EveryQuake

Earthquakes in Nagano Prefecture

1,097 earthquakes catalogued in and around Nagano Prefecture between 1905 and 2026. Recorded measurements; not a forecast.

Last updated 4 August 2026 · merged from 5 catalogues
3.2
Latest earthquake · depth 10 km
31.07.2026 23:38 UTC · from centre 60 km
1,097
recorded earthquakes
M7.9
largest
1905–2026
record span
4.41
mean magnitude
572
epicentre inside the border

By year

Stacked by magnitude; one column per year.

047941905: 1 (M5+)19051906: 2 (M5+)1909: 1 (M5+)19151916: 1 (M5+)1918: 1 (M5+)1921: 1 (M5+)1922: 1 (M5+)1923: 7 (M5+)1924: 1 (M5+)19251927: 1 (M5+)1929: 1 (M5+)1930: 2 (M5+)1931: 6 (M5+)1933: 2 (M5+)1934: 4 (M5+)1935: 2 (M5+)19351938: 1 (M5+)1941: 1 (M5+)1942: 1 (M5+)1943: 1 (M5+)1944: 1 (M5+)1945: 2 (M5+)19451948: 1 (M5+)1949: 2 (M5+)1952: 1 (M5+)19551959: 1 (M5+)1961: 1 (M4–5)1961: 1 (M5+)1962: 3 (M4–5)1963: 2 (M4–5)1963: 1 (M5+)1965: 1 (M3–4)1965: 9 (M4–5)1965: 2 (M5+)19651966: 90 (M4–5)1966: 4 (M5+)1967: 36 (M4–5)1968: 15 (M4–5)1968: 4 (M5+)1969: 21 (M4–5)1969: 1 (M5+)1970: 5 (M4–5)1970: 2 (M5+)1971: 7 (M4–5)1971: 3 (M5+)1972: 3 (M4–5)1972: 1 (M5+)1973: 1 (M3–4)1973: 6 (M4–5)1974: 1 (M3–4)1974: 2 (M4–5)1974: 2 (M5+)1975: 3 (M4–5)19751976: 2 (M3–4)1976: 13 (M4–5)1976: 5 (M5+)1977: 1 (M3–4)1977: 5 (M4–5)1977: 1 (M5+)1978: 1 (M3–4)1978: 4 (M4–5)1978: 6 (M5+)1979: 1 (M3–4)1979: 5 (M4–5)1979: 1 (M5+)1980: 2 (M4–5)1980: 1 (M5+)1981: 1 (M3–4)1981: 7 (M4–5)1981: 2 (M5+)1982: 4 (M4–5)1983: 9 (M4–5)1983: 3 (M5+)1984: 23 (M4–5)1984: 5 (M5+)1985: 5 (M4–5)19851986: 10 (M4–5)1986: 2 (M5+)1987: 1 (M3–4)1987: 7 (M4–5)1987: 2 (M5+)1988: 1 (M3–4)1988: 6 (M4–5)1988: 1 (M5+)1989: 1 (M<3)1989: 1 (M3–4)1989: 2 (M4–5)1989: 2 (M5+)1990: 1 (M3–4)1990: 21 (M4–5)1990: 8 (M5+)1991: 12 (M4–5)1991: 1 (M5+)1992: 5 (M4–5)1993: 1 (M3–4)1993: 14 (M4–5)1993: 1 (M5+)1994: 3 (M3–4)1994: 8 (M4–5)1994: 2 (M5+)1995: 2 (M3–4)1995: 12 (M4–5)19951996: 5 (M3–4)1996: 10 (M4–5)1996: 1 (M5+)1997: 1 (M3–4)1997: 5 (M4–5)1997: 4 (M5+)1998: 2 (M3–4)1998: 16 (M4–5)1998: 5 (M5+)1999: 3 (M3–4)1999: 4 (M4–5)2000: 1 (M3–4)2000: 6 (M4–5)2001: 1 (M3–4)2001: 12 (M4–5)2001: 3 (M5+)2002: 5 (M3–4)2002: 6 (M4–5)2003: 3 (M<3)2003: 1 (M3–4)2003: 5 (M4–5)2004: 3 (M<3)2004: 3 (M3–4)2004: 34 (M4–5)2004: 20 (M5+)2005: 1 (M<3)2005: 2 (M3–4)2005: 22 (M4–5)20052006: 1 (M<3)2006: 4 (M3–4)2006: 10 (M4–5)2006: 1 (M5+)2007: 7 (M3–4)2007: 7 (M4–5)2007: 6 (M5+)2008: 7 (M3–4)2008: 9 (M4–5)2009: 3 (M4–5)2009: 2 (M5+)2010: 4 (M4–5)2010: 1 (M5+)2011: 1 (M3–4)2011: 38 (M4–5)2011: 11 (M5+)2012: 7 (M4–5)2012: 2 (M5+)2013: 7 (M4–5)2013: 1 (M5+)2014: 2 (M3–4)2014: 17 (M4–5)2014: 2 (M5+)2015: 10 (M4–5)20152016: 9 (M4–5)2017: 6 (M4–5)2017: 2 (M5+)2018: 1 (M3–4)2018: 3 (M4–5)2018: 2 (M5+)2019: 1 (M3–4)2019: 4 (M4–5)2020: 24 (M3–4)2020: 28 (M4–5)2020: 6 (M5+)2021: 7 (M3–4)2021: 15 (M4–5)2021: 1 (M5+)2022: 3 (M3–4)2022: 8 (M4–5)2022: 2 (M5+)2023: 5 (M3–4)2023: 4 (M4–5)2023: 3 (M5+)2024: 9 (M3–4)2024: 7 (M4–5)2024: 18 (M5+)2025: 19 (M3–4)2025: 12 (M4–5)20252026: 30 (M3–4)2026: 15 (M4–5)2026: 2 (M5+)
M<3M3–4M4–5M5+

Read this chart carefully. Rising columns do not mean earthquakes are becoming more frequent. The monitoring network improved over time: the smallest detectable earthquake in Türkiye was about M5.0 in 1966 and is M1.5 today. Earlier years look quiet because small events were not heard, not because they did not happen.

