New findings suggest noise from ships overlaps frequencies used for communication and foraging by orcas, potentially affecting the endangered Southern Resident orcas living in the waters around Vancouver Island, B.C. The researchers found container ships created the highest levels of background noise at frequencies below 20,000 Hz, and military vessels typically had some of the […]
Tag: Vancouver Island
Understanding the surprising regularity of ‘slow’ earthquakes
Every 14 months, a ‘slow’ earthquake occurs beneath Vancouver island which last for 10 to 14 days; a new study helps explain why some slow quakes happen more frequently than others. Occurring along faults around the world at a depth of 25-40 km, slow earthquakes are undetectable by humans, but they vary in frequency, with […]
