Passive monitoring NWTRC TM557

About

Passive acoustic monitoring was conducted in the Navy’s Northwest Training Range Complex from July 2013 to April 2014 to detect marine mammal and anthropogenic sounds. Three baleen whale species were detected: blue whales, fin whales, and humpback whales. Minke whale boings, which were first recorded in the NWTRC in November 2012, were not detected during this monitoring period. Likewise, North Pacific right whale up-calls were detected for the first time in the NWTRC in June 2013, but there were no definitive detections of this species during this recording period. Frequencymodulated echolocation pulses from three beaked whale species were detected at the offshore site. Three anthropogenic sounds were detected in the recordings: mid-frequency active and low-frequency active sonars, and explosions.