So, How DeepIsthe Mariana Trench?

James V. Gardner, Andrew A. Armstrong, Brian R. Calder, Jonathan Beaudoin
2014 Marine Geodesy  
HMS Challenger made the first sounding of Challenger Deep in 1875 of 8184 m. Many have since claimed depths deeper than Challenger's 8184 m, but few have provided details of how the determination was made. In 2010, the Mariana Trench was mapped with a Kongsberg Maritime EM122 multibeam echosounder and recorded the deepest sounding of 10,984 ± 25 m (95%) at 11.329903 • N/142.199305 • E. The depth was determined with an update of the HGM uncertainty model combined with the Lomb-Scargle
more » ... -Scargle periodogram technique and a modal estimate of depth. Position uncertainty was determined from multiple DGPS receivers and a POS/MV motion sensor.
doi:10.1080/01490419.2013.837849 fatcat:tiilow2c6fhijlb76qegfwu35u