Publication Date:
2019
Description:
〈p〉Publication date: 15 October 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Journal of Volcanology and Geothermal Research, Volume 384〈/p〉
〈p〉Author(s): Chiou Ting Tan, Benoît Taisne, Jurgen Neuberg, Ahmad Basuki〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉Magma opening new fluid pathways through the crust can generate migrating seismic sources following the trail of the magma. By using Seismic Amplitude Ratio Analysis (SARA), it is possible to detect this seismic migration simply from the amplitudes of continuous data recorded at different stations in a network, without having to do any picking of seismic phases. In this study, we present a modified method – Red-flag SARA, which adapts SARA for real-time monitoring. Red-flag SARA provides a quantitative tool to analyse amplitude ratios between stations in a network and detect temporal changes in these ratios. Since such changes imply seismic source location variations, Red-flag SARA is a handy tool during seismic crises to quickly answer the question of whether seismic activity, and therefore magma, is migrating or not. We tested Red-flag SARA on synthetic data and validated it using real data from two volcanoes – Piton de la Fournaise, Reunion Island, and Gede, Indonesia, for three scenarios: 1) magma migration ending as intrusion, 2) migration leading to eruption and 3) a burst of seismicity with no magma migration.〈/p〉〈/div〉
〈/div〉
Print ISSN:
0377-0273
Electronic ISSN:
1872-6097
Topics:
Geosciences
