I recently presented the results of this project in the Friday seminar (TGIF) of Hawaiʻi Institute of Geophysics & Planetology, School of Ocean and Earth Science Technology, University of Hawaiʻi.
My TGIF talk can be found in this link:
http://www.hawaii.edu/epscor/2020/10/20/marine-electrical-imaging-reveals-novel-freshwater-transport-mechanism-in-hawaii/
The paper associated with these findings will soon be published in Science Advances (expected publication date: 11.25.2020).
IkeWai marine CSEM results first presented at AGU Annual Fall Meeting 2019
The results of the IkeWai marine CSEM project were presented for the first time at AGU Annual Fall Meeting that was held in San Fransico this year. The results include 2-D CSEM isotropic/anisotropic inversions and magnetic data that image the electrical resistivity and magnetic signature of submarine groundwater structures extending up to ~4 km offshore. Our poster attracted attention from Earth scientists and hydrologists.
University of Hawaiʻi News: Article about our Marine CSEM project
“Ocean sensors help UH researchers understand Hawaiʻi Island aquifers”
Read this article in the following link:
https://www.hawaii.edu/news/2019/04/09/ocean-sensors-hawaii-island-aquifers/
CSEM System Packing & Demobilazation
The backbone of the surface-towed CSEM system used in this survey are the Porpoise electric field receivers. We used a 1 km array with 4 Porpoises; each named after a fish that starts with the letter P: Parrotfish, Pike, Pompano, and Perch.
The packing & demobilization of the CSEM system took us 6 hours, primarily because of the extreme heat at the honokohau harbor.
With the help of Max, Brenden, Khaira and Keven, we got the CSEM system all packed before sunest, and even managed to celebrate the succesful completion of the survey at “the bar without a Poproise”.
Thank you all for following our survey blog!
Cheers,
Eric & the Survey Team
Marine Survey Completed!
Our last day of operation was dedicated for surveying 3 crosslines (perpendicular to the Kona coastline) situated in the northern section of the survey area, inline with the offshore trajectories of the Kiholo Bay and the Hualalai volcano. These crosslines will help us to (a) validate the data acquired from 7 inlines in this area, and (b) detect any localized submarine lava tubes that extend offshore from the Hualalai volcano.
This completes our successful survey! where we collected multiple datasets from ~250 km of towlines (total of 15 survey lines) encompassed within the boundaries of the Hualalai aquifer. This data will be utilized to detect, delineate, and understand both the spatial distribution and interconnectivity of deep submarine groundwater deposits, offshore Kona, the Island of Hawai’i.
As shown above, a family of dolphins escorted us during our last transit back to the Honokohau harbor at Kona, the island of Hawai’i.
Finally, I wish to thank all the wonderful people that made this marine project possible:
Gwen Jacobs, Steve Constable, Dallas Sherman, Khaira Ismail, Kevin Kelly, Michelle Choe, Ellen Koppenheffer, Jake Perez, Chris Armerding, John Souders, Jacques Lemire, James Barry, Jason Magalen, Brendan Hunter, Patrick Anderson, Max Sudnovsky, Steve Kennedy, Jason Hasler, Emily Wilson, Keith Olsen, Jan C War, Dean Towle, Keven Rinkenbach.
Videos from the survey can be viewed on ‘IkeWai Marine CSEM YouTube channel.