a group of persons, as employees, charged with carrying out the work of an establishment or executing some undertaking. a group of assistants to a manager, superintendent, or executive. a member of a staff.
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. They are the energy that travels through the earth and is recorded on seismographs. Types of Seismic Waves. There are several different kinds of seismic waves, and they all move in different ways.
Rajan D. Advertisements: Earthquake waves are also called seismic waves. These waves are of three types. These are: 1. Primary or P waves are push and pull waves. They are also called longitudinal waves. These waves resemble sound waves, since both are compression-dilatation or compression rarefaction waves.