PNSN Strong Motion Network PNSN > Strong Motion > Overview

3. Data Telemetry

• the sensor converts ground motion to an analog voltage signal
• the digitizer converts analog voltage to digital counts, time stamps the data from a GPS clock and groups the data into logical packets for export through a serial port
• the Internet-interface takes the data packets as input through a serial port and wraps each packet in TCP/IP for export over Ethernet.
• data packets are received at the PNSN and merged with data from other PNSN stations
• data are processed for earthquake location and magnitude, as well as parametric data such as peak acceleration and provided to others via several different methods.

Diagram of Data Flow at a Station

PNSN Data Acquisition

The data acquisition system of the PNSN is a local implementation of the Earthworm Data Acquisition System.

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Updated August 13, 2002