{"id":424,"date":"2020-03-22T10:01:34","date_gmt":"2020-03-22T10:01:34","guid":{"rendered":"https:\/\/www.smarttomo.com\/wp\/?p=424"},"modified":"2020-08-17T21:05:17","modified_gmt":"2020-08-17T21:05:17","slug":"case-study-detection-of-a-tunnel-seismic-tomography","status":"publish","type":"post","link":"https:\/\/www.smarttomo.com\/wp\/news\/case-study-detection-of-a-tunnel-seismic-tomography\/","title":{"rendered":"Case study &#8211; Detection of a tunnel."},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">In this work, seismic refraction tomography (SRT) was performed to investigate the characteristics of the subsoil and to investigate the evidence of the presence of a tunnel used for the carrying of water. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_isolines_filled_tunnel_detection-1024x572.png\" alt=\"\" class=\"wp-image-386\" srcset=\"https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_isolines_filled_tunnel_detection-1024x572.png 1024w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_isolines_filled_tunnel_detection-300x168.png 300w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_isolines_filled_tunnel_detection-768x429.png 768w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_isolines_filled_tunnel_detection-1536x858.png 1536w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_isolines_filled_tunnel_detection-2048x1145.png 2048w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><figcaption>Tomographic profile showing an anomaly in seismic velocity<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The survey was carried out using 24 vertical geophones and performing a high number of vertical energizations both inside and outside the line, in order to have a good coverage by seismic rays throughout the section. <\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">A tunnel can be better detected if the seismic line is deployed perpendicular to that, as it will be represented by a localised speed anomaly. On the contrary, in case of parallelism between the structure and seismic line, the tunnel will be displayed as a horizontal layer easily confused with the rock layering.   <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SmartTomo implements a refracted data processing methodology based on the path of the fastest seismic rays, the tunnel can be identified in two ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>as a negative anomaly if the seismic rays traveling around the cavity take longer than normal;<\/li><li> as a positive anomaly, if the tunnel lining is faster than the surrounding materials and the seismic rays take less time to reach the geophones. <\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, there may also be a case in which the first arrivals are not disturbed by the presence of the tunnel and the object is not detectable. For these eventualities it is better to use different and more suitable methods of investigation such as GPR, electric tomography or gravimetry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the study analyzed here, the tomographic section in compression waves highlights a positive speed anomaly that may correspond to the tunnel we are looking for. The anomaly is very well highlighted by the profile of the Laplacian gradient.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We thank Dr. A.Saputo for the data and processing presented in this post.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_laplacian_isolines_tunnel_detection-1024x572.png\" alt=\"\" class=\"wp-image-388\" srcset=\"https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_laplacian_isolines_tunnel_detection-1024x572.png 1024w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_laplacian_isolines_tunnel_detection-300x168.png 300w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_laplacian_isolines_tunnel_detection-768x429.png 768w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_laplacian_isolines_tunnel_detection-1536x858.png 1536w, https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_laplacian_isolines_tunnel_detection.png 1920w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">External link<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sheehan, Jacob &amp; Doll, William &amp; Watson, David &amp; Mandell, Wayne. (2005). Application of Seismic Refraction Tomography to Karst Cavities.  (<a href=\"https:\/\/www.researchgate.net\/profile\/David_Watson17\/publication\/268325512_Application_of_Seismic_Refraction_Tomography_to_Karst_Cavities\/links\/548097680cf263ee1adf9f47\/Application-of-Seismic-Refraction-Tomography-to-Karst-Cavities.pdf\">link<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this work, seismic refraction tomography (SRT) was performed to investigate the characteristics of the subsoil and to investigate the evidence of the presence of a tunnel used for the carrying of water. The survey was carried out using 24 vertical geophones and performing a high number of vertical energizations both inside and outside the &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.smarttomo.com\/wp\/news\/case-study-detection-of-a-tunnel-seismic-tomography\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Case study &#8211; Detection of a tunnel.&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51,18],"tags":[48,35],"class_list":["post-424","post","type-post","status-publish","format-standard","hentry","category-case-study","category-news","tag-case-study","tag-seismic-refraction-tomography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Case study - Detection of a tunnel. - smartTomo - Software for seismic refraction tomography<\/title>\n<meta name=\"description\" content=\"This case study presents the processing of a refraction seismic tomography for the detection of a tunnel using the smartTomo software.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.smarttomo.com\/wp\/news\/case-study-detection-of-a-tunnel-seismic-tomography\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Case study - Detection of a tunnel. - smartTomo - Software for seismic refraction tomography\" \/>\n<meta property=\"og:description\" content=\"This case study presents the processing of a refraction seismic tomography for the detection of a tunnel using the smartTomo software.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.smarttomo.com\/wp\/news\/case-study-detection-of-a-tunnel-seismic-tomography\/\" \/>\n<meta property=\"og:site_name\" content=\"smartTomo - imaging the subsurface of the Earth\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/smartTomography\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-03-22T10:01:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-08-17T21:05:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.smarttomo.com\/wp\/wp-content\/uploads\/2020\/02\/Figure_profile_isolines_filled_tunnel_detection-1024x572.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.smarttomo.com\\\/wp\\\/news\\\/case-study-detection-of-a-tunnel-seismic-tomography\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.smarttomo.com\\\/wp\\\/news\\\/case-study-detection-of-a-tunnel-seismic-tomography\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/www.smarttomo.com\\\/wp\\\/#\\\/schema\\\/person\\\/c8b4eed6d3dfafaec2ad22dcbd8912c8\"},\"headline\":\"Case study &#8211; 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