USGS HOME
Contact USGS
Volcano Hazards Program
Find a U.S. Volcano
Adagdak
Akutan
Amak
Amukta
Aniakchak
Atka Volcanic Complex
Augustine
Behm Canal-Rudyerd Bay
Black Peak
Bobrof
Bogoslof
Buldir
Buzzard Creek
Carlisle
Chagulak
Chiginagak
Cleveland
Dana
Davidof
Denison
Douglas
Duncan Canal
Dutton
Edgecumbe
Emmons Lake volcanic center
Fisher
Fourpeaked
Frosty
Gareloi
Great Sitkin
Griggs
Hayes
Herbert
Iliamna
Imuruk Lake
Ingakslugwat Hills
Isanotski
Kagamil
Kaguyak
Kanaga
Kasatochi
Katmai
Kialagvik
Kiska
Koniuji
Kukak
Kupreanof
Little Sitkin
Mageik
Makushin
Martin
Moffett
Mount Churchill
Mount Recheshnoi
Novarupta
Okmok
Pavlof
Pavlof Sister
Redoubt
Roundtop
Saint Paul Island
Seguam
Segula
Semisopochnoi
Shishaldin
Snowy Mountain
Spurr
St. Michael
Steller
Stepovak Bay group
Takawangha
Tana
Tanaga
Tlevak Strait-Suemez Island
Trident
Ugashik-Peulik
Ukinrek Maars
Uliaga
Unnamed (near Ukinrek Maars)
Veniaminof
Vsevidof
Westdahl
Wide Bay
Wrangell
Yantarni
Yunaska
Ofu-Olosega
Ta'u Island
Tutuila Island
San Francisco Volcanic Field
Uinkaret Volcanic Field
Clear Lake Volcanic Field
Coso Volcanic Field
Lassen Volcanic Center
Long Valley Caldera
Mammoth Mountain
Medicine Lake volcano
Mono Lake Volcanic Field
Mono-Inyo Chain
Mount Shasta
Salton Buttes
Ubehebe Craters
Dotsero Volcanic Center
Haleakala
Hualalai
Kama'ehuakanaloa Seamount
Kilauea
Mauna Kea
Mauna Loa
Black Butte Crater lava field
Craters of the Moon Volcanic Field
Hells Half Acre lava field
Wapi Lava Field
Soda Lakes
Carrizozo lava flow
Red Hill-Quemado Volcanic Field
Valles Caldera
Zuni-Bandera Volcanic Field
Agrigan
Ahyi Seamount
Alamagan
Anatahan
Asuncion
Daikoku seamount
East Diamante
Esmeralda Bank
Farallon de Pajaros
Fukujin seamount
Guguan
Kasuga 2
Maug Islands
Pagan
Ruby
Sarigan
South Sarigan seamount
Supply Reef
Zealandia Bank
Belknap Crater
Blue Lake Crater
Cinnamon Butte
Crater Lake
Davis Lake volcanic field
Devils Garden lava field
Diamond Craters volcanic field
Jordan Craters volcanic field
Mount Bachelor
Mount Hood
Mount Jefferson
Newberry
Sand Mountain volcanic field
Three Sisters
Black Rock Desert Volcanic Field
Markagunt Plateau Volcanic Field
Glacier Peak
Indian Heaven Volcanic Field
Mount Adams
Mount Baker
Mount Rainier
Mount St. Helens
West Crater volcanic field
Yellowstone
Assess
Prepare
Forecast
|
Activity
Products
Observatories
About
Volcano Updates
Monitoring
Hazards
Education
Multimedia
Glossary - Block and ash flow
Block and ash flow
Flow of
ash
and angular rock fragments larger than 26 cm or 10 in.
Glossary Terms
A
‘A‘ā
Agglutinate
Alluvium
Andesite
Ash
Ash-flow tuff
B
Back-arc basin
Basalt
Basaltic andesite
Base surge
Batholith
Benchmark
Bishop Tuff
Block and ash flow
Bomb
Breadcrust Bomb
C
Caldera
CE
Cinder cone
Cirque
Composite volcano
Coulee
Crust
Cryptodome
Cumulo-volcano
D
Dacite
Debris avalanche
Debris dam
Deformation
Diamict
Dike
Directed blast
DOAS
Dome
Drainage
E
Edifice
Effusive eruption
Ejecta
Emission
Eruption column
Explosive eruption
Extensional tectonic environment
F
Facies
Fallout
Fissure
FTIR
Fumarole
G
Glacier
H
Holocene
Hydrology
Hydrothermal explosion
I
Igneous
ignimbrite
Intrusive
Isopach
K
K-Ar
ka
L
Lahar
Lateral Blast
Lava
Lava flow
Lava fountain
Lava lake
Lava tube
Lithic
Littoral cone
M
Ma
Maar
Mafic
Magma
Magma chamber
Mantle
Moat
Monogenetic
O
Obsidian
Ophiolite
P
Pāhoehoe
Paleomagnetic studies
Petrologic
Phreatic eruption
Phreatomagmatic eruption
Pillow lava
Pleistocene
Plinian
Postglacial
Pumice
Pyroclast
Pyroclastic flow
pyroclastic surge
Q
Quaternary
R
Resurgent dome
Rhyodacite
Rhyolite
S
Scoria
Sedimentary rocks
Seismic swarm
Seismic tomography
Seismicity
Shield volcano
Silica
Silicic
Sinter
Spatter cone
Stratigraphy (Stratigraphic)
Stratovolcano
Subaerial
Subduction
Submarine volcano
T
Tectonic
Tephra
Tertiary
Thermal
Tsunami
Tuff
Tumulus
U
Unconsolidated
V
VEI
Vent
Volcaniclastic