| Database to accompany geologic map of the Katmai Volcanic Cluster, Katmai National Park, Alaska | |
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Data format: ArcInfo Coverage File or table name: a2-bndry Coordinate system: Transverse Mercator Theme keywords: volcanoes, pumice, geology, 1912, stratovolcano, explosive eruptions, lava flows |
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Abstract:
This digital publication contains all the geologic map information used to publish U.S. Geological Survey Geologic Investigations Map Series I-2778 (Hildreth and Fierstein, 2003). This is a geologic map of the Katmai volcanic cluster on the Alaska Peninsula (including Mount Katmai, Trident Volcano, Mount Mageik, Mount Martin, Mount Griggs, Snowy Mountain, Alagogshak volcano, and Novarupta volcano), and shows the distribution of ejecta from the great eruption of June, 1912 at Novarupta. Widely scattered erosional remnants of volcanic rocks, unrelated to but in the vicinity of the Katmai cluster, are also mapped. Distribution of glacial deposits, large landslides, debris avalanches, and surficial deposits are a snapshot of an ever-changing landscape. |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
This digital publication contains all the geologic map information used to publish U.S. Geological Survey Geologic Investigations Map Series I-2778 (Hildreth and Fierstein, 2003). This is a geologic map of the Katmai volcanic cluster on the Alaska Peninsula (including Mount Katmai, Trident Volcano, Mount Mageik, Mount Martin, Mount Griggs, Snowy Mountain, Alagogshak volcano, and Novarupta volcano), and shows the distribution of ejecta from the great eruption of June, 1912 at Novarupta. Widely scattered erosional remnants of volcanic rocks, unrelated to but in the vicinity of the Katmai cluster, are also mapped. Distribution of glacial deposits, large landslides, debris avalanches, and surficial deposits are a snapshot of an ever-changing landscape.
This database was constructed in order to produce a geologic map as a basis for understanding processes involved in the eruptions that built the Katmai volcanoes and to produce a volcano hazards assessment of the Katmai area.
All the geologic map information used to publish U.S. Geological Survey Geologic Investigations Series I-2778 is contained in this digital publication. This map shows the distribution and relations of volcanic and bedrock units in an area of Katmai National Park and vicinity. This metadata document contains information for the entire set of ArcInfo coverages included in this database. Where relevant information for individual coverages differs from that of the others, each coverage is documented separately in sequence in that metadata section. The following coverages are documented here: (the quadrangle name is represented by wildcard characters, **) **-geo, geologic polygons; **-bndry, quadrangle boundary; isopach, isopach map; samps, radiometric sample locations; vents, vent locations; struc, locations of structure measurements.
The information in this report is the most up-to-date available at the time of publication.
Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited for a scale of 1:63,360 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:63,360 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data. Acknowlegdement of the U.S. Geological Survey would be appreciated in products derived from these data.
Volcano Hazards Team, MS 910
preferred contact by e-mail
The database was compiled mainly in 1996-2001 from original geologic mapping by Wes Hildreth and Judy Fierstein (Hildreth and Fierstein, 2003). Initial preparation of the database was done by Tracey Felger. Joel Robinson and Dave Ramsey provided most of the GIS-expertise to bring the database and metadata to completion.
See Entity_Attribute_Information
Polygon and arc (chain-node) topology present in appropriate ArcInfo coverages. Other coverages are point, annotation or raster and do not require topologic relationships.
The report is intended to describe completely the igneous and volcanic products, volcanic vent locations, structural features and structural measurements at 1:63,360 scale. Geological information appropiatley mapped at larger scale has been omitted.
Well located data items are intended to have a horizontal poitional accuracy better than 0.5 mm at 63,360 scale, or within 31 meters on the ground. The general positional accuracy of each line in the database is indicated qualitatively within the LTYPE field in the Arc Attribute Table (see Attribute_Domain_Values). Points in the database are generally well located. The position of each data item is derived from a USGS 1:63,360 topographic base map, and therefore additonal inaccuracies may also be encountered that are within National Map Accuracy Standards.
No vertical positional data recorded
reference for identifying Horseshoe Island, now buried under Katmai caldera lake; and first recorded sighting of fumarole field on lower SE flank of Trident I
First recorded description of the "Mageik Landslide"
First-hand descriptions of Horseshoe Island (which is now buried under 250 m of lakewater)
First-hand descriptions of Horseshoe Island (which is now buried under 250 m of lakewater)
Horseshoe Island observations
Horseshoe Island observations, Katmai phreatic mud layers (description, interpretation)
geologic map
West Mageik Lake sill complex, interpretation
West Mageik Lake sill complex, interpretation
Tertiary volcanic rocks, commonly altered, are widespread north and south of upper Katmai River as mapped by Riehle and others, 1993. These are lumped with other basement rocks in unit bu by Hildreth and Fierstein (2003), as the rocks are unmapped and unstudied by those authors.
