Map Figures

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Figure 1. Index map of Newberry Volcano, modified from Donnelly-Nolan and others, 2011. The yellow outline represents the full apron of lavas erupted during the volcano’s lifetime. It covers approximately 3,000 square kilometers (1,200 square miles), making this the largest volcano in the Cascades chain. Light green represents lavas erupted in the most recent 75,000 years. The stars represent post-glacial eruptive centers. Dark yellow represents post-glacial but pre-Mazama (7,700 years before present, yr B.P.) eruptive products; light red represents post-Mazama (most recent) flows. The dark blue outline is the Newberry National Volcanic Monument. The volcanic edifice itself occupies a much smaller area in the immediate vicinity of Newberry Caldera. Figure adapted from Donnelly-Nolan and others (2011).

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Figure 2. Map of color-shaded regional topography provided here for reference, derived from Shuttle Radar Topography Mission 30 (SRTM-30) digital elevation data. The thick black line represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Roads and select reference points, such as cities and nearby volcanic features, are also superimposed for reference. Broad geologic terranes and some specific features referred to in the text are labeled. (m, meters.) Figure 2 metadata.

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Figure 3. Map of regional magnetic field data for the U.S. Pacific Northwest. Different wavelengths are clearly visible at the California-Oregon border transition, caused by aeromagnetic surveys with different flight-line spacings. Volcanoes are shown as triangles. (nT, nanoteslas.) Figure 3 metadata.

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Figure 4. Map of complete Bouguer gravity anomaly (CBA) map for the U.S. Pacific Northwest. Occasional white gaps are caused by gravity station separations greater than 12 kilometers and generally represent rugged terrain. Volcanoes are shown as triangles. (Gravity anomaly reduced for a density of 2.67 grams per cubic centimeter (g/cc), in milliGals (mGal).) Figure 4 metadata.

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Figure 5. Map of magnetic data for central Oregon, superimposed over shaded-relief topography. The thick black outline depicts the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Paulina Peak represents the high point on the south rim of Newberry Volcano’s caldera; roads and select landmarks are shown to orient the reader. The southern boundary of this figure is the California-Oregon border. (nT, nanoteslas.) Figure 5 metadata.

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Figure 6. Map of magnetic data for central Oregon with Centre for Exploration Targeting (CET) domain boundaries (explained in the text) superimposed over it. These boundaries separate discrete magnetic sources, including different flows and non-volcanic terrains, to a depth of as much as 15 kilometers. The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. The southern boundary of this figure is the California-Oregon border. (nT, nanoteslas.) Figure 6 metadata.

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Figure 7. Map of complete Bouguer gravity data for central Oregon, superimposed over shaded-relief topography. The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Paulina Peak identifies the actual location of Newberry’s main edifice. Roads and select landmarks are shown to orient the reader. Individual gravity station locations are represented by small plus (+) symbols, and gray areas indicate either beyond-the-study edges or gaps in the station-density exceeding 12 kilometers (due to rugged, inaccessible terrain). The southern boundary of this figure is the California-Oregon border. (Gravity anomaly reduced for a density of 2.67 grams per cubic centimeter (g/cc), in milliGals (mGal).) Figure7 metadata.

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Figure 8. Map of complete Bouguer gravity anomaly (CBA) map for central Oregon with Centre for Exploration Targeting (CET) domain boundaries (explained in text) superimposed over it. These boundaries mark discrete changes in density regimes to a depth of 50+ kilometers. The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. The southern boundary of this figure is the California-Oregon border. (Gravity anomaly reduced for a density of 2.67 grams per cubic centimeter (g/cc), in milliGals (mGal).) Figure 8 metadata.

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Figure 9. Map of the different magnetic datasets available in the public domain for the near vicinity of Newberry Volcano. Light green represents discrete aeromagnetic surveys acquired digitally, mostly since the mid-1980s; two surveys mentioned by number in the text (Oregon Survey Nos. 3066 and 4108) are labeled. Purple represents older analog aeromagnetic surveys for which data were later manually digitized by the U.S. Geological Survey. White represents the coarsest data, mostly 5- and 10-kilometer (km) spacing aeromagnetic data, acquired as part of the National Uranium Resource Evaluation (NURE) surveys of the late 1970s and early 1980s. The thick black line represents the maximum extent of flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Roads (darker purple lines) are also superimposed for reference. Figure 9 metadata.

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Figure 10. Map of the local magnetic field around Newberry Volcano, compiled by merging magnetic data from numerous sources. The magnetic field strength is represented in color draped over a contoured, shaded-relief topography. A careful comparison with figure 9 shows that edge-effects from data-splicing are apparent. The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. (nT, nanoteslas.) Figure 10 metadata.

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Figure 11. Map of the same local magnetic field data for Newberry Volcano shown in figure 10 after an analytic signal filter has been passed over it. Here edge effects are more clearly obvious in abrupt transitions, for instance at 44° N. and 121° W. Consequently, it is not possible to use these data for depth-modeling calculations with any confidence. The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Figure 11 metadata.

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Figure 12. Map of the local Complete Bouguer gravity anomaly (CBA) field around Newberry Volcano draped over shaded-relief topography, which is shown here because it often correlates with gravity data. The quality (and wavelength-content) of the gravity data can be visually assessed from the density of stations; in this image a small plus (+) symbols represents gravity stations. Roads are not shown in this figure because they would obscure the gravity stations collected along them. The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. (Gravity anomaly reduced for a density of 2.67 grams per cubic centimeter (g/cc), in milliGals (mGal).) Figure 12 metadata.

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Figure 13. Map of apparent potassium content from National Uranium Resource Evaluation (NURE) radiometric data for the vicinity of Newberry Volcano. The data in this figure are quite coarse and flight-line dominated due to the wide flight-line spacing (see fig. 9). The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Figure 13 metadata.

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Figure 14. Map of apparent thorium content from National Uranium Resource Evaluation (NURE) radiometric data for the vicinity of Newberry Volcano. The data in this figure are quite coarse and flight-line dominated due to the wide flight-line spacing (see fig. 9). The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Figure 14 metadata.

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Figure 15. Map of apparent uranium content from National Uranium Resource Evaluation (NURE) radiometric data for the vicinity of Newberry Volcano. The data in this figure are quite coarse and flight-line dominated due to the wide flight-line spacing (see fig. 9). The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Figure 15 metadata.

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Figure 16. Map of the thorium/potassium ratio from National Uranium Resource Evaluation (NURE) radiometric data for the vicinity of Newberry Volcano. The data in this figure are quite coarse and flight-line dominated due to the wide flight-line spacing (see fig. 9). The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Figure 16 metadata.

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Figure 17. Map of the uranium/potassium ratio from National Uranium Resource Evaluation (NURE) radiometric data for the vicinity of Newberry Volcano. The data in this figure are quite coarse and flight-line dominated due to the wide flight-line spacing (see fig. 9). The thick black outline represents the maximum extent of lava flows associated with Newberry Volcano, equivalent to the yellow outline in figure 1. Figure 17 metadata.