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M. Ripepe - One of the best experts on this subject based on the ideXlab platform.
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Evidence of large infrasonic radiation induced by earthquake interaction with alluvial sediments
Seismological Research Letters, 2016Co-Authors: E. Marchetti, G Lacanna, A. Le Pichon, D. Piccinini, M. RipepeAbstract:The M w 5.9 Ferrara earthquake that struck Northern Italy in May, 20 th , 2012, was recorded with an Infrasound array at a source-to-receiver distance of 300 km. The Infrasound record revealed early and late detections characterized by large back-azimuth variations suggesting the existence of an extended area of Infrasound radiation. Unlike most of previous studies, the modeled area of maximum Infrasound radiation appears to mimic an extended flat area (plain of Po river) with no significant contributions from nearby mountain ranges. The shake map of the earthquake and the map of reported acoustic boom is in good agreement with the modeled area of Infrasound radiation suggesting how the transition of seismic waves into acoustic atmospheric waves is efficiently exciting Infrasound recorded at far distances from the source. Such a result is in agreement with the significant seismic amplification within the Po plan alluvial sediments. Infrasound by earthquake interaction with alluvial sediment
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Evidence of Large Infrasonic Radiation Induced by Earthquake Interaction with Alluvial Sediments
Seismological Research Letters, 2016Co-Authors: E. Marchetti, G Lacanna, A. Le Pichon, D. Piccinini, M. RipepeAbstract:The M$_w$ 5.9 Ferrara earthquake that struck northern Italy on 20 May 2012 was recorded with an Infrasound array at a source‐to‐receiver distance of 300 km. The Infrasound record revealed early and late detections characterized by large back‐azimuth variations, suggesting the existence of an extended area of Infrasound radiation. Unlike most previous studies, the modeled area of maximum Infrasound radiation appears to mimic an extended flat area (plain of the Po River) with no significant contributions from nearby mountain ranges. The ShakeMap of the earthquake and the map of the reported acoustic boom are in good agreement with the modeled area of Infrasound radiation, suggesting how the transition of seismic waves into acoustic atmospheric waves is efficiently exciting Infrasound recorded at far distances from the source. Such a result is in agreement with the significant seismic amplification within the Po plain alluvial sediments.
David Fee - One of the best experts on this subject based on the ideXlab platform.
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Volcano Infrasound and the International Monitoring System
Infrasound Monitoring for Atmospheric Studies, 2018Co-Authors: Robin S. Matoza, David N. Green, David Fee, Pierrick MialleAbstract:Volcanoes generate a wide variety of low-frequency (~0.01–20 Hz) acoustic signals, and Infrasound technology is part of an expanding suite of geophysical tools available to characterize, understand, and monitor volcanic processes. We review recent advances in the field of volcano acoustics with an emphasis on scientific and potential civil application gains from the International Monitoring System (IMS) Infrasound network. Energetic Infrasound from explosive volcanism can propagate hundreds to thousands of kilometers in atmospheric waveguides and large explosive eruptions (which represent significant societal and economic hazards) are routinely recorded by the IMS Infrasound network. Significant progress in understanding volcano Infrasound has been made through dedicated local deployments (within
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Automated detection and cataloging of global explosive volcanism using the International Monitoring System Infrasound network
The Journal of the Acoustical Society of America, 2016Co-Authors: Robin S. Matoza, David N. Green, Alexis Le Pichon, David Fee, Peter M. Shearer, Pierrick Mialle, Lars CerannaAbstract:Explosive volcanic eruptions are among the most powerful sources of Infrasound observed on earth, with recordings routinely made at ranges of hundreds to thousands of kilometers. These eruptions can also inject large volumes of ash into heavily traveled aviation corridors, thus posing a significant societal and economic hazard. Detecting and counting the global occurrence of explosive volcanism helps with progress toward several goals in earth sciences and has direct applications in volcanic hazard mitigation. This project aims to build a quantitative catalog of global explosive volcanic activity using the International Monitoring System (IMS) Infrasound network. We are developing methodologies to search systematically through IMS Infrasound array detection bulletins to identify signals of volcanic origin. We combine Infrasound signal association and source location using a brute-force, grid-search, cross-bearings approach. The algorithm corrects for a background prior rate of coherent Infrasound signals ...
