July 23, 1982 Tsunami: Ibaraki, Japan

Name: July 23, 1982 Tsunami: Ibaraki, Japan
Start: 1982-07-23
Location: Ibaraki, Japan

July 23, 1982 · 0.4 m · Definite tsunami

A tsunami caused by a magnitude 7.2 earthquake began at Ibaraki, Japan on July 23, 1982 at 14:23:53 UTC. The water rose as high as 0.4 meters. Its effects were recorded at 22 places.

Where the waves reached

The source (white) and every runup with a place, colored by the water height recorded there. A ring is a runup NCEI marks doubtful.

Under 1 m
1 to 3 m
3 to 10 m
10 to 30 m
30 m and more
Height not recorded

Tsunami warnings in force

The tsunami

Date: July 23, 1982, 14:23:53 UTC
Source: Ibaraki, Japan
Cause: Earthquake
Earthquake: Magnitude 7.2, 37 km deep
Maximum water height: 0.4 m (1.3 ft)
Runups recorded: 22
Tsunami intensity (Soloviev-Imamura): -1
Tsunami magnitude (Iida): -1.3
Waters: Ocean
How certain: Definite tsunami
Source location: 36.194° N, 141.702° E

The toll

The record gives no deaths, injuries or damage for this tsunami.

What the record says

NCEI’s account, from the sources it cites.

A tsunami was generated by an earthquake (Ms 6.8) near Ibaraki, Japan at 14:23 UT.

Every runup

Nearest the source first. Heights are above sea level at the time; a tide gauge reads half the wave’s full height.

Where	Country	Km from source	Water height, m	Measured by
Choshi	Japan	90	0.06	Tide gauge (half the maximum wave height)
Kashima	Japan	95	0.06	Tide gauge (half the maximum wave height)
Hitachiko	Japan	102	0.11	Tide gauge (half the maximum wave height)
Oaraiko	Japan	102	0.13	Tide gauge (half the maximum wave height)
Hatachi	Japan	106	0.1
Onahama	Japan	109	0.1	Tide gauge (half the maximum wave height)
Katsuura	Japan	176	0.03	Tide gauge (half the maximum wave height)
Somako	Japan	192	0.09	Tide gauge (half the maximum wave height)
Mera	Japan	221	0.07	Tide gauge (half the maximum wave height)
Mera	Japan	221	0.09	Tide gauge (half the maximum wave height)
Ayukawa	Japan	234	0.19	Tide gauge (half the maximum wave height)
Sendaishinko	Japan	238	0.09	Tide gauge (half the maximum wave height)
Shiogama	Japan	241	0.04	Tide gauge (half the maximum wave height)
Ishinomaki	Japan	250	0.04	Tide gauge (half the maximum wave height)
Minami-Izu	Japan	310	0.05	Tide gauge (half the maximum wave height)
Miyake Island	Japan	311	0.03	Tide gauge (half the maximum wave height)
Ofunato	Japan	313	0.03	Tide gauge (half the maximum wave height)
Kozushima	Japan	321	0.05	Tide gauge (half the maximum wave height)
Kamaishi	Japan	341	0.06	Tide gauge (half the maximum wave height)
Miyako	Japan	384	0.03	Tide gauge (half the maximum wave height)
Yaene, Hachijo Island	Japan	386	0.03	Tide gauge (half the maximum wave height)
Hachinohe	Japan	482	0.04	Tide gauge (half the maximum wave height)

Every tsunami in 1982 The 1900s Tsunamis of Japan The earthquake This day in weather history Alerts in force

Sources

Tsunami events and runups from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI tsunami event 2136.