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.
SEISMIC WAVES. Two basic types of elastic waves or seismic waves are generated by an. earthquake; these are body waves and surface waves. These waves cause. shaking that is felt, and cause damage in various ways. These waves are similar. in many important ways to the familiar waves in air generated by a hand-clap or.