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Very strong mag. 6.9 earthquake - 129 km east of Ishinomaki, Honshu-miyagi-ken, Japan, on Sunday, January 18, 1981 at 18:17 GMT

Very strong mag. 6.9 earthquake - 129 km east of Ishinomaki, Honshu-miyagi-ken, Japan, on Sunday, January 18, 1981 at 18:17 GMT

Very strong magnitude 6.9 earthquake at 33 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Jan 18, 1981 18:17:24 UTC
Magnitude: 6.9
Depth: 33.0 km
Epicenter latitude / longitude: 38.64°N / 142.75°E (North Pacific Ocean, Japan)
Antipode: 38.64°S / 37.25°W
Nearest volcano: Kurikoma (173 km / 107 mi)
Nearby towns and cities:
102 km (63 mi) ESE of Ofunato (pop: 35,400) --> See nearby quakes!
104 km (65 mi) SE of Kamaishi (pop: 43,100) --> See nearby quakes!
129 km (80 mi) ENE of Ishinomaki (pop: 117,200) --> See nearby quakes!
144 km (89 mi) E of Ichinoseki (pop: 63,000) --> See nearby quakes!
156 km (97 mi) E of Furukawa (pop: 76,300) --> See nearby quakes!
158 km (98 mi) ESE of Kitakami (pop: 93,900) --> See nearby quakes!
169 km (105 mi) ENE of Sendai (pop: 1,063,100) --> See nearby quakes!
181 km (113 mi) SE of Morioka (pop: 295,200) --> See nearby quakes!
426 km (264 mi) NE of Tokyo (pop: 8,336,600) --> See nearby quakes!
450 km (280 mi) NE of Yokohama (pop: 3,574,400) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.4 x 1015 joules (392 gigawatt hours, equivalent to 3.4 x 105 tons of TNT or 21.1 atomic bombs!) | about seismic energy
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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
6.933 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.
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Aftershocks

[More info]

Recorded aftershocks, latest first (36 quakes)

Date and timeMag
Depth
LocationDetails
Jul 9, 1981 01:28
41 years ago
4.6

33 km
146 km E of Miyako, Iwate, JapanMore
Jul 9, 1981 00:13
41 years ago
4.5

61 km
86 km SE of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jul 1, 1981 23:06
41 years ago
4.7

53 km
104 km SE of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jul 1, 1981 04:51
41 years ago
4.7

33 km
165 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jun 8, 1981 20:56
41 years ago
4.7

33 km
142 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jun 6, 1981 18:25
41 years ago
4.2

57 km
65 km NE of Miyako, Iwate, JapanMore
Jun 2, 1981 02:31
41 years ago
4.9

33 km
114 km E of Iwaki, Fukushima, JapanMore
May 26, 1981 04:46
41 years ago
4.7

18 km
115 km SE of Sangan-jima Island, Iwate, JapanMore
Apr 13, 1981 03:04
41 years ago
5.7

28 km
117 km E of Iwaki, Fukushima, JapanMore
Apr 5, 1981 09:27
41 years ago
4.7

37 km
181 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Apr 2, 1981 12:58
41 years ago
4.5

24 km
112 km E of Miyako, Iwate, JapanMore
Mar 18, 1981 07:55
41 years ago
4.7

40 km
95 km E of Miyako, Iwate, JapanMore
Mar 3, 1981 22:48
41 years ago
4.7

55 km
85 km SE of Kamaishi, Iwate, JapanMore
Feb 25, 1981 13:02
41 years ago
5.0

17 km
160 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Feb 24, 1981 18:04
41 years ago
5.7

33 km
139 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Feb 23, 1981 20:40
41 years ago
4.7

29 km
140 km SE of Miyako, Iwate, JapanMore
Feb 23, 1981 09:21
41 years ago
5.7

33 km
136 km SE of Miyako, Iwate, JapanMore
Feb 22, 1981 03:09
41 years ago
4.9

31 km
90 km SE of Hachinohe, Aomori, JapanMore
Feb 14, 1981 15:34
41 years ago
4.4

158 km
113 km E of Iwaki, Fukushima, JapanMore
Jan 27, 1981 13:21
41 years ago
4.4

33 km
182 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 26, 1981 09:48
41 years ago
4.2

89 km
107 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 25, 1981 00:33
41 years ago
4.5

54 km
56 km SE of Kamaishi, Iwate, JapanMore
Jan 23, 1981 10:22
41 years ago
5.9

33 km
132 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 22, 1981 19:34
41 years ago
6.4

20 km
122 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 22, 1981 13:54
41 years ago
4.7

33 km
156 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 22, 1981 08:09
41 years ago
5.1

32 km
129 km SE of Kamaishi, Iwate, JapanMore
Jan 20, 1981 07:27
41 years ago
4.5

33 km
110 km SE of Kamaishi, Iwate, JapanMore
Jan 20, 1981 00:20
41 years ago
4.7

33 km
181 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 20, 1981 00:13
41 years ago
4.7

33 km
165 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 19, 1981 14:02
41 years ago
5.2

33 km
130 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 19, 1981 02:42
41 years ago
5.4

33 km
150 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 19, 1981 01:14
41 years ago
6.1

33 km
139 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 19, 1981 00:30
41 years ago
4.9

33 km
171 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 18, 1981 21:09
41 years ago
4.8

33 km
161 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore
Jan 18, 1981 20:35
41 years ago
5.1

33 km
83 km SE of Kamaishi, Iwate, JapanMore
Jan 18, 1981 20:34
41 years ago
5.0

33 km
132 km E of Ishinomaki, Honshu-miyagi-ken, JapanMore

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