Significant Earthquake

Date Earthquake Location Earthquake Parameters
Focal
Depth		 Magnitude MMI Int
Year Mo Dy Hr Mn Sec Name Latitude Longitude Mw Ms Mb Ml Mfa Unk
1935 10 31 18 37 47.0 MONTANA: HELENA 46.600 -112.000 6.0 5.5 8
Significant Earthquake
Earthquake Effects Total Effects (Earthquake and Tsunami, Volcano, etc.)
Deaths Missing Injuries Damage Houses
Destroyed		 Houses
Damaged		 Deaths Missing Injuries Damage Houses
Destroyed		 Houses
Damaged
Num De Num De Num De $Mill De Num De Num De Num De Num De Num De $Mill De Num De Num De
2 1 6.000 3 2 1 6.000 3


Comments for the Significant Earthquake

Comments for the Significant Earthquake

Display listing of nearby significant earthquakes

This aftershock was almost as severe as the main tremor on Oct. 19. Two people were killed at Helena, and about $1 million in property damage occurred, bringing the death toll from this series to four and the damage total to $4 million. It intensified the damage in all the towns and damaged structures weakened by previous shocks. Most residents described it as sharper and more pronounced than the main earthquake on Oct 19. (Reference #542)

Reference #1250 lists $6 million damage.


References for the Significant Earthquake

References for the Significant Earthquake

ID Author Year Citation
542 Stover, Carl W., and Jerry L. Coffman 1993 Seismicity of the United States, 1568-1989 (Revised), U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, Washington, D.C.
1250 Centre for Research on the Epidemiology of Disasters (CRED) and the U.S. Office of Foreign Disaster Assistance (OFDA) 2001 EM-DAT: The OFDA/CRED International Disaster Database, Universite Catholique de Louvain, Brussels, Belgium, link