Identification_Information: Citation: Citation_Information: Originator: Frank A. Trusdell Originator: Richard B. Moore Publication_Date: 2006 Title: Geologic Map Of The Middle East Rift Geothermal Subzone, Kilauea Volcano, Hawaii. Edition: version 1.0 Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: USGS Geologic Investigations Series Issue_Identification: I-2614 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/imap/2614 Description: Abstract: Kilauea is an active shield volcano in the southeastern part of the Island of Hawaii (see index map). The middle east rift zone (MERZ) map includes about 27 square kilometers of the MERZ and shows the distribution of the products of 37 separate eruptions during late Holocene time. Lava flows erupted during 1983–96 have reached the mapped area. The subaerial part of the MERZ is 3–4 km wide and about 18 km long. The MERZ receives more than 100 in. of rainfall annually and is covered by tropical rain forest. Vegetation begins to grow on lava a few months after its eruption. Relative heights of trees can be a guide to relative ages of underlying lava flows, but proximity to faults, presence of easily weathered cinders, and human activity also affect the rate of growth. The map is based on detailed field mapping conducted by Trusdell and Moore. The rocks have been grouped into five basic age groups. The framework for the ages assigned is provided by eight radiocarbon ages from previous mapping and a single date from the current mapping effort. The numerical ages are supplemented by observations of stratigraphic relations, degree of weathering, soil development, and vegetative cover. Purpose: The purpose of the map is to present the geology of the active Kilauea shield volcano in the southeastern part of the Island of Hawaii. This middle east rift zone (MERZ) map includes about 27 square kilometers of the MERZ and shows the distribution of the products of 37 separate eruptions during late Holocene time. Lava flows erupted during 1983–96 have reached the mapped area and are shown on the map. Supplemental_Information: Files included in this dataset: Shapefiles include geo_poly, point, and kalalua. Base files include kalalua_rec.tfw and kalalua_rec.tif. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -155.067028 East_Bounding_Coordinate: -154.996522 North_Bounding_Coordinate: 19.463472 South_Bounding_Coordinate: 19.407157 Keywords: Theme: Theme_Keyword_Thesaurus: AGI Glossary of Geology Theme_Keyword: geologic map Theme_Keyword: volcano Theme_Keyword: Quaternary Theme_Keyword: shield volcano Theme_Keyword: lava flows Theme_Keyword: radiocarbon ages Theme_Keyword: basalt Place: Place_Keyword_Thesaurus: Board of Geographic Names Place_Keyword: USA Place_Keyword: Hawaii Place_Keyword: Kilauea volcano Place_Keyword: Island of Hawaii Access_Constraints: None. Use_Constraints: None. Acknowledgment of the U.S. Geological Survey would be appropriate in products derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Frank A. Trusdell Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: Hawaii Volcano Observatory P.O. Box 51 Hawaii National Park City: Hawaii Volcano Observatory State_or_Province: HI Postal_Code: 96718-0051 Country: USA Contact_Voice_Telephone: 808-967-8812 Contact_Electronic_Mail_Address: trusdell@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/imap/2614/downloads/pdf/2614map_508.pdf Browse_Graphic_File_Description: graphic representation of map layout Browse_Graphic_File_Type: PDF Data_Set_Credit: Frank A. Trusdell and Richard B. Moore mapped the study area in 1990-94. The database was created by Frank A. Trusdell. Native_Data_Set_Environment: ARCINFO Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attributes were checked by manually comparing hard copy plots of the digital data with the source materials. Authors and USGS map editor performed separate reviews. Logical_Consistency_Report: Map elements were visually checked by the authors for overshoots, undershoots, duplicate features, and other errors. ARC/INFO software was used to create topological relations among features. Completeness_Report: Data are complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The data were created by adding geologic contacts and other features on a scale-stable greenline of a USGS 7.5-minute topographic map at 1:24,000 scale. The database was created by digitizing the contacts and other features on the scale-stable base. Geologic map units were digitized at an appropriate resolution for portrayal on a base at 1:24,000 scale. Features on the map are estimated to be accurately located within about 20 m horizontally. Lineage: Process_Step: Process_Description: The geologic database was digitized by Frank A. Trusdell in 2004. The metadata file was compiled by Craig Brunstein. Process_Date: 2004-06 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Transverse Mercator Transverse_Mercator: Scale_factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.0000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000004 Ordinate_Resolution: 0.000004 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: This database consists of three shapefiles (geo_poly, point, and kalalua) plus georeferenced topographic base files (kalalua_rec.tfw and kalalua_rec.tif). Entity and attribute information is readily available by looking at the shapefiles in ArcCatalog using the "Preview/Table" tabs and the "File/Properties" pull-down menu, looking at the attribute tables in ArcCatalog, and using the DESCRIBE command in command-line Arc. Such information is listed below. