{ "title": "HiPOD", "metadata": { "thumbnailURL": "bundle://header.jpg", "excerpt": "There is a fairly smooth crust on the Kasei Valles lava flow here, a short distance downstream from a major constriction." }, "version": "1.5", "identifier": "ESP_055335_2015", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: MONDAY, 28 OCTOBER 2019" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "That Lovely Lava" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "A cutout of the southern end of our observation, showing the remnants of ancient lava flow. Less than 5 km across. (NASA/JPL/University of Arizona)", "URL": "bundle://ESP_055335_2015-main.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "


There is a fairly smooth crust on the Kasei Valles lava flow here, a short distance downstream from a major constriction (lower left part of the image). The constriction would have disrupted preexisting crust, so the smooth crust here must have developed locally on a reasonably stable flow surface. The rise to peak flow would also probably have disrupted older crust.

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The flow was not stagnant, because there are some fractures that likely developed when the last flowing lava drained away. This suggests that this is a crust that developed over a fairly significant length of time over a steadily flowing active flow sometime after peak lava flux, and then lava drained from below.

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NASA/JPL/University of Arizona

ID: ESP_055335_2015
date: 17 May 2018
altitude: 281 km

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