Distant calls can sound strange

2011/01/25 in Acoustic analysis, northern resident, offshore, southern resident, transient

This evening from about 17:00 to 21:00 there were some great calls heard by humans and auto-recorded at Orcasound (and to a much more limited extent at Lime Kiln). Early on (listen to the 17:00-19:00 hour recordings), the calls were faint but the background noise level was low (~97 dB re 1 microPa). The result was a series of calls that sounded pretty strange, especially with the echoes that were audible under such quiet conditions.

These S4 calls are reminiscent of low-frequency calls from a baleen whale, like a humpback, complete with echoes:
PWRAveDb_96_01_23_2011_17_51_08.mp3

And these S10 calls (and whistles?) make for a very unusual recording:
PWRAveDb_97_01_23_2011_19_06_25.mp3

The complete suite of 79 detections (only 1 from Lime Kiln) are listed below:


2011-01-23 17:48:43
node=os dB=96 trigger=PWR


2011-01-23 17:50:04
node=os dB=96 trigger=PWR


2011-01-23 17:51:08
node=os dB=96 trigger=PWR


2011-01-23 17:55:20

node=os dB=97 trigger=PWR


2011-01-23 18:04:12
node=os dB=96 trigger=PWR

2011-01-23 18:04:36
node=os dB=96 trigger=PWR

2011-01-23 18:12:33
node=os dB=96 trigger=PWR


2011-01-23 18:12:48
node=os dB=96 trigger=PWR


2011-01-23 18:15:12
node=os dB=96 trigger=PWR


2011-01-23 18:53:49
node=os dB=98 trigger=PWR


2011-01-23 19:02:23

node=os dB=96 trigger=PWR


2011-01-23 19:04:13
node=os dB=98 trigger=PWR

2011-01-23 19:06:25
node=os dB=97 trigger=PWR

2011-01-23 19:08:24
node=os dB=96 trigger=PWR


2011-01-23 19:08:48
node=os dB=95 trigger=PKT


2011-01-23 19:11:06
node=os dB=95 trigger=PKT


2011-01-23 19:25:40
node=os dB=97 trigger=PWR


2011-01-23 19:36:04

node=os dB=96 trigger=PWR


2011-01-23 19:40:08
node=os dB=95 trigger=PWR

2011-01-23 19:43:38
node=os dB=95 trigger=PWR

2011-01-23 19:44:17
node=os dB=96 trigger=PWR


2011-01-23 19:45:32
node=os dB=96 trigger=PWR


2011-01-23 19:46:07
node=os dB=96 trigger=PWR


2011-01-23 19:49:21
node=os dB=96 trigger=PWR


2011-01-23 19:55:51

node=os dB=95 trigger=PWR


2011-01-23 19:57:28
node=os dB=95 trigger=PKT

2011-01-23 19:57:43
node=os dB=95 trigger=PKT

2011-01-23 19:57:58
node=os dB=95 trigger=PKT


2011-01-23 19:58:24
node=os dB=96 trigger=PKT


2011-01-23 19:59:12
node=os dB=97 trigger=PKT


2011-01-23 20:00:07
node=os dB=95 trigger=PKT


2011-01-23 20:01:38

node=os dB=95 trigger=PKT


2011-01-23 20:03:20
node=lk dB=95 trigger=PKT

2011-01-23 20:03:49
node=os dB=97 trigger=PWR

2011-01-23 20:04:40
node=os dB=96 trigger=PKT


2011-01-23 20:04:55
node=os dB=97 trigger=PWR


2011-01-23 20:05:32
node=os dB=96 trigger=PKT


2011-01-23 20:05:51
node=os dB=95 trigger=PKT


2011-01-23 20:06:06

node=os dB=96 trigger=PKT


2011-01-23 20:07:42
node=os dB=96 trigger=PKT

2011-01-23 20:07:57
node=os dB=94 trigger=PKTPWR

2011-01-23 20:08:14
node=os dB=95 trigger=PKT


2011-01-23 20:09:30
node=os dB=96 trigger=PKT


2011-01-23 20:13:26
node=os dB=97 trigger=PWR


2011-01-23 20:15:03
node=os dB=95 trigger=PKT


2011-01-23 20:15:33

node=os dB=96 trigger=PKT


2011-01-23 20:15:48
node=os dB=95 trigger=PKT

2011-01-23 20:17:16
node=os dB=95 trigger=PWR

2011-01-23 20:17:31
node=os dB=95 trigger=PKT


2011-01-23 20:23:47
node=os dB=96 trigger=PWR


2011-01-23 20:24:48
node=os dB=96 trigger=PWR


2011-01-23 20:25:03
node=os dB=95 trigger=PWR


2011-01-23 20:27:07

node=os dB=94 trigger=PKT


2011-01-23 20:30:16
node=os dB=97 trigger=PWR

2011-01-23 20:31:01
node=os dB=96 trigger=PKT

2011-01-23 20:32:25
node=os dB=98 trigger=PKT


2011-01-23 20:32:48
node=os dB=96 trigger=PWR


2011-01-23 20:33:31
node=os dB=95 trigger=PKT


2011-01-23 20:34:10
node=os dB=95 trigger=PKT


2011-01-23 20:35:48

node=os dB=96 trigger=PKT


2011-01-23 20:36:03
node=os dB=95 trigger=PKTPWR

2011-01-23 20:36:18
node=os dB=95 trigger=PWR

2011-01-23 20:36:45
node=os dB=96 trigger=PKT


2011-01-23 20:37:32
node=os dB=95 trigger=PKT


2011-01-23 20:38:04
node=os dB=96 trigger=PKT


2011-01-23 20:38:30
node=os dB=98 trigger=PWR


2011-01-23 20:38:45

node=os dB=96 trigger=PKT


2011-01-23 20:39:00
node=os dB=97 trigger=PKT

2011-01-23 20:39:15
node=os dB=95 trigger=PKT

2011-01-23 20:39:30
node=os dB=96 trigger=PKT


2011-01-23 20:39:48
node=os dB=97 trigger=PKT


2011-01-23 20:40:51
node=os dB=97 trigger=PKT


2011-01-23 20:41:06
node=os dB=97 trigger=PKT


2011-01-23 20:41:21

node=os dB=96 trigger=PWR


2011-01-23 20:45:15
node=os dB=98 trigger=PKT

2011-01-23 20:45:30
node=os dB=97 trigger=PWR

2011-01-23 20:47:14
node=os dB=98 trigger=PKT


2011-01-23 20:47:29
node=os dB=98 trigger=PKT


2011-01-23 20:51:56
node=os dB=100 trigger=PWR

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