Susceptibility 1 (seismic) : A measure of the degree to which a rock can be magnetized. It is defined as the ratio (k) of the intensity of magnetization (I) to the magnetic field (H) projected into the rock
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}