2026-04-29 16:45 (UTC+9), NORTHERN NAGANO, 10km Depth, M 3.4 by JMA

Is Distribution Maximum Observed Is:3

Seismic Intensity (Is) distribution is estimated from the observed data (circles) of NIED K-NET, KiK-net, JMA, and local governments that had been collected by 2026/04/29 16:50:09.

Estimated Is for Major Cities

Max. Obs. Is Histogram
of Estimated Is
1
2
3
4
5-
5+
6-
6+
7
 Municipality Show All Data Daytime Population Distance
[km]
3
Ogawa,Kamiminochi,Nagano 2,300 6
3
Omachi,Nagano 29,000 11
The histogram shows frequency distribution of estimated Is derived from interpolation of the observation with 250-m mesh. The daytime and nighttime correspond to 9:00-18:59 and 19:00-8:59, respectively. The distance is measured from the epicenter to the center of the municipality.

Is Exposed-Population Estimates of Each City

5- or greater
5- or greater
Not Available
5+ or greater
5+ or greater
Not Available
6- or greater
6- or greater
Not Available
6+ or greater
6+ or greater
Not Available
color scale

Population exposed to Is 5- or greater are not estimated.

Major Historical Damaging Earthquakes in This Region

Year Region M Damage
1933 Off Noto Peninsula 6.0 3 dead, 2 houses collapsed and 143 damaged. 2 injured in Toyama.
1941 Northern Nagano 6.1 5 dead, 29 houses collapsed, 115 partially destroyed, 48 non-residential houses collapsed.
1943 Northern Nagano 5.9 1 dead, 14 houses collapsed, 66 partially destroyed, 20 non-residential houses collapsed.
1965 Northern Nagano 5.4 Matsushiro Gunpatsu Earthquake,62,821 felt earthquakes until the late 1970s. There were 9 5-Is earthquakes, and 50 were 4-Is. Earthquakes causing damage led to 51. 15 injuries, 10 houses collapses, 4 partially destroyed houses, 60 landslides.
1969 Western And Central Mino, Gifu 6.6 1 dead, 10 injured, 86 houses damaged.
1984 Southern Nagano 6.8 Naganoken Seibu Earthquake,29 dead, 10 injured. 14 house outflows or collapses, 73 partially destroyed, 565 damaged. 258 roads damaged.
2011 Border Between Nagano, Niigata 6.7 57 injured, 73 houses collapsed, 427 partially destroyed (Nagano and Niigata; not including related death.). The maximum Is was 6+ in Sakae Village in Nagano. An Is of 6- was observed in Niigata.
2011 Central Nagano 5.4 1 dead, 17 injured, 24 houses partially destroyed (Nagano). The maximum Is was 5+ (Matsumoto city in Nagano).
2014 Northern Nagano 6.7 The crustal earthquake with reverse faults, considered to have occurred in the northern part of Itoigawa-Shizuoka-kozosen fault zone. 77 houses collapsed and 137 partially destroyed (as of Jan. 5, 2015). The maximum Is was 6-.
Reference: National Astronomical Observatory of Japan, Chronological Scientific Tables, Maruzen, (2017) *partially extracted

Seismic Hazard Information of J-SHIS

J-SHIS is a Web service by NIED, to help prevent and prepare for earthquake disaster by providing a public portal for seismic hazard information across Japan.

Is Distribution of 2% Probability of Exceedance in 50 Years
SI Distribution of 2% Probability of Exceedance in 50 Years SI color scale
Is Distribution of Return Period of 50,000-year
Is Distribution of Return Period of 50,000-year Is color scale