Figure 5 - uploaded by Sonia J. Rowley
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KOK1616 figure showing characteristic bait station fauna. Cook seamount: (a) Pisces V deploying bait, (b) Synaphobranchus devouring bait. McCall seamount: (c) Pisces V deploying bait, (d) Heterocarpus laevigatus carrying bait and Dalatias licha. Lōʻihi seamount: (e) Synaphobranchus carrying bait, (f, h) Somniosus pacificus inspecting Pisces IV and, (g) an overambitious Heterocarpus sp. Images: (f, g) M. Garland, (a, c) T. Kerby, (b, d, e, h) L. Lamar.
Source publication
Expedition Summary
This research project aimed to explore and describe the benthic biodiversity and geological history of
the little-studied Geologist seamounts, Cook and McCall, as well as revisit Hawai‘i’s youngest and most
active seamount, Lōʻihi. A total of six submersible dives were conducted. These dives yielded six bait
stations, seven geolo...
Context in source publication
Context 1
... formal observational analysis was not strictly possible due to obscured observations on some of the dives; however, a thorough account of what was observed is provided below. Typical megafaunal- scavenger taxa present ( Figure 5, Appendix II) and actively feeding at all bait stations included eels of the genus Synaphobranchus. The shrimp Nematocarcinus tenuirostris Spence & Bate, 1888, and Heterocarpus spp. ...
Citations
The Hawaiian Ridge has long been a focus site for studying lithospheric flexure due to intraplate volcano loading, but crucial load and flexure details remain unclear. We address this problem using wide‐angle seismic refraction and reflection data acquired along a ∼535‐km‐long profile that intersects the ridge between the islands of Maui and Hawai'i and crosses 80–95 Myr‐old lithosphere. A tomographic image constructed using travel time data of several seismic phases reveals broad flexure of Pacific oceanic crust extending up to ∼200–250 km either side of the Hawaiian Ridge, and vertically up to ∼6–7 km. The P‐wave velocity structure, verified by gravity modeling, reveals that the west flank of Hawaii is comprised of extrusive lavas overlain by volcanoclastic sediments and a carbonate platform. In contrast, the Hāna Ridge, southeast of Maui, contains a high‐velocity core consistent with mafic or ultramafic intrusive rocks. Magmatic underplating along the seismic line is not evident. Reflectors at the top and bottom of the pre‐existing oceanic crust suggest a ∼4.5–6 km crustal thickness. Simple three‐dimensional flexure modeling with an elastic plate thickness, Te, of 26.7 km shows that the depths to the reflectors beneath the western flank of Hawai'i can be explained by volcano loading in which Maui and the older islands in the ridge contribute ∼43% to the flexure and the island of Hawai'i ∼51%. Previous studies, however, revealed a higher Te beneath the eastern flank of Hawai'i suggesting that isostatic compensation may not yet be complete at the youngest end of the ridge.
