M 4.9 in Japan on 23 Jan 2021 05:39 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: 104.66 Km
Lat/Lon: 42.3492 , 142.6016
Event Date: 23 Jan 2021 05:39 UTC
23 Jan 2021 14:39 Local
Exposed Population:
690000 people within 100km
Source: NEIC us7000d2m3
Inserted at: 23 Jan 2021 05:59 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
us7000d2m3 Scaled population (vector) 5.64  
  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
1354399 0 23 Jan 2021 05:39 4.9M, 104.66km N/A 700 thousand (in 100km) 00:20 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 Hokkaido (population 5,808,054) . The nearest places are Higashi-shizunai, Kami mitsuishi, Ichibu, Utabue, Kerimabu, Sariwarabe, Ogifushi, Shizunai, Niikappu, Urakawa, and Hama-atsuma.

Radius Population
100 km 700000 people
75 km 150000 people
50 km 63000 people
20 km 26000 people
10 km 1400 people
5 km <1000 people
2 km <1000 people

Affected Provinces

Region Province Country Population
Hokkaido Japan 5.8 million people

Affected populated places

Name Region Province Country City class Population Distance
Higashi-shizunai Hokkaido Japan Village - 10 km
Kami mitsuishi Hokkaido Japan Village - 10 km
Ichibu Hokkaido Japan Village - 11 km
Utabue Hokkaido Japan Village - 11 km
Kerimabu Hokkaido Japan Village - 12 km
Sariwarabe Hokkaido Japan Village - 17 km
Ogifushi Hokkaido Japan Village - 18 km
Shizunai Hokkaido Japan Village 22000 people 19 km
Niikappu Hokkaido Japan Village - 24 km
Urakawa Hokkaido Japan Village - 26 km
Nishicha Hokkaido Japan Village - 28 km
Atsugacho Hokkaido Japan Village - 30 km
Showa Hokkaido Japan Village - 31 km
Samani Hokkaido Japan Village - 34 km
Panke Hokkaido Japan Village - 45 km
Mombetsu Hokkaido Japan Village - 46 km
Kurambetsu Hokkaido Japan Village - 47 km
Kami-toyoni Hokkaido Japan Village - 47 km
Furenai Hokkaido Japan Village - 49 km
Sarufuto Hokkaido Japan Village - 49 km
Hobiboe Hokkaido Japan Village - 49 km
Kawamukai Hokkaido Japan Village - 51 km
Biratori Hokkaido Japan Village - 51 km
Moto-sarabetsu Hokkaido Japan Village - 51 km
Oda Hokkaido Japan Village - 53 km
Yachiyo Hokkaido Japan Village - 53 km
Sannakoro Hokkaido Japan Village - 54 km
Ohira Hokkaido Japan Village - 54 km
Rubeshibe Hokkaido Japan Village - 56 km
Toyoni Hokkaido Japan Village - 56 km
Taiki Hokkaido Japan Village - 58 km
Kami-ibise Hokkaido Japan Village - 58 km
Naka-satsunai Hokkaido Japan Village - 58 km
Horoizumi Hokkaido Japan Village - 59 km
Hiroo Hokkaido Japan Village - 59 km
Chiroro Hokkaido Japan Village - 60 km
Hobetsu Hokkaido Japan Village - 60 km
Mukawa Hokkaido Japan Village - 61 km
Kami-notsuka Hokkaido Japan Village - 61 km
Churui Hokkaido Japan Village - 62 km
Onitoppu Hokkaido Japan Village - 64 km
Mikawa Hokkaido Japan Village - 66 km
Chipira Hokkaido Japan Village - 66 km
Taisha Hokkaido Japan Village - 67 km
Memuro Hokkaido Japan Village - 68 km
Naka-hobetsu Hokkaido Japan Village - 68 km
Horonai Hokkaido Japan Village - 68 km
Komahata Hokkaido Japan Village - 68 km
Aiboshima Hokkaido Japan Village - 69 km
Hama-atsuma Hokkaido 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
Obihiro OBO 149 Civ. Paved Yes 8200 66 km
Sado Shima SDS unknown 0 73 km
Tokachi 84 Civ. Paved Yes 4900 76 km
Sapporo-New Chitose CTS 21 Civ. Paved Yes 9800 88 km
Sappora / Chitose 27 Mil. Paved Yes 9800 91 km

Ports

Name LOCODE Country Distance
Samani JPSAM Japan 36 km
Tokachi JPTOK Japan 60 km
Tomakomai JPTMK Japan 86 km
Otsu JPOTU Japan 94 km

Dams

Reservoir Dam Name River Year Distance
Shizunaichoseichi Shizunai Shizunaigawa 1966 8 km
Mitsuishi Mitsuishi Mitsuishigawa 1991 9 km
Takamiko Takami Shizunaigawa 1983 13 km
Higashinosawachoseichi Higashinosawa Koikakushushibicharigawa 1987 20 km
Shimonikappu Shimonikappu Nikappugawa 1969 25 km
Niikappu Niikappu Niikappugawa 1974 29 km
Samaniko Samani Samanigawa 1974 35 km
Poroshiriko Okunikappu Nikappugawa 1963 37 km
Horomanko Horomangawadaisan Horomangawa 1954 46 km
Nibutaniko Nibutani Sarugawa n/a 49 km
Iwachishi Iwachishi Sarugawa 1958 53 km
Azuma Azuma Azumagawa 1969 68 km
Hobetsu Hobetsu Hobetsugawa 1984 69 km
Kawabata Kawabata Yubarigawa 1962 84 km
Shuparoko Oyubari Yubarigawa 1959 86 km
Shimizusawa Shimizusawa Yubarigawa 1954 87 km
Kanayamako Kanayama Sorachigawa 1967 88 km
Kuttariko Kuttari Tokachigawa 1987 92 km
Sahoroko Sahoro Sahorogawa 1984 93 km
Iwamatsuko Iwamatsu Tokachigawa 1943 98 km

More information

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