Shipping and sonar generate ocean noise intense enough to affect millions of square miles

Evidence

Various surveys have measured the near-field power of such events and they are huge: a large tanker generates up to 200 dB, active sonar hits 180, dredging and drilling 185. Research by Linda Weilgart of Dalhousie University in Canada estimates that active naval sonar in the Pacific affects 3.9 million square miles of ocean. — George Michelsen Foy, Zero Decibels, 355

Categorization

• corroborated: 2 independent passages support this claim — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 355
• XREF: connects to: Ocean ambient noise levels have risen dramatically over the past sixty years — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 354; Background noise may prevent us from hearing an otherwise audible forest sound — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 1010

Broader Connections

• Background noise may prevent us from hearing an otherwise audible forest sound #expands (0.40) — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 1010