Volcano Name:St. Helens Smithsonian Inst ID (SI_VNUM): 321050
Alternate Name:
Agua Caliente Hot Springs
Dogs Head
East Dome
Goat Rocks
Harry's Spa Hot Springs
Lawalaclough
Lawelatla
Loowit Boulder Basin Hot Springs
Loowit Source Hot Springs
Loowit Travertine Hot Springs
Loowitlatkla
Milt's Pond Hot Springs
Northwest Dome
Steamy Gulch Hot Springs
Step Canyon Hot Springs
Sugar Bowl
Tahonelatclah
Volcano Type:Stratovolcano(es)
Latitude: 46.2000000000
Longitude: -122.1833333000
Region:Canada and Western USA Sub Region:US-Washington
Date Entered:02/05/2012
 
Eruption Details
Eruption Start Date:27/3 /1980 Date Error:
Eruption End Date: Dating Technique:Historical records
Eruption Date Quality:High quality Preferred Date:Y
Bulk DRE Volume (km3): 0.440 (Literature)
Bulk deposit volume (km3): 1.300 (Literature)
Ignimbrite DRE Volume (km3): 0.050 (Calculated)
Ignimbrite Deposit Volume : 0.140 (Calculated)
Magnitude : 4.800 (Literature)
Maximum Intensity : 11.060 (Column Height)
Maximum VEI : 5.000 (Literature)
Tephra fall DRE Volume (km3): 0.300 (Literature)
Tephra fall Deposit Volume (km3): 1.200 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:15/01/1800 Date Error:
Eruption End Date: Dating Technique:Dendrochronology
Eruption Date Quality:High quality Preferred Date:Y
Bulk DRE Volume (km3): 0.400 (Literature)
Bulk deposit volume (km3): 1.500 (Literature)
Magnitude : 5.000 (Calculated)
Maximum Column Height (km): 16.000 (Literature)
Maximum Intensity : 10.190 (Column Height)
Maximum VEI : 5.000 (Literature)
Tephra fall DRE Volume (km3): 0.400 (Literature)
Tephra fall Deposit Volume (km3): 1.500 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:15/01/1482 Date Error:
Eruption End Date: Dating Technique:Dendrochronology
Eruption Date Quality:High quality Preferred Date:Y
Bulk DRE Volume (km3): 0.400 (Literature)
Bulk deposit volume (km3): 1.500 (Literature)
Magnitude : 5.000 (Calculated)
Maximum Column Height (km): 21.000 (Literature)
Maximum Intensity : 10.640 (Column Height)
Maximum VEI : 5.000 (Literature)
Tephra fall DRE Volume (km3): 0.400 (Literature)
Tephra fall Deposit Volume (km3): 1.500 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:15/01/1480 Date Error:
Eruption End Date: Dating Technique:Dendrochronology
Eruption Date Quality:High quality Preferred Date:Y
Bulk DRE Volume (km3): 2.000 (Literature)
Bulk deposit volume (km3): 7.700 (Literature)
Magnitude : 5.700 (Calculated)
Maximum Column Height (km): 24.000 (Literature)
Maximum Intensity : 10.700 (Eruption Rate)
Maximum VEI : + 5.000 (Literature)
Tephra fall DRE Volume (km3): 2.000 (Literature)
Tephra fall Deposit Volume (km3): 7.700 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:-530 Date Error:
Eruption End Date: Dating Technique:Radiocarbon (corrected)
Eruption Date Quality:Low quality Preferred Date:Y
Bulk DRE Volume (km3): 0.300 (Literature)
Bulk deposit volume (km3): 1.200 (Literature)
Magnitude : 4.900 (Calculated)
Maximum Column Height (km): 15.000 (Literature)
Maximum Intensity : 10.060 (Column Height)
Maximum VEI : 5.000 (Literature)
Minimum Column Height (km): 11.000 (Literature)
Minimum Intensity : 9.540 (Column Height)
Tephra fall DRE Volume (km3): 0.300 (Literature)
Tephra fall Deposit Volume (km3): 1.200 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:2900 BP Date Error:
Eruption End Date: Dating Technique:Not Available
Eruption Date Quality:No information Preferred Date:Y
Bulk DRE Volume (km3): 0.100 (Literature)
Bulk deposit volume (km3): 0.400 (Literature)
Magnitude : 4.400 (Calculated)
Maximum Column Height (km): 11.000 (Literature)
Maximum Intensity : 9.000 (Eruption Rate)
Maximum VEI : 5.000 (Literature)