Distribution of Novarupta 1912 ejecta
interpretation of seismic records from 1912 eruption
Geologic linework was compiled on USGS 1:63,360 topographic maps by Hildreth and Fierstein. The linework was then scanned at 400 dpi, georeferenced, converted to vector data using the ArcInfo command GRIDLINE , and edited on-screen to repair errors visible at map scale by Joel E Robinson, David W Ramsey and Tracy Felgar. Polygon topology was created and each arc and polygon tagged on-screen. Structural information was digitized by hand on-screen. Plotfiles were created in ArcPlot. Individual quadrangles were then plotted with topography and check by Hildreth and Fierstein. Metadata created.
345 Middlefield Road
MS 910
Metadata imported.
Metadata imported.
Internal node number for the beginning of an arc (from-node).
ESRI
Internal node number for the end of an arc (to-node).
ESRI
Internal node number for the left polygon.
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Internal node number for the right polygon.
ESRI
Length of feature in internal units.
ESRI
Internal feature number.
ESRI
User-defined feature number.
ESRI
Internal feature number.
author
Boundary between geologic units; well located
authors
boundary between geologic units, approximately located
authors
boundary between geologic units, concealed
authors
boundary between individual lava flows within the same geologic unit
authors
boundary between geologic units, inferred
authors
margin of glacial ice
topographic base map, ice margins modified by authors
boundary of geologic unit (khi) concealed by 250 m of lakewater
Griggs, 1922; Fenner, 1930, 1950; authors
margin of body of water
topographic base map, authors
margins of map
authors
boundary between geologic unit and unmapped terrain
authors
margin of caldera
authors
margin of phreatic crater
authors
margin of volcanic crater
authors
headwall scarp of landslide
authors
crest of ejecta ring that accumulated around Novarupta vent
authors
arcuate faults around Novarupta vent
authors
rhyolite sills of West Mageik Lake (Pliocene)
Lowenstern and Mahood, 1991; Lowenstern and others, 1991; authors
Tertiary porphyritic granitoid dikes (Pliocene? and Miocene)
authors
dikes intruding Katmai lavas at SW caldera rim
authors
river (new river not found on base map, added by author)
topographic map
User-defined feature number.
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Area of feature in internal units squared.
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Perimeter of feature in internal units.
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Internal feature number.
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User-defined feature number.
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Internal feature number.
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Pumice-rich debris-flow deposits derived from 1912 Novarupta ejecta
authors
Lake and mudflat deposits; largely reworked 1912 pyroclastic material
authors
Phreatic explosion deposits; remobilized Novarupta 1912 pyroclastic debris
authors
Novarupta rhyolite lava dome
authors
Phantom dome block layer; strewnfield of scattered blocks of glassy dacite; remains of small transient plug dome destroyed during 1912 Novarupta eruption
authors
Katmai River pumice-rich debris-flow deposit; remobilized Novarupta ejecta
authors
Proximal Novarupta 1912 pumice-fall deposits of Episodes II and III
authors
Valley-filling ignimbrite of 6-7 June 1912 (Episode I), Novarupta eruption
authors
Pumiceous alluvium of 1912 Novarupta pyroclastic debris (1912 and younger)
authors
Alluvium (Holocene)
authors
Landslide deposits (Holocene)
authors
Rock glaciers (Holocene)
authors
Glacial deposits (Holocene); mostly unconsolidated till adjacent or near active glaciers but also including early Holocene moraines in lower Valley of Ten Thousand Smokes
authors
Glacial ice (Holocene); present-day glaciers and pockets of stagnant ice.
