Volcano Name VNUM Latitude Longitude Region Sub-region Volcano Type Unit name Eruption start day Eruption start month Eruption start year Year BP Date Error Dating technique Date quality Alternate values Tephra fall deposit volume Qualifier Error Alternate values Tephra fall DRE volume Qualifier Error Quality Alternate values Ignimbrite deposit volume Qualifier Error Quality Alternate values Ignimbrite DRE volume Qualifier Error Quality Alternate values Primary intra caldera deposit volume Qualifier Error Quality Alternate values Primary intra caldera DRE volume Qualifier Error Quality Alternate values Bulk deposit volume Qualifier Error Quality Alternate values Bulk DRE volume Qualifier Error Quality Alternate values Magma Type Magma Density Magnitude Qualifier Derivation Alternate values VEI Qualifier Derivation Alternate values Column height Min Column height Max Column height Average Alternate values Intensity Min Intensity Max Intensity Average Alternate values
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) 1980 AD 27 3 1980 -30 Historical records High quality No 1.2 No .3 ? No .14 ? No .05 ? No 1.3 1 Yes .44 1 Yes Dacite 4.8 Literature No 5 Literature No No 11.06 Yes
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) T (Goat Rocks) 15 01 1800 150 Dendrochronology High quality No 1.5 No .4 ? No 1.5 3 Yes .4 3 No Dacite 5 Calculated No 5 Literature No 16 No 10.19 Yes
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) We (Kalama) 15 01 1482 468 Dendrochronology High quality No 1.5 No .4 ? No 1.5 3 Yes .4 3 No Dacite 5 Calculated No 5 Literature No 21 No 10.64 Yes
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) Wn (Kalama) 15 01 1480 470 Dendrochronology High quality No 7.7 No 2 ? No 7.7 3 No 2 3 No Dacite 5.7 Calculated No 5 Literature No 24 No 10.7 Yes
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) Ps/Pu (Pine Creek) -530 2480 Radiocarbon (corrected) Low quality No 1.2 No .3 ? No 1.2 3 No .3 3 No Dacite 4.9 Calculated No 5 Literature No 11 15 No 9.54 10.06 Yes
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) Ye (Smith Creek) -1770 3720 100 Tephrochronology Low quality No 3.5 No .9 ? No 3.5 3 Yes .9 3 Yes Dacite 5.4 Calculated No 5 Literature No 23 Yes 10.6 Yes
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) Yn (Smith Creek) -1860 3810 Radiocarbon (corrected) Low quality No 15.3 No 4 ? No 15.3 3 Yes 4 3 Yes Dacite 6 Calculated No 6 Literature No 31 No 11 No
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) Yb (Smith Creek) -2340 4290 Radiocarbon (corrected) Low quality No 1.2 No .3 ? No 1.2 3 Yes .3 3 No Dacite 4.9 Calculated No 5 Literature No 22 No 10.48 Yes
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) J (Jg, Jb, Jy) (Swift Creek) 12800 Radiocarbon (corrected) Medium quality No 4.32 1 No 1.8 1 No Andesite-Dacite 5.6 Calculated No 5 Calculated No No No
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) J (Jg, Jb, Jy) (Swift Creek) 12800 Radiocarbon (corrected) Medium quality No 4.32 1 No 1.8 1 No Andesite-Dacite 5.6 Calculated No 5 Calculated No No No
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) S (So, Sg) (Swift Creek) 16000 Radiocarbon (corrected) Medium quality No 3.6 1 No 1.5 1 No Dacite 5.6 Calculated No 5 Calculated No No No
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) M (Mm, Mp, Mc, Mo, Mg) (Cougar) 20000 Not Available Low quality No 2.04 < 1 No .85 < 1 No 5.3 < Calculated No 5 Literature No No No
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) Cb (Ape Canyon) 40000 Radiocarbon and stratigraphy Low quality No 1 >= 0 No .4 >= 0 No Dacite 5.3 Calculated No 5 ? Literature No No No
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) C (Cs, Cy, Cm, Cw, Ct) (Ape Canyon) 42500 Stratigraphy Low quality No 10.32 1 No 4.3 1 No Dacite 6 Calculated Yes No No
St. Helens 321050 46.2 -122.1833333 Canada and Western USA USA (Washington) Stratovolcano(es) Summer Lake OO tephra 300000 Stratigraphy Low quality No 2.4 > 1 No 1 > 1 No 5.4 Calculated No 5 Literature No No No