Kona Infrasound Event 140717

UPDATE: Event report is up on the ISLA blog page (this page is under development at the moment but we are trying to get all our event reports posted as we write them)

At 4:00 pm HST a loud noise was heard in the Kahalu-Keauhou area of Kona on the Big Island.

ISLA has received three accounts that are as follows:

1)  "a big bang that shook the ground"

2) "HUGE BANG that scared all the animals followed by jet noise. It sounded like it was right overhead" - Donkey Mill Area

3) "It was super loud. Right over Kahalu'u. I think it was a jet. It was so loud. I talked to people at kta and they said the whole building shook" - Kahalu'u beach park area

The signal was recorded at IMS station I59US in Kona. Array processing was done to determine the back azimuth of the signal.

Final back azimuth as calculated using PMCC4.15, which crosses the coast at Kahalu'u Beach Park

direction of the signal as calculated using array processing

The signal as recorded at station I59US 

This post will be updated later with any new information and more detailed analysis. Any other observations from witnesses are appreciated! Hopefully by the time of the next update the source will be known.