National Tsunami Warning Center, NOAA/NWS
Samoa Islands Region Tsunami of 29 September 2009
An earthquake with a moment magnitude of 8.0 (USGS Magnitude) occurred at 1748 UTC 29 September 2009 (day 272) and was located in the Samoa Island Region (15.56 S, 172.07 W, 18 km depth - USGS location).
This earthquake produced a tsunami that was recorded at tide gages monitored at
the Tsunami Warning Centers. Many observatories provide data to the centers;
such as the NOAA National Ocean Service, the U. of Hawaii Sea Level Center, the
Chilean Navy, 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 arrival computed at the West
Coast/Alaska Tsunami Warning Center (NTWC) based on the origin time and location.
The Sample Interval column shows the time between samples.
For additional information about this tsunami event see the Pacific Tsunami
Warning Center's homepage, the USGS Samoa web page and the International Tsunami
Information Center's site.
|
Tide gage |
Peak amplitude (above sea level in cm) |
Observed Initial Arrival time (UTC) |
Computed Initial Arrival time (UTC) |
Initial motion |
Sample Interval (min) |
Data File (Julian Day Starts at 0000 UTC) |
|
216 |
1802 9-29-09 |
1806 9-29-09 |
rise |
1 |
||
|
78 |
1807 |
1819 |
rise |
1 |
||
|
15 |
1900 |
1853 |
|
6 |
||
|
2.4 |
|
1933 |
|
6 |
||
|
9 |
2000 |
1956 |
rise |
6 |
||
|
9 |
2015 |
2006 |
fall |
1 |
||
|
15 |
2102 |
2053 |
rise |
1 |
||
|
6 |
2055 |
2059 |
rise |
1 |
||
|
17.5 |
2145 |
2137 |
rise |
1 |
||
|
32 |
2211 |
2202 |
rise |
1 |
||
|
2.5 |
|
2225 |
|
1 |
||
|
12 |
2317 |
2256 |
rise |
1 |
||
|
20 |
2332 |
2320 |
rise |
1 |
||
|
28 |
2338 |
2321 |
rise |
1 |
||
|
18 |
2335 |
2321 |
rise |
1 |
||
|
6 |
0001 9-30-09 |
2321 |
|
1 |
||
|
17 |
0005 |
2329 |
fall |
1 |
||
|
36 |
0022 |
2349 |
fall |
1 |
||
|
23 |
0010 |
2355 |
|
1 |
||
|
20 |
|
0000 9-30-09 |
|
6 |
||
|
5.5 |
|
0108 |
|
1 |
||
|
10.5 |
|
0308 |
|
15 sec |
||
|
7 |
|
0313 |
|
1 |
||
|
10 |
0425 |
0326 |
rise |
1 |
||
|
16 |
|
0330 |
|
1 |
||
|
8 |
|
0338 |
|
1 |
||
|
14 |
0421 |
0339 |
rise |
15 sec |
||
|
6 |
|
0341 |
|
1 |
||
|
44 |
0415 |
0358 |
rise |
1 |
||
|
28 |
0430 |
0407 |
? |
1 |
||
|
39.4 |
0450 |
0402 |
rise |
1 |
||
|
25 |
|
0411 |
|
1 |
||
|
13 |
|
0415 |
|
1 |
||
|
4.0 |
|
0418 |
|
1 |
||
|
15 |
0439 |
0420 |
rise |
1 |
||
|
33 |
0444 |
0420 |
rise |
1 |
||
|
22 |
0442 |
0421 |
rise |
1 |
||
|
21.1 |
0443 |
0421 |
rise |
1 |
||
|
10 |
0448 |
0431 |
rise |
1 |
||
|
13 |
|
0432 |
|
1 |
||
|
13 |
0500 |
0432 |
rise |
1 |
||
|
8.3 |
0527 |
0452 |
rise |
1 |
||
|
Winter Harbor, BC, Canada |
7.1 |
0522 |
0452 |
rise |
1 |
|
|
3.6 |
|
0454 |
|
1 |
||
|
7 |
|
0454 |
|
1 |
||
|
16.8 |
0542 |
0506 |
rise |
1 |
||
|
61.5 |
0536 |
0506 |
|
1 |
||
|
12 |
0601 |
0507 |
|
1 |
||
|
7.3 |
0545 |
0512 |
rise |
1 |
||
|
8 |
|
0512 |
|
1 |
||
|
3.8 |
|
0513 |
|
1 |
||
|
5.7 |
0501 |
0514 |
|
15 sec |
||
|
2.5 |
|
0528 |
|
1 |
||
|
2.0 |
|
0534 |
|
1 |
||
|
8 |
0612 |
0539 |
|
1 |
||
|
2.3 |
|
0539 |
|
1 |
||
|
9 |
0641 |
0550 |
|
1 |
||
|
2 |
|
0558 |
|
15 sec |
||
|
13 |
0649 |
0628 |
|
2 |
||
|
13.4 |
|
0628 |
|
1 |
||
|
22.6 |
0711 |
0650 |
|
2 |
||
|
10.8 |
|
0653 |
|
2 |
||
|
20 |
0805 |
0724 |
|
2 |
||
|
18.5 |
0755 |
0724 |
fall |
2 |
||
|
31.0 |
0802 |
0737 |
fall |
2 |
||
|
39.7 |
0823 |
0749 |
|
2 |
||
|
32.1 |
|
0758 |
|
6 |
||
|
36.6 |
0839 |
0818 |
|
2 |
||
|
24 |
0926 |
0833 |
|
2 |
||
|
26.4 |
0949 |
0844 |
|
2 |
