Overall Green Earthquake alert in Japan on 16 Apr 2021 11:51 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 4.5 in Japan on 16 Apr 2021 11:51 UTC

Hazard models

EQ parameters

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:	4.5M
Depth:	35 Km
Lat/Lon:	38.2886 , 142.1671
Event Date:	16 Apr 2021 11:51 UTC 16 Apr 2021 20:51 Local
Exposed Population:	480000 people within 100km
Source:	NEIC us6000e21g
Inserted at:	16 Apr 2021 14:02 UTC
INFORM Coping capacity of the alert score	1.5 (Japan)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake		GDACS score
NEIC	0		0
us6000e21g	Scaled population (vector)	4.86
	C1 earthquake	0.73
	C2 earthquake	-0.22
	Country Vulnerability	-0.71
	INFORM_normalised	0.57

Maximum expected impact using different data sources.

Episode Timeline

ID	Alert	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1370431		0	16 Apr 2021 11:51	4.5M, 35km	N/A	490 thousand (in 100km)		02:11	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 9,984,608) . The nearest places are Niiyama, Oshika, Tomari, Yoriiso, Ayukawahama, Terama, Futawatashi, Kukunari, Izushima, Yagawa, and Kotake.

Radius	Population
100 km	490000 people
75 km	58000 people
50 km	no people
20 km	no people
10 km	no people
5 km	no people
2 km	no people

Affected Provinces

Region Province	Country	Population
Tohoku	Japan	10 million people
Kanto	Japan	38.5 million people
Chubu	Japan	5.2 million people
Hokkaido	Japan	5.8 million people

Affected populated places

Name	Region Province	Country	City class	Population	Distance
Niiyama	Miyagi	Japan	Village	-	56 km
Oshika	Miyagi	Japan	Village	-	57 km
Tomari	Miyagi	Japan	Village	-	57 km
Yoriiso	Miyagi	Japan	Village	-	57 km
Ayukawahama	Miyagi	Japan	Village	-	58 km
Terama	Miyagi	Japan	Village	-	58 km
Futawatashi	Miyagi	Japan	Village	-	59 km
Kukunari	Miyagi	Japan	Village	-	59 km
Izushima	Miyagi	Japan	Village	-	60 km
Yagawa	Miyagi	Japan	Village	-	60 km
Samenoura	Miyagi	Japan	Village	-	60 km
Osu	Miyagi	Japan	Village	-	61 km
Kumazawa	Miyagi	Japan	Village	-	61 km
Oharahama	Miyagi	Japan	Village	-	61 km
Kuwahama	Miyagi	Japan	Village	-	61 km
Aji	Miyagi	Japan	Village	-	61 km
Kobuchi	Miyagi	Japan	Village	-	61 km
Tatsuhama	Miyagi	Japan	Village	-	62 km
Ikenohama	Miyagi	Japan	Village	-	62 km
Koamikura	Miyagi	Japan	Village	-	62 km
Ohama	Miyagi	Japan	Village	-	63 km
Funagoshi	Miyagi	Japan	Village	-	63 km
Fukkiura	Miyagi	Japan	Village	-	64 km
Ommaehama	Miyagi	Japan	Village	-	64 km
Takenohama	Miyagi	Japan	Village	-	65 km
Ogatsu	Miyagi	Japan	Village	-	65 km
Odomari	Miyagi	Japan	Village	-	65 km
Onagawahama	Miyagi	Japan	Village	-	66 km
Kitsunezaki	Miyagi	Japan	Village	-	66 km
Nitoda	Miyagi	Japan	Village	-	66 km
Ozashi	Miyagi	Japan	Village	-	67 km
Kodaki	Miyagi	Japan	Village	-	67 km
Aikawa	Miyagi	Japan	Village	-	68 km
Terahama	Miyagi	Japan	Village	-	69 km
Tsukihama	Miyagi	Japan	Village	-	69 km
Kotake	Miyagi	Japan	Village	-	70 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	84 km

Ports

Name	LOCODE	Country	Distance
Onagawa	JPONG	Japan	65 km
Ishinomaki	JPISM	Japan	76 km
Kesennuma Ko		Japan	81 km
Ofunato	JPOFT	Japan	94 km
Shiogama	JPSGM	Japan	99 km

Nuclear plants

Name	Country	Reactors	Distance
ONAGAWA	JAPAN	3	60 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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