Multiple layered ejecta (MLE) associated to impact craters on Mars are characterized by typical crater diameter 10 to 60 km and extensive superposed sheets of ejecta material (Fig. 1). These peculiar crater typologies often appear, but are not limited to, the lowlands near the dichotomy at the highlands lowlands boundary [1-4]. Figure 1 shows the prominent example of Tooting crater. Close relatives of DLEs are double-layered ejecta in which the inner layer of ejecta has a very sharp outline, and are usually associated to smaller crater, [5] (Fig. 1). Kotka crater on Mars (18°30’ N; 171°16’ W) is an example of crater with multiple layer ejecta. Ejecta surrounding Kotka typify many of the characteristics exhibited by MLE: ejecta appear as frozen, earlier fluidized lobes elongated radially to indicate the flow direction from the crater rims to the outward edges (Fig. 2). In an ongoing project, we are studying the geometry of the Kotka ejecta remnants to infer their flow dynamics following the impact. The rationale for the choice of the Kotka crater is the presence of several mounds protruding from the ground. During their flow, the ejecta have impacted against such mounds, from which the flow speed can be computed based on run-up and other dynamical criteria.
De Blasio, F., Ciceri, F., Crosta, G. (2017). Study of the Kotka Crater and Its Ejecta Dynamics. Intervento presentato a: Lunar and Planetary Science Conference, The Woodlands Waterway Marriott Hotel and Convention Center, The Woodlands, Texas.
Study of the Kotka Crater and Its Ejecta Dynamics
De Blasio, F;Crosta, G.
2017
Abstract
Multiple layered ejecta (MLE) associated to impact craters on Mars are characterized by typical crater diameter 10 to 60 km and extensive superposed sheets of ejecta material (Fig. 1). These peculiar crater typologies often appear, but are not limited to, the lowlands near the dichotomy at the highlands lowlands boundary [1-4]. Figure 1 shows the prominent example of Tooting crater. Close relatives of DLEs are double-layered ejecta in which the inner layer of ejecta has a very sharp outline, and are usually associated to smaller crater, [5] (Fig. 1). Kotka crater on Mars (18°30’ N; 171°16’ W) is an example of crater with multiple layer ejecta. Ejecta surrounding Kotka typify many of the characteristics exhibited by MLE: ejecta appear as frozen, earlier fluidized lobes elongated radially to indicate the flow direction from the crater rims to the outward edges (Fig. 2). In an ongoing project, we are studying the geometry of the Kotka ejecta remnants to infer their flow dynamics following the impact. The rationale for the choice of the Kotka crater is the presence of several mounds protruding from the ground. During their flow, the ejecta have impacted against such mounds, from which the flow speed can be computed based on run-up and other dynamical criteria.
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