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.

ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.

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 ,of Tohoku (population 9,984,608) . The alertlevel for this event is GREEN

Intensity	Population
	no people

Shakemaps Timeline

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1526066	141.641/38.513	5.5	66.7	4.221	18 Sep 2023 19:57	00:24	(new episode)
2	1526066	141.641/38.513	5.5	66.7	4.221	18 Sep 2023 20:09	00:36	(upd of #1)
3	1526066	141.624/38.559	5.5	64.4	4.247	18 Sep 2023 20:34	01:01	(upd of #2)
4	1526066	141.624/38.559	5.5	64.4	4.247	18 Sep 2023 21:37	02:04	(upd of #3)
5	1526066	141.624/38.559	5.5	64.4	4.247	19 Sep 2023 19:40	1d 00:07	(upd of #4)
6	1527219	141.657/38.522	5.5	51	3.832	25 Sep 2023 23:53	7d 04:20	(new episode)

Affected Provinces

Region Province	Country	Population
Tohoku	Japan	1.1 million people
Tohoku	Japan	3.7 million people
Kanto	Japan	4800 people

Affected populated places. Areas of interest

Name	Region Province	Country	City class	Population	Distance
Ohama	Miyagi	Japan	Village	-	12 km
Ogatsu	Miyagi	Japan	Village	-	16 km
Terahama	Miyagi	Japan	Village	-	17 km
Tsukihama	Miyagi	Japan	Village	-	18 km
Onagawahama	Miyagi	Japan	Village	-	21 km
Nagatsura	Miyagi	Japan	Village	-	21 km
Yagawa	Miyagi	Japan	Village	-	23 km
Oritate	Miyagi	Japan	Village	-	24 km
Isatomae	Miyagi	Japan	Village	-	24 km
Shizugawa	Miyagi	Japan	Village	-	25 km
Niiyama	Miyagi	Japan	Village	-	25 km
Minato	Miyagi	Japan	Village	-	26 km
Oharahama	Miyagi	Japan	Village	-	28 km
Oshika	Miyagi	Japan	Village	-	28 km
Watanoha	Miyagi	Japan	Village	-	29 km
Iinogawa	Miyagi	Japan	Village	-	30 km
Motoyoshi	Miyagi	Japan	Village	-	32 km
Yanaizu	Miyagi	Japan	Village	-	32 km
Nitoda	Miyagi	Japan	Village	-	32 km
Kamata	Miyagi	Japan	Village	-	33 km
Oya	Miyagi	Japan	Village	-	33 km
Aji	Miyagi	Japan	Village	-	33 km
Ishinomaki	Miyagi	Japan	City	120000 people	33 km
Matsuzaki	Miyagi	Japan	Village	-	36 km
Tsuya	Miyagi	Japan	Village	-	36 km
Kamimachi	Miyagi	Japan	Village	-	36 km
Maeya	Miyagi	Japan	Village	-	37 km
Kesennuma	Miyagi	Japan	Village	59000 people	38 km
Oenokawara	Miyagi	Japan	Village	-	39 km
Wabuchi	Miyagi	Japan	Village	-	40 km
Shinden	Miyagi	Japan	Village	-	41 km
Nishino	Miyagi	Japan	Village	-	41 km
Sanuma	Miyagi	Japan	City	-	44 km
Tadagoe	Miyagi	Japan	Village	-	44 km
Wakuya	Miyagi	Japan	City	18000 people	45 km
Takagi	Miyagi	Japan	Village	-	46 km
Fujisawa	Iwate	Japan	Village	-	46 km
Kami-tsuyakawa	Iwate	Japan	Village	-	46 km
Oyanagi	Miyagi	Japan	Village	-	47 km
Futsukamachi	Iwate	Japan	Village	-	47 km
Hirawata	Miyagi	Japan	Village	-	49 km
Shimo-orikabe	Iwate	Japan	Village	-	49 km
Wakayanagi	Miyagi	Japan	Village	-	49 km
Semmaya	Iwate	Japan	Village	-	52 km
Matsuyama	Miyagi	Japan	Village	-	53 km
Usuginu	Iwate	Japan	Village	-	53 km
Tajiri	Miyagi	Japan	Village	-	53 km
