This has been reported in nzherald.co.nz dated 5 June 2016.
The study had been commissioned by the DLNR and the North Pacific Marine Science Organisation. The aim of the study was to find out how much of the debris was from the Tohoku earthquake and tsunami, which struck Japan in 2011 and triggered the Fukushima disaster. This debris from tsunami was washing up on Hawaiian shores and throughout the Pacific over the past few years.
Accordingly, the researchers took up the task between August and November 2015. They used mapping software to identify debris along the shorelines and found that very little of the debris on the Hawaiian coastline was associated with the 2011 tsunami - most of it appeared to be ordinary garbage carelessly tossed away by humans.
The island of Niihau had nearly 8000 pieces of debris identified along its shores and 46 per cent was plastic. The island of Molokai was next with nearly 3000 bits of debris. Oahu had just 984 bits of debris identified by the survey - most of it (63 per cent) was made of plastic.
Image courtesy wikimediacommons.org
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