 1.0 5.0 Y12C
NV11 eP 23:30:34.27 -0.2 74.0 42 b:1.5+1 1.0 5.0 NV11
TPNV eP 23:30:36.82 -0.2 74.4 44 b:1.1+1 1.0 4.8 TPNV
MOD eP 23:30:38.51 0.1 74.7 38 b:1.2+1 .90 4.9 MOD
K05A eP 23:30:39.77 0.4 74.8 37 b:2.8+1 1.1 5.2 K05A
Y14A eP 23:30:40.77 -0.1 75.1 48 Y14A
W13A eP 23:30:40.80 -0.1 75.0 47 b:1.3+1 1.0 4.9 W13A
H04A eP 23:30:42.25 0.3 75.3 35 b:1.4+1 .95 5.0 H04A
R11A eP 23:30:43.64 -0.3 75.6 43 b:8.1+0 1.1 4.7 R11A
E03A eP 23:30:44.92 0.5 75.8 33 b:3.0+1 1.0 5.3 E03A
F04A eP 23:30:45.67 0.0 76.0 34 b:1.4+1 1.0 5.0 F04A
TUC eP 23:30:45.82 0.1 75.9 51 b:1.8+1 1.0 5.1 TUC
WVOR eP 23:30:45.92 0.0 76.0 38 b:9.4+0 .95 4.8 WVOR
NLWA eP 23:30:47.42 0.6 76.2 32 b:1.3+1 1.1 4.9 NLWA
G06A eP 23:30:48.75 -0.1 76.5 35 b:1.5+1 1.2 4.9 G06A
LCMT eP 23:30:49.04 0.2 76.5 45 b:1.1+1 1.0 4.8 LCMT
X16A eP 23:30:49.17 0.3 76.4 48 b:2.3+1 1.0 5.2 X16A
319A eP 23:30:49.92 0.1 76.6 52 319A
KS01 eP 23:30:50.14 2.5 76.3 315 KS01
LON eP 23:30:50.80 0.2 76.8 33 b:6.9+0 1.1 4.6 LON
PSUT eP 23:30:50.92 -0.1 76.8 44 b:9.9+0 .98 4.8 PSUT
KNB eP 23:30:50.93 0.3 76.8 46 b:1.1+1 1.0 4.9 KNB
U15A eP 23:30:51.42 0.3 76.8 46 U15A
D05A eP 23:30:51.72 0.2 77.0 33 b:5.8+1 1.3 5.5 D05A
RSO eP 23:30:52.02 0.2 77.1 10 RSO
WUAZ eP 23:30:52.25 0.1 77.0 48 b:2.1+1 1.1 5.1 WUAZ
ELK eP 23:30:52.54 -0.1 77.1 41 b:7.4+0 1.1 4.6 ELK
SPU eP 23:30:55.36 -0.8 77.9 10 SPU
X18A eP 23:30:55.50 0.3 77.6 49 b:2.0+1 1.2 5.1 X18A
LTY eP 23:30:56.03 0.2 77.8 34 b:7.8+0 1.0 4.7 LTY
HAWA eP 23:30:56.80 0.6 77.8 35 b:2.2+1 1.3 5.0 HAWA
MTPU eP 23:30:57.01 0.8 77.7 45 b:2.8+1 1.3 5.1 MTPU
MSU eP 23:30:57.92 0.6 78.0 45 MSU
RC01 eP 23:30:58.01 0.1 78.2 11 b:1.6+1 1.1 5.0 RC01
MFID eP 23:30:58.26 -0.3 78.2 39 b:8.2+0 1.0 4.7 MFID
DUG eP 23:30:59.36 -0.2 78.4 43 b:1.1+1 1.1 4.8 DUG
D08A eP 23:31:00.27 0.0 78.6 34 b:2.7+1 1.3 5.1 D08A
PMR eP 23:31:00.68 -0.4 78.8 11 b:2.1+1 1.2 5.0 PMR
ZAIG eP 23:31:01.05 0.2 78.5 63 b:7.7+0 1.0 4.7 ZAIG
TT01 eP 23:31:01.24 -0.5 78.9 8 TT01
BGU eP 23:31:01.30 0.4 78.6 42 b:6.6+0 1.4 4.5 BGU
TTA eP 23:31:02.08 0.1 78.9 8 b:1.3+1 1.0 4.9 TTA
NLU eP 23:31:02.13 0.4 78.8 43 b:5.8+0 1.1 4.5 NLU
GAMB eP 23:31:02.30 2.0 78.7 1 b:2.0+1 1.3 5.0 GAMB
DIV eP 23:31:02.58 0.0 79.1 13 b:2.2+1 .92 5.2 DIV
B08A eP 23:31:02.62 -0.8 79.1 33 b:1.4+1 1.2 4.9 B08A
