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	3.5 million people
Tohoku	Japan	56000 people
Kanto	Japan	11000 people

Affected populated places. Areas of interest

Name	Region Province	Country	City class	Population	Distance
Ohama	Miyagi	Japan	Village	-	11 km
Ogatsu	Miyagi	Japan	Village	-	14 km
Tsukihama	Miyagi	Japan	Village	-	17 km
Terahama	Miyagi	Japan	Village	-	17 km
Onagawahama	Miyagi	Japan	Village	-	19 km
Nagatsura	Miyagi	Japan	Village	-	20 km
Yagawa	Miyagi	Japan	Village	-	21 km
Oritate	Miyagi	Japan	Village	-	23 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
Oenokawara	Miyagi	Japan	Village	-	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
Tadagoe	Miyagi	Japan	Village	-	45 km
Fujisawa	Iwate	Japan	Village	-	46 km
Kami-tsuyakawa	Iwate	Japan	Village	-	46 km
Hirawata	Miyagi	Japan	Village	-	47 km
Futsukamachi	Iwate	Japan	Village	-	47 km
Wakayanagi	Miyagi	Japan	Village	-	49 km
Tomari	Iwate	Japan	Village	-	49 km
Shimo-orikabe	Iwate	Japan	Village	-	49 km
Matsuyama	Miyagi	Japan	Village	-	51 km
Imaizumi	Iwate	Japan	Village	-	52 km
Takaki	Miyagi	Japan	Village	-	52 km
Semmaya	Iwate	Japan	Village	-	52 km
Tajiri	Miyagi	Japan	Village	-	52 km
Usuginu	Iwate	Japan	Village	-	53 km
Semine	Miyagi	Japan	Village	-	53 km
Wakuchi	Iwate	Japan	Village	-	54 km
Shinzeki	Miyagi	Japan	Village	-	54 km
Surisawa	Iwate	Japan	Village	-	54 km
Rikuzen-Takata	Iwate	Japan	Village	-	56 km
Takakiyomizu	Miyagi	Japan	Village	-	57 km
Shimomachi	Miyagi	Japan	Village	-	57 km
Schiogama	Miyagi	Japan	Village	-	57 km
Araya	Miyagi	Japan	Village	-	59 km
Ohara	Iwate	Japan	Village	-	59 km
Sawabe	Miyagi	Japan	Village	-	59 km
Tsukidate	Miyagi	Japan	Village	-	59 km
Shiogama	Miyagi	Japan	City	59000 people	59 km
Furukawa	Miyagi	Japan	City	76000 people	60 km
Arikabe	Miyagi	Japan	Village	-	60 km
Ryori	Iwate	Japan	Village	-	60 km
Ofunato	Iwate	Japan	Village	37000 people	61 km
Ichinoseki	Iwate	Japan	City	62000 people	63 km
Masaka	Miyagi	Japan	Village	-	64 km
Nagasaka	Iwate	Japan	Village	-	64 km
Yokamachi	Iwate	Japan	Village	-	65 km
Aka-nitta	Miyagi	Japan	Village	-	65 km
Naka-niida	Miyagi	Japan	Village	-	65 km
Sarusawa	Iwate	Japan	Village	-	65 km
Iwagasaki	Miyagi	Japan	Village	-	66 km
Yoshioka	Miyagi	Japan	Village	-	66 km
Okkirai	Iwate	Japan	Village	-	69 km
Setamai	Iwate	Japan	Village	-	69 km
Iwaeyama	Miyagi	Japan	Village	-	69 km
Ido	Miyagi	Japan	Village	-	69 km
Itsukushi	Iwate	Japan	Village	-	69 km
Hosokura	Miyagi	Japan	Village	-	70 km
Kawaguchi	Iwate	Japan	Village	-	71 km
Kawaguchi	Miyagi	Japan	Village	-	71 km
Sendai	Miyagi	Japan	Major city	1 million people	71 km
Shimo-miya	Miyagi	Japan	Village	-	73 km
Nekkomachi	Iwate	Japan	Village	-	74 km
Ryuoka	Miyagi	Japan	Village	-	75 km
Takihara	Iwate	Japan	Village	-	75 km
Higashi-onoda	Miyagi	Japan	Village	-	75 km
Nenoshiroishi	Miyagi	Japan	Village	-	76 km
Miyasaki	Miyagi	Japan	Village	-	76 km
Kitamata	Iwate	Japan	Village	-	77 km
Iinosaka	Miyagi	Japan	Village	-	78 km
Kawatabi	Miyagi	Japan	Village	-	78 km
Ide	Iwate	Japan	Village	-	79 km
Hongo	Iwate	Japan	Village	-	79 km
Tamoyama	Iwate	Japan	Village	-	80 km
Maesawa	Iwate	Japan	Village	-	80 km
Mizusawa	Iwate	Japan	City	61000 people	81 km
Hakoguchi	Yamagata	Japan	Village	-	168 km
Kinomata	Yamagata	Japan	Village	-	171 km
Igazuchi	Niigata	Japan	Village	-	174 km
Yanagyudo	Niigata	Japan	Village	-	178 km
Nunobe	Niigata	Japan	Village	-	179 km
Wakikawa	Niigata	Japan	Village	-	188 km
Sasagawa	Niigata	Japan	Village	-	191 km
Hayakawa	Niigata	Japan	Village	-	192 km
Iwagasaki	Niigata	Japan	Village	-	193 km
Ani	Akita	Japan	Village	-	195 km
Hanawa	Akita	Japan	Village	-	200 km
Dogawa	Akita	Japan	Village	-	206 km
Isohara	Ibaraki	Japan	Village	-	207 km
Yonaizawa	Akita	Japan	Village	-	209 km
Yasuda	Akita	Japan	Village	-	222 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	39 km
Kasuminome		5				0	69 km
Ojojibara		70				0	69 km
Sendai	SDJ	5	Civ.	Paved	Yes	9800	76 km
Hanamaki	HNA	91	Civ.	Paved	Yes	6500	111 km
Junmachi	GAJ	108	Civ.	Paved	Yes	6500	111 km

