Earthquake 20170918-4

2017-09-18 05:28:05.210 15.0 km 5.5 mb
18.0007°S, 13.0018°W
South Atlantic Ocean
807 km W of Jamestown, Saint Helena
Time Error: 1.36 s Depth Error: 99.9 km
Num. Stations: 14 Time RMS: 0.67 s
Num. Phases: 14 Azimuth Gap: 356°
Analysis Type: Manual Max. Intensity (MMI):
Effects Type: Seismic
 

MANUALLY REVIEWED LOCATION

Magnitudes

Preferred Magnitude Stations Error Author Action
Emblem-favorite 5.5 mb 14 0.20 NCMS System-search
5.8 Mwp 6 0.10 NCMS System-search
5.6 M 37 0.20 NCMS System-search
5.8 mB_BB 11 0.20 NCMS System-search
5.1 Ms_BB 7 0.20 NCMS System-search
5.5 mb 0 0 NCMS System-search
5.5 M 0 0 NCMS System-search

Origin Details

Ellipse Major:355.70 km Min. Distance:75.65° Fixed Depth:no
Ellipse Minor:98.80 km Max. Distance:80.76° Fixed Phase:no
Ellipse Strike:146.0° Fixed Location:no Fixed Time:no
Author:NCMS Location Method:Inversion Event Type:Unknown
External Event ID:HYDRA_RED@18467 External Origin ID:HYDRA_RED@36953

Error Ellipse

Azimuth Dip Magnitude Action
Max 327° 837.3 km System-search
Intermediate 58° 24° 242.9 km System-search
Min 236° 65° 165.5 km System-search

