Overall Green Earthquake alert in Japan on 18 Sep 2023 19:33 UTC

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 on 18 Sep 2023 19:33 UTC

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:	51 Km
Lat/Lon:	38.5224 , 141.6574
Event Date:	18 Sep 2023 19:33 UTC 19 Sep 2023 04:33 Local
Exposed Population:	1.1 million in MMI IV
Source:	NEIC us7000kwis
Inserted at:	25 Sep 2023 16:59 UTC
INFORM Coping capacity of the alert score	1.5 (Japan)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us7000kwis	Scaled population (raster)	0
	C1 shakemap	0
	C2 shakemap	0
	Country Vulnerability	0
	INFORM_normalised	0

Maximum expected impact using different data sources.

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	4.27	N/A (in MMI>=VII)		00:20	NEIC
1527219		0	18 Sep 2023 19:33	5.5M, 51km	3.85	N/A (in MMI>=VII)		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.

Exposed population

The earthquake happened in Japan , Region of Tohoku (population 27,204) . The nearest places are Osu, Kumazawa, Kuwahama, Ohama, Tatsuhama, Funagoshi, Izushima, Terama, Ozashi, Ogatsu, and Sendai.

Radius	Population
100 km	2.7 million people
75 km	1.8 million people
50 km	430000 people
20 km	11000 people
10 km	<1000 people
5 km	no people
2 km	no people

Affected Provinces

Region Province	Country	Population
Tohoku	Japan	27000 people

Affected populated places

Name	Region Province	Country	City class	Population	Distance
Osu	Miyagi	Japan	Village	-	10 km
Kumazawa	Miyagi	Japan	Village	-	11 km
Kuwahama	Miyagi	Japan	Village	-	12 km
Ohama	Miyagi	Japan	Village	-	12 km
Tatsuhama	Miyagi	Japan	Village	-	12 km
Funagoshi	Miyagi	Japan	Village	-	13 km
Izushima	Miyagi	Japan	Village	-	14 km
Terama	Miyagi	Japan	Village	-	14 km
Ozashi	Miyagi	Japan	Village	-	15 km
Ogatsu	Miyagi	Japan	Village	-	16 km
Kodaki	Miyagi	Japan	Village	-	16 km
Aikawa	Miyagi	Japan	Village	-	17 km
Ommaehama	Miyagi	Japan	Village	-	17 km
Terahama	Miyagi	Japan	Village	-	17 km
Tsukihama	Miyagi	Japan	Village	-	18 km
Yoriiso	Miyagi	Japan	Village	-	19 km
Onagawahama	Miyagi	Japan	Village	-	21 km
Nagatsura	Miyagi	Japan	Village	-	21 km
Samenoura	Miyagi	Japan	Village	-	22 km
Tomarihama	Miyagi	Japan	Village	-	22 km
Tomari	Miyagi	Japan	Village	-	22 km
Yagawa	Miyagi	Japan	Village	-	23 km
Onagawa	Miyagi	Japan	Village	-	23 km
Aratohama	Miyagi	Japan	Village	-	23 km
Natari	Miyagi	Japan	Village	-	24 km
Oritate	Miyagi	Japan	Village	-	24 km
Isatomae	Miyagi	Japan	Village	-	24 km
Shizugawa	Miyagi	Japan	Village	-	25 km
Mizunuma	Miyagi	Japan	Village	-	25 km
Aramachi	Miyagi	Japan	Village	-	25 km
Niiyama	Miyagi	Japan	Village	-	25 km
Koamikura	Miyagi	Japan	Village	-	26 km
Minato	Miyagi	Japan	Village	-	26 km
Nojiri	Miyagi	Japan	Village	-	26 km
Fukkiura	Miyagi	Japan	Village	-	26 km
Takenohama	Miyagi	Japan	Village	-	27 km
Saragai	Miyagi	Japan	Village	-	27 km
Kobuchi	Miyagi	Japan	Village	-	28 km
Kukunari	Miyagi	Japan	Village	-	28 km
Oharahama	Miyagi	Japan	Village	-	28 km
Kitsunezaki	Miyagi	Japan	Village	-	28 km
Ayukawahama	Miyagi	Japan	Village	-	28 km
Kotake	Miyagi	Japan	Village	-	28 km
Kesaiso	Miyagi	Japan	Village	-	28 km
Oshika	Miyagi	Japan	Village	-	28 km
Watanoha	Miyagi	Japan	Village	-	29 km
Kagamiishi	Miyagi	Japan	Village	-	29 km
Kitazawa	Miyagi	Japan	Village	-	29 km
Haraigawa	Miyagi	Japan	Village	-	29 km
Higashi-Fukuda	Miyagi	Japan	Village	-	30 km
Iinogawa	Miyagi	Japan	Village	-	30 km
Inai	Miyagi	Japan	Village	-	30 km
Koizumi	Miyagi	Japan	Village	-	30 km
Odomari	Miyagi	Japan	Village	-	32 km
Kami-Hazawa	Miyagi	Japan	Village	-	32 km
Motoyoshi	Miyagi	Japan	Village	-	32 km
Kanomata	Miyagi	Japan	Village	-	32 km
Iwasaki	Miyagi	Japan	Village	-	32 km
Yanaizu	Miyagi	Japan	Village	-	32 km
Moto-Funaba	Miyagi	Japan	Village	-	32 km
Nitoda	Miyagi	Japan	Village	-	32 km
Hiraiso	Miyagi	Japan	Village	-	32 km
Ikenohama	Miyagi	Japan	Village	-	33 km
Kamata	Miyagi	Japan	Village	-	33 km
Ota	Miyagi	Japan	Village	-	33 km
Oya	Miyagi	Japan	Village	-	33 km
Aji	Miyagi	Japan	Village	-	33 km
Futawatashi	Miyagi	Japan	Village	-	33 km
Inohana	Miyagi	Japan	Village	-	33 km
Ishinomaki	Miyagi	Japan	City	120000 people	33 km
Magome	Miyagi	Japan	Village	-	34 km
Shirotori	Miyagi	Japan	Village	-	34 km
Asatanuki	Miyagi	Japan	Village	-	34 km
Shinzan	Miyagi	Japan	Village	-	34 km
Otsunagi	Miyagi	Japan	Village	-	34 km
Akuao	Miyagi	Japan	Village	-	35 km
Honchi	Miyagi	Japan	Village	-	36 km
Matsuzaki	Miyagi	Japan	Village	-	36 km
Tsuya	Miyagi	Japan	Village	-	36 km
Kamimachi	Miyagi	Japan	Village	-	36 km
Yamane	Miyagi	Japan	Village	-	37 km
Shimozaike	Iwate	Japan	Village	-	37 km
Maeya	Miyagi	Japan	Village	-	37 km
Karukome	Miyagi	Japan	Village	-	37 km
Kesennuma	Miyagi	Japan	Village	59000 people	38 km
Sakihama	Miyagi	Japan	Village	-	38 km
Shimo-Tsuyakawa	Iwate	Japan	Village	-	38 km
Morinokoshi	Miyagi	Japan	Village	-	38 km
Uranohama	Miyagi	Japan	Village	-	38 km
Sunaoshi	Miyagi	Japan	Village	-	38 km
Moriai	Miyagi	Japan	Village	-	39 km
Oenokawara	Miyagi	Japan	Village	-	39 km
Hirobuchi	Miyagi	Japan	Village	-	40 km
Nakase	Miyagi	Japan	Village	-	40 km
Wabuchi	Miyagi	Japan	Village	-	40 km
Tsurugaura	Miyagi	Japan	Village	-	40 km
Maeyachi	Miyagi	Japan	Village	-	40 km
Yoshizumi	Miyagi	Japan	Village	-	41 km
Shinden	Miyagi	Japan	Village	-	41 km
Kaminoki	Miyagi	Japan	Village	-	41 km

