{"id":104585,"date":"2023-08-31T08:55:38","date_gmt":"2023-08-31T08:55:38","guid":{"rendered":"https:\/\/www.bgs.ac.uk\/?p=104585"},"modified":"2024-02-27T14:11:22","modified_gmt":"2024-02-27T14:11:22","slug":"in-photos-a-volcanic-field-trip","status":"publish","type":"post","link":"https:\/\/www.bgs.ac.uk\/news\/in-photos-a-volcanic-field-trip\/","title":{"rendered":"In photos: a volcanic field trip"},"content":{"rendered":"\n<section class=\"wp-block-bgs-blocks-content-container content-section\"><div class=\"container\"><div class=\"row\"><div class=\"col-12\">\n<p>I have recently returned from a couple of weeks of fieldwork on Mount St Helens volcano in the Cascades, US, with Julia Eychenne from Laboratoire Magmas et Volcans (LMV) Volcanology, France and David Damby from the United States Geological Survey, and in collaboration with the Cascades Volcano Obervatory. The focus of our fieldwork was the <a href=\"https:\/\/www.usgs.gov\/volcanoes\/mount-st.-helens\/science\/1980-cataclysmic-eruption\" target=\"_blank\" rel=\"noreferrer noopener\">1980 cataclysmic eruption of Mount St Helens<\/a>, which produced the largest debris avalanche in recorded history as much of the northern flank of the volcano was removed. This avalanche led to a powerful blast which stripped much of the surrounding area of trees and produced a plume of ash that lofted to more than 30 km above sea level. Ash was dispersed many hundreds of kilometres away from the volcano. Plinian plumes, pyroclastic density currents and lahars (mixtures of volcanic material and water) followed and continued over the following months.<\/p>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0004.jpg\" class=\"attachment-medium size-medium\" alt=\"Sam Engwell sampling blast deposits from the 1980 eruption of Mount St Helens. Samantha Engwell \u00a9 BGS \/ UKRI\" \/><figcaption class=\"caption sm-line\">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Sam Engwell sampling blast deposits from the 1980 eruption of Mount St Helens. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0002.jpg\" class=\"attachment-medium size-medium\" alt=\"Sam Engwell sampling blast deposits from the 1980 eruption of Mount St Helens. Samantha Engwell \u00a9 BGS \/ UKRI\" \/><figcaption class=\"caption sm-line\">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Sam Engwell sampling blast deposits from the 1980 eruption of Mount St Helens. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<p>Given the scale and the range of eruptive behaviour that occurred during this eruption, it presents a case study that enables scientific investigation from a range of perspectives. Across our field team, interests ranged from eruption dynamics, human health impacts and ash resuspension. We dug holes through the deposits to allow us to access the whole sequence of the eruption, collecting blast samples and ash deposits from several locations across the blast area.<\/p>\n\n\n<figure  class=\"img-wrap\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0009-150x150.jpg\" class=\"lazy-blur\" alt=\"The view towards Mount St Helens crater from the pumice plain. Samantha Engwell \u00a9 BGS \/ UKRI\" data-src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0009.jpg\" \/><figcaption class=\"caption sm-line\">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>The view towards Mount St Helens&#8217; crater from the pumice plain. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t\n\t\t\t\t<\/figcaption><\/figure>\n\n\n<p>While we initially focused on the 18 May 1980 blast deposits, a day in the field with Cascades Volcano Observatory scientist Heather Wright introduced us to deposits from several older eruptions from Mount St Helens which also piqued our interest.<\/p>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0005.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Logs from trees that were removed from the 1980 blast still floating in Spirit Lake, with Mount St Helens obscured by clouds in the background. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_29670\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0005.jpg\" class=\"attachment-medium size-medium\" alt=\"Logs from trees that were removed from the 1980 blast still floating in Spirit Lake, with Mount St Helens obscured by clouds in the background. Samantha Engwell \u00a9 BGS \/ UKRI\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Logs from trees that were removed from the 1980 blast still floating in Spirit Lake, with Mount St Helens obscured by clouds in the background. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0005.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Logs from trees that were removed from the 1980 blast still floating in Spirit Lake, with Mount St Helens obscured by clouds in the background. