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USGS: Helena, MT
Federal Bldg
Park & Clark

Agency Number: HFB Structure: 4-story Bldg
Latitude: 46.5900
Longitude: -112.0400
Instrument: Basement
Site Geology: rock
Owner: United States Geological Survey (external link)
References

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Helena Aftershock, Montana 1935-11-28 14:41:48 UTC Epicentral dist: 6.3 km
Summary page for this earthquake Plot Acceleration
Component: 0 PGA (cm/s/s): -74.85 PGV (cm/s): -3.22 Add this to bin
Component: Up PGA (cm/s/s): -31.74 PGV (cm/s): -1.42 Add this to bin
Component: 90 PGA (cm/s/s): -83.06 PGV (cm/s): -3.88 Add this to bin

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