M3.5 earthquake 31 km NNW of Biga, Turkey
A magnitude 3.5 earthquake struck 31 km NNW of Biga, Turkey on Wed, Oct 20, 1999, 2:20 AM GMT+3 (23:20 UTC), 11 km (7 mi) below the surface.
A larger quake followed: M3.9 13 km NNE of Marmara, Turkey. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.5 (Md, duration), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1999-10-19 23:20:18 UTC
- Depth
- 11.4 km (7.1 mi), shallow
- Epicenter
- 40.501° N, 27.124° E
- Region
- Turkey
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 8 in the 30 days before it.
After
- 3.017 km SSE of Kumba?, Turkey · 9839 days ago · 5 km deep · 46 km away
- 2.814 km SSE of Kumba?, Turkey · 9834 days ago · 4 km deep · 45 km away
- 2.812 km S of Kumba?, Turkey · 9808 days ago · 0 km deep · 40 km away
- 3.913 km NNE of Marmara, Turkey · 9801 days ago · 10 km deep · 46 km away
Before
- 2.78 km SW of Manyas, Turkey · 9851 days ago · 0 km deep · 86 km away
- 2.811 km ESE of Kumba?, Turkey · 9855 days ago · 6 km deep · 52 km away
- 3.2Aegean Sea · 9867 days ago · 17 km deep · 98 km away
- 3.318 km SE of Kumba?, Turkey · 9874 days ago · 19 km deep · 52 km away
- 2.8Western Turkey · 9874 days ago · 9 km deep · 49 km away
- 3.214 km NNE of Marmara, Turkey · 9874 days ago · 6 km deep · 46 km away
- 3.713 km NNE of Marmara, Turkey · 9875 days ago · 8 km deep · 46 km away
- 4.87 km NNE of Marmara, Turkey · 9875 days ago · 10 km deep · 42 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0009g90. Read Sat, Oct 3, 2026, 9:43 AM UTC.