000007158 001__ 7158
000007158 005__ 20241214122733.0
000007158 0247_ $$2DOI$$a10.1029/2024JB029568
000007158 037__ $$aSCART-2024-0191
000007158 100__ $$aYates, A.S.
000007158 245__ $$aSeasonal Snow Cycles and Their Possible Influence on Seismic Velocity Changes and Eruptive Activity at Ruapehu Volcano, New Zealand
000007158 260__ $$c2024
000007158 520__ $$aUnderstanding volcanic eruption triggers is critical toward anticipating future activity. While internal magma dynamics typically receive more attention, the influence of external processes remains less understood. In this context, we explore the relationship between seasonal snow cycles and eruptive activity at Ruapehu, New Zealand. This is motivated by apparent seasonality in the eruptive record, where a higher than expected proportion of eruptions (post-1960) occur in spring (including the two previous eruptions of 2006 and 2007). Employing recent advancements in passive seismic interferometry, we compute sub-surface seismic velocity changes between 2005 and 2009 using the cross-wavelet transform approach. Stations on the volcano record a higher velocity in winter, closely correlated with the presence of snow. Inverting for depth suggests these changes occur within the upper 300 m. Notably, we observe that the timing of the previous two eruptions coincides with a period associated with an earlier velocity decrease at approximately 200–300 m depth relative to the surface. Reduced water infiltration (as precipitation falls as snow) is considered a likely control of seasonal velocities, while modeling also points to a contribution from snow-loading. We hypothesize that this latter process may play a role toward explaining seasonality in the eruptive record. Our findings shed light on the complex interactions between volcanoes and external environmental processes, highlighting the need for more focused research in this area. Pursuing this line of inquiry has significant implications toward improved risk and hazard assessments at not just Ruapehu, but also other volcanoes globally that experience seasonal snow cover.
000007158 594__ $$aNO
000007158 6531_ $$avolcanoseismology
000007158 6531_ $$aambient noise
000007158 6531_ $$avelocity variations
000007158 6531_ $$amonitoring
000007158 6531_ $$aenvironmental seismology
000007158 700__ $$aCaudron, C.
000007158 700__ $$aMordret, A.
000007158 700__ $$aLesage, P.
000007158 700__ $$aPinel, V.
000007158 700__ $$aLecocq, T.
000007158 700__ $$aMiller, C.A.
000007158 700__ $$aLamb, O.D.
000007158 700__ $$aFournier, N
000007158 773__ $$ne2024JB029568$$pJournal of Geophysical Research: Solid Earth$$v129$$y2024
000007158 8560_ $$fthomas.lecocq@ksb-orb.be
000007158 85642 $$ahttp://github.com/ROBelgium/MSNoise
000007158 85642 $$ahttps://github.com/covseisnet/covseisnet
000007158 85642 $$ahttps://github.com/regeirk/pycwt
000007158 8564_ $$s513932$$uhttp://publi2-as.oma.be/record/7158/files/jgrb57063-fig-0010-m.jpg$$yConceptual model of possible unloading-induced degassing process related to loading/unloading of a snow-load. (a) Pre-winter (e.g., January–May): minimal snow-load present on the volcano. (b) Early winter (e.g., June–July): snow-load begins to accumulate, inducing a positive pressure change. (c) Late-winter (e.g., July–September): maximum snow-load present on the volcano. (d) Spring (e.g., September–November): snow-load begins to melt, with pressures decreasing in the subsurface.
000007158 8564_ $$s11625$$uhttp://publi2-as.oma.be/record/7158/files/jgrb57063-fig-0010-m.gif?subformat=icon$$xicon$$yConceptual model of possible unloading-induced degassing process related to loading/unloading of a snow-load. (a) Pre-winter (e.g., January–May): minimal snow-load present on the volcano. (b) Early winter (e.g., June–July): snow-load begins to accumulate, inducing a positive pressure change. (c) Late-winter (e.g., July–September): maximum snow-load present on the volcano. (d) Spring (e.g., September–November): snow-load begins to melt, with pressures decreasing in the subsurface.
000007158 8564_ $$s13422$$uhttp://publi2-as.oma.be/record/7158/files/jgrb57063-fig-0010-m.jpg?subformat=icon-180$$xicon-180$$yConceptual model of possible unloading-induced degassing process related to loading/unloading of a snow-load. (a) Pre-winter (e.g., January–May): minimal snow-load present on the volcano. (b) Early winter (e.g., June–July): snow-load begins to accumulate, inducing a positive pressure change. (c) Late-winter (e.g., July–September): maximum snow-load present on the volcano. (d) Spring (e.g., September–November): snow-load begins to melt, with pressures decreasing in the subsurface.
000007158 905__ $$apublished in
000007158 980__ $$aREFERD