Güralp Compressed Format (GCF) Specifications

Güralp Systems sensors and data modules use Güralp Compressed Format (GCF) to share seismic data. The format can be used for data storage or transmission over a serial link (using BRP — block recovery protocol), or a TCP/UDP network (using the Scream protocol).

Below are links to specification documents.

• Quick reference — a simple page giving an overview of GCF data and BRP/Scream transmission.
• GCF reference — the full specification of the GCF packet format. Strong motion (SM) and unified status (01) packets are defined in:
  • Unified status packets
  • Strong Motion Calculations
• Block Recovery Protocol — the full specification of the BRP protocol for serial data transmission.
• Scream Protocol — the full specification of the Scream protocol for IP network data transmission.