see full list

Critical infrastructure

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

Airports

Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)	Distance
Matsushima		2	Civ.	Paved	Yes	8800	40 km
Ojojibara		70				0	70 km
Kasuminome		5				0	70 km
Sendai	SDJ	5	Civ.	Paved	Yes	9800	77 km

Ports

Name	LOCODE	Country	Distance
Onagawa	JPONG	Japan	20 km
Ishinomaki	JPISM	Japan	32 km
Kesennuma Ko		Japan	39 km
Shiogama	JPSGM	Japan	59 km
Ofunato	JPOFT	Japan	60 km
Kamaishi	JPKIS	Japan	85 km
Soma	JPSMA	Japan	98 km

Dams

Reservoir	Dam Name	River	Year	Distance
Naganuma	Naganuma	Hazamagawa	2005	49 km
Kejonuma	Kejonuma	Tajirigawa	1995	62 km
Nanatsumoriko	Minamikawa	Minamikawa	1987	74 km
Hanayamako	Hanayama	Hazamagawa	2004	74 km
Kurikoma	Kurikoma	Sanhazamagawa	1961	77 km
Tarumizuko	Tarumizu	Masudagawa	1976	81 km
Nanakita	Nanakita	Nanakitagawa	1984	83 km
Okurako	Okura	Okuragawa	1961	86 km
Araoko	Naruko	Eaigawa	1958	87 km
Meigenko	Urushizawa	Narusegawa	1980	89 km
Kamafusako	Kamafusa	Goishigawa	1970	91 km
	Isawa	Isawa	2013	92 km
Ishibuchiko	Ishibuchi	Isawagawa	1953	93 km
Taseko	Tase	Sarugaishigawa	1954	96 km
Senganishitameike	Senganishi	Shukunaigawa	1934	96 km

Nuclear plants

Name	Country	Reactors	Distance
ONAGAWA	JAPAN	3	19 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.
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