J1 Earthquake Early Warning
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Quake Time Epicenter Latitude Longitude Depth Magnitude Intensity Remarks
21:55 JST 19 Apr 2011 Iwate-ken Oki 50 km 4.3 40.1 N 142.1 E4 No tsunami alerts
23:10 JST 19 Apr 2011 Ibaraki-ken Nambu 50 km 5.0 36.2 N 139.8 E4 Intensity correction
23:47 JST 19 Apr 2011 Fukushima-ken Oki 10 km 4.5 36.9 N 140.9 E4 No tsunami alerts
17:18 JST 21 Apr 2011 Miyagi-ken Oki 20 km 5.3 38.3 N 142.2 E4 No tsunami alerts
22:37 JST 21 Apr 2011 Chiba-ken Toho-oki 70 km 6.0 35.6 N 140.9 E5 lower No tsunami alerts
22:37 JST 21 Apr 2011 Chiba-ken Toho-oki 70 km 6.0 35.6 N 140.9 E5 lower Intensity correction
00:25 JST 23 Apr 2011 Fukushima-ken Oki 20 km 5.6 37.2 N 141.3 E5 lower No tsunami alerts
00:25 JST 23 Apr 2011 Fukushima-ken Oki 20 km 5.6 37.2 N 141.3 E5 lower Intensity correction
08:15 JST 23 Apr 2011 Ibaraki-ken Hokubu 10 km 4.5 36.7 N 140.7 E4 No tsunami alerts
19:09 JST 24 Apr 2011 Fukushima-ken Hamadori 20 km 4.4 37.1 N 140.7 E4 No tsunami alerts
18:00 JST 25 Apr 2011 Ibaraki-ken Oki 30 km 5.0 36.2 N 141.1 E4 No tsunami alerts
18:00 JST 25 Apr 2011 Ibaraki-ken Oki 30 km 5.0 36.2 N 141.1 E4 Intensity correction
21:12 JST 26 Apr 2011 Ibaraki-ken Nambu 50 km 5.0 36.1 N 140.0 E4 No tsunami alerts
19:27 JST 27 Apr 2011 Nagano-ken Hokubu 20 km 4.5 36.8 N 138.6 E4 No tsunami alerts
18:28 JST 28 Apr 2011 Fukushima-ken Oki 40 km 5.7 37.4 N 141.8 E4 No tsunami alerts
18:28 JST 28 Apr 2011 Fukushima-ken Oki 40 km 5.7 37.4 N 141.8 E4 Intensity correction
15:54 JST 29 Apr 2011 Iwate-ken Oki 50 km 4.8 39.3 N 142.0 E4 No tsunami alerts
15:54 JST 29 Apr 2011 Iwate-ken Oki 50 km 4.8 39.3 N 142.0 E4 Intensity correction
14:06 JST 30 Apr 2011 Ibaraki-ken Oki 20 km 5.3 36.8 N 141.3 E4 No tsunami alerts
14:47 JST 30 Apr 2011 Fukushima-ken Oki 30 km 4.5 37.3 N 141.3 E4 No tsunami alerts
11:48 JST 01 May 2011 Fukushima-ken Oki 30 km 4.6 37.4 N 141.2 E4 No tsunami alerts
22:57 JST 03 May 2011 Fukushima-ken Hamadori 20 km 4.5 37.0 N 140.6 E4 No tsunami alerts
22:57 JST 03 May 2011 Fukushima-ken Hamadori 20 km 4.5 37.0 N 140.6 E4 Intensity correction
02:04 JST 06 May 2011 Fukushima-ken Hamadori 10 km 5.3 37.1 N 140.9 E5 lower No tsunami alerts
13:35 JST 07 May 2011 Fukushima-ken Aizu 10 km 4.6 37.7 N 139.9 E4 No tsunami alerts
05:52 JST 08 May 2011 Iwate-ken Oki 40 km 5.7 40.2 N 142.4 E4 No tsunami alerts
08:38 JST 10 May 2011 Ibaraki-ken Hokubu 10 km 4.4 36.7 N 140.7 E4 No tsunami alerts
23:01 JST 10 May 2011 Wakayama-ken Hokubu very shallow 4.1 34.2 N 135.2 E4 No tsunami alerts
08:36 JST 14 May 2011 Fukushima-ken Oki 30 km 5.7 37.3 N 141.7 E4 No tsunami alerts
00:53 JST 17 May 2011 Fukushima-ken Oki 40 km 4.7 37.4 N 141.4 E4 No tsunami alerts
16:24 JST 18 May 2011 Fukushima-ken Oki 40 km 4.3 37.2 N 141.5 E4 No tsunami alerts
09:46 JST 20 May 2011 Ibaraki-ken Oki 30 km 5.8 35.8 N 141.3 E4 No tsunami alerts
