Statistics – Methodology
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p23a0179p&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P23A-0179
Statistics
Methodology
5480 Volcanism (6063, 8148, 8450), 5499 General Or Miscellaneous, 6225 Mars, 8429 Lava Rheology And Morphology, 8485 Remote Sensing Of Volcanoes
Scientific paper
The goal of this study is to characterize the eruptive behavior of Olympus Mons and other major volcanoes in the Tharsis region on Mars, namely Arsia, Ascraeus, and Pavonis Montes. We are particularly interested in estimating flow speeds and volume fluxes for lava flows produced from vents at various locations between the summit and the basal scarp. Our methodology involves: (1) identifying pristine lava tubes and channels from the data received by the Thermal Emission Imaging System (THEMIS) on Mars Odyssey and the high-resolution Mars Orbiter Camera (MOC) aboard Mars Global Surveyor and reprojecting these images to compare with MOLA digital elevation data; (2) measuring the widths and depths of channels and tubes from the reprojected images and measuring the ground slopes from a slope map produced based on the MOLA 1/128° DEM; and (3) calculating flow speeds and total volume fluxes of the lava, based on assumed values of viscosity and density. To date, we have width, depth and ground slope measurements of 34 lava tubes and 170 channels from 50 MOC images of Olympus Mons. We will expand this dataset to include more lava tubes and channels from THEMIS images of Olympus Mons as well as both MOC and THEMIS images of other major Tharsis volcanoes. MOC data of Olympus Mons examined to date shows that channels are more numerous than tubes, but this may be due to the fact that tubes cannot be detected until they collapse and are therefore likely under represented due to sampling biases. We have noticed that tubes seem to be prevalent at or near the summit while channels are dominantly seen on the middle and lower flanks as well as the basal scarp, although both features can be seen on the entire volcano. Channels are found on a variety of slopes from 0 to 17 degrees, while tubes are found with 10 degree slopes or less.
Bruno Barbara C.
Fagents Sarah A.
Parcheta Carolyn
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