Strong motion arrays for civil structures

August 11

Instrumentation ideas

Our latest surface strong motion instrument, the 5T Compact, is a full three-component sensor housed in a case about the size of a standard CD.

The well-regarded original design 5T is also available. This instrument can also be fitted with an internal DM24 digitizer module to form the 5TD. The 5TD offers support for high sample rates and low latency data transmission, as well as direct data download over FireWire. At-a-glance status information is available on its optional LCD display as well as being transmitted with the data streams in GCF format. Full configuration and firmware updates can be carried out remotely over the standard serial interface.
Identical components to the 5T are also used in the 5TB borehole accelerometer. Strong motion borehole instruments can provide important information on the sub-surface soil movements which cause a high proportion of the damage sustained by structures during an earthquake.
A 5TB module can also be fitted as part of a combined weak- and strong-motion borehole instrument, providing unsurpassed resolution and dynamic range for both local events and teleseisms.

Data flow ideas

Guralp Systems hardware works as a modular system using standard protocols, giving engineers the flexibility to design the network to their needs. A single installation might use any of a wide range of technologies:

Stations using any of these options can be combined to form the full array. Where arrays are installed during dam construction, a local area network is often installed as part of the basic infrastructure. Alternatively, RS232, RS422, fibre-optic, Wi-Fi (802.11b) or radio links can be used. Wireless technology is particularly attractive where laying dedicated cabling would be impractical, or for temporary experiments.

Guralp Systems can supply all the hardware required to build a fully networked seismic array to your specifications.
Industry guide: Strong motion arrays for civil structures