09:46 JST 20 May 2011 Ibaraki-ken Oki 30 km 5.8 35.8 N 141.3 E4 Intensity correction
16:28 JST 20 May 2011 Fukushima-ken Oki 40 km 5.2 37.5 N 141.5 E4 No tsunami alerts
17:53 JST 20 May 2011 Ibaraki-ken Nambu 70 km 4.6 36.0 N 140.1 E4 No tsunami alerts
17:53 JST 20 May 2011 Ibaraki-ken Nambu 70 km 4.6 36.0 N 140.1 E4 Intensity correction
07:06 JST 22 May 2011 Chiba-ken Hokutobu 40 km 5.5 35.8 N 140.7 E4 No tsunami alerts
07:06 JST 22 May 2011 Chiba-ken Hokutobu 40 km 5.5 35.8 N 140.7 E4 Intensity correction
05:36 JST 25 May 2011 Fukushima-ken Hamadori 10 km 5.1 37.1 N 140.9 E5 lower No tsunami alerts
19:56 JST 26 May 2011 Ibaraki-ken Hokubu 10 km 4.8 36.7 N 140.6 E4 No tsunami alerts
19:56 JST 26 May 2011 Ibaraki-ken Hokubu 10 km 4.8 36.7 N 140.6 E4 Intensity correction
12:34 JST 27 May 2011 Fukushima-ken Hamadori 10 km 4.7 37.1 N 140.9 E4 No tsunami alerts
22:33 JST 27 May 2011 Akita-ken Nairiku-nambu 20 km 4.5 39.6 N 140.7 E4 No tsunami alerts
21:28 JST 31 May 2011 Iwate-ken Oki 50 km 5.2 39.4 N 142.1 E4 No tsunami alerts
12:51 JST 02 Jun 2011 Niigata-ken Chuetsu-chiho very shallow 4.2 37.0 N 138.7 E4 No tsunami alerts
01:00 JST 04 Jun 2011 Fukushima-ken Oki 20 km 5.6 37.0 N 141.2 E5 lower No tsunami alerts
01:57 JST 04 Jun 2011 Shimane-ken Tobu 10 km 5.1 35.1 N 132.7 E4 No tsunami alerts
07:11 JST 09 Jun 2011 Iwate-ken Oki 30 km 5.1 39.0 N 142.5 E4 No tsunami alerts
07:11 JST 09 Jun 2011 Iwate-ken Oki 30 km 5.1 39.0 N 142.5 E4 Intensity correction
19:38 JST 09 Jun 2011 Ibaraki-ken Oki very shallow 5.7 36.5 N 140.9 E4 No tsunami alerts
19:38 JST 09 Jun 2011 Ibaraki-ken Oki very shallow 5.7 36.5 N 140.9 E4 Intensity correction
05:09 JST 12 Jun 2011 Fukushima-ken Oki 20 km 4.6 37.2 N 141.3 E4 No tsunami alerts
21:49 JST 14 Jun 2011 Kushiro Oki 70 km 5.0 43.1 N 145.4 E4 No tsunami alerts
20:31 JST 18 Jun 2011 Fukushima-ken Oki 30 km 5.9 37.6 N 141.9 E4 Intensity correction
17:22 JST 23 Jun 2011 Fukushima-ken Oki 50 km 4.4 37.1 N 141.2 E4 No tsunami alerts
19:35 JST 23 Jun 2011 Miyagi-ken Oki 60 km 5.3 38.5 N 141.6 E4 No tsunami alerts
19:35 JST 23 Jun 2011 Miyagi-ken Oki 60 km 5.3 38.5 N 141.6 E4 Intensity correction
08:16 JST 30 Jun 2011 Nagano-ken Chubu very shallow 5.5 36.2 N 138.0 E5 upper No tsunami alerts
08:21 JST 30 Jun 2011 Nagano-ken Chubu very shallow 5.1 36.2 N 138.0 E4 No tsunami alerts
14:11 JST 30 Jun 2011 Nagano-ken Chubu very shallow 3.9 36.2 N 138.0 E4 No tsunami alerts
02:11 JST 03 Jul 2011 Fukushima-ken Aizu 10 km 3.8 37.7 N 139.9 E4 No tsunami alerts
19:18 JST 05 Jul 2011 Wakayama-ken Hokubu 10 km 5.4 34.0 N 135.2 E5 upper No tsunami alerts
19:18 JST 05 Jul 2011 Wakayama-ken Hokubu 10 km 5.4 34.0 N 135.2 E5 upper Intensity correction
19:34 JST 05 Jul 2011 Wakayama-ken Hokubu 10 km 4.4 34.0 N 135.2 E4 No tsunami alerts
19:34 JST 05 Jul 2011 Wakayama-ken Hokubu 10 km 4.4 34.0 N 135.2 E4 Intensity correction
