There are two types of body waves: compressional (P) waves and shear (S) waves. Primary waves (P-waves) travel the fastest, so they arrive at the recording station (seismograph) first. Secondary or shear waves (S-waves) travel slower than P-waves so they arrive second.
Modified frequency modulation (MFM) is an encoding scheme used by PC floppy disk drives and older hard drives.
Definition of MF in the AudioEnglish.org Dictionary. Meaning of MF. What does MF mean? Proper usage of the word MF. Information about MF in the AudioEnglish.org dictionary, synonyms and antonyms. English for Beginners Practical English Travel English Telephone English Banking English Accounting English Dictionary courses dictionary