{"id":2339,"date":"2025-11-26T01:55:06","date_gmt":"2025-11-26T01:55:06","guid":{"rendered":"https:\/\/www.waterland.com.hk\/?p=2339"},"modified":"2025-11-26T05:11:18","modified_gmt":"2025-11-26T05:11:18","slug":"geophysical-survey","status":"publish","type":"post","link":"https:\/\/www.waterland.com.hk\/?p=2339","title":{"rendered":"Geophysical Survey"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Multi-Channel Analysis Surface Wave (MASW) Survey<\/strong><\/h2>\n\n\n\n<p>Our MASW survey employs trenchless geophysical technology, providing an efficient alternative to traditional drilling and trenching for site investigation. This non-destructive method is particularly advantageous in urban areas, minimising surface disruption while delivering detailed insights into subsurface conditions.<\/p>\n\n\n\n<p>MASW measures seismic surface waves mainly from&nbsp;<em><strong>2 types of seismic sources<\/strong><\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Active Mode:\n<ul class=\"wp-block-list\">\n<li>Source generated by hammers or weight droppers on ground<\/li>\n\n\n\n<li>Survey depth is within 30m<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Passive Mode:\n<ul class=\"wp-block-list\">\n<li>Source obtained by \u201dambient noise\u201d \u2013 such as trucks or construction activities<\/li>\n\n\n\n<li>Survey depth from 30m to 120m<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Applications of the MASW Survey:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Identification of subsurface layers<\/li>\n\n\n\n<li>Location of deep obstructions<\/li>\n\n\n\n<li>3D visualization of boulders and rock head profiles<\/li>\n\n\n\n<li>Void detection beneath high water levels<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"606\" height=\"362\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-22.png\" alt=\"\" class=\"wp-image-2362\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-22.png 606w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-22-300x179.png 300w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/><\/figure>\n\n\n\n<p>Refer to the link below for the MASW Brochure<\/p>\n\n\n\n<p><a href=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/MASW-Seismic-Survey.pdf\">https:\/\/www.waterland.com.hk\/wp-content\/uploads\/MASW-Seismic-Survey.pdf<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Borehole PS Suspension Logging Geophysical Survey<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"646\" height=\"220\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/photo-1.png\" alt=\"\" class=\"wp-image-2198\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/photo-1.png 646w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/photo-1-300x102.png 300w\" sizes=\"(max-width: 646px) 100vw, 646px\" \/><\/figure>\n\n\n\n<p>The PS Logger is a tool used to measure how fast seismic waves (P and S waves) travel through the ground in a borehole (a narrow, deep hole drilled into the earth). These measurements are important because they help engineers understand the stiffness of soil and rock, particularly for projects such as offshore wind farms or large-scale construction projects.<br><br>In borehole PS suspension logging, a fluid-filled borehole is used to transmit seismic waves generated by a PS Logger tool. The tool\u2019s dipole source creates low-frequency waves, and two receivers measure the travel times of P- and S-waves through the surrounding soil or rock. These wave speeds are used to calculate soil stiffness (Gmax) and other material properties critical for geotechnical projects.<br><br>The importance of the PS logger works well in soft soil and underwater environments, where other methods might fail.<br>Calculates Gmax, which helps identify how soil or rock reacts to vibrations or waves.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" width=\"799\" height=\"344\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/photo-2.jpg\" alt=\"\" class=\"wp-image-2346\" style=\"width:629px;height:auto\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/photo-2.jpg 799w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/photo-2-300x129.jpg 300w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/photo-2-768x331.jpg 768w\" sizes=\"(max-width: 799px) 100vw, 799px\" \/><\/figure>\n\n\n\n<p>Refer to the link below for the PS Suspension Logging Brochure<\/p>\n\n\n\n<p><a href=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/brochure_PS-logging-v1.pdf\">https:\/\/www.waterland.com.hk\/wp-content\/uploads\/brochure_PS-logging-v1.pdf<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Multi-convey 3D radar<\/strong><\/h2>\n\n\n\n<p>Multi\u2011Convey 3D Radar is an advanced ground\u2011penetrating radar (GPR) service designed to capture high\u2011resolution, three\u2011dimensional images of subsurface features. Using multiple radar channels and rapid data collection, this system provides detailed mapping of underground utilities, structures, voids, and geological conditions. The technology delivers accurate depth information and clear visualisation of complex subsurface environments, supporting safer planning, excavation, and engineering design.