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overview of the 2009 and 2011 sayarim Infrasound calibration experiments
Journal of Geophysical Research, 2013Co-Authors: David Fee, Pierrick Mialle, Jeffrey W. Given, John Coyne, Jelle Assink, Roger Waxler, D P Drob, Yefim Gitterman, Milton Garces, Dan KleinertAbstract:[1] Three large-scale Infrasound calibration experiments were conducted in 2009 and 2011 to test the International Monitoring System (IMS) Infrasound network and provide ground truth data for Infrasound propagation studies. Here we provide an overview of the deployment, detonation, atmospheric specifications, Infrasound array observations, and propagation modeling for the experiments. The experiments at the Sayarim Military Range, Israel, had equivalent TNT yields of 96.0, 7.4, and 76.8 t of explosives on 26 August 2009, 24 January 2011, and 26 January 2011, respectively. Successful international collaboration resulted in the deployment of numerous portable Infrasound arrays in the region to supplement the IMS network and increase station density. Infrasound from the detonations is detected out to ~3500 km to the northwest in 2009 and ~6300 km to the northeast in 2011, reflecting the highly anisotropic nature of long-range Infrasound propagation. For 2009, the moderately strong stratospheric wind jet results in a well-predicted set of arrivals at numerous arrays to the west-northwest. A second set of arrivals is also apparent, with low celerities and high frequencies. These arrivals are not predicted by the propagation modeling and result from unresolved atmospheric features. Strong eastward tropospheric winds (up to ~70 m/s) in 2011 produce high-amplitude tropospheric arrivals recorded out to >1000 km to the east. Significant eastward stratospheric winds (up to ~80 m/s) in 2011 generate numerous stratospheric arrivals and permit the long-range detection (i.e., >1000 km). No detections are made in directions opposite the tropospheric and stratospheric wind jets for any of the explosions. Comparison of predicted transmission loss and observed Infrasound arrivals gives qualitative agreement. Propagation modeling for the 2011 experiments predicts lower transmission loss in the direction of the downwind propagation compared to the 2009 experiment, consistent with the greater detection distance. Observations also suggest a more northerly component to the stratospheric winds for the 2009 experiment and less upper atmosphere attenuation. The Sayarim Infrasound calibration experiments clearly demonstrate the complexity and variability of the atmosphere, and underscore the utility of large-scale calibration experiments with dense networks for better understanding Infrasound propagation and detection. Additionally, they provide a rich data set for future scientific research.
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an overview of volcano Infrasound from hawaiian to plinian local to global
Journal of Volcanology and Geothermal Research, 2013Co-Authors: David Fee, Robin S. MatozaAbstract:Abstract Volcano Infrasound is an increasingly useful technique for detecting, locating, characterizing, and quantifying eruptive activity, and can be used to constrain eruption source parameters. In recent years, studies of Infrasound data from active volcanoes have shown clear progress towards mitigating volcanic hazards and understanding volcanic source processes. Volcano acoustic sources are shallow or aerial, thus volcano Infrasound data provide valuable information on eruption dynamics and are readily combined with direct and remote observations of gas, ash, and other eruptive phenomena. The Infrasound signals produced by volcanoes are indicative of the eruption style and dynamics. Here we review the diversity of Infrasound signals generated by a wide variety of volcanic eruptions, from hawaiian to plinian, and the physical processes inferred to produce them. We place particular emphasis on regional (15–250 km distance) and global (> 250 km distance) volcano Infrasound studies, as recent work in this area has made significant advances in monitoring and characterizing remote and difficult-to-monitor eruptions. Long-range infrasonic detection of explosive volcanic eruptions is possible due to the energetic source mechanisms involved, minor atmospheric attenuation at low frequencies, and the existence of waveguides in the atmosphere. However, accurate characterization of the atmosphere and its spatiotemporal variability is required for reliable long-range sound propagation modeling and correct interpretation of global Infrasound recordings. Conversely, because volcanic explosions are energetic and sometimes repetitive Infrasound sources, they can be used to validate atmospheric and acoustic propagation models.
