Exposed Bedrock in Eos Chasma
Exposed Bedrock in Eos Chasma
ESP_013573_1685  Science Theme: Geologic Contacts/Stratigraphy
Crater formation is a dynamic process that unleashes a powerful shock wave that can vaporize and melt rock, in addition to displacing the surface to create the initial crater-cavity. Larger craters (more than 10 kilometers) may exhibit a central structure that is formed by uplifting and exposing bedrock from the subsurface.

This 47-kilometer (29 mi) diameter crater in Eos Chasma exhibits a central uplift comprised of well-exposed fractured bedrock. HiRISE color imaging reveals fine-scale details in addition to two other key features observed at crater central uplifts. Here, we see impact melts coating the uplift, which when molten, would have flowed downslope and been “captured” by the uplifted bedrock as it rose through the melt-lined cavity early in the crater’s formation. We also see rock fragments (also known as clasts) that would have been incorporated into the melt at various stages.

HiRISE details not only offer insights into subsurface composition and regional geologic history, but also about impact cratering and uplift formation process in general.

Written by: Vidhya Ganesh Rangarajan, Livio Leonardo Tornabene  (14 February 2024)

This is a stereo pair with ESP_013151_1685.
Acquisition date
19 June 2009

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
263.6 km (163.9 miles)

Original image scale range
55.4 cm/pixel (with 2 x 2 binning) so objects ~166 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
41°, with the Sun about 49° above the horizon

Solar longitude
287.9°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  341.8°
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NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.