Pilgrim Hot Springs CSAMT measurements, Seward Peninsula, Alaska

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Frequently anticipated questions:


What does this data set describe?

Title:
Pilgrim Hot Springs CSAMT measurements, Seward Peninsula, Alaska
Abstract:
Pilgrim Hot Springs is in the Seward Peninsula, western Alaska, approximately 60 road miles north of Nome. Pilgrim Hot Springs has reported surface temperatures ranging from 145 degrees F to 160 degrees F (63 degrees C-71 degrees C) (Miller and others, 1973; Motyka and others, 1983). Due to the proximity to a large community, Pilgrim Hot Springs is considered a potential resource for providing power or direct-use heat. As a pilot study to inform ongoing investigation of the subsurface geology of Pilgrim Hot Springs, DGGS staff collected 29 controlled source and natural source audio magnetotelluric (CSAMT) readings to develop resistivity models of the study area. This data release provides Stratogem format raw data and resistivity models and depth slice grids in ASCII text and GeoTIFF format. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30472.
Supplemental_Information:
raw_data:    Field data form Stratogem control box, reprocessed Stratogem data, station locations, and field notes	
resistivity_models:    ACSII CSV format resistivity models in project coordinates with data field guides, figures and supporting documentation in ASCII text, PDF, KML, and/or other formats.	
vector_data:    Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format
  1. How might this data set be cited?
    Emond, A.M., and Daanen, R.P., 2020, Pilgrim Hot Springs CSAMT measurements, Seward Peninsula, Alaska: Raw Data File RDF 2020-9, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 5 p.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -164.930774
    East_Bounding_Coordinate: -164.895333
    North_Bounding_Coordinate: 65.090711
    South_Bounding_Coordinate: 65.085194
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2016
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 3
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -165
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      Planar coordinates are specified in Meters
      The horizontal datum used is World Geodetic System of 1984.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257223563000025.
  7. How does the data set describe geographic features?
    raw_data
    Field data form Stratogem control box, reprocessed Stratogem data, station locations, and field notes (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))
    resistivity_models
    ACSII CSV format resistivity models in project coordinates with data field guides, figures and supporting documentation in ASCII text, PDF, KML, and/or other formats. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))
    vector_data
    Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    This work was supported by State of Alaska general funds and Howard Trott, who provided the Stratagem EH4 transmitter.
  3. To whom should users address questions about the data?
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

Due to the proximity to a large community, Pilgrim Hot Springs is considered a potential resource for providing power or direct-use heat. To inform ongoing investigation of the geology of Pilgrim Hot Springs, DGGS staff collected 29 controlled source and natural source audio magnetotelluric (CSAMT) readings to develop resistivity models of the study area. These data were acquired as a pilot study to determine if CSAMT data would provide new insight into the subsurface geology.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2016 (process 1 of 1)
    Data collection, processing, reporting - CSAMT data were acquired throughout the study area using a Stratagem EH4 standard transmitter electrical resistivity imaging system from August 9th to 11th, 2016. Electrodes were 50 meters apart. Electrode dipoles and magnetic coils were oriented east-west and north-south. Stations were located with a WAAS enabled L1 handheld GPS units. Data were evaluated for quality. In some cases, the natural source signals were low amplitude and often poor quality. All poor time series were deleted from the data. Using IMAGEM software, one-dimensional inversion models were created for east-west and north-south orientations.
  3. What similar or related data should the user be aware of?
    Motyka, R.J., Moorman, M.A., and Liss, S.A., 1983, Geothermal resources of Alaska: Miscellaneous Publication MP 8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:2,500,000

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Data were evaluated for quality before generating resistivity and depth slice models. In some cases, the natural source signals were low amplitude and often poor quality. All poor time series were deleted from the data.
  2. How accurate are the geographic locations?
    Stations were located with a WAAS enabled L1 handheld GPS units.
  3. How accurate are the heights or depths?
    Not applicable
  4. Where are the gaps in the data? What is missing?
    This release provides data directly downloaded from the Stratagem instrument with no editing and the reprocessed data used for modeling and interpretation. IMAGEM software is required to read these data. IMAGEM software and instructions are available from DGGS upon request.
  5. How consistent are the relationships among the observations, including topology?
    Data originate from one collection effort using the same specifications for all data. The originating coordinate system was retained for all publication products.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  1. Who distributes the data set? (Distributor 1 of 1)
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
  2. What's the catalog number I need to order this data set? RDF 2020-9
  3. What legal disclaimers am I supposed to read?
    The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 09-Sep-2020
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov
Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.50 on Wed Sep 09 19:25:21 2020