منابع مشابه
A portable infrasound generator.
The rotary subwoofer is a novel low frequency transducer capable of efficiently generating infrasound from a compact source. A field-deployable version of this device may find application as a calibration source for infrasound arrays of the International Monitoring System (IMS) [(2001). The Global Verification Regime and the International Monitoring System (CTBTO Preparatory Commission Vienna I...
متن کاملUltrafast partial measurement of fourth-order coherence by HBT interferometry of upconversion-based autocorrelation.
We introduce, analyze, and experimentally demonstrate a compact semiconductor-based scheme for a femtosecond-scale partial fourth-order coherence g((4)) measurements. The scheme is based on a start-stop photon-counting Hanbury Brown and Twiss (HBT) interferometry of an upconversion-based Michelson-interferometer autocorrelation. The experimental realization employs second-harmonic generation in...
متن کاملHuman Effects of Infrasound
The risk for hearing impairments due to infrasonic exposures at normally occurring sound pressure levels is low. In cases where hearing impairment has been shown, it has often been of a short-term nature, lasting for less than one hour. Unpleasant experiences of pressure in the middle ear are often mentioned in connection with exposure to infrasound. The effect can be explained as an increased ...
متن کاملDetecting Geyser Activity with Infrasound
We monitored geyser activity in the Lower Geyser Basin (LGB) of Yellowstone National Park with dual four-element microphone arrays separated by ~600 m. The arrays were independently used to identify incident coherent plane wave energy, then conjoint cross beam back-azimuths from the two arrays were used to precisely locate signal sources. During a week in August 2011 we located repeating infras...
متن کاملInfrasound as a Depth Discriminant
There is a need for routine measurements of infrasound from earthquakes, in conjunction with modeling, to better constrain our understanding of the generation of infrasound from earthquakes, in particular the effect of source depth. Here, we first outline a systematic search for infrasound from earthquakes from a range of magnitudes. Based on our observations, earthquakes with Mw>~5 appear to b...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 2021
ISSN: 2169-9313,2169-9356
DOI: 10.1029/2020jb020513