Mauna Loa: Geologic Map

provided by William Chadwick. This map is Figure 5 from the paper

Moore, J.G., and W.W. Chadwick, Jr., 1995, Offshore Geology of Mauna Loa and Adjacent Areas, Hawaii, in Rhodes, J.M. and J.P. Lockwood (eds.), Mauna Loa Revealed: Structure, Composition, History, and Hazards, American Geophysical Union, Washington, D.C., pp. 21-44.

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For a smaller image (608x390 pixels, 169052 bytes) of the same map, see AGU's page Mauna Loa in technicolor.

Reconnaissance geologic map of south Hawaii region. Explanation of units:

"Terrestrial lava" - Subaerially erupted and quenched, largely basaltic. Tbh, historic; TbQ, prehistoric lava.
"Submerged terrestrial lava" - Stb, submerged subaerial lava with previous shorelines (commonly marked by coral reefs) shown by dotted lines with apparent age in ka. Includes some post-submergence subaerially-erupted lava flows that crossed the shoreline.
"Fragmental quenched lava" - Fb, generated from subaerially-erupted lava that crossed a shoreline and was subaqueously quenched and fragmented. Largely sand-sized, but includes material to block size and some pillow lava. Includes historic material offshore from historic lava ocean entries.
"Subaqueous lava" - Subaqueously erupted and quenched, largely basaltic pillow lava. SbQ, Quaternary lava associated with Hawaiian Ridge; light color where relatively flat. SbK, weathered Cretaceous basaltic lava of non-Hawaiian seamounts that are heavily coated with MnFe oxides; similar in age to the underlying Cretaceous oceanic crust.
"Landslides" - Ls, slumps that are generally coherent, though faulted, and La, debris avalanches that are extensively fragmented and contain isolated blocks. General landslide names in upper case type.
"Abyssal sediment" - As, includes pelagic sediment, turbidites, and airfall volcanic ash.