Overview of the hydroacoustic monitoring system for the Comprehensive Nuclear-Test-Ban Treaty

Lawrence, Martin W.

doi:10.1121/1.424948

Cited by 6 publications

(6 citation statements)

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“…Lawrence 1999). In this framework, it is rapidly becoming impossible to fully catalogue all observations of cryosignals, and the present paper has no pretence of completeness in this respect.…”

Section: Data Setmentioning

confidence: 93%

“…Since our initial identification of cryosignals in Paper I, a large number of additional observations have been reported Pulli et al 2004;Chapp et al 2004), using both land-based seismographs and the new hydrophone stations currently being de-ployed as part of the International Monitoring System of the Comprehensive Nuclear-Test Ban Treaty (e.g. Lawrence 1999). In this framework, it is rapidly becoming impossible to fully catalogue all observations of cryosignals, and the present paper has no pretence of completeness in this respect.…”

Section: Data Setmentioning

confidence: 98%

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Hydroacoustic signals generated by parked and drifting icebergs in the Southern Indian and Pacific Oceans

Talandier

Hyvernaud

Reymond

et al. 2006

Geophysical Journal International

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SUMMARY We report the detection, principally by the French Polynesian seismic network, of hydroacoustic signals generated inside large icebergs, either ‘parked’ along the Wilkes coast of Antarctica in the Indian Ocean, or drifting in the Southern Pacific Ocean between latitudes of 55° and 65°S, during the years 2002–2004. The signals can be classified into two very broad families, based on the nature of their spectra. A first group features prominently monochromatic signals, whose frequency can, however, fluctuate with time during a single sequence of emission (typically lasting a few to a few tens of minutes). Such signals are generally reminiscent of those detected in 2000 in the Ross Sea and are generated principally in the Indian Ocean ‘iceberg parking lot’, between longitudes 144°E and 156°E. A new family of signals features a much broader spectrum, superimposed on a number of preferential frequencies suggesting the background activation of a number of resonators; these signals occur both in the parking lot and in the Southern Pacific. Further variations in spectra are documented inside each family. On the basis of similar in situ observations on Ross Sea icebergs under project SOUTHBERG, the first family is generally interpreted as expressing a stick‐and‐slip process during collisions between large iceberg masses. The second family of signals are observed during exceptional episodes of the otherwise silent drift of the icebergs in the deep Pacific Basin, some of which correlate with their passage over the various fronts defining the oceanographic southern convergence zone. Finally, a most recent episode of activity, generally similar to the above first family, was detected on 2004 December 3–4, at the ocean entry of the Dibble Ice Tongue, 600 km west of the parking lot along the coast of Antarctica. It is interpreted as resulting from collisions between large drifting icebergs and fragments of the ice tongue calved off during its disintegration, as documented by satellite imagery.

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Section: Data Setmentioning

confidence: 93%

Section: Data Setmentioning

confidence: 98%

Hydroacoustic signals generated by parked and drifting icebergs in the Southern Indian and Pacific Oceans

Talandier

Hyvernaud

Reymond

et al. 2006

Geophysical Journal International

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“…The CTBT verification regime relies in part on the International Monitoring System (IMS), a global network of facilities to detect nuclear explosions. Seismic (Kvaerna and Ringdal, 2013), hydroacoustic (Lawrence, 1999), infrasound (Green and Bowers, 2010), and radio-nuclide verification (Schoeppner, 2017) technologies comprise the IMS and are distributed across 337 stations and laboratories to moni-tor for nuclear explosions conducted on Earth (CTBTO, 2018). Currently, the most sensitive means for detecting underground nuclear explosions are seismic, which can detect and identify explosions down to or below a yield of about 1 kiloton worldwide.…”

Section: A Existing Approachesmentioning

confidence: 99%

Colloquium : Neutrino detectors as tools for nuclear security

et al. 2020

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For over 40 years, physicists have considered possible uses for neutrino detectors in nuclear nonproliferation, arms control, and fissile materials security. Neutrinos are an attractive fission signature because they readily pass through matter. The same property makes neutrinos challenging to detect in systems that would be practical for nuclear security applications. This colloquium presents a broad overview of several potential neutrino applications, including the near-field monitoring of known reactors, far-field monitoring of known or discovery of undeclared reactors, detection of reactor waste streams, and detection of nuclear explosions. We conclude that recent detector advances have made near-field monitoring feasible. Farther-field reactor detection and waste stream detection monitoring are possible in some cases with further research and development. Very long-range reactor monitoring and nuclear explosion detection do not appear feasible for the foreseeable future due to considerable physical and/or practical constraints.

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“…In this paper, we investigate the feasibility of localization of Antarctic ice breaking events by a single hydroacoustic station of the hydroacoustic network deployed in the Indian Ocean as part of the International Monitoring System (IMS) the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Data from the HA01 station located about 150 km north-west of Cape Leeuwin in Western Australia [1] are used for analysis. Based on bearing estimation at hydroacoustic stations [2], as well as the signal travel times expected from an acoustic propagation model, the sources of underwater noise can be located using hydroacoustic International Monitoring System (IMS) network, providing the signals are detected by more than one hydroacoustic station with a high signal-to-noise-ratio.…”

Section: Introductionmentioning

confidence: 99%

Localization of Antarctic ice breaking events by frequency dispersion of the signals received at a single hydroacoustic station in the Indian Ocean

Gavrilov

2008

The Journal of the Acoustical Society of America

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Transient acoustic signals from Antarctic ice cracking and breaking events, featuring significant frequency dispersion, were observed at the hydroacoustic stations deployed in the Indian Ocean as part of the International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty. Based on a comparison with numerical predictions, the measured dispersion characteristics were used to estimate the range between ice events and the receiver. Combined with the bearing capability of the IMS stations, these estimates allow us to locate ice events from a single hydroacoustic station. An analysis of range estimation errors due to uncertainty of the measured time-frequency structure of signal arrivals and due to variations of the sound speed profiles was also conducted. The analysis showed that, for the typical ice events, the location accuracy from a single hydroacoustic station was of the same order, as that determined from an intersection of bearings from two remote stations. This localization method was examined by analyzing an ice event detected at both the Cape Leeuwin IMS station and a sea noise logger deployed off the Antarctic shelf.

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Overview of the hydroacoustic monitoring system for the Comprehensive Nuclear-Test-Ban Treaty

Cited by 6 publications

References 0 publications

Hydroacoustic signals generated by parked and drifting icebergs in the Southern Indian and Pacific Oceans

Hydroacoustic signals generated by parked and drifting icebergs in the Southern Indian and Pacific Oceans

Colloquium : Neutrino detectors as tools for nuclear security

Localization of Antarctic ice breaking events by frequency dispersion of the signals received at a single hydroacoustic station in the Indian Ocean

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