The symmetrical triaxial seismometer is one in which the orthogonal directions of response form equal angles of about 55 degrees with the vertical. The symmetrical design facilitates matching the response of the three elements, and in the long-period configuration minimizes some problems encountered from variations in the natural period caused by local tilting of the earth. A compact design suited to installation in a cased hole is feasible, which in turn permits more widespread application and allows reduction of localized, non-propagating surface noise and tilts.

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