PRESENT-DAY GULLY ACTIVITY (DARK FLOWS AND BLOCK MOVEMENTS) IN SISYPHI CAVI, MARS - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Communication Dans Un Congrès Année : 2020

PRESENT-DAY GULLY ACTIVITY (DARK FLOWS AND BLOCK MOVEMENTS) IN SISYPHI CAVI, MARS

J. Raack
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T. Heyer
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V. Bickel
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H. Hiesinger
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A. Johnsson
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Résumé

Introduction: We present the final results of our study regarding contemporary gully activity in the Sisyphi Cavi region on Mars [1]. We choose this specific region due to a high number of active gullied slopes [2, 3], as well as a former detailed study of ongoing activity of one specific gully [2]. Our study is mainly based on multi-temporal HiRISE (n = 212) and CTX (n = 382) imagery. In addition, we used HRSC, THEMIS-IR, CaSSIS, MOLA DTM, and TES datasets for our intensive survey of all gullies in the Sisyphi Cavi region. Study region: The study region (340° to 10° E and 66° to 76°S) comprises the complete Sisyphi Cavi region, an area with numerous polar pits up to ~1000 m deep [2] (Fig. 1). It is proposed that the south polar pitted terrains (including Sisyphi Cavi) were formed by collapse induced by basal melting of volatile-rich surface layers [4]. The complete study region is covered in a decimeter thick seasonal CO2 slab ice during winter with extensive surface defrosting during mid-spring and summer [2]. The steep slopes of the numerous pits host fresh-looking gullies, some with ongoing present-day activity [1-3]. Methods: We mapped and measured the orientation of all gullies (n = 17,760, based on the identification of a clearly visible alcove) in Sisyphi Cavi based on CTX images. We used multi-temporal HiRISE imagery for detailed analyses of active gullies.
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Dates et versions

hal-03091544 , version 1 (31-12-2020)

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J. Raack, Susan J. Conway, T. Heyer, V. Bickel, Meven Philippe, et al.. PRESENT-DAY GULLY ACTIVITY (DARK FLOWS AND BLOCK MOVEMENTS) IN SISYPHI CAVI, MARS. 51st Lunar and Planetary Science Conference, Mar 2020, The Woodlands, Houston, Texas, United States. ⟨hal-03091544⟩
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