topographic map, modifications by authors
Surficial deposits, undivided (Holocene and late Pleistocene); includes talus, scree, colluvium, colluvially disturbed till, swamp deposits, and alluvium
authors
Glacial deposits (late Pleistocene); mostly unconsolidated till
authors
Andesite of innermost crater of Mount Griggs (late or middle Holocene)
authors
Andesite of inner cone of Mount Griggs (late or middle Holocene)
authors
Younger debris-avalanche deposits on Mount Griggs (early Holocene)
authors
Debris-flow deposit of northeast flank of Mount Griggs (early Holocene or latest Pleistocene
authors
Knife Peak debris-avalanche deposit on Mount Griggs (early Holocene or latest Pleistocene)
authors
Dacite of west flank of Mount Griggs (early Holocene or latest Pleistocene)
authors
Diamict of Griggs Fork (late Pleistocene)
authors
Andesite of the outer cone of Mount Griggs (late Pleistocene)
authors
Andesite windows of early edifice of Mount Griggs (middle Pleistocene)
authors
Alagogshak Creek flow from Alagogshak volcano (late Pleistocene)
authors
Proximal andesitic ejecta from Alagogshak volcano (late or middle Pleistocene)
authors
Alagogshak volcano; Andesite of east fork of Kejulik River (late and middle Pleistocene)
authors
Alagogshak volcano; Dacite east of middle fork of Angle Creek (late and middle Pleistocene)
authors
Alagogshak volcano; Andesite of Kejulik Cleaver (middle Pleistocene)
authors
Alagogshak volcano; Andesite of Angle Creek (middle Pleistocene)
authors
Alagogshak volcano; Andesite of northern outliers (middle Pleistocene)
authors
Alagogshak volcano; Basalt of middle outlier (middle Pleistocene)
authors
Alagogshak volcano; Andesite of southern outlier (middle or early Pleistocene)
authors
Alagogshak volcano; Andesite of westernmost outlier (early Pleistocene)
authors
Mount Martin; Proximal andesitic ejecta (Holocene)
authors
Mount Martin; Dacite and andesite lava flows (Holocene)
authors
Debris-avalanche deposits (Holocene) from Mount Mageik
authors
Mount Mageik; Andesite-dacite lava flows and proximal ejecta of East Summit (Holocene)
authors
Mount Mageik; Older andesite-dacite lava flows of East Summit (Holocene or latest Pleistocene)
authors
Mount Mageik; Andesite-dacite lava flows of North Summit (Holocene and late Pleistocene)
authors
Mount Mageik; Andesite-dacite lava flows and vent dome of Central Summit (late Pleistocene)
authors
Mount Maeik; Andesite-dacite lava flows of the Southwest Summit (late Pleistocene)
authors
Trident Volcano; Andesite-dacite lava flows and cratered ejecta cone of Southwest Trident (1953-1974)
authors
Trident Volcano; Dacite ignimbrite of Mageik Creek (late Pleistocene)
authors
Trident Volcano; Lithic pyroclastic-flow deposit of Mageik Creek (late Pleistocene)
authors
Trident Volcano; Andesite-dacite lava flows of West Trident (late Pleistocene)
authors
Dacite domes of Falling Mountain and Mount Cerberus (late Pleistocene); show clear affinity with Trident group
authors
Dacite domes at west and south periphery of Trident group (late and middle Pleistocene)
authors
Trident Volcano; Mafic pyroclastic complex of Trident I (late and middle Pleistocene)
authors
Trident Volcano; Andesite-dacite lava flows of Trident I (late and middle Pleistocene)
authors
Trident Volcano; Andesite-dacite lava flows and ejecta of East Trident (middle Pleistocene)
authors
Mount Katmai; Dacite lava of Horseshoe Island (1912)
authors
Katmai Canyon landslide deposit (1912); chaotic slide mass from south slope of Mount Katmai that took place on the night of 6/7 June 1912, triggered by seismicity accompanying collapse of Katmai caldera
authors; Hildreth, 1991; Abe, 1992
Mount Katmai; Hydrothermal explosion breccia of Katmai caldera rim (1912)
authors; Hildreth, 1991
Mount Katmai; Dacite lava flows of southeast slope (Holocene)
authors
Mount Katmai; Dacite agglutinate of west rim (early Holocene or late Pleistocene)
authors
Dacite scoria flow deposit of Knife Creek, from Mount Katmai (early Holocene or late Pleistocene)
authors
Mount Katmai; Pyroxene-rhyodacite lava flows capping south rim (early Holocene or late Pleistocene)
authors
Mount Katmai; Zoned scora-fall deposit on south rim (early Holocene or late Pleistocene)
authors
Mount Katmai; Lethe assemblage (early Holocene or late Pleistocene); pumiceous debris flows and hyperconcentrated sandflow deposits
authors
Mount Katmai; Hornblende-bearing rhyolite lava flow of south rim notch (late Pleistocene)
authors
Mount Katmai; Plinian pumice-fall and ignimbrite deposits of hornblende-bearing rhyodacite (late Pleistocene)
authors
Mount Katmai; Andesite-to-rhyodacite lavas and pyroclastic deposits of Southwest Katmai (late Pleistocene)
authors
Mount Katmai; Andesite-dacite lava flows and pyroclastic deposits of Northeast Katmai (late Pleistocene)
authors
Mount Katmai; Basaltic and andesitic lava flows and pyroclastic deposits of Northeast Katmai (late Pleistocene)
authors
Snowy Mountain Dacite lava dome (late Holocene)
authors
Rainbow River debris-avalanche deposit from Snowy Mountain (late Holocene)
authors
Andesite and dacite of Northeast Snowy Mountain (late and middle Pleistocene)
authors
Andesite of Southwest Snowy Mountain (late and middle Pleistocene)
authors
Andesite-dacite lavas of Mount Denison (late and middle? Pleistocene)
authors
Basalt of Rainbow River cone (middle Pleistocene)
authors
Miscellaneous volcanic rocks (early Quaternary and Pliocene); widely scattered erosional remnants of volcanic rocks, undeformed and relatively fresh, unrelated to the present-day Katmai volcanic cluster.