BMRM eP 23:31:03.41 0.1 79.2 14 b:3.0+1 1.0 5.3 BMRM
TMUT eP 23:31:03.80 0.6 79.0 44 b:2.8+1 1.0 5.3 TMUT
HLID eP 23:31:04.06 0.2 79.2 39 b:9.1+0 1.0 4.8 HLID
HVU eP 23:31:04.17 -0.1 79.2 41 b:1.1+1 1.2 4.8 HVU
KLU eP 23:31:04.30 0.0 79.3 13 b:1.4+1 1.0 4.9 KLU
C09A eP 23:31:04.55 -0.1 79.4 34 b:2.4+1 .30 5.7 C09A
CTU eP 23:31:05.21 0.3 79.4 43 b:1.2+1 1.3 4.8 CTU
SRU eP 23:31:05.32 0.2 79.4 45 b:1.6+1 .98 5.0 SRU
JLU eP 23:31:05.49 -0.3 79.5 43 b:1.0+1 .98 4.8 JLU
P17A eP 23:31:05.55 0.3 79.4 44 b:2.2+1 1.0 5.1 P17A
CAST eP 23:31:06.06 -1.5 80.0 9 b:4.1+0 1.0 4.4 CAST
BALM eP 23:31:06.64 0.1 79.8 15 b:1.3+1 1.0 4.9 BALM
MNTX eP 23:31:06.75 -0.3 79.8 53 b:9.9+0 1.1 4.7 MNTX
HWUT eP 23:31:07.70 -0.3 79.9 42 b:7.7+0 1.2 4.6 HWUT
MVCO eP 23:31:07.79 -0.1 79.9 47 b:4.5+0 .85 4.5 MVCO
BNM eP 23:31:08.08 0.2 79.9 51 BNM
P18A eP 23:31:08.23 0.6 79.8 44 b:1.1+1 1.1 4.8 P18A
LPM eP 23:31:08.24 0.1 79.9 50 LPM
PV05 eP 23:31:08.47 0.7 79.9 46 PV05
KTH eP 23:31:08.50 -0.8 80.3 10 b:8.2+0 .96 4.7 KTH
TX31 eP 23:31:08.62 -0.5 80.1 56 TX31
eP 23:31:09.20 -0.1
PV10 eP 23:31:08.88 0.1 80.0 46 PV10
PV09 eP 23:31:08.95 0.1 80.0 46 PV09
TRF eP 23:31:09.08 -0.4 80.3 10 b:1.6+1 1.0 5.0 TRF
NEW eP 23:31:09.35 -0.2 80.3 34 b:8.1+0 1.2 4.6 NEW
PV01 eP 23:31:09.80 -0.1 80.3 46 PV01
SKAG eP 23:31:10.00 0.3 80.4 19 b:1.6+1 1.0 5.0 SKAG
RND eP 23:31:10.34 -0.2 80.5 11 b:1.8+1 1.0 5.0 RND
ANMO eP 23:31:10.36 0.0 80.3 50 b:8.8+0 .95 4.7 ANMO
PAX eP 23:31:11.48 -0.4 80.8 12 b:1.1+1 1.3 4.7 PAX
MCK eP 23:31:11.66 -0.3 80.8 11 b:2.5+1 .96 5.2 MCK
AHID eP 23:31:12.55 -0.2 80.8 41 b:9.3+0 1.2 4.7 AHID
MCMT eP 23:31:12.80 0.1 80.8 39 MCMT
BWN eP 23:31:13.61 -0.1 81.1 10 b:2.4+1 .96 5.2 BWN
MENT eP 23:31:13.72 0.0 81.1 13 b:1.0+1 1.0 4.8 MENT
MSO eP 23:31:14.15 -0.7 81.2 37 b:1.3+1 1.2 4.8 MSO
BSMT eP 23:31:14.84 -0.5 81.3 35 BSMT
FXWY eP 23:31:15.09 -0.3 81.3 41 b:9.1+0 1.2 4.7 FXWY
REDW eP 23:31:15.21 -0.1 81.3 41 b:1.1+1 1.2 4.8 REDW
SNOW eP 23:31:15.42 -0.5 81.4 41 b:9.3+0 1.0 4.8 SNOW
DLMT eP 23:31:15.61 0.7 81.2 38 b:1.3+1 1.3 4.8 DLMT
S22A eP 23:31:15.97 0.4 81.3 47 b:1.8+1 1.0 5.1 S22A
WRH eP 23:31:16.02 -0.3 81.6 11 b:3.3+1 1.0 5.3 WRH
SWMT eP 23:31:16.17 -0.4 81.6 36 SWMT
MLY eP 23:31:16.38 -0.4 81.7 9 b:1.2+1 .96 4.9 MLY
