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Strong-Motion Data
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.
Etna accelerograph.
Instrumentation
New Zealand's current strong-motion network is instrumented with:
- Kinemetrics Etna accelerographs in the National Strong Ground Motion Network.
- CSI CUSP-3 instruments in the Canterbury regional strong-motion network.
- CSI CUSP-M instruments in structures and buildings.
Raw data
Raw data files are available from ftp.geonet.org.nz/strong/raw, 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.
Manufacturer's software
Software and guides for manipulating and decoding raw data are available from the manufacturers:
Processed data
The entire New Zealand collection of processed strong-motion data is available from ftp.geonet.org.nz/strong/processed/Proc. It includes accelerograms and response spectra from both current and obsolete recorders. Data files are in ASCII format, and relevant documentation for decoding the files and descriptions of site conditions may be found in ftp.geonet.org.nz/strong/processed/Docs.
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.
