GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.3 ______ ___ GNGTS 2023 Figure 2. DAS epicentral locations and their uncertainties compared with independent locations. Orange dots are used to plot the samples from the posterior probability density (PPDs) functions, while orange stars represent the mean solutions and red stars the independent locations. A) The event location obtained from automatic arrival time picking reproduces satisfactorily the reference one, for the event recorded by GRÍMSVÖTN, given the low epicentral gap. B) SYNTH-01 test for NESTOR DAS array shows a high longitudinal uncertainty, given the quasi-linear north-south geometry. C) SYNTH-04 test for RHONEGLETSCHER array shows that, if coupling effects on traveltimes are considered, the synthetic location can partially reconstruct the D) calculated location. References Ajo-Franklin, J. B., Dou, S., Lindsey, N. J., Monga, I., Tracy, C., Robertson, M., ... others (2019). Distributed acoustic sensing using dark fiber for near-surface characterization and broadband seismic event detection. Scientific reports, 9(1), 1–14. Baer, M., & Kradolfer, U. (1987). An automatic phase picker for local and teleseismic events. Bulletin of the Seismological Society of America, 77(4), 1437–1445. Biondi, B., Martin, E., Cole, S., Karrenbach, M., & Lindsey, N. (2017, September). Earthquakes analysis using data recorded by the Stanford DAS array. In 2017 SEG International Exposition and Annual Meeting. OnePetro. Biondi B., S. Yuan, E.R. Martin, F. Huot, R.G. Clapp, (2022), Using telecommunication fiber infrastructure for earthquake monitoring and near-surface characterization, AGU Monograph “Distributed Acoustic Sensing in Geophysics: Methods and Applications”, ISBN: 978-1-119-52179- Fichtner, A., Klaasen, S., Thrastarson, S., Çubuk‐Sabuncu, Y., Paitz, P., & Jónsdóttir, K. (2022). Fiber‐Optic Observation of Volcanic Tremor through Floating Ice Sheet Resonance. The Seismic Record, 2(3), 148-155. Jousset, P., Reinsch, T., Ryberg, T., Blanck, H., Clarke, A., Aghayev, R., ... Krawczyk, C. M. (2018). Dynamic strain determination using fibre-optic cables allows imaging of seismological and structural features. Nature communications, 9(1), 1–11. Karrenbach, M., Cole, S., Ridge, A., Boone, K., Kahn, D., Rich, J., ... Langton, D. (2019). Fiber-optic distributed acoustic sensing of microseismicity, strain and temperature during hydraulic fracturing. Geophysics, 84(1), D11–D23. Klaasen, S., Paitz, P., Lindner, N., Dettmer, J., & Fichtner, A. (2021). Distributed acoustic sensing in volcano-glacial environments—mount meager, British columbia. Journal of Geophysical Research: Solid Earth, 126(11). Landrø, M., Bouffaut, L., Kriesell, H. J., Potter, J. R., Rørstadbotnen, R. A., Taweesintananon, K., ... others (2021). Sensing whales, storms, ships and earthquakes using an arctic fibre-optic cable.