[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"log-post-marine-magnetic-survey-of-a-submerged-roman-harbour-caesarea-maritima-israel":3,"log-applications":135,"log-categories":158,"log-products-42":170,"log-parent-products-42":736},{"id":4,"date":5,"date_gmt":6,"guid":7,"modified":9,"modified_gmt":10,"slug":11,"status":12,"type":13,"link":14,"title":15,"content":17,"excerpt":20,"author":22,"featured_media":23,"comment_status":24,"ping_status":25,"sticky":19,"template":26,"format":27,"meta":28,"categories":29,"application":31,"class_list":34,"acf":43,"_links":88},42,"2004-03-16T14:57:46","2004-03-16T19:57:46",{"rendered":8},"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002F?p=42","2026-01-26T12:27:36","2026-01-26T17:27:36","marine-magnetic-survey-of-a-submerged-roman-harbour-caesarea-maritima-israel","publish","post","https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002F2004\u002F03\u002F16\u002Fmarine-magnetic-survey-of-a-submerged-roman-harbour-caesarea-maritima-israel\u002F",{"rendered":16},"Marine Magnetic Survey of a Submerged Roman Harbour, Caesarea Maritima, Israel",{"rendered":18,"protected":19},"\u003Ch2>Abstract\u003C\u002Fh2>\n\u003Cp>The harbour built by King Herod’s engineers at Caesarea represented a major advance in Roman harbour construction that incorporated the use of large (390 m3 ), form-filled hydraulic concrete blocks to build an extensive foundation for the harbour moles and breakwater barriers. Marine geophysical surveys were recently conducted across the submerged harbour in an attempt to map the configuration of the buried concrete foundation. A total of 107 line km of high-resolution marine magnetic surveys (nominal 15 m line separations) and bathymetry were acquired over a 1 km2 area of the submerged harbour using an Overhauser marine magnetometer, integrated DGPS and single-beam (200 KHz) echosounder. The feasibility of magnetic detection of the concrete was established before the survey by magnetic susceptibility testing of concrete core samples. All concrete samples contained appreciable amounts of fe-oxide-rich volcanic ash (‘pozzolana’) and showed uniformly high susceptibility values (κ > 10-4 cgs) when compared to harbour bottom sediments and building stones (κ < 10-6 cgs).\u003C\u002Fp>\n\u003Cp>Magnetic surveys identify a localized increase in magnetic intensity (ca. 3-10 nT) that is attributed to the presence of hydraulic concrete within the buried harbour structure. The mapped anomaly patterns are distinctly rectilinear, indicating that the concrete foundation was laid out in ‘header’ fashion in dominantly N-S and W-E trending segments. Magnetic lows identify ‘cells’ within the concrete framework that were likely backfilled with harbour sediments prior to construction of the harbour moles and quays.\u003C\u002Fp>\n\u003Ch2>Summary\u003C\u002Fh2>\n\u003Cp>This study demonstrates the utility of magnetic methods for mapping buried concrete structures in a marine archaeological setting and provides important new insights into the method of construction of Herod’s harbour. Magnetic property testing of hydraulic concrete samples shows that they are characterised by high magnetic susceptibilities and are good targets for magnetic detection. It is anticipated that the methods described here will have wider application to other Roman harbour sites where pozzolan concrete materials were employed.\u003C\u002Fp>\n\u003Cp>Magnetic mapping at Sebastos confirms that concrete structures exposed at several locations on the harbour are part of a much more extensive foundation work that underlies the entire mole structure (Fig. 8B). The interpreted magnetic anomaly patterns suggest that the two moles were established by the construction of two large rectangular ‘islets’ with concrete perimeter walls and internal compartments or ‘cells’. The compartments were either actively infilled, or acted as large baffles trapping littoral sediment through the natural processes of longshore drift.