Where on (Google) Earth #413?

Let’s see if I remember how to blog…

It’s been a while since I played or won a Where on (Google) Earth?, but I broke my dry spell earlier this week by pinpointing some pretty piedmont glaciers in WoGE #412 at earth’s finest interior.

I suppose the best way to get back into blogging is to just jump right in, so with no further ado I present an oblique submarine view for WoGE #413.  The first person to successfully locate the coordinates and geologic significance of the scene below will have the opportunity to host the next WoGE on their own geoblog.

WoGE 413

Anchors aweigh!

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3 Responses to Where on (Google) Earth #413?

  1. Christoph says:

    The image shows the Tuscaloosa seamount NE of the Hawai’ian island of Oahu (N22.03° W157.07°). Despite the fact that it looks like a drowned volcano with a flat top due to wave erosion, it is not of primary volcanic origin. The seamount is part of a huge landslide deposit. The mass movement is called Nuuanu landslide and occurred probably 2 Ma ago. The slide volume is approximately 3,000 km³ for the subaerial headwall and 2,000 km³ for the submarine headwall. The debris volume is estimated as 3,000 km³ . It is very, very likely that it caused a significant tsunami whose run-up height might have been as high as 100 m for the north coast of Oahu.
    Microfossil dating constrains the mantling sediment [of the seamount] to have been deposited between 2.5 and 3.3 Ma, [indicating] that landsliding occurred prior to or near the end of shield building at Koʻolau Volcano (2.9 Ma).

    References:
    - Moore, J. G. & Clague, D. A. 2013. Mapping the Nuuanu and Wailau Landslides in Hawaii, in Hawaiian Volcanoes: Deep Underwater Perspectives (eds E. Takahashi, P. W. Lipman, M. O. Garcia, J. Naka and S. Aramaki), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM128p0223
    - Morgan, J.K., Resig, J.M. & Siesser, W.G. 2006. Microfossil assemblages on Tuscaloosa Seamount and their constraints on the age of the Nuʻuanu landslide, north of Oahu, HI. Journal of Volcanology and Geothermal Research, 151 (1–3), 269–278.

    - Satake, K., Smith, J.R. & Shinozaki, K. 2002. Three-Dimensional Reconstruction and Tsunami Model of the Nuuanu and Wailau Giant Landslides, Hawaii. Hawaiian Volcanoes: Deep Underwater Perspectives, Geophysical Monograph 128, 333-346.