authors
Rhyolite ignimbrite of Ikagluik Creek (early Quaternary or Pliocene)
authors
Rhyolite sills of West Mageik Lake (Pliocene)
authors
Tertiary intrusive rocks (Pliocene and Miocene)
authors
Tertiary porphyritic granitoid dikes (Pliocene? and Miocene)
authors
Basement rocks, undivided (Tertiary to Jurassic)
authors
Novarupta lava dome
authors
ejecta cone rimming the inner of two craters nested in Mount Griggs' summit amphitheater
authors
ejecta cone rimming the outer of two nested craters inside Mount Griggs' summit amphitheater
authors
coarsely fragmental vent cone of Southwest Trident (unit tsw)
authors
debris-avalanche deposit (Holocene) from Mount Mageik; oldest, largest, and only clay-rich debris avalanche of three from Mageik
authors
Debris-avalanche deposit (Holocene) from Mount Mageik; monolithologic, blocky; younger than mda1, older than mda3
authors
Debris-avalanche deposit from Mount Mageik; mostly angular dacite lava blocks from Mageik that broke loose in June 1912.
authors, "Mageik Landslide" of Griggs (1920, 1922)
Proximal part of Rainbow River debris-avalanche deposit from Snowy Mountain (late-Holocene) that was overrun, then re-exposed, by advance and retreat of glaciers during the Little Ice Age.
authors
water
topographic base, additions by authors
fumarole
authors, Griggs (1922)
terrain not mapped by authors
authors
User-defined feature number.
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Internal feature number.
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Feature geometry.
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Internal node number for the beginning of an arc (from-node).
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Internal node number for the end of an arc (to-node).
ESRI
Internal node number for the left polygon.
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Internal node number for the right polygon.
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Length of feature in internal units.
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Internal feature number.
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User-defined feature number.
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boundary of the map area
author
User-defined feature number.
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author
isopach showing 1 meter of ash deposited during the 1912 Novarupta eruption
author
isopach showing 2 meters of ash deposited during 1912 Novarupta eruption
author
isopach showing 5 meters of ash deposited during the 1912 Novarupta eruption
author
isopach showing 10 meters of ash deposited during 1912 Novarupta eruption
author
Phantom dome block layer; strewnfield of scattered blocks of glassy dacite; remains of small transient plug dome destroyed during 1912 Novarupta eruption
author
Internal feature number.
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Feature geometry.
ESRI
Area of feature in internal units squared.
ESRI
Perimeter of feature in internal units.
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Internal feature number.
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User-defined feature number.
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author
location of sample taken for radiometric age dating
author
Internal feature number.
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Feature geometry.
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Area of feature in internal units squared.
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Perimeter of feature in internal units.
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Internal feature number.
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User-defined feature number.
ESRI
author
surface on which an attitude was taken, not implying sedimentation
surface on which an attitude was taken, not implying sedimentation
author
joint of fracture in rock on which an attitude was taken
author
author
author
Internal feature number.
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Feature geometry.
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Area of feature in internal units squared.
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Perimeter of feature in internal units.
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Internal feature number.
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User-defined feature number.
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author
location of a volcanic vent
author
Lines (arcs) are recorded as strings sets of sequential of vectors and are described in an arc attribute table ("filename".AAT). The lines define the boundaries of the map units and other delineated areas polygons as well as linear features such as but not limited to, faults, crater rims, and morain crests. These distinctions, including geologic characterizations of linear features, are recorded as attributes in the LTYPE field in the AAT. Map units (polygons) are described in a polygon attribute table ("filename".PAT). The identities of the map units from compilation sources are recorded in the PTYPE field of the PAT by unit symbol. Note that ArcInfo coverages cannot contain both polygon and point information, so only coverages with polygon information will have a polygon attribute table, and these coverages will not have a point attribute table. Files containing point features are described in a point attribute table ("filename".PAT). Examples of point features are, but not limited to, vents, strikes and dips, and sample locations. Almost all of the attributes in the various attribute tables included in the report are set or calculated by ArcInfo and include "filename"#, "filename"-ID, LENGTH, FNODE, TNODE, RPOLY, LPOLY, AREA, and PERIMETER. The rest are defined by the author as described above and include LTYPE, PTYPE, PTTYPE, STRIKE, DIP, $ANGLE, and SAMPLENO.
Box 25286
Denver Federal Center
This database, identified as I-2778, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
345 Middlefield Road
MS 910
prefered contact by e-mail