\u003C\u002Fp>\n",false,{"rendered":21,"protected":19},"\u003Cp>Abstract The harbour built by King Herod’s engineers at Caesarea represented a major advance in Roman harbour construction that incorporated the use of large (390 m3 ), form-filled hydraulic concrete blocks to build an extensive foundation for the harbour moles and breakwater barriers. Marine geophysical surveys were recently conducted across the submerged harbour in an […]\u003C\u002Fp>\n",1,0,"closed","open","","standard",{"_acf_changed":19,"inline_featured_image":19,"footnotes":26},[30],12,[32,33],17,19,[35,13,36,37,38,39,40,41,42],"post-42","type-post","status-publish","format-standard","hentry","category-research","application-archeology","application-geophysical-exploration",{"external_link":26,"hero_media":44,"credits":84,"related_products":85},{"width":45,"height":46,"file":47,"filesize":48,"sizes":49,"image_meta":79,"id":82,"url":83},1248,832,"2025\u002F04\u002FMarine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel.png",2409156,{"medium":50,"large":57,"thumbnail":63,"medium_large":68,"chip":74},{"file":51,"width":52,"height":53,"mime-type":54,"filesize":55,"url":56},"Marine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-300x200.png",300,200,"image\u002Fpng",138795,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F04\u002FMarine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-300x200.png",{"file":58,"width":59,"height":60,"mime-type":54,"filesize":61,"url":62},"Marine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-1024x683.png",1024,683,1648471,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F04\u002FMarine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-1024x683.png",{"file":64,"width":65,"height":65,"mime-type":54,"filesize":66,"url":67},"Marine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-150x150.png",150,52226,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F04\u002FMarine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-150x150.png",{"file":69,"width":70,"height":71,"mime-type":54,"filesize":72,"url":73},"Marine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-768x512.png",768,512,942294,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F04\u002FMarine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-768x512.png",{"file":75,"width":76,"height":76,"mime-type":54,"filesize":77,"url":78},"Marine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-100x100.png",100,23375,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F04\u002FMarine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel-100x100.png",{"aperture":80,"credit":26,"camera":26,"caption":26,"created_timestamp":80,"copyright":26,"focal_length":80,"iso":80,"shutter_speed":80,"title":26,"orientation":80,"keywords":81},"0",[],820,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F04\u002FMarine-Magnetic-Survey-of-a-Submerged-Roman-Harbour-Caesarea-Maritima-Israel.png","\u003Cp>Originally published in \u003Ca href=\"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F11\u002FMarine-Magnetic-Survey-Nautical-Archaeology.pdf\">The International Journal of Nautical Archaeology, Volume 33, Issue 1\u003C\u002Fa> (2004).\u003Cbr data-start=\"191\" data-end=\"194\" \u002F>Written by Joseph I. Boyce, Eduard G. Reinhardt, Avner Raban, and Matthew R. 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Stable Design\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Resists snags and minimizes impacts. The polyurethane coated tail with molded fins acts as a bumper, while creating a stable towing platform.\u003C\u002Fp>\n",{"image":604,"description":629},{"width":46,"height":46,"file":605,"filesize":606,"sizes":607,"image_meta":625,"id":627,"url":628},"2025\u002F09\u002FFeature-Sensor.png",403849,{"medium":608,"thumbnail":612,"medium_large":616,"profile-image":620},{"file":609,"width":52,"height":52,"mime-type":54,"filesize":610,"url":611},"Feature-Sensor-300x300.png",67665,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FFeature-Sensor-300x300.png",{"file":613,"width":65,"height":65,"mime-type":54,"filesize":614,"url":615},"Feature-Sensor-150x150.png",20581,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FFeature-Sensor-150x150.png",{"file":617,"width":70,"height":70,"mime-type":54,"filesize":618,"url":619},"Feature-Sensor-768x768.png",402874,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FFeature-Sensor-768x768.png",{"file":621,"width":622,"height":622,"mime-type":54,"filesize":623,"url":624},"Feature-Sensor-400x400.png",400,115799,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FFeature-Sensor-400x400.png",{"aperture":80,"credit":26,"camera":26,"caption":26,"created_timestamp":80,"copyright":26,"focal_length":80,"iso":80,"shutter_speed":80,"title":26,"orientation":80,"keywords":626},[],278,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FFeature-Sensor.png","\u003Cp>\u003Cstrong>Quick Glance Diagnostics\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Automatic power supply cutoff, and leak detection give you plenty of time to pull the mag before damage.