O20A eP 23:31:16.51 0.5 81.4 45 b:6.8+0 .90 4.7 O20A
LRM eP 23:31:16.58 -0.2 81.6 38 LRM
CHMT eP 23:31:16.60 -0.7 81.7 37 CHMT
DOT eP 23:31:16.73 0.1 81.7 13 b:4.0+1 1.0 5.4 DOT
BW06 eP 23:31:16.79 -1.3 81.8 42 BW06
eP 23:31:17.58 -0.5
CCB eP 23:31:17.25 -0.2 81.8 11 b:1.8+1 .92 5.1 CCB
COLA eP 23:31:17.74 -0.7 82.0 11 b:4.0+1 1.1 5.4 COLA
PD31 eP 23:31:17.85 -0.2 81.8 42 PD31
QLMT eP 23:31:17.98 0.7 81.7 39 QLMT
FLWY eP 23:31:18.00 0.3 81.7 40 b:1.9+1 1.3 5.0 FLWY
epwP 23:31:26.28 -1.6X
IL1 eP 23:31:18.09 -0.8 82.1 11 IL1
MDM eP 23:31:18.34 -0.2 82.0 10 b:2.1+1 1.1 5.1 MDM
BOZ eP 23:31:18.51 -0.2 82.0 39 b:1.3+1 1.3 4.8 BOZ
ILB eP 23:31:18.62 -0.3 82.1 11 ILB
SMCO eP 23:31:18.69 0.1 81.8 46 b:1.1+1 1.0 4.9 SMCO
YMR eP 23:31:19.04 0.7 81.9 40 b:1.2+1 1.1 4.8 YMR
SDCO eP 23:31:20.32 -0.3 82.2 48 b:6.0+0 1.2 4.6 SDCO
WALA eP 23:31:20.97 -0.3 82.5 35 b:1.4+1 1.2 4.9 WALA
LKWY eP 23:31:21.36 1.4 82.2 40 b:1.2+1 1.1 4.8 LKWY
MSTX eP 23:31:22.36 -0.4 82.7 52 b:1.7+1 .95 5.2 MSTX
T25A eP 23:31:23.05 -0.2 82.8 49 b:1.1+1 1.0 4.9 T25A
DAWY eP 23:31:24.50 0.5 83.1 14 b:1.4+1 1.0 5.1 DAWY
Q24A eP 23:31:24.82 0.2 83.0 47 b:2.6+1 1.0 5.3 Q24A
ISCO eP 23:31:24.94 0.1 83.1 46 b:6.4+0 1.0 4.7 ISCO
RLMT eP 23:31:25.04 0.1 83.1 40 b:1.4+1 1.2 5.0 RLMT
EGAK eP 23:31:25.31 0.4 83.3 13 b:1.0+1 1.1 4.9 EGAK
GCMT eP 23:31:26.26 1.0 83.2 39 GCMT
N23A eP 23:31:26.35 0.3 83.3 45 b:1.2+1 .95 5.1 N23A
PHWY eP 23:31:28.25 -0.5 83.8 45 b:1.2+1 1.2 5.0 PHWY
AMTX eP 23:31:28.39 -0.4 83.9 52 b:1.5+1 .95 5.2 AMTX
COLD eP 23:31:28.94 1.2 83.8 9 b:1.6+1 1.2 5.1 COLD
EGMT eP 23:31:30.47 -0.1 84.3 37 b:1.6+1 1.1 5.2 EGMT
ABTX eP 23:31:31.94 -0.5 84.6 54 b:2.3+1 1.0 5.3 ABTX
KSCO eP 23:31:33.97 0.4 84.8 48 b:2.5+1 1.0 5.4 KSCO
RSSD eP 23:31:38.56 -0.9 86.0 42 b:2.4+1 1.5 5.2 RSSD
INK eP 23:31:47.90 0.0 87.9 14 b:1.2+1 1.1 5.1 INK
MAW eP 23:31:51.03 1.7 88.2 199 b:3.0+0 .90 4.6 MAW
YKB5 eP 23:31:53.79 -2.7 89.7 23 YKB5
YKW3 eP 23:31:55.94 -0.7 89.7 23 b:7.1+0 1.0 4.9 YKW3
PSI eP 23:31:56.61 2.8X 88.9 273 b:2.7+1 1.2 5.4 PSI
JTS eP 23:32:04.17 1.6 90.8 80 b:3.2+1 .95 5.6 JTS
CHTO eP 23:32:17.51 4.6X 93.0 289 b:3.8+0 .95 4.8 CHTO
FCC eP 23:32:30.47 -0.4 97.2 31 FCC
Generated 2011 MAY 1 at 23:39 UTC
Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver
