1905 Bolnai earthquake
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| Date | July 23, 1905 |
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| Origin time | 02:46:12 UTC |
| Magnitude | 8.4 MW |
| Depth | 15.0 km |
| Epicenter | 49°22′N 96°37′E / 49.37°N 96.61°ECoordinates: 49°22′N 96°37′E / 49.37°N 96.61°E |
| Areas affected | Mongolia |
The 1905 Bolnai earthquake occurred in or near the Asgat Sum of Zavkhan Province in Mongolia on 23 July. The earthquake has been estimated at 8.25 to 8.5 on the moment magnitude scale.
The Bolnai earthquake is believed to be a strike-slip rupture of a branch of the Bolnai Fault, extending about 300 to 375 km along the fault, and possibly an additional 80 km of the Teregtiin Fault. The fault displacement during the earthquake was greater than 6 m, and possibly as much as 11 m, and the duration is estimated at about two minutes.
The Bolnai earthquake was preceded by two weeks by the Tsetserleg earthquake, and is considered a part of the same general crustal movement.
There are few records of the immediate effects of the earthquake due to the remoteness of Outer Mongolia in 1905. However, rockslides were reported in the nearby mountains, and supposedly "two lakes, each of eight acres in size, disappeared".
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