Magnitude 4.1 Quake Strikes Near Lubin Copper Mine NW of Wroclaw, Poland
The earthquake struck at a depth of 5km close to Poland’s Lubin underground copper [and silver mine] about 85km NW of Wroclaw, Poland.
In June 2008, an earthquake measuring 4.7Mw, the largest of a swarm that has hit the mining area since 1990 [see Historic Seismicity below,] occurred at an identical depth of 5km.
10-degree Map Centered at 50°N,20°E

Earthquake location map. Source: USGS
Earthquake Details
- Magnitude: 4.1
- Date-Time:
- Friday, August 07, 2009 at 03:33:18 UTC
- Friday, August 07, 2009 at 05:33:18 AM at epicenter
- Location: 51.623°N, 16.151°E
- Depth: 5 km (3.1 miles) set by location program
- Region: POLAND
- Distances
- 85 km (50 miles) NW of Wroclaw, Poland
- 100 km (65 miles) SSW of Poznan, Poland
- 125 km (80 miles) E of Cottbus, Germany
- 340 km (210 miles) W of WARSAW, Poland
- Location Uncertainty: horizontal +/- 5.5 km (3.4 miles); depth fixed by location program
- Parameters: NST= 25, Nph= 25, Dmin=142.4 km, Rmss=0.84 sec, Gp= 40°, M-type=body wave magnitude (Mb), Version=7
- Source: USGS NEIC (WDCS-D)
- Event ID: us2009kaaf
Historic Seismicity

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS
Note: the swarm in the center of image relates to the mining activity in the Lubin area. The second swarm of quakes in the image seen on the right [SE of Wroclaw, Poland, ] relates to the coal mining activity in the coal-rich region which extends from the Ostrava coal field in the Czech Republic to the south all the way to the Wujek coal field in Poland to the NW of the region.

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS
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