03:35 JST 08 Jul 2011 Fukushima-ken Oki 50 km 5.6 37.1 N 141.2 E4 Intensity correction
09:57 JST 10 Jul 2011 Sanriku Oki 10 km 7.1 38.0 N 143.5 E4 Tsunami alert issued
09:09 JST 11 Jul 2011 Fukushima-ken Hamadori 10 km 4.4 37.1 N 140.9 E4 No tsunami alerts
13:29 JST 11 Jul 2011 Iwate-ken Oki 50 km 5.0 39.3 N 142.1 E4 No tsunami alerts
18:00 JST 12 Jul 2011 Miyagi-ken Oki 60 km 4.9 38.8 N 142.1 E4 No tsunami alerts
05:47 JST 13 Jul 2011 Fukushima-ken Oki very shallow 5.3 37.3 N 141.3 E4 No tsunami alerts
21:01 JST 15 Jul 2011 Ibaraki-ken Nambu 60 km 5.5 36.3 N 140.1 E5 lower No tsunami alerts
21:01 JST 15 Jul 2011 Ibaraki-ken Nambu 60 km 5.5 36.3 N 140.1 E5 lower Intensity correction
04:18 JST 21 Jul 2011 Okinawa-honto Kinkai 60 km 5.3 27.2 N 128.3 E4 No tsunami alerts
13:34 JST 23 Jul 2011 Miyagi-ken Oki 40 km 6.5 38.9 N 142.2 E5 upper No tsunami alerts
13:34 JST 23 Jul 2011 Miyagi-ken Oki 40 km 6.5 38.9 N 142.2 E5 upper Intensity correction
23:32 JST 24 Jul 2011 Mie-ken Nambu 40 km 4.7 34.0 N 136.1 E4 No tsunami alerts
03:54 JST 31 Jul 2011 Fukushima-ken Oki 40 km 6.4 36.9 N 141.3 E5 upper No tsunami alerts
03:54 JST 31 Jul 2011 Fukushima-ken Oki 40 km 6.4 36.9 N 141.3 E5 upper Intensity correction
02:36 JST 01 Aug 2011 Urakawa Oki 40 km 5.4 41.7 N 143.0 E4 No tsunami alerts
22:44 JST 01 Aug 2011 Iwate-ken Oki 50 km 5.7 39.8 N 142.2 E4 No tsunami alerts
23:58 JST 01 Aug 2011 Suruga-wan 20 km 6.1 34.7 N 138.6 E5 lower Intensity correction
20:16 JST 05 Aug 2011 Fukushima-ken Hamadori 10 km 4.8 37.1 N 140.9 E4 No tsunami alerts
08:13 JST 10 Aug 2011 Wakayama-ken Hokubu 60 km 4.6 34.1 N 135.5 E4 No tsunami alerts
22:31 JST 11 Aug 2011 Miyagi-ken Oki 20 km 5.3 38.4 N 142.3 E4 No tsunami alerts
03:22 JST 12 Aug 2011 Fukushima-ken Oki 50 km 6.0 37.0 N 141.2 E5 lower No tsunami alerts
03:22 JST 12 Aug 2011 Fukushima-ken Oki 50 km 6.0 37.0 N 141.2 E5 lower Intensity correction
16:38 JST 14 Aug 2011 Ibaraki-ken Hokubu 10 km 4.3 36.7 N 140.6 E4 No tsunami alerts
09:23 JST 17 Aug 2011 Ibaraki-ken Nambu 80 km 4.4 36.1 N 139.8 E4 No tsunami alerts
09:23 JST 17 Aug 2011 Ibaraki-ken Nambu 80 km 4.4 36.1 N 139.8 E4 Intensity correction
12:05 JST 17 Aug 2011 Miyagi-ken Oki 40 km 5.2 38.4 N 142.2 E4 No tsunami alerts
14:36 JST 19 Aug 2011 Fukushima-ken Oki 20 km 6.8 37.6 N 141.9 E5 lower Tsunami alert issued
07:58 JST 21 Aug 2011 Miyagi-ken Oki 50 km 4.7 38.6 N 141.9 E4 No tsunami alerts
07:05 JST 22 Aug 2011 Fukushima-ken Oki 50 km 4.5 37.1 N 141.2 E4 No tsunami alerts
09:07 JST 22 Aug 2011 Tokachi-chiho Chubu 20 km 4.7 42.7 N 143.3 E4 No tsunami alerts
14:05 JST 27 Aug 2011 Ibaraki-ken Oki 20 km 4.3 36.7 N 140.8 E4 No tsunami alerts
07:27 JST 07 Sep 2011 Urakawa Oki 10 km 4.3 42.2 N 142.5 E4 No tsunami alerts
02:42 JST 13 Sep 2011 Ibaraki-ken Oki 50 km 4.4 36.6 N 140.9 E4 No tsunami alerts
17:00 JST 15 Sep 2011 Ibaraki-ken Oki 10 km 6.2 36.3 N 141.6 E4  