\u003C\u002Fp>\n",[631,634,637,639,641,643,645,647,649,651,653,655,659,661,665,667,669,671,675,677,679,681,684,686],{"acf_fc_layout":632,"header":633},"section_header","Size + Weight",{"acf_fc_layout":635,"content":636},"wysiwyg","\u003Cp>\u003Cimg decoding=\"async\" class=\"alignnone size-full wp-image-210\" src=\"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FTech-SeaSpy.svg\" alt=\"\" \u002F>\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Magnetometer\u003Cbr \u002F>\n\u003C\u002Fstrong>Length: 119 cm\u003Cbr \u002F>\nDiameter: 7.6 cm\u003Cbr \u002F>\nWeight in air: 12 kg\u003Cbr \u002F>\nWeight in water: 3.5 kg\u003C\u002Fp>\n\u003Cp>\u003Cstrong>With Altimeter\u003Cbr \u002F>\n\u003C\u002Fstrong>Weight in air: 12.8 kg\u003Cbr \u002F>\nWeight in water: 4 kg with altimeter\u003Cstrong>\u003Cbr \u002F>\n\u003C\u002Fstrong>\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":638},"Sensor",{"acf_fc_layout":635,"content":640},"\u003Cp>\u003Cimg loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1067 size-medium\" src=\"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002Fcustom\u002Fuploads\u002F2026\u002F05\u002FOverhauser.svg\" alt=\"\" width=\"300\" height=\"300\" \u002F>\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Tuned Overhauser\u2028for absolute accuracy\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Operating Zones: Worldwide\u003Cbr \u002F>\nMeasurement Type: Scalar\u003C\u002Fp>\n\u003Cp>Absolute Accuracy: 0.1 nT\u003Cbr \u002F>\nSensitivity: 0.01 nT (0.02 nT optional)\u003Cbr \u002F>\nCounter Sensitivity: 0.001 nT\u003Cbr \u002F>\nResolution: 0.001 nT\u003Cbr \u002F>\nDead Zone: NONE\u003Cbr \u002F>\nHeading Error: NONE\u003Cbr \u002F>\nTemperature Drift: NONE\u003Cbr \u002F>\nGradient Tolerance: Over 10,000 nT\u002Fm\u003Cbr \u002F>\nRange: 18,000 nT to 120,000 nT\u003Cbr \u002F>\nSampling Rates: 4 Hz – 0.1 Hz\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":642},"Operation",{"acf_fc_layout":635,"content":644},"\u003Cp>Depths ratings: 1000m, 3000m, 6000m\u003Cbr \u002F>\nPower Consumption: 1 W standby, 3 W maximum (+2 W with altimeter)\u003Cbr \u002F>\nPower Supply: 24VDC (120-240 VAC compatible) (Acceptable range 9-30 VDC)\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":646},"Data",{"acf_fc_layout":635,"content":648},"\u003Cp>Communication: RS-232, 9600 bps\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":650},"System",{"acf_fc_layout":635,"content":652},"\u003Cp>\u003Cstrong>Integrated\u003Cbr \u002F>\n\u003C\u002Fstrong>Electronics module with Larmour counter\u003Cbr \u002F>\nLeak Detector\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Optional:\u003C\u002Fstrong> Pressure sensor, Altimeter\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":654},"Cable Options",{"acf_fc_layout":656,"left_column":657,"right_column":658},"two_column","\u003Cp>\u003Cimg loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1245\" src=\"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2026\u002F05\u002FA-TowCable.svg\" alt=\"\" width=\"300\" height=\"300\" \u002F>\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Standard Tow Cable\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Conductor: Twisted pair (2)\u003Cbr \u002F>\nStrength Member: Vectran Braid\u003Cbr \u002F>\nBreaking Strength: 2,700 kg\u003Cbr \u002F>\nWorking Load: 450 kg\u003Cbr \u002F>\nOuter Diameter: 10.4 mm\u003Cbr \u002F>\nWeight in Air: 120 g\u002Fm\u003Cbr \u002F>\nWeight in Water: 30 g\u002Fm\u003Cbr \u002F>\nCable Termination: Field Replaceable\u003Cbr \u002F>\nData interface: FSK\u003Cbr \u002F>\nMaterial: Yellow PU\u003Cbr \u002F>\nIdeal for: Heavy duty towing over FSK\u003C\u002Fp>\n","\u003Cp>\u003Cimg loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1161\" src=\"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2026\u002F05\u002FB-Cable-Float.svg\" alt=\"\" width=\"300\" height=\"300\" \u002F>\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Flotation Tow