Super Typhoon Bopha

Over the coming weeks and months, we will be sharing data products from our Super Typhoon Bopha data set. Bopha began as a tropical storm east of our array in Palau, and intensified as it narrowly missed Palau on its way to the Philippines. ISLA staff were recently in Palau to upgrade an IMS infrasound station (International Monitoring System). The last of the field crew, (including yours truly) completed the work and left just 2 days before the arrival of Typhoon Bopha. We will be presenting products from this exciting data set recorded with our newly upgraded system.

More information on the array

This is the first of our data products. This audio file is 24 hrs of data from 00:00:00 UTC on December 2, 2012. It has been sped up by a factor of 2200 resulting in a ~39 second clip.



From 0-10 seconds you can hear the typhoon approach the island
Around 12 seconds, signal from the high period surf becomes noticeable
Around 30 seconds, signal from long period surf becomes noticeable

We recommend playing this track several times, and using different EQ settings. We have been having fun playing it on different systems with different frequency responses.

For those interested in waveforms, this signal has been band-pass filtered from 40Hz to 6kHz after being sped up by a factor of 2200. This maps the 0.2 Hz microbarom (ocean storm) peak to 440Hz (a concert A).

ALOHA video Fridays: Surf infrasound part 9

Aloha! This is the 9th video in a series of 9 on surf infrasound. 

Enjoy, and have an excellent weekend!Dr. Milton Garces presents the conclusions derived from the series of surf infrasound experiments.

Closing credits for the surf infrasound documentary. Grinding surfing footage from one of the smaller days of our experiment in Kauai.

ALOHA video Fridays: Surf infrasound part 8

Aloha! This is the 8th video in a series of 9 on surf infrasound. 

Enjoy, and have an excellent weekend!Dr. Milton Garces describes the surf infrasound deployment at Temae Beach, Moorea, French Polynesia.

ALOHA video Fridays: Surf infrasound part 7

Aloha! This is the 7th video in a series of 9 on surf infrasound. 

Enjoy, and have an excellent weekend!Dr. Milton Garces describes the surf infrasound deployment at Polihale Beach, Kauai. We captured the infrasound from a massive swell, with 40ft peeling waves!

ALOHA video Fridays: Surf infrasound part 6

Aloha! This is the 6th video in a series of 9 on surf infrasound. 

Enjoy, and have an excellent weekend!Dr. Milton Garces describes a surf infrasound experiment at Makalawena Beach, Hawaii.

ALOHA video Fridays: Surf infrasound part 5

Aloha! This is the 5th video in a series of 9 on surf infrasound.

Enjoy, and have an excellent weekend!

Dr. Milton Garces explains the sonification of infrasound. The surf sounds on this clip get deeper, crossing over to the inaudible.

ALOHA video Fridays: Surf infrasound part 4

Aloha! This is the fourth video in a series of 9 on surf infrasound. 

Enjoy, and have an excellent weekend! Dr. Milton Garces describes some of the advantages of using infrasound arrays.

ALOHA video Fridays: Surf infrasound part 3

Aloha! This is the third video in a series of 9 on surf infrasound. 

 Enjoy, and have an excellent weekend!

  Dr. Milton Garces outlines possible source processes for surf infrasound.

ALOHA video Fridays: Surf infrasound part 2

Aloha! This is the second video in a series of 9 on surf infrasound. 

Enjoy, and have an excellent weekend!

Dr. Milton Garces discusses the infrasonic signature of individual breaking ocean waves.

ALOHA video Fridays: Surf infrasound part 1

Aloha! This is the first video in a series of 9 on surf infrasound.

Enjoy, and have an excellent weekend!

 

Welcome to the world of infrasound! Volcanoes, severe weather, tsunamis, meteors, earthquakes, and all large things that blow up can produce inaudible atmospheric sound, which can be recorded by a global microphone network. In this clip, Dr. Milton Garces introduces low-frequency acoustics as background to surf infrasound studies.