Records of Milne Seismograph No. 16, At Christchurch, From November, 1901.
Latitude, 43° 31′ 50′ S.; longitude, 172° 38′ 09′ E. Time employed: 11 h. 30 m. east of Greenwich.
Numbers 1, 2, … from November, 1901. Time: N.Z.S.T., as stated above. P.T., preliminary tremors less than 2 mm. complete amplitude; A.T., after-tremors less than 2 mm complete amplitude; B., E., beginning and end of vibrations not less than 2 mm.; Amp., full amplitude in millimetres; B.P., boom period; midnight, 0 h. or 24 h.
Records were commenced on this instrument on the 19th November, 1901. The instrument is erected on a brick pillar standing on a concrete foundation sunk to a depth of about 4 ft. 6 in. The concrete is of the form of a truncated pyramid of square section, the length of whose side at the bottom is 4 ft. 6 in. and on the top 1 ft. 6 in., from which rises the square [ unclear: ] sectioned brick pillar referred to. The geological formation is an alluvial plain of considerable thickness, in which are several water-bearing strata. From these the people of Christchurch derive their artesian water.
C. Coleridge Farr, Observer.