Topographic characteristics of double-type coronae on Venus from Magellan data

ISU Abstracts

TOPOGRAPHIC VENUS FROM

CHARACTERISTICS MAGELLAN DATA

OF

(II)22

DOUBLE-TYPE

CORONAE

ON

T. Tl)rmtieq and K. Kauhanen,Department of Geosciences and Astronomy, Astronomy Division,

University of Oulu, P.O. Box 333, FIN-90571 Oulu, Finland We have studied topography of 40 double-type coronae and corona-like volcano-tectonic features on Venus from Magellan altimetry data. These features were first identified on the basis of their planfoxm and morphology. We examined the topographic characteristics of the annulus and the corona interior, and the presence of the outer annular moat in the double coronae. The double coronae and corona-like features can be classified into 3 classes based on the presence and type of a topographic ring structure. In class I, double coronae have a raised topographic annulus. A structural annulus or annuli of concentric ridges or sometimes fractures are usually located on the slopes or at the base of this topographic high. 75% of the double-type coronae and corona-like features (30 out of 40) fall into this class. Class II double coronae have an annular topographic trough, which typically coincides with an annular band of less deformed, smooth-looking surface located between two rings of concentric fractures. This class can be divided into two subclasses based on the topography of the structural annuli. 20% (8) of the features belong to the class II. There are also two double-type coronae that do not have a recognisable topographic ring although a structural annulus is observed (class III). Thirty-one of the double-type coronae have interiors that are considerably lower than the surrounding plains. We also observed that 40% (16) of the doubletype coronae have a topographic outer moat exterior to at least part of the annulus. All but one of these moats are adjacent to class I annular topographic rims. These topographic observations help LOconstrain models for formation and evolution of the double-type coronae and corona-like features on Venus. Ongoing work focuses on the quantitative characterisation of topography of the doubletype coronae and more detailed observations of the geologic history of selected type features.

ROBOTIC

SYSTEMS: INTELLIGENCE THROUGH INTROSPECTIVE REASONING by Lia Noemi Tusanotte

Cisnero Padre Don Rha 1, 4 A 36203 Vigo - Pontevedra - Spain Phone Number: (34) (86) 48 19 46 E-mail: [email protected] Abstract The objective through

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