Ports

Name	LOCODE	Country	Distance
Onagawa	JPONG	Japan	18 km
Ishinomaki	JPISM	Japan	30 km
Kesennuma Ko		Japan	40 km
Shiogama	JPSGM	Japan	57 km
Ofunato	JPOFT	Japan	61 km
Kamaishi	JPKIS	Japan	87 km
Soma	JPSMA	Japan	96 km
Yamada		Japan	109 km

Dams

Reservoir	Dam Name	River	Year	Distance
Naganuma	Naganuma	Hazamagawa	2005	48 km
Kejonuma	Kejonuma	Tajirigawa	1995	60 km
Nanatsumoriko	Minamikawa	Minamikawa	1987	72 km
Hanayamako	Hanayama	Hazamagawa	2004	74 km
Kurikoma	Kurikoma	Sanhazamagawa	1961	77 km
Tarumizuko	Tarumizu	Masudagawa	1976	79 km
Nanakita	Nanakita	Nanakitagawa	1984	81 km
Okurako	Okura	Okuragawa	1961	84 km
Araoko	Naruko	Eaigawa	1958	86 km
Meigenko	Urushizawa	Narusegawa	1980	87 km
Kamafusako	Kamafusa	Goishigawa	1970	89 km
	Isawa	Isawa	2013	92 km
Ishibuchiko	Ishibuchi	Isawagawa	1953	93 km
Senganishitameike	Senganishi	Shukunaigawa	1934	96 km
Ishibane	Ishibane	Wagagawa	1954	106 km
Oyasukyoko	Minase	Minasegawa	1963	106 km
Kawarago	Kawarago	Shiroishigawa	1968	111 km
Okuatsumiko	Atsumigawa	Atsumigawa	1986	172 km
Miomotechosuichi	Miomote	Miomotegawa	1953	178 km
Iwafune	Iwafune	Arakawa	1961	181 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
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