Geoscience Reference
In-Depth Information
Table 2a. Summary timeline of Great East Japan earthquake, tsunami, and nuclear disaster (part one)
Time (UTC)
Elapsed Time
(hrs/mins)
Entity
Action
9-Mar, 2:45
-2 days 3:01
NEIC
Foreshock: 02:45:20 UTC (Local time: 11:45), Mw: 7.3, 38.44°N, 142.84°E, Depth: 32 km
11-Mar, 5:46
0:00
NEIC
Mainshock: 05:46:24 UTC (Local time: 14:46), Mw: 9.0, 38.30°N, 142.37°E, Depth: 29 km
5:46:55
0:00:31
JMA
Earthquake Early Warning Issued
JM A
Data: Peak Acceleration of 2.7 g in Mi y a g i Prefecture ( Station MYG-004 NS )
5:47:59
0:01:35
5:48:24
0:02:00
JMA
Data: Peak Acceleration of 0.16g in Tokyo (Station TKY-026 EW)
05:49
0:03
JMA
Major Tsunami Warning : 3 Pref. (Iwate, Miyagi, Fukushima)
Tsunami warning : 5 zones, Advisory: 15 zones
05:55
0:09
NWPTAC
Event Estimate: 38.0 ° N, 142.9°E, M: 7.9 ,
(JMA)
Expected Tsunami heights issued for Western Pacific areas & Indonesia
05:55
0:09
PTWC
Event Estimate : 36.0°N 142.9°E, Depth 10 Km, M:7.9
Tsunami Warning: Japan, Russia, Marcus Is., N. Marianas, Guam, Wake Is., Taiwan
Tsunami Watch: Areas of Western and Central Pacific including Indonesia and Hawaii
06:12
0:26
PARI
Data: GPS wave meter, 18 Km offshore of Kamaishi at depth of 204 m, records 6.7 m wave height.
06:14
0:28
JMA
Tsunami Warning extended: Major Tsunami Warning : 6 Prefectures (Iwate, Miyagi, Fukushima,
Aomori, Ibaragi, Chiba) Tsunami warning: 7 zones, Advisory: 23 zones
06:15
0:29
NEIC
Aftershock : 06:15:41 UTC (Local Time: 15:15), Mw 7.9, 36.27°N, 141.11°E, depth: 48 km
06:18
0:32
PARI
Data: Ofunato Sea Level station records 8.0 m wave height
06:19
0:33
NOAA
Data: DART station 21418 records tsunami wave height of 1.08 m
A ftershock : 06:25:50 UTC ( Local Time: 15:25 ) , Mw 7.7, 38.06°N, 144.59°E, de p th: 18 km
06:25
0:39
NEIC
06:43
0:57
PTWC
Event Estimate Revised: 38.2°N, 142.5°E, Depth 10 km, M:8.8
Tsunami Warning for Japan, Russia, Marcus Is., N. Marianas
Tsunami Watch: Areas of Western and Central Pacific including Indonesia and Hawaii
07:05
1:19
NWPTAC
Event Estimate Revised : 38.1°N 142.9°E M: 8.4
(JMA)
Expected Tsunami heights issued for Western Pacific areas & Indonesia
JM A
Tsunami Warnin g extended: Ma j or Tsunami Warnin g : 17 zones
07:08
1:22
Tsunami warning : 19 zones, Advisory: 17 zones
07:30
1:44
PTWC
Tsunami Warning Extended : for Japan and majority of Pacific Basin including Russia, Australia,
Event Estimate Revised: 38.3°N, 142.4°E, De p th 24 km, M:8.9
08:30
2:44
PTWC
08:48
3:02
JMA
Event Estimate Revised: 38.1°N, 142.9°E Depth 20 km, M: 8.8
09:30
3:44
PTWC
Tsunami Warning area reduced: Australia and New Zealand are deleted from warning area.
10:03
4:17
JCO
Nuclear Emergency Status declared by office of the Prime Minister
10:05
4:19
WCATWC
Tsunami Warning: California, Oregon, Alaska (Amchitka to Attsu)
 
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