The South Baikal earthquake of 25 February 1999 had the main shock in the southwestern part of Lake Baikal. The source of a normal-slip mechanism was associated with the Obruchev (Primorsky)/Angara fault node. This was the strongest shock (MPSP = 6.0) in southern Baikal region over the past forty years after the MLH = 6.8 Central Baikal earthquake of 1959. The main shock, followed by a long sequence of aftershocks with different mechanisms, reached an intensity of VII–VIII at the epicenter, VI–VII in villages 15 to 30 km away on the northwestern and southeastern sides of Baikal, and IV–VI in neighboring towns of Irkutsk, Angarsk, and Ulan Ude. The earthquake occurred in the region for which a fifteen years pending seismic risk was predicted in 1994.

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