The Microtremor Survey Method

Among geophysical methods, there are many techniques which use the “natural field,” “natural signal,” or “natural phenomena.” For example, they include the gravity survey method, the magnetic survey method, the spontaneous potential (SP) measurement in electrical methods, the magnetotelluric method in the electromagnetic methods, and radiometric measurements (Dobrin and Savit, 1988; SEGJ, 1989). These are known as “natural field methods.” These survey methods have been initiated, researched, and developed as means of understanding geological structure by measurement of the respective physical property. They are presently used in their own right or to augment other survey methods, but typically they are…