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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