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Earthquake sequence in Turkey, February 6th 2023
Last update: 28 February 2023 at 10:31 UTC
Earthquake details | Aftershocks locations
Send us pictures or videos | Epicenter location
Earthquake details
Nine hours after a first earthquake of magnitude M7.8 that hits south-eastern Turkey, near the Syrian border, February 6th 2023 at 1h17 UTC, a second M7.5 occurs (at 10h24 UTC) 100km further north. Two weeks after, another earthquake of magnitude 6.3 hits the region. More information on the main shock (M7.8) is available [here], for the 7.5 [here] and for the M6.3 [here].
These earthquakes has been largely felt up to 2000 km fom the epicenter, mainly in Turkey, Syria, Lebanon, Cyprus, ...
At the time of the report, a lot of buildings are damaged and more than 40000 peoples haven been killed in Turkey and Syria.
Additional information can found:
- Priliminary report from KOERI on "Strong Ground Motion and Building Damage Estimations" [link]
- Priliminary report from KOERU and INGV on the "Large historical earthquakes of the earthquake-affected region" [link]
- Multiple-point seismic source models of the catastrophic Turkish earthquakes of February 6, 2023 from Jiří Zahradník, Fatih Turhan, Efthimios Sokos [link]
- "Environmental Disasters & Crises Management Strategies" of the National & Kapodistrian University of Athens [link]
Preliminary Information for the M6.3 February 20th at 17:04 UTC
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Preliminary Estimation of Intensity Distribution from KOERI for the Hatay Türkiye M6.3 Earthquake 20 Feb 2023 (20:04 GMT+03:00).
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Co-seismic motion of the micro-plates (Anatolia and Arabia)
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Contributors: The co-seismic motion of the micro-plates (Anatolia and Arabia) was captured by the continuous GNSS network of Türkiye (TUSAGA-Aktif: CORS-TR Turkish National Permanent GNSS Network–Active). The geodetic data comprise 30-s GPS observations of the days prior to the 6 February 2023 event and the day of the Mw7.8 earthquake. The earthquake epicentre is indicated by the yellow star and the aftershock sequence (relocated with HypoDD) by the red dots. Data were processed by Gipsy X using the JPL rapid high-rate orbits. The co-seismic offsets were estimated from 1-hour prior and 1-hour post-event measurements. The offsets are shown by the motion vectors on the map with arrow-head ellipses indicating 67% confidence interval. The results document a permanent, left-lateral motion of 70 cm between stations ANTE (Gaziantep) and ONIY (Osmaniye) and 80 cm between stations ANTE and EKZ1 (Ekinözü). The deformation decreases towards east and west while cm-size offsets were detected as far as lake Van (500 km towards ENE from the epicentre). The table of co-seismic offsets is accessible [here]. The contributors thank the CORS-TR (TUSAGA-Aktif-Türkiye) administrated by General Directorate of Land Registry and Cadastre (TKGM) and General Directorate of Mapping (HGM) for releasing GNSS data. |
Tide gauge observations
| In addition to the seismic activity, a triggered 10 cm wave has been recorded 2h27 after the mainshock on a tide gauge 266 km away from the epicenter. The figure on the right shows the frequency content (top), the raw water level signal (middle) and the signal corrected from the day/night tide (bottom). |  |
Aftershocks locations
Three days after the mainshock, the EMSC has colllected more than 970 earthquakes (with a mag > 2.5). This sequence contains two major events, one M7.8 (the mainshock) and one M7.5. It's interresting to note that their spatial distribution can be splitted along two lines and can be interpreted by the rupture of two adjacent faults (see figure below).
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(left) Spatial and time distribution of eathquakes after the M7.8 (inspired from Mazet-Roux (CEA)). Data from AFAD between February the 6th and February the 21 8:00 AM (UTC). 7915 aftershocks have bee recorded since the M7.8 mainshock. (down) Event locations from double-difference.
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| Location of the earthquake sequence after the mainshock. This sequence can be spliited in two subset associated with the rupture of two faults centered respectively on the M 7.8 and the M 7.5. See the two figures below. |
Magnitude distribution in time of seismic events within 300 km of the mainshock. |
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| Spatial distribution of aftershocks between the first M7.8 and the M7.5. | Spatial distribution of aftershocks after M7.5. |
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Maps of felt reports
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Maps of feltreports collected for the mainshock M7.8 (top left), for the second shock M7.5 (top right) and for the M6.3 (bottom left). |
If you have experienced this earthquake, you are invited to answer the online questionnaire. Your testimony will be useful to update the Intensity map here below, where intensities correspond to the effects of the earthquake.
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Epicenter location
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| Main Shock Epicenter Location | Past Regional Seismicity as from the ISC catalogue (1964-2004) and EMSC Real Time catalogue (2005-today) | Tensors Solutions |