M 4.9 in Japan on 04 Aug 2020 11:21 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: 4.9M
Depth: 78.76 Km
Lat/Lon: 34.4361 , 140.2874
Event Date: 04 Aug 2020 11:21 UTC
04 Aug 2020 20:21 Local
Exposed Population:
270000 people within 100km
Source: NEIC us6000b94h
Inserted at: 04 Aug 2020 11:47 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
us6000b94h Scaled population (vector) 4.76  
  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

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1324852 0 04 Aug 2020 11:21 4.9M, 78.76km N/A 280 thousand (in 100km) 00:26 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 Kanto (population 38,543,000) . The nearest places are Shiramazu, Hara, Okawa, Chikura, Hongo, Nemoto, Kanamaru, Funagasaku, Shirako, Seto, and Fugiwara.

Radius Population
100 km 280000 people
75 km 74000 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
Kanto Japan 38.5 million people
Chubu Japan 5.2 million people
Tohoku Japan 10 million people
Kinki Japan 22.2 million people

Affected populated places

Name Region Province Country City class Population Distance
Shiramazu Chiba Japan Village - 63 km
Hara Chiba Japan Village - 63 km
Okawa Chiba Japan Village - 63 km
Chikura Chiba Japan City - 65 km
Hongo Chiba Japan Village - 65 km
Nemoto Chiba Japan Village - 66 km
Kanamaru Chiba Japan Village - 67 km
Funagasaku Chiba Japan Village - 67 km
Shirako Chiba Japan Village - 68 km
Seto Chiba Japan Village - 68 km
Komatsu Chiba Japan Village - 68 km
Kubo Chiba Japan Village - 69 km
Fugiwara Chiba 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
Tateyama 3 0 74 km
Miyake Jima MYE 20 Civ. Paved Yes 3900 78 km
Oshima OIM 40 Civ. Paved Yes 3900 93 km
29 0 94 km

Ports

Name LOCODE Country Distance
Tateyama JPTTY Japan 73 km
Katsuura Ko Japan 78 km
Miyake Japan 85 km
Mikura Japan 91 km
Oshima JPOSM Japan 92 km
Nii Japan 95 km

Dams

Reservoir Dam Name River Year Distance
Sakuma Sakuma Okuzuregawa 1990 84 km
Kameyamako Kameyama Obitsugawa 1980 90 km

More information

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