Weak earthquake close to the Severomuysky Tunnel, Russia

Severomuysky Tunnel - courtesy http://iguide.trave

Weak earthquake with epicenter 14 km NW Severomuysk (pop 3,962) and 98 km W Taksimo (pop 10,359).
Epicenter very close to the Severomuysky Tunnel.

Severomuysky Tunnel is a railroad tunnel on the Baikal Amur Mainline (BAM), in northwestern Buryatia, Russia.
It is named after the Severomuysky Range it cuts through.
The tunnel is 15,343 metres (50,338 ft) long, the longest in Russia (excluding metro lines, see List of tunnels by length for comparisons). The tunnel was put into operation on December 5, 2003 (signed off on November 30), with yet another announcement of the completion of the BAM project.

Work started in 1978. The tunnel was built through very difficult rock with four major faults and a great deal of underground water, some at 35 atmospheres (3.5 MPa) pressure. One method used was to pump liquid nitrogen into the rock, freezing the water until the cut could be sealed.
In September 1979 workers broke into a fault connected to a 12,000 cubic meter underground lake. This required building a drainage tunnel and delayed work for eighteen months. When it became clear that the tunnel would not be completed in time, a 28 km bypass was built (completed in 1987). This had a 4% grade and traffic was limited to 15 km/h. Passenger traffic was prohibited. A second bypass of 54 km was completed in 1989 which was safe for passenger trains. The tunnel was first used in 2003.  (some text : Wikipedia)

Most important Earthquake Data:
Magnitude : M 4.1
UTC Time : 2010-12-08 10:42:06.6 UTC
Local time at epicenter : local time 19:42:06.6 2010-12-08
Depth (Hypocenter) : 15 km
Geo-location(s) :
14 km NW Severomuysk (pop 3,962)
98 km W Taksimo (pop 10,359)

Links to important maps
Google satellite map of the area showing the kind of terrain the earthquake took place
USGS Seismic hazard map

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