On the variations of flow rate in non-explosive lava eruptions

Details On the variations of flow rate in non-explosive lava eruptions On the variations of flow rate in non-explosive lava eruptions

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.114..505s&link_type=abstract

Earth and Planetary Science Letters, Volume 114, Issue 4, p. 505-516.

Mathematics

Logic

38

Scientific paper

A physical model is developed to determine factors which influence the dynamics of non-explosive lava eruptions. In the model, magma rises in a laminar regime from an overpressured chamber surrounded by elastic rock and erupts at the surface, where the accumulation of lava may alter the vent pressure. In a flow rate versus volume diagram, an eruption follows a path which is sensitive to relative changes in flow variables such as viscosity, conduit dimensions and thickness of lava over the vent. The path does not depend on the unknown elastic properties of the country rock or the chamber dimensions. With appropriate volcanological data, an observed flow rate versus volume path can be interpreted. The approach is applied to three well-documented eruptions. In each case the eruption rate was partially influenced by decreasing chamber pressure. The 1988-1990 eruption of Lonquimay (Chile) exhibits an early phase of conduit shrinkage which lasted about 100 days, probably due to magma solidification against country rock. The 1979 eruption of La Soufrière de Saint Vincent (West Indies) was initially affected by lava dome growth and later passed through a phase possibly caused by constriction of the conduit. The 1943-1952 eruption of Paricutín (Mexico) was affected by changes of lava level in the cinder cone and magma properties. In these three eruptions, the pre-eruptive chamber overpressures were similar (10-20 MPa) even though the erupted volumes differed by as much as two orders of magnitude.

Affiliated with

Also associated with

No associations

Rating

On the variations of flow rate in non-explosive lava eruptions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with On the variations of flow rate in non-explosive lava eruptions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the variations of flow rate in non-explosive lava eruptions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1273524