EveryQuake

Earthquakes in Semnan

1,658 earthquakes catalogued in and around Semnan between 1909 and 2026. Recorded measurements; not a forecast.

Last updated 4 August 2026 · merged from 5 catalogues
4.6
Latest earthquake · depth 10 km
31.07.2026 09:08 UTC · from centre 64 km
1,658
recorded earthquakes
M7.3
largest
1909–2026
record span
3.55
mean magnitude
1,395
epicentre inside the border

By year

Stacked by magnitude; one column per year.

01232471909: 1 (M5+)19091918: 1 (M5+)19181923: 1 (M5+)1927: 6 (M5+)19271928: 1 (M5+)1929: 2 (M5+)1930: 2 (M5+)1932: 1 (M5+)1933: 1 (M5+)1935: 7 (M5+)19361937: 1 (M5+)1939: 2 (M5+)1940: 1 (M5+)19451948: 2 (M5+)1953: 1 (M5+)19541956: 1 (M4–5)1957: 3 (M5+)1958: 1 (M4–5)1961: 1 (M4–5)1962: 3 (M4–5)1963: 1 (M4–5)19631964: 1 (M4–5)1965: 3 (M4–5)1965: 1 (M5+)1967: 2 (M4–5)1968: 2 (M4–5)1969: 1 (M4–5)1970: 1 (M4–5)1970: 2 (M5+)1971: 1 (M4–5)1971: 2 (M5+)1972: 1 (M4–5)19721973: 5 (M4–5)1973: 1 (M5+)1974: 3 (M4–5)1974: 1 (M5+)1975: 2 (M4–5)1976: 1 (M3–4)1976: 6 (M4–5)1977: 2 (M4–5)1977: 2 (M5+)1978: 2 (M4–5)1978: 1 (M5+)1979: 8 (M4–5)1979: 1 (M5+)1980: 2 (M4–5)1980: 1 (M5+)1981: 3 (M4–5)19811982: 5 (M4–5)1983: 3 (M4–5)1983: 2 (M5+)1984: 2 (M4–5)1985: 10 (M4–5)1985: 2 (M5+)1986: 2 (M4–5)1986: 1 (M5+)1987: 4 (M4–5)1987: 1 (M5+)1988: 2 (M3–4)1988: 10 (M4–5)1988: 3 (M5+)1989: 2 (M4–5)1990: 6 (M4–5)1990: 1 (M5+)19901991: 2 (M3–4)1991: 7 (M4–5)1992: 4 (M4–5)1992: 1 (M5+)1993: 8 (M4–5)1994: 5 (M4–5)1995: 3 (M4–5)1996: 3 (M3–4)1996: 6 (M4–5)1996: 2 (M5+)1997: 3 (M3–4)1997: 12 (M4–5)1997: 3 (M5+)1998: 2 (M3–4)1998: 7 (M4–5)1998: 1 (M5+)1999: 2 (M3–4)1999: 4 (M4–5)1999: 2 (M5+)19992000: 3 (M4–5)2001: 2 (M3–4)2001: 4 (M4–5)2002: 1 (M3–4)2002: 6 (M4–5)2002: 2 (M5+)2003: 1 (M<3)2003: 3 (M3–4)2003: 6 (M4–5)2004: 2 (M<3)2004: 13 (M3–4)2004: 18 (M4–5)2004: 3 (M5+)2005: 5 (M<3)2005: 92 (M3–4)2005: 6 (M4–5)2005: 1 (M5+)2006: 33 (M<3)2006: 52 (M3–4)2006: 6 (M4–5)2007: 69 (M<3)2007: 80 (M3–4)2007: 9 (M4–5)2008: 53 (M<3)2008: 45 (M3–4)2008: 5 (M4–5)20082009: 57 (M<3)2009: 54 (M3–4)2009: 5 (M4–5)2010: 13 (M<3)2010: 37 (M3–4)2010: 5 (M4–5)2010: 1 (M5+)2011: 158 (M<3)2011: 84 (M3–4)2011: 5 (M4–5)2012: 22 (M3–4)2012: 15 (M4–5)2013: 23 (M3–4)2013: 9 (M4–5)2014: 28 (M3–4)2014: 11 (M4–5)2015: 20 (M3–4)2015: 7 (M4–5)2016: 23 (M3–4)2016: 10 (M4–5)2017: 21 (M3–4)2017: 7 (M4–5)2017: 1 (M5+)20172018: 23 (M3–4)2018: 7 (M4–5)2019: 18 (M3–4)2019: 10 (M4–5)2020: 28 (M3–4)2020: 8 (M4–5)2020: 2 (M5+)2021: 23 (M3–4)2021: 12 (M4–5)2021: 2 (M5+)2022: 24 (M3–4)2022: 6 (M4–5)2022: 2 (M5+)2023: 28 (M3–4)2023: 10 (M4–5)2024: 14 (M3–4)2024: 8 (M4–5)2025: 43 (M3–4)2025: 12 (M4–5)2025: 4 (M5+)2026: 2 (M3–4)2026: 5 (M4–5)2026
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
7.316.09.1978 15:3517.5 km400 km
7.323.01.1909 02:4815 km404 km
7.205.10.1948 20:1215 km432 km
7.102.07.1957 00:4215 km157 km
7.101.05.1929 15:3710 km391 km
6.730.07.1970 00:5212.4 km250 km
6.612.02.1953 08:1515 km70 km
6.504.02.1997 10:3720.4 km328 km
6.417.09.1923 07:0915 km251 km
6.411.04.1935 23:1415 km105 km
6.328.05.2004 12:3818.9 km261 km
6.322.07.1927 03:5510 km184 km
6.224.03.1918 23:1515 km330 km
6.129.10.1985 13:1315.5 km100 km
6.005.03.1935 10:2635 km117 km