Maurizio Ripepe - One of the best experts on this subject based on the ideXlab platform.
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Volcano Infrasound: A review
Journal of Volcanology and Geothermal Research, 2011Co-Authors: Jeffrey B. Johnson, Maurizio RipepeAbstract:Abstract Exploding volcanoes, which produce intense Infrasound, are reminiscent of the veritable explosion of volcano Infrasound papers published during the last decade. Volcano Infrasound is effective for tracking and quantifying eruptive phenomena because it corresponds to activity occurring near and around the volcanic vent, as opposed to seismic signals, which are generated by both surface and internal volcanic processes. As with seismology, Infrasound can be recorded remotely, during inclement weather, or in the dark to provide a continuous record of a volcano's unrest. Moreover, it can also be exploited at regional or global distances, where seismic monitoring has limited efficacy. This paper provides a literature overview of the current state of the field and summarizes applications of Infrasound as a tool for better understanding volcanic activity. Many Infrasound studies have focused on integration with other geophysical data, including seismic, thermal, electromagnetic radiation, and gas spectroscopy and they have generally improved our understanding of eruption dynamics. Other work has incorporated Infrasound into volcano surveillance to enhance capabilities for monitoring hazardous volcanoes and reducing risk. This paper aims to provide an overview of volcano airwave studies (from analog microbarometer to modern pressure transducer) and summarizes how Infrasound is currently used to infer eruption dynamics. It also outlines the relative merits of local and regional Infrasound surveillance, highlights differences between array and network sensor topologies, and concludes with mention of sensor technologies appropriate for volcano Infrasound study.
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Infrasound detections and calibration experiments
2010Co-Authors: Paola Campus, Maurizio Ripepe, Emanuele Marchetti, Alexis Lepichon, Julien VergozAbstract:The development of Infrasound research experienced a significant revival about 10 years ago thanks to the first steps made at that time for the establishment of the International Monitoring System Infrasound network in the framework of the Comprehensive Test-Ban Treaty activities. The IMS Infrasound network, which, as of today, counts 42 operational stations (i.e. the 70% of the network) has provided the Infrasound community with an amount of information about natural and man-made sources without precedent. In parallel, several research groups around the world have developed projects to establish local Infrasound networks which have been instrumental for the observation of events recorded at local and regional distances and have complemented, several times, the information retrieved through the IMS Infrasound network. The Infrasound research groups in Europe have been particularly active in the last years and, acting in close collaboration with CTBTO, have significantly contributed to the progress in understanding the generation and propagation of Infrasound waves through the atmosphere, using both permanent and portable Infrasound arrays.
Robin S. Matoza - One of the best experts on this subject based on the ideXlab platform.
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Volcano Infrasound and the International Monitoring System
Infrasound Monitoring for Atmospheric Studies, 2018Co-Authors: Robin S. Matoza, David N. Green, David Fee, Pierrick MialleAbstract:Volcanoes generate a wide variety of low-frequency (~0.01–20 Hz) acoustic signals, and Infrasound technology is part of an expanding suite of geophysical tools available to characterize, understand, and monitor volcanic processes. We review recent advances in the field of volcano acoustics with an emphasis on scientific and potential civil application gains from the International Monitoring System (IMS) Infrasound network. Energetic Infrasound from explosive volcanism can propagate hundreds to thousands of kilometers in atmospheric waveguides and large explosive eruptions (which represent significant societal and economic hazards) are routinely recorded by the IMS Infrasound network. Significant progress in understanding volcano Infrasound has been made through dedicated local deployments (within
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Automated detection and cataloging of global explosive volcanism using the International Monitoring System Infrasound network
The Journal of the Acoustical Society of America, 2016Co-Authors: Robin S. Matoza, David N. Green, Alexis Le Pichon, David Fee, Peter M. Shearer, Pierrick Mialle, Lars CerannaAbstract:Explosive volcanic eruptions are among the most powerful sources of Infrasound observed on earth, with recordings routinely made at ranges of hundreds to thousands of kilometers. These eruptions can also inject large volumes of ash into heavily traveled aviation corridors, thus posing a significant societal and economic hazard. Detecting and counting the global occurrence of explosive volcanism helps with progress toward several goals in earth sciences and has direct applications in volcanic hazard mitigation. This project aims to build a quantitative catalog of global explosive volcanic activity using the International Monitoring System (IMS) Infrasound network. We are developing methodologies to search systematically through IMS Infrasound array detection bulletins to identify signals of volcanic origin. We combine Infrasound signal association and source location using a brute-force, grid-search, cross-bearings approach. The algorithm corrects for a background prior rate of coherent Infrasound signals ...