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Shapefile geo_poly FEATURE CLASSES Number of Attribute Spatial Feature Class Subclass Features data (bytes) Index? Topology? ------------- -------- --------- ------------ ------- --------- ARCS 232 54 POLYGONS 111 132 Yes NODES 171 SECONDARY FEATURES Tics 4 Arc Segments 7130 Polygon Labels 110 TOLERANCES Fuzzy = 0.900 V Dangle = 0.000 V COVERAGE BOUNDARY Continue? yes Xmin = 283017.000 Xmax = 290350.375 Ymin = 2147180.000 Ymax = 2153328.750 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Shapefile point FEATURE CLASSES Number of Attribute Spatial Feature Class Subclass Features data (bytes) Index? Topology? ------------- -------- --------- ------------ ------- --------- POINTS 1 52 SECONDARY FEATURES Tics 4 TOLERANCES Fuzzy = 0.000 N Dangle = 0.000 N COVERAGE BOUNDARY Xmin = 287280.813 Xmax = 287280.813 Ymin = 2149968.500 Ymax = 2149968.500 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Shapefile kalalua FEATURE CLASSES Number of Attribute Spatial Feature Class Subclass Features data (bytes) Index? Topology? ------------- -------- --------- ------------ ------- --------- ARCS 92 106 NODES 30 SECONDARY FEATURES Tics 4 Arc Segments 156 TOLERANCES Fuzzy = 0.686 N Dangle = 0.000 N COVERAGE BOUNDARY Xmin = 283567.250 Xmax = 290423.594 Ymin = 2147282.000 Ymax = 2152319.250 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Explanation of map unit symbols: Each map unit is designated by a three-, four-, or five-part symbol: (1) a letter, either s [for spatter] or f [for spatter and (or) flow], (2) a numeral 5–9, indicating the age group; (3) a letter, a–g, designating the petrographic type of tholeiitic basalt; and (4) a supplementary one- or two-digit numeral (sequential within each age group), if necessary, that distinguishes units in the same age group having the same petrographic symbol (for example, f9d2, f9d3, f9d4). The year of historic eruption is indicated next to the symbol. Age groups [After Wolfe and Morris (1996). Numbers smaller than 5 refer to age groups recognized elsewhere on the Island of Hawaii but not represented on this part of Kilauea volcano.] 9 Historic (1790 and younger) 8 200–400 years old 7 400–750 years old 6 750–1,500 years old 5 1,500–3,000 years old Petrographic classification of tholeiitic basalt All rocks in the mapped area are tholeiitic basalt. Rocks have been placed in one of seven categories, a through g, based on respective abundances of olivine and plagioclase phenocrysts; most rocks have less than 1 percent pyroxene phenocrysts. The assignments were made in the field and represent megascopic estimates of the volume percentages of each kind of phenocryst. In a few cases, noted in the individual descriptions of map units, abundances of olivine or plagioclase phenocrysts vary slightly from the following values. a = picritic (> 15 percent olivine, <1 percent plagioclase) b = 10–15 percent olivine, <1–4 percent plagioclase c = 5–10 percent olivine, <1–4 percent plagioclase d = <1–4 percent olivine, <1–4 percent plagioclase e = 5–10 percent plagioclase, variable (<1–12 percent) olivine f = >10 percent plagioclase, 1–3 percent olivine g = aphyric (<1 percent phenocrysts) Map units as shown in the attribute tables: f9d2 f9d3 f9d4 s9d5 f9d5 f9e4 f9d6 s9d1 f9d1 s9g1 f9g1 f8d4 s8c1 f8c1 s8c2 f8c2 s8d1 f8d1 f8g1 s8g3 f8g3 s8g4 f8g4 s8g5 f8g5 f8g6 f8g7 s8g8 f8g8 s8d8 f8d8 f8d9 f8d10 f8d11 f7g4 s7d19 f7d19 s7d20 f7d20 f7b1 f7c6 s7d15 f7b5 f7d22 f7c13 f6g3 s6d14 f6d14 s6g4 f6g4 f5g2 Other map symbols as shown in the attribute tables: ground crack fault, graben (Graben) fissure, vent (Fissure vent) FT-92-24 (Sample locality for radiocarbon-dated sample) Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Denver Publishing Service Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-5589 Contact_Electronic_Mail_Address: tpinto@usgs.gov Distribution_Liability: Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARC SHP Format_Version_Number: unknown File_Decompression_Technique: ZIP archive (Windows) Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/imap/2614 Fees: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: USGS Information Services Box 25286 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Resource_Description: http://pubs.usgs.gov/imap/2614/ Distribution_Liability: None Standard_Order_Process: Non-digital_Form: Available as one printed map sheet. Fees: for current charges please see http://store.usgs.gov/ Metadata_Reference_Information: Metadata_Date: 2006 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Frank Trusdell Contact_Address: Address_Type: mailing and physical address Address: Hawaii Volcano Observatory P.O. Box 51 Hawaii National Park City: Hawaii Volcano Observatory State_or_Province: HI Postal_Code: 96718-0051 Country: USA Contact_Voice_Telephone: 808-967-8812 Contact_Facsimile_Telephone: 303-236-5349 Contact_Electronic_Mail_Address: trusdell@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2") Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: none