Earthquakes near Kashan through history

The deadliest was not the strongest: an earthquake on June 7, 1755 (N: Tabriz,Kashan), for which NOAA records 40,000 deaths. NOAA’s list of significant earthquakes has 12 here, back to 401 BCE. NOAA records deaths in 7 of the events here, 78,229 in all. The latest on NOAA’s list is a magnitude 5.5 on June 18, 2007 (Qom). NOAA’s record here begins in 401 BCE with an earthquake (Rey,Eivan-E-Kay).

• June 18, 2007Earthquake · M 5.5QomNOAA NCEI
• January 23, 1909Earthquake · M 7.343 km NW of Delījān, Iran · 5,500 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• June 7, 1755EarthquakeN: Tabriz,Kashan · 40,000 deaths (NOAA)NOAA NCEI
• 401 BCEEarthquake · M 7.6 (est.)Rey,Eivan-E-KayNOAA NCEI

• An event counts for Kashan when it began within 100 km of its centre, or 200 km for an earthquake of magnitude 7 or more. Damage can reach further.
• USGS counts here start at magnitude 6: the catalogue’s smaller quakes thin out going back, where few instruments listened.
• NOAA lists significant events only: earthquakes that killed, did about $1 million of damage, reached magnitude 7.5 or intensity X, or raised a tsunami, and eruptions and tsunamis by like measures. Magnitudes before 1900 are its estimates from written accounts.
• Deaths are NOAA’s total for each event, wherever people died, its tsunami and fires included. A tsunami counts the dead its runup records give for this place: NOAA’s total for a tsunami includes its source quake’s.
• A tsunami from elsewhere counts where one of its runups killed or rose a metre or more.
• Counted to October 19, 2026, as is the map. The last 30 days ask USGS again.

How the layers work, where their data comes from and what they can’t tell you: Earthquakes, live, The world through history