{"id":4785,"date":"2015-06-19T08:40:13","date_gmt":"2015-06-19T08:40:13","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=4785"},"modified":"2015-06-19T08:40:13","modified_gmt":"2015-06-19T08:40:13","slug":"hot-lava-flows-discovered-in-venus","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/hot-lava-flows-discovered-in-venus\/","title":{"rendered":"Hot lava flows discovered in Venus"},"content":{"rendered":"
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\"Evidence<\/a>
Evidence for active volcanoes on Venus<\/figcaption><\/figure>\n

ESA\u2019s Venus Express has found the best evidence yet for active volcanism on Earth\u2019s neighbour planet.<\/span><\/p>\n

Seeing the planet\u2019s surface is extremely difficult due to its thick atmosphere, but radar observations by previous missions to Venus have revealed it as a world covered in volcanoes and ancient lava flows.<\/span><\/p>\n

Venus is almost exactly the same size as Earth and has a similar bulk composition, so is likely to have an internal heat source, perhaps due to radioactive heating. This heat has to escape somehow, and one possibility is that it does so in the form of volcanic eruptions.<\/span><\/p>\n

Some models of planetary evolution suggest that Venus was resurfaced in a cataclysmic flood of lava around half a billion years ago. But whether Venus is active today has remained a hot topic in planetary science.<\/span><\/p>\n

ESA\u2019s Venus Express, which completed its eight-year study of the planet last year, conducted a range of observations at different wavelengths to address this important question.<\/span><\/p>\n<\/div>\n

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In a study published in\u00a02010<\/span><\/a>, scientists reported that the infrared radiation coming from three volcanic regions was different to that from the surrounding terrain. They interpreted this as coming from relatively fresh lava flows that had not yet experienced significant surface weathering. These flows were found to be less than 2.5 million years old, but the study could not establish whether there is still active volcanism on the planet.\u00a0\u00a0<\/span><\/p>\n

An additional piece of evidence was reported in2012<\/span><\/a>, showing a sharp rise in the sulphur dioxide content of the upper atmosphere in 2006\u20132007, followed by a gradual fall over the following five years. Although changes in wind patterns could have caused this, the more intriguing possibility is that episodes of volcanic activity were injecting vast amounts of sulphur dioxide into the upper atmosphere.<\/span><\/p>\n

Now, using a near-infrared channel of the spacecraft\u2019s Venus Monitoring Camera (VMC) to map thermal emission from the surface through a transparent spectral window in the planet\u2019s atmosphere, an international team of planetary scientists has spotted localised changes in surface brightness between images taken only a few days apart.<\/span><\/p>\n<\/div>\n

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\u201cWe have now seen several events where a spot on the surface suddenly gets much hotter, and then cools down again,\u201d says Eugene Shalygin from the Max Planck Institute for Solar System Research (MPS) in Germany, and lead author of the paper reporting the results in\u00a0Geophysical Research Letters\u00a0<\/i>this month.<\/span><\/p>\n

\u201cThese four \u2018hotspots\u2019 are located in what are known from radar imagery to be tectonic rift zones, but this is the first time we have detected that they are hot and changing in temperature from day to day. It is the most tantalising evidence yet for active volcanism.\u201d<\/span><\/p>\n

The hotspots are found along the Ganiki Chasma rift zone close to the volcanoes Ozza Mons and Maat Mons. Rift zones are results of fracturing of the surface, which is often associated with upwelling of magma below the crust. This process can bring hot material to the surface, where it may be released through fractures as a lava flow.<\/span><\/p>\n

\u201cThese observations are close to the limits of the spacecraft\u2019s capabilities and it was extremely difficult to make these detections with Venus\u2019 thick clouds impairing the view,\u201d says co-author Wojciech Markiewicz. \u201cBut the VMC was designed to make these systematic observations of the surface and luckily we clearly see these regions that change in temperature over time, and that are notably higher than the average surface temperature.\u201d<\/span><\/p>\n<\/div>\n

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Because VMC\u2019s view is blurred by the clouds, the areas of increased emission appear spread out over large areas more than 100 km across, but the hot regions on the surface below are probably much smaller. Indeed, for the hotspot known as \u2018Object A\u2019, the team calculate that the feature may only be around 1 square kilometre in size, with a temperature of 830\u00b0C, much higher than the global average of 480\u00b0C.<\/span><\/p>\n

The Ganiki Chasma rift zone was already considered to be one of the most recently geologically active regions on the planet, and as the new analysis suggests, it is still active today.<\/span><\/p>\n

\u201cIt looks like we can finally include Venus in the small club of volcanically active Solar System bodies,\u201d says H\u00e5kan Svedhem, ESA\u2019s Venus Express project scientist.<\/span><\/p>\n

\u201cOur study shows that Venus, our nearest neighbour, is still active and changing in the present day \u2013 it is an important step in our quest to understand the different evolutionary histories of Earth and Venus.\u201d<\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

ESA\u2019s Venus Express has found the best evidence yet for active volcanism on Earth\u2019s neighbour planet. Seeing the planet\u2019s surface is extremely difficult due to its thick atmosphere, but radar observations by previous missions to Venus have revealed it as a world covered in volcanoes and ancient lava flows. Venus is almost exactly the same […]<\/p>\n","protected":false},"author":6,"featured_media":4786,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-4785","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large-300x187.jpg",300,187,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",600,375,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",600,375,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",550,344,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",95,59,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",625,391,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",96,60,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/06\/Evidence_for_active_volcanoes_on_Venus_large.jpg",150,94,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"News<\/a>","tag_info":"News","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/4785","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=4785"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/4785\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/4786"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=4785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=4785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=4785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}