None

Channel Time Amplitude Period/Duration Magnitude Event Distance Event Azimuth Action
BH.SAK.--.HHZ 2017-09-18 05:39:57.289 29.2 1.08 s 5.3 mb 75.65° 56.4° System-search
AE.MZR.--.HHZ 2017-09-18 05:39:57.750 865.5 1.88 s 6.0 mB_BB 76.67° 60.3° System-search
AE.MZR.--.HHZ 2017-09-18 05:40:03.339 219.4 1.60 s 6.0 mb 76.67° 60.3° System-search
DN.FAQ.--.HHZ 2017-09-18 05:40:11.269 2e+03 1.48 s 6.2 mB_BB 79.17° 59.6° System-search
DN.NAZ.--.HHZ 2017-09-18 05:40:12.240 391.0 1.18 s 5.6 mB_BB 79.33° 59.4° System-search
DN.NAZ.--.HHZ 2017-09-18 05:40:12.690 30.1 0.86 s 5.3 mb 79.33° 59.4° System-search
OM.ASH.--.HHZ 2017-09-18 05:40:13.210 265.0 2.90 s 5.4 mB_BB 79.52° 59.9° System-search
AE.AJN.--.HHZ 2017-09-18 05:40:13.700 37.7 0.74 s 5.5 mb 78.60° 59.5° System-search
OM.MDH.--.HHZ 2017-09-18 05:40:14.950 149.6 2.36 s 5.1 mB_BB 79.98° 59.4° System-search
DN.HAT.--.HHZ 2017-09-18 05:40:15.279 221.8 3.40 s 5.0 Mwp 79.64° 59.8° System-search
DN.ASU.--.HHZ 2017-09-18 05:40:15.339 2e+03 1.18 s 6.3 mB_BB 78.90° 59.6° System-search
DN.ASU.--.HHZ 2017-09-18 05:40:15.470 306.0 1.16 s 6.2 mb 78.90° 59.6° System-search
AE.ALN.--.HHZ 2017-09-18 05:40:15.720 617.5 1.06 s 5.8 mB_BB 79.01° 60.3° System-search
AE.ALN.--.HHZ 2017-09-18 05:40:16.180 45.0 0.84 s 5.5 mb 79.01° 60.3° System-search
DN.FAQ.--.HHZ 2017-09-18 05:40:16.509 257.5 1.26 s 6.1 mb 79.17° 59.6° System-search
OM.ASH.--.HHZ 2017-09-18 05:40:18.690 22.2 0.94 s 5.2 mb 79.52° 59.9° System-search
OM.SOH.--.HHZ 2017-09-18 05:40:18.900 375.6 1.14 s 5.6 mB_BB 79.68° 60.5° System-search
DN.HAT.--.HHZ 2017-09-18 05:40:18.950 444.6 1.38 s 5.6 mB_BB 79.64° 59.8° System-search
OM.SOH.--.HHZ 2017-09-18 05:40:19.400 48.5 1.10 s 5.4 mb 79.68° 60.5° System-search
DN.HAT.--.HHZ 2017-09-18 05:40:19.450 60.2 1.22 s 5.5 mb 79.64° 59.8° System-search
OM.BID.--.HHZ 2017-09-18 05:40:19.450 833.9 1.96 s 5.9 mB_BB 80.76° 61.7° System-search
DN.FAQ.--.HHZ 2017-09-18 05:40:19.460 3e+03 8.97 s 5.9 Mwp 79.17° 59.6° System-search
OM.BID.--.HHZ 2017-09-18 05:40:19.910 49.4 0.94 s 5.5 mb 80.76° 61.7° System-search
AE.MSF.--.HHZ 2017-09-18 05:40:20.579 129.7 1.50 s 5.7 mb 79.90° 59.3° System-search
AE.SHM.--.HHZ 2017-09-18 05:40:21.210 933.3 1.02 s 5.9 mB_BB 80.13° 58.5° System-search
AE.SHM.--.HHZ 2017-09-18 05:40:21.700 93.9 0.96 s 5.8 mb 80.13° 58.5° System-search
AE.ALN.--.HHZ 2017-09-18 05:40:22.490 1e+03 13.80 s 5.5 Mwp 79.01° 60.3° System-search
OM.ASH.--.HHZ 2017-09-18 05:40:29.500 1e+03 17.41 s 5.5 Mwp 79.52° 59.9° System-search
OM.MDH.--.HHZ 2017-09-18 05:40:32.420 11.1 1.04 s 4.8 mb 79.98° 59.4° System-search
OM.SOH.--.HHZ 2017-09-18 05:41:20.490 3e+03 67.84 s 5.9 Mwp 79.68° 60.5° System-search
AE.MSF.--.HHZ 2017-09-18 05:41:23.180 9e+03 69.17 s 6.3 Mwp 79.90° 59.3° System-search
OM.MDH.--.HHZ 2017-09-18 06:11:54.292 151.2 26.91 s 4.8 Ms_BB 79.98° 59.4° System-search
OM.ASH.--.HHZ 2017-09-18 06:12:03.429 216.8 23.31 s 5.0 Ms_BB 79.52° 59.9° System-search
DN.HAT.--.HHZ 2017-09-18 06:12:45.933 224.5 23.78 s 5.0 Ms_BB 79.64° 59.8° System-search
DN.NAZ.--.HHZ 2017-09-18 06:13:39.104 295.4 20.05 s 5.1 Ms_BB 79.33° 59.4° System-search
OM.SOH.--.HHZ 2017-09-18 06:13:57.944 284.4 20.92 s 5.1 Ms_BB 79.68° 60.5° System-search
OM.BID.--.HHZ 2017-09-18 06:15:41.361 2e+03 18.43 s 6.1 Ms_BB 80.76° 61.7° System-search
AE.ALN.--.HHZ 2017-09-18 06:17:12.018 786.2 16.72 s 5.6 Ms_BB 79.01° 60.3° System-search
Channel Phase Time Time Residual Dir. Event Distance Event Azimuth Automatic? Defined By Action
AE.JRN.--.HHZ P 2017-09-18 05:39:50.400 -7.50 s 77.02° 58.3° no Time System-search
BH.SAK.--.HHZ P 2017-09-18 05:39:51.789 1.70 s 75.65° 56.4° no Time System-search
AE.MZR.--.HHZ P 2017-09-18 05:39:56.279 0.30 s 76.67° 60.3° no Time System-search
AE.AJN.--.HHZ P 2017-09-18 05:40:06.720 0 s 78.60° 59.5° no Time System-search
DN.ASU.--.HHZ P 2017-09-18 05:40:08.910 0.50 s 78.90° 59.6° no Time System-search
AE.ALN.--.HHZ P 2017-09-18 05:40:09.240 0.20 s 79.01° 60.3° no Time System-search
DN.FAQ.--.HHZ P 2017-09-18 05:40:09.960 0.10 s 79.17° 59.6° no Time System-search
DN.NAZ.--.HHZ P 2017-09-18 05:40:10.240 -0.50 s 79.33° 59.4° no Time System-search
OM.MDH.--.HHZ P 2017-09-18 05:40:10.849 -3.40 s 79.98° 59.4° no Time System-search
OM.ASH.--.HHZ P 2017-09-18 05:40:11.890 0 s 79.52° 59.9° no Time System-search
AE.MSF.--.HHZ P 2017-09-18 05:40:12.099 -1.80 s 79.90° 59.3° no Time System-search
OM.SOH.--.HHZ P 2017-09-18 05:40:12.269 -0.40 s 79.68° 60.5° no Time System-search
DN.HAT.--.HHZ P 2017-09-18 05:40:12.500 0 s 79.64° 59.8° no Time System-search
AE.SHM.--.HHZ P 2017-09-18 05:40:14.380 -0.70 s 80.13° 58.5° no Time System-search
OM.BID.--.HHZ P 2017-09-18 05:40:19.400 0.90 s 80.76° 61.7° no System-search

Shake Maps

None

Ground Motion

None

Event 20170918-4

Time: 2017-09-18 05:28:05.210
Position:18.0007°S, 13.0018°W
Place:South Atlantic Ocean
Major Place:807 km W of Jamestown, Saint Helena
Depth:15.0 km
Magnitude:5.5 mb