Reviewed by USGSTurkey93y ago
M6.3 earthquake 9 km WNW of Marmara, Turkey
Friday, January 4, 1935, 14:41:30 UTC · 40.620°N, 27.451°E
A magnitude 6.3 earthquake struck 9 km WNW of Marmara, Turkey on Friday, January 4, 1935, 14:41:30 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M7.1 on April 18, 1928.
- Magnitude
- 6.3
- Strong · mw
- Depth
- 15 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- VII
- Very strong (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 100 km aftershock search areaColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
49 kilotons of TNT
That is about 3 times the Hiroshima bomb. It released about 102 times the energy of a magnitude 5.0.
Tectonic setting
7 km
from the nearest mapped plate boundary, between the Anatolian and Eurasian plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
15 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 100 km
USGS lists 1 M2.5+ earthquake within 100 km in the following 30 days; the largest was M6.0 on January 4, 1935. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 37 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.2Aegean SeaNovember 8, 1905 · 246 km W of this epicenter
- 7.225 km SE of Malkara, TurkeyAugust 9, 1912 · 30 km NW of this epicenter
- 7.19 km S of Stara Zagora, BulgariaApril 14, 1928 · 244 km NW of this epicenter
- 7.13 km W of Brezovo, BulgariaApril 18, 1928 · 278 km NW of this epicenter
- 7.03 km ESE of Soma, TurkeyNovember 18, 1919 · 161 km S of this epicenter
- 6.730 km SW of Kumbağ, TurkeySeptember 13, 1912 · 22 km W of this epicenter
- 6.4TurkeyMarch 31, 1928 · 261 km S of this epicenter
- 6.223 km SE of Yenice, TurkeyMay 2, 1928 · 180 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 53 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 44,733 recorded deaths. The most severe:
- 1883M7.3
Ayvalik, Izmir, Cesme
15 Oct 1883 · 279 km away · intensity X
15,000 deathsExtreme damage ($25M+)
- 1881M7.3
Khios; Turkey: Cesme
3 Apr 1881 · 283 km away · intensity XI
7,866 deathsExtreme damage ($25M+)tsunami
- 1719
Turkey
25 May 1719 · 165 km away · intensity X
6,000 deathsExtreme damage ($25M+)
- 1766M6.5
Turkey
22 May 1766 · 132 km away · intensity X
4,000 deathsExtreme damage ($25M+)tsunami
- 1912M7.2
Marmara Sea
9 Aug 1912 · 30 km away
2,800 deathsExtreme damage ($25M+)tsunami
- 1855M6.7
Tayabas, Bursa
28 Feb 1855 · 147 km away · intensity X
2,200 deathsSevere damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.