Measuring Infrasound from the Maritime Environment

Grimmett, Doug; Plate, Randall; Goad, Jason

doi:10.1007/978-3-319-75140-5_5

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…Decoupling the sensors from the ocean surface is key, as this removes the pervasive wave‐heave noise reported in Grimmett et al. (2019).…”

Section: Albatrosses As Infrasound Sensor Platformsmentioning

confidence: 99%

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Airborne Infrasound Makes a Splash

Bowman

2021

Geophysical Research Letters

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Acoustic waves can travel vast distances in planetary atmospheres. These waves convey information both on the source that generated them as well as the properties of the medium they travel through. On Earth, these acoustic waves typically fall in the "infrasound" range (<20 Hz, the lower limit of human hearing), since higher frequency waves attenuate more quickly. Infrasound waves can circle the globe multiple times given a powerful enough source (Le Pichon et al., 2013;Symons, 1888).A variety of natural and anthropogenic phenomena gives rise to infrasound. Discrete natural events such as bolide airbursts (Ens et al., 2012;Silber et al., 2009), large earthquakes (Le Pichon et al., 2005;Shani-Kadmiel et al., 2021), and volcanic eruptions (Fee & Matoza, 2013) create signals that can travel over regional to global scales. Other activity such as colliding ocean waves (the "ocean microbarom") (Waxler & Gilbert, 2006), wind blowing over mountains (Bedard, 1978;Walterscheid & Hickey, 2005), and severe storms (Goerke & Woodward, 1966) can create long duration signals that comprise much of the Earth's infrasonic background at low frequencies. Regional to local infrasound (and occasionally audible emissions) have been reported from small earthquakes (

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“…Decoupling the sensors from the ocean surface is key, as this removes the pervasive wave‐heave noise reported in Grimmett et al. (2019).…”

Section: Albatrosses As Infrasound Sensor Platformsmentioning

confidence: 99%

“…This demonstration of far field infrasound recording above the open ocean is a major advance, because it opens vast regions of the planet to acoustic monitoring. Decoupling the sensors from the ocean surface is key, as this removes the pervasive wave-heave noise reported in Grimmett et al (2019).…”

Section: Albatrosses As Infrasound Sensor Platformsmentioning

confidence: 99%

Airborne Infrasound Makes a Splash

Bowman

2021

Geophysical Research Letters

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The INFRA-EAR: a low-cost mobile multidisciplinary measurement platform for monitoring geophysical parameters

et al. 2021

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Abstract. Geophysical studies and real-time monitoring of natural hazards, such as volcanic eruptions or severe weather events, benefit from the joint analysis of multiple geophysical parameters. However, typical geophysical measurement platforms still provide logging solutions for a single parameter, due to different community standards and the higher cost per added sensor. In this work, the Infrasound and Environmental Atmospheric data Recorder (INFRA-EAR) is presented, which has been designed as a low-cost mobile multidisciplinary measurement platform for geophysical monitoring. In particular, the platform monitors infrasound but concurrently measures barometric pressure, accelerations, and wind flow and uses the Global Positioning System (GPS) to position the platform. Due to its digital design, the sensor platform can be readily integrated with existing geophysical data infrastructures and be embedded in geophysical data analysis. The small dimensions and low cost per unit allow for unconventional, experimental designs, for example, high-density spatial sampling or deployment on moving measurement platforms. Moreover, such deployments can complement existing high-fidelity geophysical sensor networks. The platform is designed using digital micro-electromechanical system (MEMS) sensors embedded on a printed circuit board (PCB). The MEMS sensors on the PCB are a GPS, a three-component accelerometer, a barometric pressure sensor, an anemometer, and a differential pressure sensor. A programmable microcontroller unit controls the sampling frequency of the sensors and data storage. A waterproof casing is used to protect the mobile platform against the weather. The casing is created with a stereolithography (SLA) Formlabs 3D printer using durable resin. Thanks to low power consumption (9 Wh over 25 d), the system can be powered by a battery or solar panel. Besides the description of the platform design, we discuss the calibration and performance of the individual sensors.

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Measuring Infrasound from the Maritime Environment

Cited by 2 publications

References 24 publications

Airborne Infrasound Makes a Splash

Airborne Infrasound Makes a Splash

The INFRA-EAR: a low-cost mobile multidisciplinary measurement platform for monitoring geophysical parameters

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