Takaki	Miyagi	Japan	Village	-	54 km
Wakuchi	Iwate	Japan	Village	-	54 km
Semine	Miyagi	Japan	Village	-	54 km
Rikuzen-Takata	Iwate	Japan	Village	-	55 km
Shinzeki	Miyagi	Japan	Village	-	56 km
Takakiyomizu	Miyagi	Japan	Village	-	58 km
Shimomachi	Miyagi	Japan	Village	-	59 km
Schiogama	Miyagi	Japan	Village	-	59 km
Sawabe	Miyagi	Japan	Village	-	59 km
Tsukidate	Miyagi	Japan	Village	-	60 km
Araya	Miyagi	Japan	Village	-	60 km
Arikabe	Miyagi	Japan	Village	-	60 km
Shiogama	Miyagi	Japan	City	59000 people	61 km
Furukawa	Miyagi	Japan	City	76000 people	61 km
Ichinoseki	Iwate	Japan	City	62000 people	64 km
Masaka	Miyagi	Japan	Village	-	65 km
Iwagasaki	Miyagi	Japan	Village	-	66 km
Naka-niida	Miyagi	Japan	Village	-	67 km
Tomari	Iwate	Japan	Village	-	48 km
Imaizumi	Iwate	Japan	Village	-	51 km
Surisawa	Iwate	Japan	Village	-	54 km
Ohara	Iwate	Japan	Village	-	58 km
Ryori	Iwate	Japan	Village	-	59 km
Ofunato	Iwate	Japan	Village	37000 people	60 km
Nagasaka	Iwate	Japan	Village	-	64 km
Yokamachi	Iwate	Japan	Village	-	65 km
Sarusawa	Iwate	Japan	Village	-	65 km
Aka-nitta	Miyagi	Japan	Village	-	66 km
Okkirai	Iwate	Japan	Village	-	67 km
Setamai	Iwate	Japan	Village	-	68 km
Yoshioka	Miyagi	Japan	Village	-	68 km
Itsukushi	Iwate	Japan	Village	-	70 km
Iwaeyama	Miyagi	Japan	Village	-	70 km
Kawaguchi	Iwate	Japan	Village	-	70 km
Ido	Miyagi	Japan	Village	-	71 km
Hosokura	Miyagi	Japan	Village	-	71 km
Kawaguchi	Miyagi	Japan	Village	-	72 km
Sendai	Miyagi	Japan	Major city	1 million people	73 km
Nekkomachi	Iwate	Japan	Village	-	74 km
Shimo-miya	Miyagi	Japan	Village	-	74 km
Takihara	Iwate	Japan	Village	-	76 km
Ryuoka	Miyagi	Japan	Village	-	76 km
Higashi-onoda	Miyagi	Japan	Village	-	77 km
Kitamata	Iwate	Japan	Village	-	77 km
Miyasaki	Miyagi	Japan	Village	-	77 km
Nenoshiroishi	Miyagi	Japan	Village	-	77 km
Hongo	Iwate	Japan	Village	-	78 km
Ide	Iwate	Japan	Village	-	79 km
Tamoyama	Iwate	Japan	Village	-	79 km
Kawatabi	Miyagi	Japan	Village	-	80 km
Iinosaka	Miyagi	Japan	Village	-	80 km
Maesawa	Iwate	Japan	Village	-	80 km
Kutsukake	Iwate	Japan	Village	-	80 km
Mizusawa	Iwate	Japan	City	61000 people	81 km
Shirahama	Iwate	Japan	Village	-	82 km
Hitokabe	Iwate	Japan	Village	-	83 km
Arahama	Miyagi	Japan	Village	-	84 km
Esashi	Iwate	Japan	Village	33000 people	84 km
Ohashi	Iwate	Japan	Village	-	84 km
Otomomachi	Iwate	Japan	Village	-	85 km
Naruko	Miyagi	Japan	Village	-	85 km
Kamaishi	Iwate	Japan	City	42000 people	85 km
Hosokura	Miyagi	Japan	Village	-	86 km
Kadozawa	Miyagi	Japan	Village	-	87 km
Akabane	Iwate	Japan	Village	-	88 km
Shirasawa	Miyagi	Japan	Village	-	88 km
Watari	Miyagi	Japan	Village	36000 people	88 km
Sekibukuro	Iwate	Japan	Village	-	89 km
Hanagama	Miyagi	Japan	Village	-	89 km
Baba	Miyagi	Japan	Village	-	90 km
Tono	Iwate	Japan	Village	27000 people	91 km
Okubo	Iwate	Japan	Village	-	91 km
Ryoishi	Iwate	Japan	Village	-	91 km
Yamashita	Miyagi	Japan	Village	-	92 km
