Page 27: of Marine Technology Magazine (January 2026)

Read more on the Chignik data in ScienceAdvances Vol.9, No.17, Rapid shallow megathrust afterslip from the 2021 M8.2 Chignik Alaska earthquake revealed after sea? oor geodesy.

The USGS Wave Glider recovered aboard the R/V North

Wind after a successful survey.

Worth the wait, even when wait- ing on weather

The technique is not without its chal- lenges, however. After gathering the po- sitions of the Aleutian subduction zone transponders, Ericksen and his team

Bathy2 were naturally keen to see the data.

Due to the signi? cant amounts of data

The latest evolution in involved – we’re talking 25-30 GB per site (comprising three Fetch) – only sub- bathymetric measurement samples are sent back to shore from the

USV, primarily for quality control.

So, they have to wait until the USV

Density corrected depth data directly from comes back – or is brought back – to one instrument alongside the ?exibility of shore. Low levels of daylight in the

Alaskan winter (when the Chignik sur- interchangeable pressure modules vey was carried out) meant limited pow- er availability for the USV.

Combined with bad weather, coordinat- ing its recovery proved challenging, re-

[email protected] | +44 1803 869292 | valeport.co.uk sulting in it taking four-months to recov- er the Wave Glider and of? oad the data.

Still, the wait was worthwhile and the results are providing greater insights than we’ve ever had before.

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