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Folio-sized Materials in USGS Library in Denver
USGS Library's collections and services are used by USGS staff and other researchers across the world.
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Bookshelves at USGS Library in Denver
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Paleomagnetic secular variation curve for the past two thousand years
Paleomagnetic secular variation curve for the past two thousand years. Label dates are mean ages before present (B.P.) or Anno Domini (AD), with gray circles indicating estimated error. Note that the magnetic field changes in declination (horizontal arched lines) and inclination (angled vertical lines) over time.
Paleomagnetic secular variation curve for the past two thousand years. Label dates are mean ages before present (B.P.) or Anno Domini (AD), with gray circles indicating estimated error. Note that the magnetic field changes in declination (horizontal arched lines) and inclination (angled vertical lines) over time.
1892 and 1894 cross-sections of Halemaʻumaʻu crater
Surveyor Frank Dodge's 1894 cross-section of Halema‘uma‘u overlaid on his 1892 cross-section. The 1892 lava lake was measured at 73 m (240 ft) below the rim of Halema‘uma‘u pit and by early-1894, the lava lake had filled the pit and frequently overflowed onto the caldera floor.
Surveyor Frank Dodge's 1894 cross-section of Halema‘uma‘u overlaid on his 1892 cross-section. The 1892 lava lake was measured at 73 m (240 ft) below the rim of Halema‘uma‘u pit and by early-1894, the lava lake had filled the pit and frequently overflowed onto the caldera floor.
1894 view of lava flows in Kaluapele
Photograph taken on March 20, 1894 looking up at the Halemaʻumaʻu lava lake perched atop a low dome on the floor of Kaluapele (Kīlauea caldera).
Photograph taken on March 20, 1894 looking up at the Halemaʻumaʻu lava lake perched atop a low dome on the floor of Kaluapele (Kīlauea caldera).