Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.v21b1979d&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #V21B-1979
Physics
[5480] Planetary Sciences: Solid Surface Planets / Volcanism, [6219] Planetary Sciences: Solar System Objects / Io, [8450] Volcanology / Planetary Volcanism, [8485] Volcanology / Remote Sensing Of Volcanoes
Scientific paper
Volcanic eruptions on Io and Earth are monitored by a variety of thermal remote sensing instruments. While higher resolution data are always desirable, we have developed methodologies to constrain the style of volcanic eruption using low spatial, spectral, and temporal resolution data. For the volcanic moon Io, this is necessitated by the limits of spacecraft and Earth-based telescopic observations. Eruption style can be classified using the concept of "thermal signature" which focuses on the temporal evolution of thermal emission spectra [1]. We find that the ratio of the emission at 2 µm and 5 µm, and how this ratio changes temporally, is often diagnostic of effusive eruption style, even in low spatial resolution data [2]. Tests using ground-based thermal data for terrestrial “ground truth” cases show that this classification system is equally valid for Earth. A square meter of an active lava lake on Io looks very similar to a square meter of an active lava lake on Earth. The same goes for pahoehoe flows. This validation of “thermal signature” means that appropriate physical models can be selected to interpret the data. On Io, the scale of eruptions can utterly dwarf their terrestrial counterparts. “Outburst” eruptions, known to be caused by extensive lava fountaining, can radiate >1013 W. The smallest thermal anomalies detected on Io in thermal infrared data are still larger than any contemporaneous mafic volcanic activity on Earth. The large volumes of lava erupted on Io (e.g., >56 km3 at Pillan in 1997) are an expression of internal tidal heating. It may be that high compressive stresses in the lower lithosphere inhibit magma ascent, and so only relatively large volumes of magma can overcome this “stress barrier” and reach the surface. The results of the “thermal signature” analysis [2] can be used as an aid in the planning of future space-borne instruments that can be used for volcano monitoring on Io, as well as on Earth. This work was performed at the Jet Propulsion Laboratory-California Institute of Technology, under NASA contract, with support from the NASA Outer Planets Research Program. © 2009. All rights reserved. References: [1] Davies, A. G., 2007, Volcanism on Io - A Comparison with Earth, Cambridge University Press, 372 pages. [2] Davies, A. G., Keszthelyi L. P., and Harris, A. J. L., 2009, The Thermal Signature of Volcanic Eruptions on Io and Earth, JVGR, submitted.
Davies Andrew G.
Harris Jessica A.
Keszthelyi Laszlo P.
No associations
LandOfFree
The Optimization of Spatial, Spectral, and Temporal Resolution for Constraining Eruption Style on Earth and Io with Thermal Remote Sensing 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 The Optimization of Spatial, Spectral, and Temporal Resolution for Constraining Eruption Style on Earth and Io with Thermal Remote Sensing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Optimization of Spatial, Spectral, and Temporal Resolution for Constraining Eruption Style on Earth and Io with Thermal Remote Sensing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1776251