Cable\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Conductor: Twisted Pair (2)\u003Cbr \u002F>\nStrength Member: Vectran Braid\u003Cbr \u002F>\nBreaking Strength: 2,700 kg\u003Cbr \u002F>\nWorking Load: 450 kg\u003Cbr \u002F>\nOuter Diameter: 19.1 mm\u003Cbr \u002F>\nWeight in Air: 285 g\u002Fm\u003Cbr \u002F>\nWeight in Water: -9 g\u002Fm\u003Cbr \u002F>\nCable Termination: Field Replaceable\u003Cbr \u002F>\nData interface: FSK\u003Cbr \u002F>\nMaterial: Orange PU\u003Cbr \u002F>\nIdeal for: Shallow water towing, SSS towing\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":660},"Software",{"acf_fc_layout":662,"software":663},"software",[664],182,{"acf_fc_layout":635,"content":666},"\u003Cp>\u003Cstrong>Other compatible software:\u003C\u002Fstrong> Hypack, Geosoft, Golden software, Seebyte, Fugro, Teledyne, Chesapeake Technology, Organic Imaging Consultants\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":668},"Required Accessories",{"acf_fc_layout":635,"content":670},"\u003Cp>\u003Cimg decoding=\"async\" class=\"alignnone size-full wp-image-205\" src=\"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FTech-Case-Reusable.svg\" alt=\"\" \u002F>\u003Cimg decoding=\"async\" class=\"alignnone size-full wp-image-195\" src=\"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FTech-Cable-Batteryclip.svg\" alt=\"\" \u002F> \u003Cimg decoding=\"async\" class=\"alignnone size-full wp-image-209\" src=\"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FTech-Power-Universal.svg\" alt=\"\" \u002F>\u003Cimg decoding=\"async\" class=\"alignnone size-full wp-image-226\" src=\"https:\u002F\u002Fdev2.hypelabs.dev\u002Fmarine\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F09\u002FTech-USB.svg\" alt=\"\" \u002F>\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Reusable Shipping Case\u003C\u002Fstrong>\u003Cbr \u002F>\nLength: 1.4 m, Width: 28 cm, Height: 28 cm\u003Cbr \u002F>\nShipping weight: 28.2 kg\u003C\u002Fp>\n\u003Cp>\u003Cstrong>More\u003Cbr \u002F>\n\u003C\u002Fstrong>24V Universal AC Power Supply or Battery Clip Cable\u003Cbr \u002F>\nCharging Cable: Male 8-pin Subconn Inline Micro Circular Connector\u003Cbr \u002F>\nUSB or RS232 Cable\u003C\u002Fp>\n",{"acf_fc_layout":672,"related_accessories":673},"accessories",[674],282,{"acf_fc_layout":632,"header":676},"Add-ons",{"acf_fc_layout":635,"content":678},"\u003Cp>\u003Cstrong>Optional:\u003C\u002Fstrong> Deck Leader Cable (30 m customizable), Tow termination kit, Hand-Cranked Reel\u003C\u002Fp>\n",{"acf_fc_layout":632,"header":680},"Optional Accessories",{"acf_fc_layout":672,"related_accessories":682},[683],285,{"acf_fc_layout":632,"header":685},"Downloads",{"acf_fc_layout":687,"files":688},"files",[689,695,701],{"title":690,"file":691},"SeaSPY2 Brochure",{"filesize":692,"id":693,"url":694},163525,719,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F05\u002FMM_Brochure_202511_SPY.pdf",{"title":696,"file":697},"SeaSPY2 Operation Manual",{"filesize":698,"id":699,"url":700},2889730,991,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F05\u002FSeaSPY2-Operation-Manual-2026-02.pdf",{"title":702,"file":703},"Firmware Update Instructions",{"filesize":704,"id":705,"url":706},353301,710,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F05\u002FFirmware-Update-Instructions-2024-08.pdf",[708,709,710,4,711,712,713,714],46,567,34,40,785,766,38,{"id":86,"slug":716,"title":717,"parent":23,"menu_order":719,"acf":720},"seaspy",{"rendered":718},"SeaSPY",2,{"engineering_name":721,"card_title":718,"card_description":722,"tagline":723,"hero_media":724,"description":734},"Marine Magnetometer","\u003Cp>Workhorse without deadzones or heading errors.\u003C\u002Fp>\n","Plan Your Survey. Not Your Sensor.",{"bitrate":725,"filesize":726,"mime_type":727,"length":728,"length_formatted":729,"width":177,"height":178,"fileformat":730,"dataformat":731,"id":732,"url":733},13670877,4897592,"video\u002Fwebm",3,"0:03","webm","V_AV1",1075,"https:\u002F\u002Fmarinemagnetics.com\u002Fcms\u002Fcustom\u002Fuploads\u002F2025\u002F04\u002FSeaSPY2-Deck-trim.av1_.webm",{"flavour":26,"text":735},"\u003Cp>You know what’s better than a well-worn survey setup routine?\u003Cbr \u002F>\nNo survey setup routine.\u003C\u002Fp>\n\u003Cp>Warm-up, gas cells, and line planning around dead zones aren’t endemic to magnetometry. Just cesium.\u003C\u002Fp>\n",[]]