A network of eight M02 strong-motion accelerographs was established in the Hutt Valley between the years 1966-70 with a view to determining the effect of the local geology on earthquake attack on structures. The location of the instruments is shown in Fig. 1 and a typical cross-section of
the Valley in Fig. 2. The instruments
are all owned by the Physics and Engineering Laboratory (PEL), DSIR, apart from the one at the Haywards Substation, which is owned by NZED but serviced by PEL.