National Tsunami Warning Center, NOAA/NWS

Tsunami of 23 January, 2018

A major earthquake with a moment magnitude of 7.9 (USGS magnitude) occurred at 09:31:43 UTC 23 January, 2018 (day 23) and was located 167 m/288 km SE of Chiniak, AK (56.046N, 149.073W, 25.0 km/ 15.5 mi depth -- USGS location).

This earthquake produced a tsunami that was recorded at tide gages monitored by the National Tsunami Warning Center (NTWC). Many observatories provide data to the centers; such as the NOAA National Ocean Service, the U. of Hawaii Sea Level Center, the Chilean Navy, the Japan Meteorological Agency and the National Tidal Facility in Australia among others. Click on the site name to see a graph of the tsunami, when available. Listed wave heights are maximum amplitude in cm (above sea level). Observed Arrival time is the actual tsunami arrival time in UTC on gages where it could be determined. The Computed Arrival time is the estimated time of wave arrival computed at the NTWC based on the earthquake origin time and location. The Sample Interval column shows the time between data samples.

 

Travel Time Map
(click to enlarge)

Maximum Amplitude Graph
(click to enlarge)

 

Tide gage/
Measurement Location

Estimated Arrival Time
[UTC (J.Day)]

Observed Arrival time
[UTC (J.Day)]

Peak amplitude
(above sea level in cm)

Time of Peak Amplitude Measurement
[UTC (J.Day)]

Model Forecast Amplitude
(above sea level in cm)

Initial motion

Sample Interval
(min)

Data File
(Julian Day Starts
at 0000 UTC)

Alitak Bay, AK

1130 (023)

1123 (023)

8

1330 (023)

-

?

1

023, 024

Apia, Samoa

1925 (023)

1953 (023)

4

2016 (023)

-

?

1

023, 024

Arena Cove, CA

1330 (023)

1340 (023)

15

1441 (023)

9

?

1

023, 024

Atka, AK

1140 (023)

1134 (023)

4

1255 (023)

-

?

1

023, 024

Crescent City, Ca

1320 (023)

1331 (023)

25

1521 (023)

20

?

1

023, 024

Craig, AK

1200 (023)

1141 (023)

7

1202 (023)

-

?

15 sec

023, 024

Charleston, OR

1310 (023)

1318 (023)

7

1505 (023)

8

?

1

023, 024

Winter Harbour, BC

1155 (023)

1211 (023)

6

1400 (023)

-

?

1

023, 024

Elfin Cove, AK

1055 (023)

1102 (023)

6

1137 (023)

4

?

1

023, 024

West Flank Endeavour, BC

1150 (023)

1152 (023)

3

1202 (023)

-

?

15 sec

023, 024

Hanalei, HI

1415 (023)

1429 (023)

13

1505 (023)

4

?

10 sec

023, 024

Hilo, HI

1435 (023)

1446 (023)

18

1510 (023)

6

?

1

023, 024

Honokohua, HI

1440 (023)

1518 (023)

4

1638 (023)

-

?

10 sec

023, 024

Honolulu, HI

1430 (023)

1503 (023)

3

1510 (023)

8

?

-

023, 024

Kahului, HI

1430 (023)

1442 (023)

12

1704 (023)

14

?

1

023, 024

Kawaihae, HI

1435 (023)

1444 (023)

7

1533 (023)

3

?

-

023, 024

Kodiak, AK

1045 (023)

1054 (023)

23

1223 (023)

17

?

1

023, 024

Langara, BC

1110 (023)

1120 (023)

13

1130 (023)

4

?

1

023, 024

Midway Island

1410 (023)

1432 (023)

6

1500 (023)

2

?

1

023, 024

Moku O Loe, HI

1430 (023)

1455 (023)

3

1618 (023)

3

?

1

023, 024

Makai Pier, HI

1420 (023)

1431 (023)

14

1502 (023)

-

?

10 sec

023, 024

Nawiliwili, HI

1415 (023)

1427 (023)

3

1447 (023)

3

?

10 sec

023, 024

Nuku Hiva, PF

1845 (023)

1851 (023)

24

1924 (023)

-

?

1

023, 024

Old Harbor, AK

1055 (023)

1038 (023)

15

1051 (023)

-

?

15 sec

023, 024

Port Angeles, WA

1330 (023)

1342 (023)

8

1355 (023)

2

?

-

023, 024

Port Orford, OR

1305 (023)

1316 (023)

16

1327 (023)

9

?

1

023, 024

Papeete, PF

1940 (023)

1954 (023)

3

2019 (023)

-

?

1

023, 024

Port San Luis, CA

1420 (023)

1423 (023)

16

1632 (023)

13

?

1

023, 024

Rcm South Endeavour, BC

1150 (023)

1156 (023)

2

1203 (023)

-

?

15 sec

023, 024

Point Reyes, CA

1345 (023)

1349 (023)

12

1644 (023)

5

?

1

023, 024

Seldovia, AK

1145 (023)

1151 (023)

2

1240 (023)

4

?

1

023, 024

Seward, AK

1055 (023)

1110 (023)

10

1131 (023)

29

?

1

023, 024

San Francisco, CA

1415 (023)

1425 (023)

5

1505 (023)

3

?

1

023, 024

Sitka, AK

1100 (023)

1109 (023)

10

1118 (023)

10

?

1

023, 024

Yakutat, AK

1105 (023)

1110 (023)

14

1123 (023)

5

?

1

023, 024


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