A Discussion on the measurement and interpretation of changes of strain in the Earth - Strain measurement instrumentation and technique

Abstract

Methods of measuring strain in the Earth’s surface are reviewed briefly. An important aspect of strain measurement which is often overlooked is the effect on the measurement of the environment in which the strainmeter is sited. The site is shown in certain cases to have an important influence on measured strain. The effects of elastic inhomogeneity near a strainmeter are examined including the effects of underground cavity or fissure geometry. Records showing the effects of site inhomogeneity are presented.