Fudaba	Iwate	Japan	Village	-	92 km
Sasanagane	Iwate	Japan	Village	-	93 km
Hirose	Iwate	Japan	Village	-	94 km
Murata	Miyagi	Japan	Village	-	94 km
Sawa	Iwate	Japan	Village	-	94 km
Nakayama	Yamagata	Japan	Village	-	94 km
Ganyu	Miyagi	Japan	Village	-	94 km
Sakamoto	Miyagi	Japan	Village	-	94 km
Kakuda	Miyagi	Japan	Village	33000 people	94 km
Hara	Miyagi	Japan	Village	-	95 km
Kaegura	Iwate	Japan	Village	-	95 km
Kawasaki	Miyagi	Japan	Village	-	96 km
Anto	Iwate	Japan	Village	-	97 km
Nonaka	Iwate	Japan	Village	-	98 km
Otsuchi	Iwate	Japan	Village	16000 people	98 km
Tomisawa	Yamagata	Japan	Village	-	99 km
Ogawara	Miyagi	Japan	Village	23000 people	99 km
Nagano	Miyagi	Japan	Village	-	99 km
Kitakami	Iwate	Japan	Village	93000 people	99 km
Tassobe	Iwate	Japan	Village	-	100 km
Oyasu	Akita	Japan	Village	-	101 km
Shuku	Iwate	Japan	Village	-	101 km
Tsuchisawa	Iwate	Japan	Village	-	102 km
Nakumura	Fukushima	Japan	Village	-	102 km
Mukaimachi	Yamagata	Japan	Village	-	103 km
Tsurumakida	Yamagata	Japan	Village	-	103 km
Kozawa	Iwate	Japan	Village	-	103 km
Shiroishi	Miyagi	Japan	Village	39000 people	103 km
Joyanagi	Iwate	Japan	Village	-	103 km
Marumori	Miyagi	Japan	Village	17000 people	104 km
Shinden	Yamagata	Japan	Village	-	104 km
Funakoshi	Iwate	Japan	Village	-	104 km
Kakenoshita	Iwate	Japan	Village	-	105 km
Ohori	Yamagata	Japan	Village	-	106 km
Hanamaki	Iwate	Japan	City	73000 people	107 km
Tokatta	Miyagi	Japan	Village	-	107 km
Yamada	Iwate	Japan	Village	20000 people	108 km
Washiaimori	Iwate	Japan	Village	-	108 km
Ishibane	Iwate	Japan	Village	-	109 km
Ashizawa	Yamagata	Japan	Village	-	110 km
Ohasama	Iwate	Japan	Village	-	110 km
Kashima	Fukushima	Japan	Village	-	110 km
Yamadera	Yamagata	Japan	Village	-	110 km
Osawa	Iwate	Japan	Village	-	110 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
Kasuminome		5				0	70 km
Ojojibara		70				0	70 km
Sendai	SDJ	5	Civ.	Paved	Yes	9800	77 km
Hanamaki	HNA	91	Civ.	Paved	Yes	6500	111 km
Junmachi	GAJ	108	Civ.	Paved	Yes	6500	113 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
Yamada		Japan	108 km
Miyako	JPMYK	Japan	127 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
Ishibane	Ishibane	Wagagawa	1954	106 km
Oyasukyoko	Minase	Minasegawa	1963	107 km
Kinshuko	Yuda	Wagagawa	1964	109 km
Kawarago	Kawarago	Shiroishigawa	1968	113 km
Tamanotameike	Tamano	Udagawa	1945	115 km
Masuzawa	Masuzawa	Izumitagawa	1963	117 km
			1991	118 km
Yokokawa	Yokokawa	Otagawa	1983	122 km
Maekawa	Maekawa	Maekawa	1982	132 km
Kamigo	Kamigo	Mogamigawa	1962	135 km
Goshoko	Gosho	Shizukuishigawa	1981	141 km
Nanbukatafujiko	Shijushida	Kitakamigawa	1968	144 km

Nuclear plants

Intensity	Name	Country	Reactors	Distance
	ONAGAWA	JAPAN	3	19 km
	FUKUSHIMA-DAIICHI	JAPAN	6	134 km

More information

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

Disclaimer
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