Tephra fall DRE Volume (km3): 0.100 (Literature)
Tephra fall Deposit Volume (km3): 0.400 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:-1770 Date Error:100
Eruption End Date: Dating Technique:Tephrochronology
Eruption Date Quality:Not Entered Preferred Date:Y
Bulk DRE Volume (km3): 0.900 (Literature)
Bulk deposit volume (km3): 3.500 (Literature)
Magnitude : 5.400 (Calculated)
Maximum Column Height (km): 23.000 (Literature)
Maximum Intensity : 10.600 (Eruption Rate)
Maximum VEI : 5.000 (Literature)
Tephra fall DRE Volume (km3): 0.900 (Literature)
Tephra fall Deposit Volume (km3): 3.500 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:-1860 Date Error:
Eruption End Date: Dating Technique:Radiocarbon (corrected)
Eruption Date Quality:No information Preferred Date:Y
Bulk DRE Volume (km3): 4.000 (Literature)
Bulk deposit volume (km3): 15.300 (Literature)
Magnitude : 6.000 (Calculated)
Maximum Column Height (km): 31.000 (Literature)
Maximum Intensity : 11.000 (Eruption Rate)
Maximum VEI : 6.000 (Literature)
Tephra fall DRE Volume (km3): 4.000 (Literature)
Tephra fall Deposit Volume (km3): 15.300 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:-2340 Date Error:
Eruption End Date: Dating Technique:Radiocarbon (corrected)
Eruption Date Quality:Not Entered Preferred Date:Y
Bulk DRE Volume (km3): 0.300 (Literature)
Bulk deposit volume (km3): 1.200 (Literature)
Magnitude : 4.900 (Calculated)
Maximum Column Height (km): 22.000 (Literature)
Maximum Intensity : 10.480 (Eruption Rate)
Maximum VEI : 5.000 (Literature)
Tephra fall DRE Volume (km3): 0.300 (Literature)
Tephra fall Deposit Volume (km3): 1.200 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:12000 BP Date Error:
Eruption End Date: Dating Technique:Not Available
Eruption Date Quality:Low quality Preferred Date:Y
Bulk DRE Volume (km3): 1.800 (Literature)
Bulk deposit volume (km3): 4.320 (Calculated)
Magnitude : 5.600 (Calculated)
Maximum VEI : 5.000 (Literature)
Magma: Andesite-Dacite
Calculated Density:
Rock Classification:
Dacite
Andesite
Eruption Start Date:14000 BP Date Error:
Eruption End Date: Dating Technique:Not Available
Eruption Date Quality:Low quality Preferred Date:Y
Bulk DRE Volume (km3): 1.500 (Literature)
Bulk deposit volume (km3): 3.600 (Calculated)
Magnitude : 5.600 (Calculated)
Maximum VEI : 5.000 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:20000 BP Date Error:
Eruption End Date: Dating Technique:Not Available
Eruption Date Quality:Low quality Preferred Date:Y
Bulk DRE Volume (km3): < 0.850 (Literature)
Bulk deposit volume (km3): < 2.040 (Calculated)
Magnitude : < 5.300 (Calculated)
Maximum VEI : 5.000 (Literature)
Eruption Start Date:40000 BP Date Error:
Eruption End Date: Dating Technique:Radiocarbon and stratigraphy
Eruption Date Quality:Low quality Preferred Date:Y
Bulk DRE Volume (km3): >= 0.400 (Assumed)
Bulk deposit volume (km3): >= 1.000 (Assumed)
Magnitude : 5.000 (Calculated)
Maximum VEI : ? 5.000 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:42500 BP Date Error:7500
Eruption End Date: Dating Technique:Stratigraphy
Eruption Date Quality:Low quality Preferred Date:Y
Bulk DRE Volume (km3): 4.300 (Literature)
Bulk deposit volume (km3): 10.320 (Calculated)
Magnitude : 6.300 (Literature)
Maximum VEI : ? 5.000 (Literature)
Magma: Dacite
Calculated Density:
Rock Classification:
Dacite
Eruption Start Date:300000 BP Date Error:
Eruption End Date: Dating Technique:Stratigraphy
Eruption Date Quality:Low quality Preferred Date:Y
Bulk DRE Volume (km3): > 1.000 (Literature)
Bulk deposit volume (km3): > 2.400 (Calculated)
Magnitude : 5.400 (Calculated)
Maximum VEI : 5.000 (Literature)

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