Very strong mag. 6.7 earthquake - North Pacific Ocean, 88 km northeast of Iwaki, Fukushima, Japan, on Tuesday, April 7, 1987 at 00:40 (GMT)

Very strong mag. 6.7 earthquake - North Pacific Ocean, 88 km northeast of Iwaki, Fukushima, Japan, on Tuesday, April 7, 1987 at 00:40 (GMT)

Very strong magnitude 6.7 earthquake at 29 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Apr 7, 1987 00:40:43 UTC
Magnitude: 6.7
Depth: 29.4 km
Epicenter latitude / longitude: 37.363°N / 141.796°E (North Pacific Ocean, Japan)
Antipode: 37.363°S / 38.204°W
Nearest volcano: Aoso (131 km / 81 mi)
Nearby towns and cities:
72 km (44 mi) E of Namie (Futaba-gun) (pop: 21,900) --> See nearby quakes!
88 km (55 mi) ENE of Iwaki (pop: 357,300) --> See nearby quakes!
125 km (78 mi) ESE of Fukushima (pop: 294,200) --> See nearby quakes!
125 km (78 mi) E of Kōriyama (pop: 340,600) --> See nearby quakes!
125 km (78 mi) SSE of Ishinomaki (pop: 117,200) --> See nearby quakes!
130 km (80 mi) SE of Sendai (pop: 1,063,100) --> See nearby quakes!
159 km (99 mi) SE of Yamagata (pop: 254,500) --> See nearby quakes!
164 km (102 mi) NE of Mito (pop: 246,500) --> See nearby quakes!
250 km (156 mi) NE of Saitama (pop: 1,193,400) --> See nearby quakes!
265 km (164 mi) NE of Tokyo (pop: 8,336,600) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 7.1 x 1014 joules (197 gigawatt hours, equivalent to 1.7 x 105 tons of TNT or 10.6 atomic bombs!) More info
Show interactive Map
[smaller] [bigger]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
If you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable to earthquake science, seismic hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
6.729 kmnear the east coast of Honshu, JapanUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.
Volcanoes & Earthquakes - new app for Android

Aftershocks

[More info]

Recorded aftershocks, latest first (34 quakes)

Date and timeMag
Depth
LocationDetails
Sep 24, 1987 04:55
34 years ago
5.9

42 km
North Pacific Ocean, 58 km E of Hitachi, Ibaraki, JapanMore
Aug 29, 1987 10:12
34 years ago
4.7

39 km
North Pacific Ocean, 179 km SE of Ishinomaki, Honshu-miyagi-ken, JapanMore
Aug 19, 1987 00:35
34 years ago
4.8

33 km
North Pacific Ocean, 116 km E of Iwaki, Fukushima, JapanMore
Aug 15, 1987 16:08
34 years ago
4.8

57 km
North Pacific Ocean, 63 km NE of Iwaki, Fukushima, JapanMore
Aug 14, 1987 23:22
34 years ago
4.9

53 km
North Pacific Ocean, 68 km E of Iwaki, Fukushima, JapanMore
Jul 11, 1987 13:31
34 years ago
5.6

39 km
North Pacific Ocean, 159 km E of Iwaki, Fukushima, JapanMore
Jul 8, 1987 03:28
34 years ago
4.8

44 km
North Pacific Ocean, 71 km E of Iwaki, Fukushima, JapanMore
Jul 4, 1987 02:15
34 years ago
4.6

33 km
North Pacific Ocean, 119 km E of Iwaki, Fukushima, JapanMore
Jul 2, 1987 11:38
34 years ago
4.6

64 km
North Pacific Ocean, 87 km NE of Iwaki, Fukushima, JapanMore
Jun 26, 1987 07:34
34 years ago
4.3

33 km
North Pacific Ocean, 105 km E of Iwaki, Fukushima, JapanMore
Jun 26, 1987 07:11
34 years ago
5.2

21 km
North Pacific Ocean, 109 km E of Iwaki, Fukushima, JapanMore
May 29, 1987 22:21
35 years ago
4.6

62 km
North Pacific Ocean, 40 km E of Iwaki, Fukushima, JapanMore
May 26, 1987 12:07
35 years ago
5.5

37 km
North Pacific Ocean, 91 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
May 10, 1987 12:23
35 years ago
5.1

40 km
North Pacific Ocean, 107 km NE of Iwaki, Fukushima, JapanMore
May 9, 1987 16:51
35 years ago
5.2

45 km
North Pacific Ocean, 113 km E of Hitachi, Ibaraki, JapanMore
May 5, 1987 07:03
35 years ago
4.2

33 km
North Pacific Ocean, 93 km E of Iwaki, Fukushima, JapanMore
May 5, 1987 05:19
35 years ago
4.7

90 km
North Pacific Ocean, 44 km NE of Iwaki, Fukushima, JapanMore
May 3, 1987 01:55
35 years ago
4.6

55 km
North Pacific Ocean, 57 km NE of Iwaki, Fukushima, JapanMore
May 1, 1987 23:06
35 years ago
5.1

48 km
North Pacific Ocean, 84 km E of Iwaki, Fukushima, JapanMore
Apr 30, 1987 14:11
35 years ago
4.5

50 km
North Pacific Ocean, 67 km E of Iwaki, Fukushima, JapanMore
Apr 30, 1987 13:46
35 years ago
4.9

61 km
North Pacific Ocean, 42 km E of Iwaki, Fukushima, JapanMore
Apr 27, 1987 16:59
35 years ago
5.2

49 km
North Pacific Ocean, 131 km SE of Ishinomaki, Honshu-miyagi-ken, JapanMore
Apr 25, 1987 18:34
35 years ago
4.2

60 km
North Pacific Ocean, 59 km E of Iwaki, Fukushima, JapanMore
Apr 24, 1987 04:32
35 years ago
4.6

57 km
North Pacific Ocean, 40 km NE of Iwaki, Fukushima, JapanMore
Apr 23, 1987 02:13
35 years ago
4.4

33 km
North Pacific Ocean, 80 km E of Iwaki, Fukushima, JapanMore
Apr 22, 1987 20:34
35 years ago
4.3

55 km
North Pacific Ocean, 62 km E of Iwaki, Fukushima, JapanMore
Apr 22, 1987 20:13
35 years ago
6.7

30 km
North Pacific Ocean, 62 km E of Iwaki, Fukushima, JapanMore
Apr 22, 1987 02:11
35 years ago
4.4

56 km
North Pacific Ocean, 67 km E of Iwaki, Fukushima, JapanMore
Apr 20, 1987 10:09
35 years ago
5.0

61 km
North Pacific Ocean, 72 km NE of Iwaki, Fukushima, JapanMore
Apr 18, 1987 01:08
35 years ago
4.9

32 km
North Pacific Ocean, 174 km E of Iwaki, Fukushima, JapanMore
Apr 16, 1987 19:23
35 years ago
6.1

55 km
North Pacific Ocean, 52 km E of Iwaki, Fukushima, JapanMore
Apr 16, 1987 00:56
35 years ago
4.1

118 km
Minamisōma Shi, 59 km E of Kōriyama, Fukushima, JapanMore
Apr 15, 1987 05:26
35 years ago
4.2

33 km
North Pacific Ocean, 90 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Apr 8, 1987 06:58
35 years ago
4.4

53 km
North Pacific Ocean, 110 km E of Iwaki, Fukushima, JapanMore

Earlier earthquakes in the same area

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version
Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.