Earthquakes near Bolu through history

The one on August 17, 1999 was the deadliest: NOAA records 17,118 deaths for it. NOAA’s list of significant earthquakes has 12 here, back to AD 120. NOAA records deaths in 10 of the events here, 25,567 in all. The latest on NOAA’s list is a magnitude 6.1 on November 23, 2022 (15 km W of Düzce, Turkey). NOAA’s record here begins in AD 120 with an earthquake (Nicomedia, Nicaea). It grows thinner going back: 9 of the 12 significant earthquakes NOAA lists here are from 1927 on.

• November 23, 2022Earthquake · M 6.115 km W of Düzce, Turkey · 2 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• August 17, 1999Earthquake · M 7.64 km ESE of Derince, Turkey · 17,118 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• February 1, 1944Earthquake · M 7.610 km WNW of Orta, Turkey · 2,381 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• AD 120Earthquake · M 7.2 (est.)Nicomedia, NicaeaNOAA NCEI

• An event counts for Bolu 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