Tag Archives: calderas

HiRISE: A caldera’s steep slopes

This image shows part of the steep wall of the caldera (a large volcanic crater) at the top of Ascraeus Mons, one of Mars’ giant volcanoes. We can see chutes carved into the soft dust that has built up on … Continue reading

Posted in Reports | Tagged , , , , , , , , , | Comments Off

THEMIS: Over the summit of Pavonis Mons

THEMIS Image of the Day, September 28, 2018. Today’s VIS image crosses the flanks and summit of Pavonis Mons. Calderas are down-dropped areas which collapse when lava inside the volcano withdraws, removing its support for the heavy rock layers above. … Continue reading

Posted in Reports | Tagged , , , , , , , , , , | Comments Off

THEMIS: Ice-rich clouds over Arsia Mons’ caldera

THEMIS Image of the Day, September 19, 2018. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations … Continue reading

Posted in Reports | Tagged , , , , , , , , , , | Comments Off

THEMIS: Volcanic vent in Arsia Mons caldera

THEMIS Image of the Day, January 5, 2018. This THEMIS image shows part of the southern margin of the summit caldera. This image contains a variety of features representing the major events related to the formation of the volcano. At … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , , , , , | Comments Off

THEMIS: Chains of pit craters near summit of Arsia Mons volcano

THEMIS Image of the Day, January 4, 2018. The three large aligned Tharsis volcanoes are Arsia Mons, Pavonis Mons and Ascraeus Mons (from south to north). There are collapse features on all three volcanoes, on the southwestern and northeastern flanks. … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , , , , , | Comments Off

THEMIS: Pits at caldera’s edge

THEMIS Image of the Day, January 3, 2018. This THEMIS image shows part of the caldera floor of Arsia Mons. It is not uncommon for calderas to have “flat” floors after the final explosive eruption the empties the subsurface magma … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , , , , , | Comments Off

THEMIS: Flows on the caldera floor of Arsia Mons

THEMIS Image of the Day, January 2, 2018. This THEMIS image shows part of the caldera floor of Arsia Mons. It is not uncommon for calderas to have “flat” floors after the final explosive eruption the empties the subsurface magma … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , , | Comments Off

THEMIS: Morning sunlight on Pavonis Mons caldera

THEMIS Image of the Day, November 10, 2017. This image shows the central part of the smaller summit caldera on Pavonis Mons. On the top side of the caldera is a complex region of fault related collapse of the wall … Continue reading

Posted in Reports | Tagged , , , , , , , , , , | Comments Off

THEMIS: Faults weaken summit caldera wall on Pavonis Mons

THEMIS Image of the Day, November 8, 2017. This image shows the western part of the smaller summit caldera on Pavonis Mons. On this side of the caldera is a complex region of fault related collapse of the wall of … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , , , | Comments Off

THEMIS: Summit caldera of Pavonis Mons

THEMIS Image of the Day, November 7, 2017. This image shows part of the smaller summit caldera on Pavonis Mons. This caldera is approximately 5km deep. Near the bottom of the image is a region where part of the caldera … Continue reading

Posted in Reports | Tagged , , , , , , , , , , | Comments Off