GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

M 5.5 in Japan from 18 Sep 2023 19:33 UTC to 19:33

Hazard models

Rapid Impact

Shakemap

Tsunami

Event summary

This earthquake is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

Earthquake Magnitude:	5.5M
Depth:	66.7 Km
Lat/Lon:	38.5129 , 141.6406
Event Date:	18 Sep 2023 19:33 UTC 19 Sep 2023 04:33 Local
Exposed Population:	2.9 million in MMI IV
Source:	NEIC us7000kwis
Inserted at:	18 Sep 2023 19:53 UTC
INFORM Coping capacity of the alert score:	1.5 (Japan)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Rapid Impact)		GDACS score
NEIC	0		0
us7000kwis	Scaled population (raster)	0
	C1 rapid impact	0
	C2 rapid impact	0
	Country Vulnerability	0
	INFORM_normalised	0

Maximum expected impact using different data sources.

The green area correspond to areas affected by strong shaking (MMI VI or higher) according to the simulation.

Episode Timeline

ID	Alert	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1526066		0	18 Sep 2023 19:33	5.5M, 66.7km	4.3	N/A (in MMI>=VII)	N/A	00:20	NEIC
1527219		0	18 Sep 2023 19:33	5.5M, 51km	3.87	N/A (in MMI>=VII)	N/A	6d 21:26	NEIC

The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.

The episode that has the last updated information.

* The max MMI detected for sources having shakemaps;
** The population detected in MMI>=7 for episode with shakemap or in a 100km radius;
*** The tsunami max height.

Rapid Impact

The results presented below are calculated with the ShakeMap open source software (USGS) using only earthquake hypocenter information to provide a rapid estimation of the ground motion and shaking intensity without taking into account any instrumental observations or earthquake source scaling laws.

Exposed population

The earthquake happened in Japan ,of Tohoku (population 492,851) . The alertlevel for this event is GREEN

Intensity	Population
	no people

Affected Provinces

Intensity	Region Province	Country	Population
	Tohoku	Japan	490000 people

Affected populated places. Areas of interest

Name	Region Province	Country	City class	Population	Distance
Ohama	Miyagi	Japan	Village	-	11 km
Tsukihama	Miyagi	Japan	Village	-	17 km
Terahama	Miyagi	Japan	Village	-	17 km
Yagawa	Miyagi	Japan	Village	-	21 km
Niiyama	Miyagi	Japan	Village	-	24 km
Shizugawa	Miyagi	Japan	Village	-	24 km
Isatomae	Miyagi	Japan	Village	-	25 km
Minato	Miyagi	Japan	Village	-	26 km
Oharahama	Miyagi	Japan	Village	-	26 km
Watanoha	Miyagi	Japan	Village	-	27 km
Oshika	Miyagi	Japan	Village	-	27 km
Iinogawa	Miyagi	Japan	Village	-	28 km
Nitoda	Miyagi	Japan	Village	-	31 km
Yanaizu	Miyagi	Japan	Village	-	31 km
Kamata	Miyagi	Japan	Village	-	31 km
Aji	Miyagi	Japan	Village	-	31 km
Ishinomaki	Miyagi	Japan	City	120000 people	32 km
Motoyoshi	Miyagi	Japan	Village	-	32 km
Oya	Miyagi	Japan	Village	-	34 km
Kamimachi	Miyagi	Japan	Village	-	35 km
Maeya	Miyagi	Japan	Village	-	36 km
Tsuya	Miyagi	Japan	Village	-	37 km
Matsuzaki	Miyagi	Japan	Village	-	37 km
Wabuchi	Miyagi	Japan	Village	-	39 km
Kesennuma	Miyagi	Japan	Village	59000 people	39 km
Shinden	Miyagi	Japan	Village	-	39 km
Nishino	Miyagi	Japan	Village	-	40 km
Sanuma	Miyagi	Japan	City	-	43 km
Wakuya	Miyagi	Japan	City	18000 people	43 km
Takagi	Miyagi	Japan	Village	-	44 km
Oyanagi	Miyagi	Japan	Village	-	45 km
Fujisawa	Iwate	Japan	Village	-	46 km
Hirawata	Miyagi	Japan	Village	-	47 km
Futsukamachi	Iwate	Japan	Village	-	47 km
Wakayanagi	Miyagi	Japan	Village	-	49 km
Matsuyama	Miyagi	Japan	Village	-	51 km
Tajiri	Miyagi	Japan	Village	-	52 km
Araya	Miyagi	Japan	Village	-	59 km
Furukawa	Miyagi	Japan	City	76000 people	60 km

see full list

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Intensity	Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)	Distance
	Matsushima		2	Civ.	Paved	Yes	8800	39 km

Ports

Intensity	Name	LOCODE	Country	Distance
	Ishinomaki	JPISM	Japan	30 km
	Kesennuma Ko		Japan	40 km

Dams

Intensity	Reservoir	Dam Name	River	Year	Distance
	Naganuma	Naganuma	Hazamagawa	2005	48 km

Nuclear plants

Intensity	Name	Country	Reactors	Distance
	ONAGAWA	JAPAN	3	18 km

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.