{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T18:43:15Z","timestamp":1765478595778,"version":"3.48.0"},"reference-count":8,"publisher":"Society of Exploration Geophysicists","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2006,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Magnetometric resistivity (MMR) is an electromagnetic (EM) exploration method that has been used successfully to investigate electrical-resistivity structures below the sea-floor. Apparent resistivity, derived from the observed azimuthal component of the magnetic field, often is used as an approximation to the resistivity of a layered earth. Two commonly used formulas to compute the apparent resistivity have their own limitations and are invalid for a deep-sea experiment. In this paper, we derive an apparent-resistivity formula based upon the magnetic field resulting from a semi-infinite electrode buried in a 1D layered earth. This new formula can be applied to both shallow and deep marine MMR surveys. In addition, we address the effects that arise from the transmitter-receiver (Tx-Rx) depth difference and the choice of the normalized range (the radial distance between transmitter and receiver, divided by the thickness of seawater) on data interpretation and survey design. The performance of the new formula is shown by processing synthetic and field data.<\/jats:p>","DOI":"10.1190\/1.2194513","type":"journal-article","created":{"date-parts":[[2006,6,9]],"date-time":"2006-06-09T19:13:16Z","timestamp":1149880396000},"page":"G73-G81","source":"Crossref","is-referenced-by-count":0,"title":["A new formula to compute apparent resistivities from marine magnetometric resistivity data"],"prefix":"10.1190","volume":"71","author":[{"given":"Jiuping","family":"Chen","sequence":"first","affiliation":[{"name":"1Formerly University of British Columbia, Vancouver, Canada: presently Schlumberger-EMI Technology Center, 1301 South 46 Street, Building 300, Richmond, California 94804. E-mail: jchen16@slb.com."}]},{"given":"Douglas W.","family":"Oldenburg","sequence":"additional","affiliation":[{"name":"2University of British Columbia, Department of Earth and Ocean Sciences, 6339 Stores Road, Vancouver, British Columbia, Canada. E-mail: doug@eos.ubc.ca."}]}],"member":"186","published-online":{"date-parts":[[2006,5,19]]},"reference":[{"key":"2025121113393642000_R1","first-page":"931","article-title":"Electrical exploration methods for the seafloor","author":"Chave","year":"1991"},{"key":"2025121113393642000_R2","doi-asserted-by":"crossref","first-page":"679","DOI":"10.1046\/j.1365-246X.2002.01688.x","article-title":"Three-dimensional numerical modeling and inversion of magnetometric resistivity data","volume":"149","author":"Chen","year":"2002","journal-title":"Geophysical Journal International"},{"key":"2025121113393642000_R3","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1071\/EG04157","article-title":"Magnetic and electric fields of direct currents in a layered earth","volume":"35","author":"Chen","year":"2004","journal-title":"Exploration Geophysics"},{"key":"2025121113393642000_R4","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1190\/1.1441825","article-title":"First results of the MOSES experiment: Sea sediment conductivity and thickness determination, Bute Inlet, British Columbia, by magnetometric offshore electrical sounding","volume":"50","author":"Edwards","year":"1985","journal-title":"Geophysics"},{"key":"2025121113393642000_R5","first-page":"47","article-title":"The magnetometric resistivity method","author":"Edwards","year":"1991"},{"key":"2025121113393642000_R6","doi-asserted-by":"crossref","first-page":"10.1029\/2001-GL014106","DOI":"10.1029\/2001GL014106","article-title":"Crustal resistivity structure at 9\u00b0 50\u2032N on the East Pacific Rise: Results of an electromagnetic survey","volume":"29","author":"Evans","year":"2002","journal-title":"Geophysical Research Letters"},{"key":"2025121113393642000_R7","doi-asserted-by":"crossref","first-page":"12321","DOI":"10.1029\/98JB00599","article-title":"Hydrothermal circulation at the cleft-vance overlapping spreading center: Results of a magnetometric resistivity survey","volume":"103","author":"Evans","year":"1998","journal-title":"Journal of Geophysical Research"},{"key":"2025121113393642000_R8","doi-asserted-by":"crossref","first-page":"1808","DOI":"10.1190\/1.1442227","article-title":"Polymetallic sulfide exploration on the deep sea floor: The feasibility of the MINI-MOSES technique","volume":"51","author":"Wolfgram","year":"1986","journal-title":"Geophysics"}],"container-title":["Geophysics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.geoscienceworld.org\/seg\/geophysics\/article-pdf\/71\/3\/G73\/3209129\/gsgpy_71_3_G73.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.geoscienceworld.org\/seg\/geophysics\/article-pdf\/71\/3\/G73\/3209129\/gsgpy_71_3_G73.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T18:39:46Z","timestamp":1765478386000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.geoscienceworld.org\/geophysics\/article\/71\/3\/G73\/274048\/A-new-formula-to-compute-apparent-resistivities"},"secondary":[{"URL":"http:\/\/geophysics.geoscienceworld.org\/cgi\/doi\/10.1190\/1.2194513","label":"geoscienceworld"}]},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2006,1,1]]},"references-count":8,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2006,1,1]]}},"URL":"https:\/\/doi.org\/10.1190\/1.2194513","relation":{},"ISSN":["1942-2156","0016-8033"],"issn-type":[{"type":"electronic","value":"1942-2156"},{"type":"print","value":"0016-8033"}],"subject":[],"published-other":{"date-parts":[[2006]]},"published":{"date-parts":[[2006,1,1]]}}}