Latest loud boom in the San Juan Islands under investigation

Another loud boom was heard by  residents of parts of San Juan Island at 7:15 a.m. Tuesday, December 10, 2019. According to a San Juan County Sheriff's Deputy they can't disclose anything at this time as the matter is part of an open investigation. The previous incident is also part of the investigation. 

The December 10 boom was heard by folks in Portland Fair and Pear Point Road.

The one that occurred at 11:33 p.m. December 3  was heard in the Roche Harbor and Yacht Haven areas and in the Town of Friday Harbor. 

Descriptions of the December 3 incident included:

"Heard a very loud sound at about 1130.  It woke us up and shook our windows.  Sounded like an explosion."

"It was so loud, I thought an old growth tree had fallen or something had exploded."

"boom was scary loud, I felt the vibrations in the house and in my body." 

Update on progress on tracking down cause of December 3 boom 

San Juan Islander Editor Sharon Kivisto contacted Whidbey Naval Air Station. Staff said they didn't have any planes flying at that time. The Navy was not conducting any drills involving explosives at that time.  

The San Juan County Emergency Management Department had no idea what caused the sound. 

The Sheriff's Office said they had received one call  and a deputy drove around but did not see anything. 

A check of the seismic activity reports on both the USGS and the Canadian websites did not show any activity for that time. 

According to two people, similar sounds were reported in Victoria, B.C. a few years ago which turned out to be caused by explosions done by industries on the Olympic Peninsula. 

Another person noted that a similar boom was heard when the Mt. St. Helens volcano erupted. 

We will be updating this article when more information if available. 

If you would like to share your observations, please email and use the subject line boom. Thanks. 


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