Magnitude: VEI-6
Time: -1860 B.C.
Country: UNITEDSTATES

US-WASHINGTON

This volcano erupted on -1860 B.C. in UnitedStates where it released a signifant amount of explosivity , reaching a Volcanic Explosivity Index of 6 (VEI: 6). The VEI scale was developed by the USGS and is open-ended with the largest volcanoes in history given a magnitude 8. A value of 0 is given for non-explosive eruptions . This particular volcano, named St.Helens is classified as a historical stratovolcano and is perched at an elevation of 2549ft.


Surface Geology

Underlying geological composition for the surrounding area.

Alaska Peninsula and Aleutian Islands - porphyry copper
Tertiary felsic to intermediate composition intrusions of the Alaska Peninsula and Aleutian Islands
Pacific Margin - porphyry copper
Cretaceous through middle Tertiary volcanic and intrusive rocks representing a series of continental- and island-arc systems accreted and superimposed onto the paleomargin of northeast Asia.

Surface Lithology

Qv - Igneous - Volcanic
Youngest volcanic rocks

Related USGS Publications

70159748 - 2016 - Unusually large tsunamis frequent a currently creeping part of the Aleutian megathrust
70142817 - 2015 - Basement and regional structure along strike of the Queen Charlotte Fault in the context of modern and historical earthquake ruptures
sir20155110 - 2015 - 2013 volcanic activity in Alaska: summary of events and response of the Alaska Volcano Observatory



Latest Volcano Events

Recent Volcano activity from around the globe.



Nearby Tsunamis
6.7
mag
MONTEREYBAY,N.CALIFORNIA
03-03-1901 T07:45:00
7
mag
N.MEXICO
11-29-1852 T00:00:00
5.7
mag
S.CALIFORNIA
01-01-1927 T08:17:00
7.3
mag
S.CALIFORNIA
11-04-1927 T13:50:43
7.3
mag
S.CALIFORNIA
03-26-1872 T10:30:00
6.9
mag
N.CALIFORNIA
10-18-1989 T00:04:15.2
6.3
mag
N.CALIFORNIA
10-08-1865 T20:46:00
5.5
mag
N.CALIFORNIA
02-15-1856 T13:25:00
6.8
mag
N.CALIFORNIA
10-21-1868 T15:53:00
7.9
mag
N.CALIFORNIA
04-18-1906 T13:12:00




Volcano Measurement
volcano scale

Volcano Stats
year -1860
id 11
location US-Washington
time -1860 B.C.
latitude 46.2
type Stratovolcano
vei 6
status Historical
elevation 2549
name St.Helens
longitude -122.18
country UnitedStates

Nearby Earthquakes
6.5
mag
CALIFORNIA:SONOMACOUNTY
03-31-1898
6.1
mag
CALIFORNIA:NAPA,VALLEJO
08-24-2014 T10:20:06
5.0
mag
CALIFORNIA:NAPA
09-03-2000 T08:36:30
4.8
mag
CALIFORNIA:SANTAROSA
10-02-1969 T04:56:46
6.2
mag
CALIFORNIA:WINTERS
04-21-1892
5.6
mag
CALIFORNIA:OROVILLE
08-01-1975 T20:20:12
5.0
mag
NEVADA:FALLON
04-26-2008 T06:40:10
6.2
mag
CALIFORNIA:HONEYDEW,WHITETHORN,PETROLIA
08-17-1991 T19:29:40
7.1
mag
CALIFORNIA:HUMBOLDTCOUNTY:FERNDALE,PETROLIA
04-25-1992 T18:06:04
5.9
mag
CALIFORNIA:HUMBOLDTCOUNTY
03-02-1871