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.
MHM is the acronym for âmm-hmmâ. It is used in place of yes or to show agreement with a suggestion or opinion. It is a slang and is used in informal testing. MHM is used to show agreement. What Does MHM Mean | MHM Meaning - SlangHub.com. Views Â· View Upvotes.