Earthquakes near Salamanca through history

The strongest was an estimated magnitude 7.5 on June 19, 1858 (Mexico City). The latest on NOAA’s list is a magnitude 4.8 on July 14, 1934 (Guanajuato, Queretaro). NOAA’s record here begins on June 19, 1858 with an earthquake (Mexico City). NOAA lists one significant eruption of one volcano within 100 km of Salamanca. The largest was Michoacan-Guanajuato on February 20, 1943, at 4 on the volcanic explosivity index. It killed 103 people by NOAA’s count.

• February 20, 1943Eruption · VEI 4Michoacan-Guanajuato · 103 deaths (NOAA)NOAA NCEI · Wikipedia
• July 14, 1934Earthquake · M 4.8Guanajuato, QueretaroNOAA NCEI
• September 19, 1912Earthquake · M 7.0Acambay-TixmadejeNOAA NCEI
• June 19, 1858Earthquake · M 7.5 (est.)Mexico CityNOAA NCEI

• An event counts for Salamanca 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