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
7
mag
N.MEXICO
11-29-1852 T00:00:00
5.7
mag
S.CALIFORNIA
01-01-1927 T08:17:00
5.9
mag
S.CALIFORNIA
05-27-1862 T20:00:00
6.3
mag
S.CALIFORNIA
03-11-1933 T01:54:7.8
6.4
mag
S.CALIFORNIA
12-25-1899 T12:25:00
5.2
mag
S.CALIFORNIA
08-31-1930 T00:40:38
6
mag
S.CALIFORNIA
07-11-1855 T04:15:00
7.5
mag
S.CALIFORNIA
12-21-1812 T19:00:00
6.7
mag
WESTCOAST,USA
01-17-1994 T12:30:55.3
7.3
mag
S.CALIFORNIA
11-04-1927 T13:50:43




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
4.2
mag
CALIFORNIA:MONTCLAIR
07-20-2007 T11:42:22
7.9
mag
CALIFORNIA:SANFRANCISCO
04-18-1906 T13:12:21
5.5
mag
CALIFORNIA:NORTHERN
02-15-1856
6.2
mag
CALIFORNIA-NEVADA:CHALFANTVALLEY
07-21-1986 T14:42:26
6.1
mag
CALIFORNIA:MAMMOTHLAKES
05-25-1980 T16:33:44
6.3
mag
CALIFORNIA:SANTACRUZ
10-08-1865
6.1
mag
CALIFORNIA:CENTRAL:MORGANHILL
04-24-1984 T21:15:19
5.6
mag
CALIFORNIA:SANJOSE
10-31-2007 T03:04:54
6.9
mag
CALIFORNIA:LOMAPRIETA
10-18-1989 T00:04:15
7.8
mag
CALIFORNIA:OWENSVALLEY
03-26-1872