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"886\" height=\"542\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-28.png\" alt=\"\" class=\"wp-image-2372\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-28.png 886w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-28-300x184.png 300w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-28-768x470.png 768w\" sizes=\"(max-width: 886px) 100vw, 886px\" \/><\/figure>\n\n\n\n<p><strong>Key Benefits<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Provides high\u2011resolution, 3D subsurface imaging for accurate mapping<\/li>\n\n\n\n<li>Reduces excavation risk by identifying underground utilities, voids, and structures<\/li>\n\n\n\n<li>Improves project planning and safety with reliable, data\u2011rich results<\/li>\n\n\n\n<li>Increases survey efficiency by covering large areas quickly<\/li>\n\n\n\n<li>Minimizes the need for intrusive or destructive investigation methods<\/li>\n<\/ul>\n\n\n\n<p><strong>Key Features<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Multi\u2011channel antenna system for detailed, three\u2011dimensional data capture<\/li>\n\n\n\n<li>Rapid data acquisition with high spatial accuracy<\/li>\n\n\n\n<li>Detects both shallow and deeper subsurface anomalies<\/li>\n\n\n\n<li>Suitable for a wide range of environments, including construction, engineering, and utility projects<\/li>\n\n\n\n<li>Produces clear visual outputs for easy interpretation and reporting<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"877\" height=\"237\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-29.png\" alt=\"\" class=\"wp-image-2374\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-29.png 877w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-29-300x81.png 300w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-29-768x208.png 768w\" sizes=\"(max-width: 877px) 100vw, 877px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Borehole GPR<\/h2>\n\n\n\n<p>Borehole Radar uses a ground\u2011penetrating radar antenna inside a borehole to detect reflections from subsurface structures, helping determine the depth and shape of foundations. The method works by transmitting radar waves into the surrounding ground and recording reflections from materials with different dielectric properties. It operates in reflection mode, with penetration depth depending on frequency and ground conductivity\u2014lower frequencies reach deeper but provide lower resolution.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"709\" height=\"384\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-17.png\" alt=\"\" class=\"wp-image-2350\" style=\"width:704px;height:auto\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-17.png 709w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-17-300x162.png 300w\" sizes=\"(max-width: 709px) 100vw, 709px\" \/><\/figure>\n\n\n\n<p>In foundation\u2011depth investigations, borehole radar records reflections from the foundation until its base is reached, where reflections cease except for those from natural geological layers. This change in signal indicates the foundation bottom. The method requires a PVC\u2011cased borehole and is limited by the electrical conductivity of surrounding soils, with penetration up to about 10 m in resistive ground and much less in conductive materials, making close borehole placement important.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"672\" height=\"708\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-16.png\" alt=\"\" class=\"wp-image-2349\" style=\"width:472px;height:auto\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-16.png 672w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-16-285x300.png 285w\" sizes=\"(max-width: 672px) 100vw, 672px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">UXO Survey<\/h2>\n\n\n\n<p>UXO (Unexploded Ordnance) surveying is a specialised safety service designed to identify and assess potential explosive hazards left behind from historical military activities or previous land use. Using advanced detection technologies, our team locates buried metallic objects and evaluates their risk, ensuring the site is safe for construction, excavation, and development. This service provides clients with confidence and compliance, supporting safe and efficient project planning.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-18.png\" alt=\"\" class=\"wp-image-2353\" style=\"width:523px;height:auto\" srcset=\"https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-18.png 1024w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-18-300x300.png 300w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-18-150x150.png 150w, https:\/\/www.waterland.com.hk\/wp-content\/uploads\/image-18-768x768.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>UXO surveys provide a reliable and efficient way to identify potential unexploded ordnance hazards before construction or ground disturbance begins. Using advanced geophysical detection methods, they help ensure site safety, reduce project risk, and prevent costly delays. Key benefits include improved worker safety, compliance with regulatory requirements, accurate detection of buried metallic objects, and greater confidence in project planning and development.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Multi-Channel Analysis Surface Wave (MASW) Survey Our MASW survey employs trenchless geophysical technology, providing an efficient alternative to traditional drilling and trenching for site investigation. This non-destructive method is particularly advantageous in urban areas, minimising surface disruption while delivering detailed insights into subsurface conditions. MASW measures seismic surface waves mainly from&nbsp;2 types of seismic sources [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2375,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31],"tags":[],"class_list":["post-2339","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-detection-survey-waterland-detection-engineering-limited"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=\/wp\/v2\/posts\/2339"}],"collection":[{"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2339"}],"version-history":[{"count":5,"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=\/wp\/v2\/posts\/2339\/revisions"}],"predecessor-version":[{"id":2376,"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=\/wp\/v2\/posts\/2339\/revisions\/2376"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=\/wp\/v2\/media\/2375"}],"wp:attachment":[{"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.waterland.com.hk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}