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Location: almost directly beneath Helena. Affected area: 363,000 square kilometers.
Damage: $4 million. A series of earthquakes beginning on October 3, 1935, shook the
area. The strongest of the shocks was on October 18. Several shocks of lesser intensity
were followed by a second strong earthquake on October 31 that destroyed many buildings
that had been previously damaged. The shocks continued with additional strong shocks
on November 21 and November 28. |