Largest earthquakes

Inclusion rule: the radius widens with magnitude (15 km up to M4, 150 km at M7 and above). This is not a measure of felt shaking or intensity.

MagnitudeDateDepthDistance
7.901.09.1923 02:5815 km138 km
7.602.09.1923 02:4615 km210 km
7.501.01.2024 07:109.7 km166 km
7.421.01.1906 13:49300 km215 km
7.301.09.1923 03:0335 km174 km
7.224.10.1905 03:46250 km250 km
7.014.08.1909 06:3135 km194 km
7.028.06.1948 07:1310 km162 km
7.019.08.1961 05:3315 km118 km
6.925.11.1930 19:0215 km154 km
6.814.01.1924 20:5015 km126 km
6.712.01.1945 18:3810 km187 km
6.725.03.2007 00:417.4 km183 km
6.714.01.1978 03:2410.3 km183 km
6.616.07.2007 01:1315.1 km161 km

Latest earthquakes

MagnitudeDateDepthDistance
3.231.07.2026 23:3810 km60 km
3.221.07.2026 20:450 km33 km
3.221.07.2026 15:4740 km115 km
3.021.07.2026 15:4240 km119 km
5.326.06.2026 13:2821.8 km106 km
4.519.06.2026 18:16216.2 km78 km
3.214.06.2026 08:3910 km65 km
4.006.06.2026 01:2040 km143 km
3.505.06.2026 14:3010 km13 km
3.103.06.2026 23:5010 km13 km
3.503.06.2026 15:09196.6 km72 km
3.127.05.2026 07:1010 km56 km
3.526.05.2026 06:4510 km68 km
4.023.05.2026 22:0610 km68 km
3.523.05.2026 19:1510 km68 km
4.619.05.2026 23:11261.6 km93 km
3.515.05.2026 22:2710 km57 km
3.308.05.2026 16:01228.6 km36 km
4.108.05.2026 03:3610 km124 km
3.002.05.2026 06:290 km46 km
3.429.04.2026 07:4510 km56 km
3.226.04.2026 22:4510 km56 km
4.122.04.2026 17:4210 km56 km
3.121.04.2026 15:2910 km56 km
3.018.04.2026 08:4710 km46 km
3.618.04.2026 07:2110 km56 km
3.218.04.2026 06:3310 km56 km
4.918.04.2026 05:5410 km66 km
4.918.04.2026 04:2010 km55 km
3.017.04.2026 12:300 km50 km
3.314.04.2026 07:520 km44 km
4.014.04.2026 06:340 km44 km
3.207.04.2026 10:5210 km11 km
3.329.03.2026 06:5610 km76 km
3.424.03.2026 13:110 km50 km
4.212.03.2026 19:250.9 km51 km
3.312.03.2026 19:070 km50 km
3.412.03.2026 11:3310 km50 km
4.823.02.2026 23:03258 km136 km
4.107.02.2026 11:0120 km104 km
3.506.02.2026 00:2310 km94 km
3.325.01.2026 06:430 km44 km
3.717.01.2026 18:4610 km57 km
4.015.01.2026 05:571.8 km47 km
5.215.01.2026 05:4810 km29 km
4.315.01.2026 05:430 km50 km
4.915.01.2026 05:4010 km39 km
3.025.12.2025 02:5210 km22 km
3.703.12.2025 00:39117.7 km110 km
3.130.11.2025 11:2510 km39 km
4.215.11.2025 18:50260.8 km89 km
3.013.11.2025 08:4710 km39 km
3.512.11.2025 06:5040 km125 km
3.413.10.2025 17:3310 km73 km
3.307.10.2025 06:07262.1 km52 km
3.028.09.2025 01:4260 km87 km
3.021.09.2025 02:3210 km22 km
3.008.09.2025 10:2410 km65 km
4.307.09.2025 23:24132.8 km65 km
4.107.09.2025 01:5140 km139 km

Method and sources

What this page counts
An earthquake appears here when its epicentre is within a magnitude-dependent distance of this place's border: 15 km up to M4, 30 km to M5, 60 km to M6, 100 km to M7, and 150 km at M7 and above. The rule exists because a large earthquake concerns neighbouring provinces too — the 17 August 1999 epicentre was in the Gulf of İzmit, on no province's land at all.
Location precision
Epicentre uncertainty is typically 1–10 km, and larger for older records. That is why this site breaks data down to districts but not to neighbourhoods or villages — the data does not support that distinction.
Magnitude scales
The catalogues use more than twelve magnitude scales (Mw, ML, mb, Md…) and they are not equivalent. Values are shown on the scale the source reported; they are not converted.
Deduplication
The same earthquake is published by several catalogues. Records within 20 seconds and 100 km whose magnitudes differ by no more than 1.2 are treated as one event; the primary record is chosen by catalogue priority.
Updates
Recent earthquakes are fetched from four sources every five minutes. The historical archive is rebuilt infrequently.
Sources
USGS ComCat · ISC Bulletin · AFAD · Kandilli / KOERI · EMSC/CSEM
Reporting an error
If you spot a wrong record, write to us; we verify against the source and correct it.