Strong-motion accelerographs are located in major centres of population, near significant faults, or in different types of building structures. They are capable of measuring very strong shaking associated with damaging earthquakes.

Processed strong-motion data


The entire New Zealand collection of processed strong-motion data is available from:

or you may just wish to view the summary spreadsheets.

It includes accelerograms and response spectra from both current and obsolete recorders. Description of their processing and formats are to be found at: 

Descriptions of site conditions may be found in subsurface information.xls.

Worldwide strong-motion data resources are centralised at the COSMOS Virtual Data Center. This gives access to a database of strong ground motion data parameters, and links to the data centres and web sites of the contributing agencies.

Strong-motion instrumentation

New Zealand's current strong-motion network is instrumented with:

Raw data files from strong-motion recorders

Raw data files are available from, specifically:

Data are organised into yearly directories, and within each year into ordinal date directories. The four-character station codes may be viewed on the network maps, and the site locations and operational dates may be found in DELTA. The data holdings are updated every hour with recent files received from our network. Please note that they may include data from non-seismic sources, such as bumps and electrical interference.

Links to manufacturer's software for strong-motion recorders

Software and guides for manipulating and decoding raw data are available from the manufacturers:


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