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
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Component:
Up
PGA (cm/s/s):
-31.74
PGV (cm/s):
-1.42
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Component:
90
PGA (cm/s/s):
-83.06
PGV (cm/s):
-3.88
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