M 4.8 in Japan on 20 Sep 2020 10:48 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: 4.8M
Depth: 70.9 Km
Lat/Lon: 34.9812 , 140.317
Event Date: 20 Sep 2020 10:48 UTC
20 Sep 2020 19:48 Local
Exposed Population:
18890000 people within 100km
Source: NEIC us7000bqgi
Inserted at: 20 Sep 2020 11:06 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
us7000bqgi Scaled population (vector) 6.54  
  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
1333706 0 20 Sep 2020 10:48 4.8M, 70.9km N/A 18.9 million (in 100km) 00:18 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 Katsuura, Kamogawa, Wada, Ohara, Shirako, Chikura, Kubo, Seto, Fujioayashi, Okawa, and Tokyo.

Radius Population
100 km 18.9 million people
75 km 2.3 million people
50 km 360000 people
20 km 14000 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

Affected populated places

Name Region Province Country City class Population Distance
Katsuura Chiba Japan Village 22000 people 19 km
Kamogawa Chiba Japan Village 29000 people 23 km
Wada Chiba Japan Village - 27 km
Ohara Chiba Japan City 20000 people 30 km
Shirako Chiba Japan Village - 32 km
Chikura Chiba Japan City - 32 km
Kubo Chiba Japan Village - 33 km
Seto Chiba Japan Village - 33 km
Fujioayashi Chiba Japan Village - 34 km
Okawa Chiba Japan Village - 34 km
Shiramazu Chiba Japan Village - 35 km
Kobata Chiba Japan Village - 36 km
Komatsu Chiba Japan Village - 37 km
Hara Chiba Japan Village - 38 km
Funagasaku Chiba Japan Village - 39 km
Kokubu Chiba Japan Village - 39 km
Olo Chiba Japan Village - 40 km
Kururi Chiba Japan Village - 41 km
Kanamaru Chiba Japan Village - 41 km
Hongo Chiba Japan Village - 41 km
Tateyama Chiba Japan City 49000 people 42 km
Ichinomiya Chiba Japan Village - 43 km
Nemoto Chiba Japan Village - 44 km
Fugiwara Chiba Japan Village - 44 km
Katsuyama Chiba Japan Village - 44 km
Ko Chiba Japan Village - 45 km
Chonan Chiba Japan Village - 46 km
Minato Chiba Japan Village - 47 km
Kembutsu Chiba Japan Village - 47 km
Konuma Chiba Japan Village - 48 km
Ushiku Chiba Japan Village - 49 km
Mobara Chiba Japan City 96000 people 49 km
Sunosaki Chiba Japan Village - 51 km
Kisarazu Chiba Japan City 120000 people 57 km
Kimitsu Chiba Japan Village 92000 people 57 km
Futtso Chiba Japan Village - 58 km
Oami Chiba Japan Village - 60 km
Anegasaki Chiba Japan Village - 60 km
Katakai Chiba Japan City - 61 km
Togane Chiba Japan Village 55000 people 64 km
Goi Chiba Japan Village - 64 km
Yokosuka Kanagawa Japan City 420000 people 66 km
Misaki Kanagawa Japan Village - 66 km
Hasunuma Chiba Japan Village - 70 km
Naruto Chiba Japan City 22000 people 70 km
Chiba Chiba Japan Major city 920000 people 71 km
Kawasaki Kanagawa Japan Major city 1.3 million people 83 km
Yokohama Kanagawa Japan Major city 3.6 million people 83 km
Tokyo Tokyo Japan Capital 8.1 million people 88 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 44 km
Kisarazu 3 Mil. Paved Yes 6000 59 km
Shimoshizu 30 0 76 km
Tokyo Haneda International HND 7 Civ. Paved Yes 9800 80 km
Yokohama YOK unknown 0 82 km
Tokyo Narita International NRT 42 Civ. Paved Yes 13100 87 km
Oshima OIM 40 Civ. Paved Yes 3900 90 km
Shimofusa 30 Civ. Paved Yes 7300 95 km
Atsugi NJA 62 Mil. Paved Yes 7900 95 km
Ryugasaki South 2 0 99 km

Ports

Name LOCODE Country Distance
Katsuura Ko Japan 17 km
Tateyama JPTTY Japan 42 km
Kisarazu JPKZU Japan 58 km
Kurihama JPKRH Japan 62 km
Goi JPGOI Japan 64 km
Yokosuka JPYOS Japan 69 km
Chiba JPCHB Japan 71 km
Anegasaki JPANE Japan 72 km
Neghisi JPNGI Japan 78 km
Kawasaki JPKWS Japan 79 km
Yokohama JPYOK Japan 81 km
Katunan Ko Japan 83 km
Ogasawara JPOGA Japan 91 km
Oshima JPOSM Japan 91 km
Tokyo JPTYO Japan 96 km
Choshi JPCHO Japan 96 km

Dams

Reservoir Dam Name River Year Distance
Kameyamako Kameyama Obitsugawa 1980 35 km
Sakuma Sakuma Okuzuregawa 1990 41 km
Takatakiko Takataki Yorogawa 1990 45 km
Kori Kori Korigawa 1972 51 km
Yamakura Yamakura Yamakuragawa 1964 59 km

More information

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