Hovsgol earthquake 5 December 2014, M W = 4.9: seismic and acoustic effects

Добрынина, А. А.; Sankov, V. A.; Tcydypova, Larisa R.; German, V. I.; Chechelnitsky, Vladimir; Ulzibat, Munkhuu

doi:10.1007/s10950-017-9711-z

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…Global-distance detection of earthquake infrasound for large earthquakes, including both subduction and strike-slip events, has also been widely reported and includes studies of the 1964 Alaska Good Friday earthquake (Young & Greene, 1982), the 2001 M8.1 Kunlunshan China earthquake (Le Pichon et al, 2003), the 2002 M7.9 Alaska Denali earthquake (Olson et al, 2003), the 2003 M8.3 Japan Tokachi-Oki earthquake (Watada et al, 2006), the 2004 M9.0 Indonesia Sumatra earthquake , and the 2011 M9.0 Japan Tohoku Earthquake (Walker et al, 2013). For some of these earthquakes, the infrasound sources were identified as originating at the epicenter as well as from secondary source regions (e.g., Dobrynina et al, 2018;Young & Greene, 1982), including mountain cordilleras, which are thought to preferentially transmit infrasound during the passage of surface waves. Some distal earthquake studies have analyzed recordings from multiple infrasound arrays (e.g., Arrowsmith et al, 2012;Le Pichon et al, 2006;Mutschlecner & Whitaker, 2005).…”

Section: Introductionmentioning

confidence: 99%

Mapping the Sources of Proximal Earthquake Infrasound

Johnson

Mikesell

Anderson

et al. 2020

Geophysical Research Letters

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We recorded a M WR 3.6 earthquake in Idaho (USA) on 7 April 2020 with a network of six three-element infrasound arrays and co-located broadband seismometers situated within 25 km of the hypocenter. Infrasound array processing is used to identify the arrival of seismic-to-atmospheric coupled phases and as much as 90 s of infrasound coda. Apparent velocities ranging from seismic speeds to subhorizontal atmospheric sound speeds are attributed to a superposition of coincident waves arriving at the arrays. We find that the arriving infrasound originates from a broad range of back azimuths that deviates from epicentral back azimuth and indicates the ubiquity of secondary radiators for this relatively small earthquake. Secondary radiators, which often locate in regions of elevated topography, are identified using backprojections and earthquake initiation time. Analysis of infrasound sources from proximal earthquakes can be used to map ground shaking distributions, which are important for assessment of earthquake hazards. Plain Language Summary Earthquakes are known to produce sounds, which encompass frequencies that are both perceptible and below the threshold of human hearing. Low frequency earthquake (infra)sound may be recorded with specialized microphones to understand how earthquakes shake Earth's surface. Our study uses six infrasonic microphone stations to detect and locate sound sources for a magnitude 3.6 earthquake that occurred within 25 km of the stations. The recorded infrasound is produced by ground shaking at both the infrasound stations and also over a wide distribution of areas coinciding with mountain topography. These secondary sources of earthquake sounds occur as seismic waves pass by and the resultant ground shaking perturbs the atmosphere. The identification of infrasound in this study is possible even though the earthquake size is relatively small.

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