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_29670\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0003.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Mount St Helens is one of several volcanoes in the region. In this picture, you can just about spot Mount Hood in the background behind Mount St Helens. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_29670\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0003.jpg\" class=\"attachment-medium size-medium\" alt=\"Mount St Helens is one of a several volcanoes in the region and here you can just about spot Mount Hood in the background behind Mount St Helens. Samantha Engwell \u00a9 BGS \/ UKRI\" \/><\/a><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Mount St Helens is one of several volcanoes in the region. In this picture, you can just about spot Mount Hood in the background behind Mount St Helens. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0003.jpg\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Mount St Helens is one of several volcanoes in the region. In this picture, you can just about spot Mount Hood in the background behind Mount St Helens. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_29670\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<p>Over the coming months, the team will conduct geophysical and chemical analyses to improve understanding of the deposits, providing further insights into the eruption.<\/p>\n\n\n\t\t\t\t<div  class=\"owl-carousel carousel-primary-color carousel owl-theme thumbs-carousel-js\">\n\t\t\t\t\t<div class=\"item\"><figure  class=\"img-wrap\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0007.jpg\" class=\"attachment-medium size-medium\" alt=\"Mount Adams also viewed from Mount St Helens. Samantha Engwell \u00a9 BGS \/ UKRI\" \/><figcaption class=\"caption sm-line\">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Mount Adams also viewed from Mount St Helens. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t\n\t\t\t\t<\/figcaption><\/figure><\/div><div class=\"item\"><figure  class=\"img-wrap\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2023\/08\/IMG-20230816-WA0010.jpg\" class=\"attachment-medium size-medium\" alt=\"Cascades Volcano Observatory, where we discussed with USGS scientists about MSH and its eruptions. Samantha Engwell \u00a9 BGS \/ UKRI\" \/><figcaption class=\"caption \">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Cascades Volcano Observatory, where we discussed Mount St Helens and its eruptions with USGS scientists. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t\n\t\t\t\t<\/figcaption><\/figure><\/div>\t\t\t\t<\/div>\n\t\t\t\t\n\n\n<p>The fieldwork was made possible through collaboration with Cascades Volcano Observatory. Many thanks to Alexa Van Eaton, Heather Wright and Richard Waitt for providing lots of context on the eruption, deposits and field relationships, and ensuring we had a great trip!<\/p>\n\n\n\t\t<h2>About author<\/h2>\n\t\t<div>\n\t\t\t<div class=\"cards cards-contact no-shape\">\n\t\t\t\t\t\t\t\t<div class=\"media-wrap\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/04\/46169.jpg\" class=\"lazy-blur wp-post-image\" alt=\"46169\" data-src=\"https:\/\/www.bgs.ac.uk\/wp-content\/uploads\/2020\/04\/46169.jpg\" \/>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"info-wrap\">\n\t\t\t\t\t<div class=\"info\">\n\t\t\t\t\t\t<h5>Dr Samantha Engwell<\/h5>\n\t\t\t\t\t\t<p>Geologist and volcanologist<\/p>\n\t\t\t\t\t\t<div>BGS Edinburgh<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/people\/engwell-samantha\/\">Find out more<\/a>\n\t\t<\/div>\n\t\t\t\n\n\t\t\t<div class=\"relatives\">\n\t\t\t\t<h5>Relative topics<\/h5>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/tag\/fieldwork\/\" class=\"button primary-background\">fieldwork<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/tag\/geological-interest\/\" class=\"button primary-background\">geological interest<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/tag\/international-geoscience\/\" class=\"button primary-background\">international<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.bgs.ac.uk\/tag\/volcanology\/\" class=\"button primary-background\">volcanology<\/a>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"<p>Volcanologist Samantha Engwell visited the Cascades in the United States to learn more about the 1980 Mount St Helens volcanic eruption. <\/p>\n","protected":false},"author":9,"featured_media":104587,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"9674,91715,74304,93057,104022,8486","_relevanssi_noindex_reason":"","footnotes":""},"categories":[58],"tags":[1387,1460,1352,1525],"purpose":[],"challenge":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - 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