Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p31b..13k&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P31B-13
Mathematics
Logic
5470 Surface Materials And Properties, 5480 Volcanism (8450), 6225 Mars
Scientific paper
Mars Orbiter Laser Altimeter (MOLA) onboard MGS spacecraft produced a large set of 300-m-spaced precise measurements of Mars surface elevation. We use this data set to study statistical characteristics of topography. We present new results on kilometer-scale topographic patterns of Daedalia Planum. For all MOLA profiles in the area 35S - 10S, 135W - 105W we calculated a characteristic of profile curvature at a set of baselines from 0.6 km to 10 km. For each cell of a grid covering the area under study we calculated the curvature-frequency distribution at each baseline. The width of the frequency distributions can be considered as a characteristic of roughness at a scale defined by the baseline length. The median curvature characterizes prevalence of convex or concave segments of the profiles. These parameters plotted within the grid form maps of kilometer-scale topographic patterns. Daedalia Planum is volcanic plain formed mainly by lava flows from Arsia Mons. Different generations of the lava flows display distinctively different kilometer-scale topographic patterns. Middle Amazonian flows (unit At5 according to USGS 1:15M geological map by D.H.Scott and K.L.Tanaka) are characterized by the steep increase of roughness at short baselines and by prevalence of convex profiles, while Late Hesperian flows (AHt3, Ht2, Ht1) are relatively rougher at longer baselines and often display prevalence of a concave relief. The roughness maps allow to accurately and reliably outline the units. High-resolution MOC images show high diversity of tens-meter-scale surface patterns within all units, as well as a systematic difference correlating with kilometer-scale topography pattern characteristics. MOC images show various buried and exhumed small-scale features in the areas and evidences for presence and erosion of surficial deposits of various thickness. The difference in kilometer-scale statistics of topography is probably controlled by the presence and characteristics of these surficial deposits rather than by original topography patterns of the pristine lava flow surface. Thus the difference in the kilometer-scale topographic pattern between flow generations reflects primarily the age difference, though some role of emplacement mode cannot be excluded.
Head James W.
Kreslavsky Mikhail A.
No associations
LandOfFree
Statistical Characterization of Kilometer-Scale Topography of Volcanic Units In Daedalia Planum, Mars: New Results From MGS MOLA Data Analysis 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 Statistical Characterization of Kilometer-Scale Topography of Volcanic Units In Daedalia Planum, Mars: New Results From MGS MOLA Data Analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Statistical Characterization of Kilometer-Scale Topography of Volcanic Units In Daedalia Planum, Mars: New Results From MGS MOLA Data Analysis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1239122