This
image shows part of the complex caldera at the summit of the volcano.
Calderas are found at the tops of volcanoes and are the source region
for magma that rises from an underground lava source to erupt at the
surface. Volcanoes are formed by repeated flows from the central
caldera. The final eruptions can pool within the summit caldera, leaving
a flat surface as they cool. Calderas are also a location of collapse,
creating rings of tectonic faults that form the caldera rim. Ascraeus
Mons has several caldera features at its summit.
The Odyssey spacecraft has spent over 15 years in orbit around Mars,
circling the planet more than 69000 times. It holds the record for
longest working spacecraft at Mars. THEMIS, the IR/VIS camera system,
has collected data for the entire mission and provides images covering
all seasons and lighting conditions. Over the years many features of
interest have received repeated imaging, building up a suite of images
covering the entire feature. From the deepest chasma to the tallest
volcano, individual dunes inside craters and dune fields that encircle
the north pole, channels carved by water and lava, and a variety of
other feature, THEMIS has imaged them all. For the next several months
the image of the day will focus on the Tharsis volcanoes, the various
chasmata of Valles Marineris, and the major dunes fields. We hope you
enjoy these images!
Orbit Number: 17440 Latitude: 11.128 Longitude: 255.731 Instrument: VIS
Captured: 2005-11-19 08:59
https://photojournal.jpl.nasa.gov/catalog/PIA21822
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