Latest earthquakes

MagnitudeDateDepthDistance
4.631.07.2026 09:0810 km64 km
4.830.07.2026 08:0710 km106 km
4.219.07.2026 05:3810 km158 km
3.925.06.2026 06:280 km276 km
4.016.05.2026 16:4910 km124 km
3.312.05.2026 20:1610 km241 km
4.020.02.2026 08:5310 km167 km
3.809.12.2025 00:520 km151 km
4.103.12.2025 21:5110 km258 km
4.028.11.2025 00:3510 km128 km
4.120.11.2025 20:5610 km238 km
4.205.11.2025 07:180 km199 km
5.020.10.2025 11:550 km105 km
5.002.10.2025 20:3510 km256 km
3.327.09.2025 12:040 km139 km
4.314.09.2025 13:4810 km112 km
4.010.09.2025 16:1512 km100 km
4.921.08.2025 20:3036.4 km261 km
3.404.08.2025 21:090 km117 km
5.319.07.2025 21:3710 km118 km
3.818.07.2025 04:4610 km84 km
3.516.07.2025 18:5010 km246 km
4.715.07.2025 07:140 km104 km
3.427.06.2025 14:1510 km95 km
3.824.06.2025 17:3810 km120 km
5.020.06.2025 17:4910 km137 km
3.320.06.2025 11:5812 km143 km
3.015.06.2025 19:178 km100 km
3.914.06.2025 20:219 km254 km
3.810.06.2025 03:128 km260 km
3.009.06.2025 01:339 km118 km
3.505.06.2025 19:5523 km134 km
3.804.06.2025 13:3810 km123 km
4.202.06.2025 02:2512 km260 km
3.001.06.2025 22:008 km94 km
3.219.05.2025 17:078 km257 km
3.418.05.2025 10:598 km191 km
3.108.05.2025 12:2216 km245 km
4.008.05.2025 09:1512 km254 km
3.208.05.2025 08:0512 km252 km
3.308.05.2025 08:0210 km254 km
3.708.05.2025 07:530 km265 km
3.708.05.2025 05:4510 km255 km
3.008.05.2025 05:4228 km242 km
4.908.05.2025 05:230 km261 km
3.506.05.2025 15:414 km77 km
3.103.05.2025 07:3510 km253 km
3.028.04.2025 06:597 km121 km
3.017.04.2025 16:337 km112 km
3.117.04.2025 07:096 km112 km
3.215.04.2025 11:077 km108 km
3.215.04.2025 01:5710 km211 km
4.010.04.2025 06:000 km107 km
3.128.03.2025 22:328 km117 km
3.528.03.2025 00:2910 km151 km
3.105.03.2025 21:047 km230 km
3.705.03.2025 19:338 km230 km
3.114.02.2025 05:578 km116 km
3.212.02.2025 18:1324 km127 km
3.112.02.2025 17:277 km146 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.