Monte Carlo simulation for background study of geophysical inspection with cosmic-ray muons

Nishiyama, Ryuichi; Taketa, A.; Miyamoto, Seigo; Kasahara, K.

doi:10.1093/gji/ggw191

Cited by 52 publications

(62 citation statements)

References 38 publications

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“…Gailler et al [2013] estimate the average density of the La Soufrière complex to be 1.8 g cm −3 based on regional gravity surveys. A low average density is thus not surprising; however, we also point out the existence of a diffusive flux of muons, which can bias the estimated density toward lower values [Nishiyama et al, 2014[Nishiyama et al, , 2016. This phenomenon is currently being studied with dedicated simulations, which show that in the case of La Soufrière it can effectively shift the inferred densities to lower values.…”

Section: Data Acquisition and Processingmentioning

confidence: 62%

“…Indeed, using a new analysis of data from the last (1976) phreatic eruption [cf. A low average density is thus not surprising; however, we also point out the existence of a diffusive flux of muons, which can bias the estimated density toward lower values [Nishiyama et al, 2014[Nishiyama et al, , 2016. This large amount of nonmagmatic material implies that an extensive volume of the dome is highly altered and that large cavities prevail.…”

Section: Data Acquisition and Processingmentioning

confidence: 63%

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Three‐dimensional density structure of La Soufrière de Guadeloupe lava dome from simultaneous muon radiographies and gravity data

Rosas‐Carbajal

Jourde

Marteau

et al. 2017

Geophysical Research Letters

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Muon imaging has recently emerged as a powerful method to complement standard geophysical tools in the understanding of the Earth's subsurface. Muon measurements yield a “radiography” of the average density along the muon path, allowing to image large volumes of a geological body from a single observation point. Here we jointly invert muon data from three simultaneous telescope acquisitions together with gravity data to estimate the three‐dimensional density structure of the La Soufrière de Guadeloupe lava dome. Our unique data set allows us to achieve an unprecedented spatial resolution with this novel technique. The retrieved density model reveals an extensive, low‐density anomaly where the most active part of the volcanic hydrothermal system is located, supporting previous studies that indicate this region as the most likely to be involved in a partial edifice collapse.

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Section: Data Acquisition and Processingmentioning

confidence: 62%

Section: Data Acquisition and Processingmentioning

confidence: 63%

Three‐dimensional density structure of La Soufrière de Guadeloupe lava dome from simultaneous muon radiographies and gravity data

Rosas‐Carbajal

Jourde

Marteau

et al. 2017

Geophysical Research Letters

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“…Each tracker consists of at least five MWPCs and five 2‐cm‐thick lead shielding plates. These plates are applied to deflect and absorb the low‐energy (<1 GeV) muons (Oláh et al, ) and electrons (Oláh & Varga, ) that do not penetrate the volcano but appear to come from that direction (Nishiyama et al, ; Ambrosino et al, ). This measurement setting covers the crater region (Figure a) and allows a spatial resolution of less than 10 m at a position of the Minamidake crater rim.…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

Plug Formation Imaged Beneath the Active Craters of Sakurajima Volcano With Muography

Oláh

Tanaka

Ohminato

et al. 2019

Geophysical Research Letters

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Sakurajima Muography Observatory captured the formation of a volcanic plug beneath the Showa crater with a spatial resolution of ∼60 m in accordance with the end of the eruption episode of Showa crater and the reactivation of Minamidake crater. The increase of average density was observed with above 3 σ standard deviation for both above the floor of Minamidake crater and beneath the floor of Showa crater, respectively, being interpreted as volcanic ejecta deposition and the formation of a volcanic plug laterally extended within a few hundreds of meters.

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“…In Ref. [5], the energy cut of about 1 GeV was suggested for particle detectors to suppress background particles. The nature of background depends on the locations of the target of interest and the particle detector [5].…”

Section: Introductionmentioning

confidence: 99%

“…[5], the energy cut of about 1 GeV was suggested for particle detectors to suppress background particles. The nature of background depends on the locations of the target of interest and the particle detector [5]. The study of the background of muograpic observations requires a dedicated simulation framework which produces correlated cosmic particle showers, as well as the investigated object and the particle detectors can be implemented into its framework.…”

Section: Introductionmentioning

confidence: 99%

Investigation of background sources of muography

Oláh¹,

Tanaka²,

Varga³

2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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Muography is a technique for the imaging of the interior of large size objects, such as volcanoes, mountains, with the measurement of the flux of high energy cosmic muons. The electrons/positrons, high energy hadrons and low energy muons can contaminate the muon signal. These background sources require a good understanding of the creation processes, as well as reliable simulation frameworks with high predictive power. A simulation framework based on GEANT4 has been established to pin down the key features of the background particles. The particle spectra and ratios have been compared to existing other measurements as well as other simulation programs. The correlation between simultaneously arriving particles have also been quantitatively investigated, demonstrating that electrons and positrons tend to arrive close to each other and with low relative angle. This feature, which is highly relevant for counting detectors, has been experimentally verified at shallow depth underground and under open sky using the new variant of MWPC detectors. A low-noise MWPC-based tracking detector (Muographic Observation System, mMOS) has been installed at the Sakurajima volcano. The report on the detector performance and the verification of the applicability of mMOS for long-range muography will be presented.

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Monte Carlo simulation for background study of geophysical inspection with cosmic-ray muons

Cited by 52 publications

References 38 publications

Three‐dimensional density structure of La Soufrière de Guadeloupe lava dome from simultaneous muon radiographies and gravity data

Three‐dimensional density structure of La Soufrière de Guadeloupe lava dome from simultaneous muon radiographies and gravity data

Plug Formation Imaged Beneath the Active Craters of Sakurajima Volcano With Muography

Investigation of background sources of muography

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