000007583 001__ 7583
000007583 005__ 20250417114414.0
000007583 0247_ $$2DOI$$a10.30909/vol/cyrk413
000007583 037__ $$aSCART-2025-0133
000007583 100__ $$aYates, A.
000007583 245__ $$aPrecursory velocity changes prior to the 2019 paroxysms at Stromboli volcano, Italy, from coda wave interferometry
000007583 260__ $$c2025
000007583 520__ $$aOpen-conduit basaltic volcanoes are susceptible to sudden transitions from mild activity to violent explosive eruptions with little to no warning. Such was the case at Stromboli in the summer of 2019, when two paroxysmal explosions occurred within approximately two months (July 3 and August 28). We apply coda wave interferometry to identify possible transitions in behavior in the build-up to these events, computing seismic velocity changes using five broadband seismic stations on the volcano between 2013–2022. This timeframe encompasses a range of volcanic activity including effusive activity, major explosions and paroxysms. Cross-correlation functions are computed both between pairs of stations and single-station cross-components in multiple frequency bands that allow the sampling of different depths (between approximately 100–1000 m) within the plumbing system. Shallow velocity changes (1–2 Hz and 2–4 Hz) reveal mid-to-long term precursors prior to the paroxysms in 2019. For example, we observe that 2–4 Hz velocities recorded at the station closest to the active crater show an increase of 0.2–0.3 % relative to velocities recorded at other stations. This increase is largely accumulated from mid-2017, coinciding with previously observed heightened activity at the volcano, peaking approximately one month prior to the first paroxysm. A long-term decrease is also observed in deeper velocity changes (0.5–1.0 Hz) during the same time interval. It is hypothesized that these changes represent greater magma overpressure from increased volatile input from depth. The different response in the shallow subsurface may reflect a local response due to the same source within the vicinity close of the crater terrace. These findings illustrate how coda wave interferometry can provide meaningful insights into the evolving dynamics of open-conduit basaltic volcanoes.
000007583 594__ $$aNO
000007583 700__ $$aCaudron, C.
000007583 700__ $$aMordret, A.
000007583 700__ $$aLesage, P.
000007583 700__ $$aCannata, A.
000007583 700__ $$aCannavo, F.
000007583 700__ $$aLecocq, T.
000007583 700__ $$aPinel, V.
000007583 700__ $$aZaccarelli, L.
000007583 773__ $$c203-223$$pVolcanica$$v8$$y2025
000007583 8560_ $$fthomas.lecocq@ksb-orb.be
000007583 8564_ $$s72139$$uhttps://publi2-as.oma.be/record/7583/files/Figure8.png$$yVarious mid-to-long term observations at Stromboli and two conceptual models that may explain relative increase at STRA station in response to increased magma overpressure. [A] Observations at Stromboli prior to 2019 paroxysms compared with relative increase of velocity at STRA station (smoothed using 365-d moving window for visual simplicity). Red-dashed-lines = paroxysms, dark-green shading = 2014 flank eruption. [B] Model one: Local velocity increase near the crater terrace with velocity decrease at depth. [C] Model two: Broad velocity decrease, with reduced influence near the crater terrace.
000007583 8564_ $$s6700$$uhttps://publi2-as.oma.be/record/7583/files/Figure8.gif?subformat=icon$$xicon$$yVarious mid-to-long term observations at Stromboli and two conceptual models that may explain relative increase at STRA station in response to increased magma overpressure. [A] Observations at Stromboli prior to 2019 paroxysms compared with relative increase of velocity at STRA station (smoothed using 365-d moving window for visual simplicity). Red-dashed-lines = paroxysms, dark-green shading = 2014 flank eruption. [B] Model one: Local velocity increase near the crater terrace with velocity decrease at depth. [C] Model two: Broad velocity decrease, with reduced influence near the crater terrace.
000007583 8564_ $$s8209$$uhttps://publi2-as.oma.be/record/7583/files/Figure8.jpg?subformat=icon-180$$xicon-180$$yVarious mid-to-long term observations at Stromboli and two conceptual models that may explain relative increase at STRA station in response to increased magma overpressure. [A] Observations at Stromboli prior to 2019 paroxysms compared with relative increase of velocity at STRA station (smoothed using 365-d moving window for visual simplicity). Red-dashed-lines = paroxysms, dark-green shading = 2014 flank eruption. [B] Model one: Local velocity increase near the crater terrace with velocity decrease at depth. [C] Model two: Broad velocity decrease, with reduced influence near the crater terrace.
000007583 905__ $$apublished in
000007583 980__ $$aREFERD