Most recommendations agree that the best coupling can be achieved by burying the
transducer when the measurement surface consists of soil and by bolting when the
measurement surface consists of rock or concrete. Burial is desirable for particle acceleration
exceeding 0.2 g but it is essential if it is greater than 1.0 g (Dowding, 1992; Stagg and Engler,
1980; ISEE, 2005).