""Radon anomalies are commonly observed prior to. dynamic failure in the crust and are interpreted as cracking. of the medium, thus attracting considerable attention in. understanding the precursory phenomena of earthquakes. and volcanic activity. In this study we have compared the. starting radon emissions from low porosity crystalline lava. (phonolite) samples with those from damaged and failed. samples. The damaged sample was loaded up to just beyond. the end of the linear elastic phase, as evidenced by the output. of AE energy, the increase in total porosity and a. decrease in P‐wave and S‐wave velocity relative to the. intact sample. Whereas, the failed sample showed deformation. behaviour characteristically brittle with increasing. values of AE output and porosity as the sample approached. macroscopic failure. Radon measurements have evidenced. that dilatational microcracking of deformed sample produced. no significant variation in radon emanation with. respect to the intact sample. In contrast, after macroscopic. failure, radon emanation drastically increased. Therefore,. major finding from this study is that, in the case of low. porosity and relatively high strength crystalline lavas, the. development of a macroscopic fracture provides new large. exhaling surface resulting in a substantial increase in radon. emission rate""

Mollo, S., Tuccimei, P., Heap, M.j., Vinciguerra, S., Soligo, M., Castelluccio, M., et al. (2011). Increase in radon emission due to rock failure. An experimental study. GEOPHYSICAL RESEARCH LETTERS, 38(L14304) [10.1029/2011GL047962.].

Increase in radon emission due to rock failure. An experimental study.

TUCCIMEI, Paola;SOLIGO, Michele;
2011-01-01

Abstract

""Radon anomalies are commonly observed prior to. dynamic failure in the crust and are interpreted as cracking. of the medium, thus attracting considerable attention in. understanding the precursory phenomena of earthquakes. and volcanic activity. In this study we have compared the. starting radon emissions from low porosity crystalline lava. (phonolite) samples with those from damaged and failed. samples. The damaged sample was loaded up to just beyond. the end of the linear elastic phase, as evidenced by the output. of AE energy, the increase in total porosity and a. decrease in P‐wave and S‐wave velocity relative to the. intact sample. Whereas, the failed sample showed deformation. behaviour characteristically brittle with increasing. values of AE output and porosity as the sample approached. macroscopic failure. Radon measurements have evidenced. that dilatational microcracking of deformed sample produced. no significant variation in radon emanation with. respect to the intact sample. In contrast, after macroscopic. failure, radon emanation drastically increased. Therefore,. major finding from this study is that, in the case of low. porosity and relatively high strength crystalline lavas, the. development of a macroscopic fracture provides new large. exhaling surface resulting in a substantial increase in radon. emission rate""
Mollo, S., Tuccimei, P., Heap, M.j., Vinciguerra, S., Soligo, M., Castelluccio, M., et al. (2011). Increase in radon emission due to rock failure. An experimental study. GEOPHYSICAL RESEARCH LETTERS, 38(L14304) [10.1029/2011GL047962.].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/278697
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