Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3609405c&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 9, CiteID L09405
Physics
5
Hydrology: Debris Flow And Landslides, Volcanology: Volcanic Hazards And Risks, Volcanology: Volcano Monitoring (7280), Seismology: Volcano Seismology (8419)
Scientific paper
Detection of ground shaking forms the basis of many lahar-warning systems. Seismic records of two lahar types at Ruapehu, New Zealand, in 2007 are used to examine their nature and internal dynamics. Upstream detection of a flow depends upon flow type and coupling with the ground. 3-D characteristics of seismic signals can be used to distinguish the dominant rheology and gross physical composition. Water-rich hyperconcentrated flows are turbulent; common inter-particle and particle-substrate collisions engender higher energy in cross-channel vibrations relative to channel-parallel. Plug-like snow-slurry lahars show greater energy in channel-parallel signals, due to lateral deposition insulating channel margins, and low turbulence. Direct comparison of flow size must account for flow rheology; a water-rich lahar will generate signals of greater amplitude than a similar-sized snow-slurry flow.
Cole S. E.
Cronin Scott J.
Manville V.
Sherburn Steven
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