THEMIS: Sirenum Fossae

Graben in Sirenum Fossae (THEMIS_IOTD-20141021)THEMIS Image of the Day, October 21, 2014. The linear depression in the center of this VIS image is a graben — a fault-bounded block of material. The graben crosses the crater and ejecta in the middle of the image, indicating that the graben formed after the impact that created the crater.

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