17:00 JST 15 Sep 2011 Ibaraki-ken Oki 10 km 6.2 36.3 N 141.6 E4 Intensity correction
04:26 JST 17 Sep 2011 Iwate-ken Oki 20 km 6.3 40.2 N 142.9 E4  
19:39 JST 18 Sep 2011 Urakawa Oki 60 km 4.9 42.0 N 142.4 E4 No tsunami alerts
22:30 JST 21 Sep 2011 Ibaraki-ken Hokubu 10 km 5.3 36.7 N 140.6 E5 lower Intensity correction
17:15 JST 23 Sep 2011 Ibaraki-ken Hokubu very shallow 5.1 36.7 N 140.6 E4 No tsunami alerts
16:49 JST 26 Sep 2011 Urakawa Oki very shallow 4.3 42.2 N 142.5 E4 No tsunami alerts
17:20 JST 26 Sep 2011 Fukushima-ken Aizu 10 km 4.1 37.7 N 139.9 E4 No tsunami alerts
22:46 JST 26 Sep 2011 Ibaraki-ken Hokubu 10 km 4.3 36.7 N 140.7 E4 No tsunami alerts
19:05 JST 29 Sep 2011 Fukushima-ken Oki very shallow 5.6 37.1 N 141.0 E5 upper No tsunami alerts
19:05 JST 29 Sep 2011 Fukushima-ken Oki very shallow 5.6 37.1 N 141.0 E5 upper Intensity correction
14:17 JST 05 Oct 2011 Iwate-ken Oki 20 km 4.8 40.2 N 142.0 E4 No tsunami alerts
19:06 JST 05 Oct 2011 Nagano-ken Hokubu 10 km 5.1 36.5 N 137.7 E4 No tsunami alerts
23:33 JST 05 Oct 2011 Kumamoto-ken Kumamoto-chiho 10 km 4.4 32.9 N 130.9 E5 upper No tsunami alerts
11:46 JST 10 Oct 2011 Fukushima-ken Oki 50 km 5.6 37.5 N 141.5 E4 No tsunami alerts
19:34 JST 03 Nov 2011 Ibaraki-ken Nambu 70 km 4.9 36.0 N 140.1 E4 No tsunami alerts
19:34 JST 03 Nov 2011 Ibaraki-ken Nambu 70 km 4.9 36.0 N 140.1 E4 Intensity correction
10:23 JST 20 Nov 2011 Ibaraki-ken Hokubu 10 km 5.5 36.7 N 140.6 E5 upper No tsunami alerts
10:23 JST 20 Nov 2011 Ibaraki-ken Hokubu 10 km 5.5 36.7 N 140.6 E5 upper Intensity correction
19:16 JST 21 Nov 2011 Hiroshima-ken Hokubu 10 km 5.4 34.9 N 132.9 E5 lower No tsunami alerts
19:16 JST 21 Nov 2011 Hiroshima-ken Hokubu 10 km 5.4 34.9 N 132.9 E5 lower Intensity correction
04:24 JST 24 Nov 2011 Fukushima-ken Oki 30 km 6.0 37.3 N 141.7 E4 No tsunami alerts
04:24 JST 24 Nov 2011 Fukushima-ken Oki 30 km 6.0 37.3 N 141.7 E4 Intensity correction
19:25 JST 24 Nov 2011 Urakawa Oki 30 km 6.1 41.7 N 142.8 E5 lower No tsunami alerts
04:35 JST 25 Nov 2011 Hiroshima-ken Hokubu 10 km 4.6 34.9 N 132.9 E4 No tsunami alerts
05:55 JST 03 Dec 2011 Chiba-ken Nambu 20 km 5.2 35.3 N 140.4 E4 No tsunami alerts
15:08 JST 10 Dec 2011 Miyagi-ken Oki 50 km 4.7 38.6 N 141.8 E4 No tsunami alerts
10:22 JST 11 Dec 2011 Amami-oshima Kinkai 40 km 5.4 28.2 N 129.5 E4 No tsunami alerts
Archive Earthquake Data
  JMA (final quake data) EEW (preliminary reports)
2011 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7
2012 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7
2013 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7
2014 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7
2015 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7
2016 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7
2017 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All 4 to 7