Multiple Data Acquisition​ ​

Today we acquired the following datasets: Electrical (CSEM), Magnetic (magnetometer), seafloor Multi-beam (MBES)/Backscatter, and Magnetometer data. The survey got into its own rhythm, where all crew members are working in synergy, making the operation to feel nearly effortless and all done in good spirit! I thank the survey crew members for all of their hard work! as well as Jason & Emily that are doing an excellent job in operating the chase boat, protecting our Porpoise array from transient fishing and leisure boats.

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Admiral chart navigational map superimposed by the survey track, representing the multiple data acquisition over the last 2 survey days.
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Real-time magnetic anomaly detection, as observed in the data stream coming from the G-882 magnetometer, and displayed on the Hypack system.
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Brenden discusses Jason about the optimization process of the MBES data acquisition.

The Survey Continues​

Today, we continued our survey starting from Kiholo Bay that is located approximately 29 km north of Kailua-Kona. After 2 hours of transit to the survey starting point, we deployed the multi-beam transducer, followed by the deployment of the Porpoise CSEM system and the G-882 magnetometer. To make our Porpoise array more visible to the regional boats, we added 2 small buoys within the 250 m Porpoise spacing and one large red fender at the end of the array. All data types were collected along a 15 km profile. We resolved minor technical issues on the fly.

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The view of the Hualalai volcano from the Huki Pono survey boat.
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Brenden Deploys the G-882 magnetometer, which follows the boat 30 m behind at 6 m water depth.
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We all waiting for a green flash at sunset time, which came and looked phenomenal.

 

Our Marine Survey Began​!​

Today we began our survey! We acquired CSEM data, as well as multi-beam seafloor and water column data along a survey crossline. The Kona coastline has a fair amount of boat traffic, which made it challenging for our chase boat to clear the survey track for the Huki Pono and protect our Porpoise array at the same time. All things considered, we had a long and hectic day but fairly productive.

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Eric is giving a boat tour and explanation about the different data acquisition​ systems to Steve, Jason, ​and Emily, the chase boat team from UH Hilo marine operation​s.
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An admiral chart of the survey region displayed on the captain’s screen, as Breden adds survey lines to the HyPack navigation software.
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Jason & Patrick preparing the multi-beam for deployment.
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Patch test for multi-beam calibration.
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Recovery of the CSEM Porpoise array at sunset.

Instruments Mobilization & Setup – Day 2

Today we finalized the assembling of the CSEM system, mobilized and integrated the G-882 magnetometer system with the Hypack navigation system and the MagLog data logging software. We also mobilized and tested the Boston Whaler chase boat, which is owned and operated by the Natural Energy Laboratory. The role of the chase boat is to clear our survey track and to prevent fishing boats from crossing between the Huki Pono survey boat and the end of our Porpoise array (1 km in length).

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Jake & Dallas assembling one of the Porpoise frames.
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Dallas adding the GPS mast to the CTD frame.
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Eric & Dallas discussing the survey geometry.
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The G-882 marine magnetometer lying on the deck.
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Our Boston Whaler chase boat berthing next to the Huki Pono survey boat.
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The harbor turtle came to check-out our operation.

Tomorrow we plan to calibrate the multi-beam system and hopefully start the survey, depending on weather conditions as it is quite windy, due to hurricane Olivia that currently passes nearby the Island.

Instruments Mobilization & Setup – Day 1

Today we mobilized and set up the CSEM and multi-beam systems onboard the Huki Pono survey boat. We tested the two CSEM transmitters (Main unit: 150 Amp output current; Spare unit: 50 Amp output current) with a dummy-load, and they both operate as expected. The multi-beam head was adjusted to the ideal depth of transmission and tested successfully. After all, we had a pretty good first day, as team members worked together to prepare the boat for the survey. Thank guys for all of your hard work!

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Dallas is preparing and marking the Porpoise’s GPS units.
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Eric performs a test to the CSEM transmitter B150.
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Jake prepares the Zephyr GPS station for time sync and the setup of the electromagnetic and navigation data loggers.

Tomorrow we have another mobilization day and instrument testing before the survey starts on Friday, September 7th.