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an overview of volcano Infrasound from hawaiian to plinian local to global
Journal of Volcanology and Geothermal Research, 2013Co-Authors: David Fee, Robin S. MatozaAbstract:Abstract Volcano Infrasound is an increasingly useful technique for detecting, locating, characterizing, and quantifying eruptive activity, and can be used to constrain eruption source parameters. In recent years, studies of Infrasound data from active volcanoes have shown clear progress towards mitigating volcanic hazards and understanding volcanic source processes. Volcano acoustic sources are shallow or aerial, thus volcano Infrasound data provide valuable information on eruption dynamics and are readily combined with direct and remote observations of gas, ash, and other eruptive phenomena. The Infrasound signals produced by volcanoes are indicative of the eruption style and dynamics. Here we review the diversity of Infrasound signals generated by a wide variety of volcanic eruptions, from hawaiian to plinian, and the physical processes inferred to produce them. We place particular emphasis on regional (15–250 km distance) and global (> 250 km distance) volcano Infrasound studies, as recent work in this area has made significant advances in monitoring and characterizing remote and difficult-to-monitor eruptions. Long-range infrasonic detection of explosive volcanic eruptions is possible due to the energetic source mechanisms involved, minor atmospheric attenuation at low frequencies, and the existence of waveguides in the atmosphere. However, accurate characterization of the atmosphere and its spatiotemporal variability is required for reliable long-range sound propagation modeling and correct interpretation of global Infrasound recordings. Conversely, because volcanic explosions are energetic and sometimes repetitive Infrasound sources, they can be used to validate atmospheric and acoustic propagation models.
Keith J Petrie - One of the best experts on this subject based on the ideXlab platform.
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can expectations produce symptoms from Infrasound associated with wind turbines
Health Psychology, 2014Co-Authors: Fiona Crichton, George Dodd, Gian Schmid, Greg D Gamble, Keith J PetrieAbstract:Objective:The development of new wind farms in many parts of the world has been thwarted by public concern that subaudible sound (Infrasound) generated by wind turbines causes adverse health effects. Although the scientific evidence does not support a direct pathophysiological link between Infrasound and health complaints, there is a body of lay information suggesting a link between Infrasound exposure and health effects. This study tested the potential for such information to create symptom expectations, thereby providing a possible pathway for symptom reporting.Method:A sham-controlled double-blind provocation study, in which participants were exposed to 10 min of Infrasound and 10 min of sham Infrasound, was conducted. Fifty-four participants were randomized to high- or low-expectancy groups and presented audiovisual information, integrating material from the Internet, designed to invoke either high or low expectations that exposure to Infrasound causes specified symptoms.Results:Highexpectancy participants reported significant increases, from preexposure assessment, in the number and intensity of symptoms experienced during exposure to both Infrasound and sham Infrasound. There were no symptomatic changes in the low-expectancy group.Conclusions:Healthy volunteers, when given information about the expected physiological effect of Infrasound, reported symptoms that aligned with that information, during exposure to both Infrasound and sham Infrasound. Symptom expectations were created by viewing information readily available on the Internet, indicating the potential for symptom expectations to be created outside of the laboratory, in real world settings. Results suggest psychological expectations could explain the link between wind turbine exposure and health complaints.