Downflow Morphologic Variations in Hawaiian Lava Flows: Implications for Modeling Planetary Lava Flow Emplacement
Models for the emplacement of lava flows on planetary surfaces utilize morphologic properties of flows to constrain eruption conditions, cooling history, and/or the physical properties of lavas. A variety of thermal and rheologic models have been used to assess the types of volcanic processes that have occurred on other planets. Most models of flow behavior use average values of flow width and/or flow thickness based on a limited number of measurements. The precision of these measurements, in particular of flow thickness, is highly variable. Changes in flow dimensions along the length of a lava flow represent the combined influences of a series of complex phenomena, including variations due temperature-dependent rheologic properties, variations due to time-variable supply conditions, and changes in the nature and geometry of the underlying surface, as well as the development of a brittle crustal layer. Variations in downflow dimensions thus provide important information regarding eruption and flow emplacement history, but are rarely used in quantitative analyses of flow dynamics. In order to interpret and utilize downflow morphologic variations of planetary lava flows, data from well documented terrestrial flows are being analyzed.
Lunar and Planetary Science Conference
- Pub Date:
- March 1996
- FLOW MORPHOLOGY;
- LAVA FLOWS;
- PUU OO;