{"id":17829,"date":"2015-03-03T22:56:04","date_gmt":"2015-03-03T22:56:04","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=17829"},"modified":"2015-03-05T03:46:49","modified_gmt":"2015-03-05T03:46:49","slug":"eruption-of-the-villarica-volcano-in-central-chile","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/17829","title":{"rendered":"Eruption of the Villarrica volcano in central Chile"},"content":{"rendered":"
\"Suomi<\/a>

Suomi NPP VIIRS 0.7 \u00b5m Day\/Night Band, 1.6 \u00b5m near-IR, 3.9 \u00b5m shortwave IR, and 11.45 \u00b5m longwave IR images<\/p><\/div>\n

There was an explosive eruption of the Villarrica volcano in central Chile on the morning of 03 March 2015; the Buenos Aires VAAC<\/strong><\/a> issued their first volcanic ash advisory<\/strong><\/a> based upon initial detection on 06:38 UTC GOES-13 imagery, although media report<\/strong><\/a> and blog<\/strong><\/a> sources indicated that the eruption started closer to 06:00 UTC (3 am local time). A comparison of 06:07 UTC Suomi NPP VIIRS 0.7 \u00b5m Day\/Night Band (DNB), 1.6 \u00b5m near-IR, 3.9 \u00b5m shortwave IR, and 11.45 \u00b5m longwave IR images (above; <\/strong>courtesy of William Straka, SSEC)<\/strong> <\/em>revealed a bright glow on the DNB and near IR images, with a pronounced “hot spot” evident on the shortwave IR (yellow to orange pixels; the hottest shortwave IR brightness temperature was over 600 K!)<\/em> and even the longwave IR (darker black pixels)<\/em> images. The DNB image<\/strong><\/a> was particularly striking, with nearby clouds and surface features being illuminated by the eruption.<\/p>\n

MODIS and GOES-13 multispectral false-color Red\/Green\/Blue (RGB) images from the NOAA\/CIMSS Volcanic Cloud Monitoring<\/strong><\/a> site (below; click image to play animation)<\/strong><\/em> showed that there was detection of a thermal anomaly or “hot spot” (indicated by a red box)<\/em> as early as 04:20 UTC (MODIS) and 05:45 UTC (GOES-13); the volcanic cloud filament — which was estimated to be at an altitude of 30,000 feet — could be seen drifting to the southeast following the eruption.<\/p>\n

\"MODIS<\/a>

MODIS and GOES-13 false-color RGB images (click to play animation)<\/p><\/div>\n

On GOES-13 10.7 \u00b5m IR channel images (below; click image to play animation),<\/strong><\/em> the volcanic cloud initially exhibited an IR brightness temperature as cold as -42\u00baC<\/strong>\u00a0 (green color enhancement),<\/em> but the cloud filament quickly became very diffuse and difficult to identify on the IR images by 09:38 UTC.<\/p>\n

\"GOES-13<\/a>

GOES-13 10.7 \u00b5m IR images (click to play animation)<\/p><\/div>\n

The 12 UTC rawinsonde profiles from Puerto Montt, Chile (station identifier SCTE)<\/em> on 02 March and 03 March are shown below. On the 02 March profile, the -42\u00ba C temperature was at an altitude around 9400 meters or 30,800 feet; on the 03 March profile, -42\u00ba C was around 9100 meters or 29,900 feet.<\/p>\n

\"Puerto<\/a>

Puerto Montt, Chile 12 UTC rawinsonde profiles on 02 March and 03 March<\/p><\/div>\n

On GOES-13 3.9 \u00b5m shortwave IR images (below; click image to play animation)<\/strong><\/em> a “hot spot” (black to yellow to red color enhancement)<\/em> was seen for several hours after the initial eruption. The highest shortwave IR brightness temperature observed by GOES-13 was 340.8 K — much lower than than the >600 K observed with the higher spatial resolution Suomi NPP VIIRS instrument.<\/p>\n

\"GOES-13<\/a>

GOES-13 3.9 \u00b5m shortwave IR channel images (click to play animation)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

There was an explosive eruption of the Villarrica volcano in central Chile on the morning of 03 March 2015; the Buenos Aires VAAC issued their first volcanic ash advisory based upon initial detection on 06:38 UTC GOES-13 imagery, although media report and blog sources indicated that the eruption started closer to 06:00 UTC (3 am […]<\/p>\n","protected":false},"author":18,"featured_media":17830,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11,12,45,49,48,9],"tags":[],"class_list":["post-17829","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-13","category-modis","category-redgreenblue-rgb-images","category-suomi_npp","category-viirs","category-volcanic-activity"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/17829","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=17829"}],"version-history":[{"count":20,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/17829\/revisions"}],"predecessor-version":[{"id":17850,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/17829\/revisions\/17850"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/17830"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=17829"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=17829"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=17829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}