by Anthony Shakal, Kuo-Wan Lin, Moh Huang, Christopher Stephens, Woody Savage, Egil Hauksson and Hugo Rico
Shakal, Anthony, Kuo-Wan Lin, Moh Huang, Christopher Stephens, Woody Savage, Egil Hauksson and Hugo Rico (2003). Utilizing Strong-Motion Data after Earthquakes: Update on the CISN Engineering Data Center, Internet Quick Report, ShakeMap and CISN Display. SMIP03
Seminar on Utilization of Strong-Motion Data, p. 35 - 46.
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The California Integrated Seismic Network (CISN) is a consortium of institutions
engaged in statewide earthquake monitoring. The five core members are the California
Geological Survey, the California Institute of Technology, the U.S. Geological Survey Offices at
Pasadena and Menlo Park, and UC Berkeley. The California Office of Emergenc y Services
(OES) participates as an ex-officio participant. The TriNet project initiated in southern
California with FEMA support was a prototype for the statewide CISN project.
The CISN has a statewide Engineering Data Center, a southern California seismic Data
Center at Pasadena, and a northern California seismic Data Center in the Bay area. The CISN
Engineering Data Center is operated by the CGS Strong Motion Instrumentation Program
(CSMIP) in cooperation with the USGS National Strong Motion Program (NSMP).
A primary goal of the Engineering Data Center as well as the other two Data Centers is to
provide robust and rapid information products after an earthquake, with products ranging from
the ShakeMap to strong- motion data and calculated parameters. A high-speed T-1 computer
communication network, or Intranet, which connects all CISN partner agencies has been recently
established, depicted in Figure 1. The T-1 communication ring consists of dedicated segments
connecting each center and OES, and is completely independent of the Internet. The ring
became operational early in 2003. The Internet is also used in communication between the
centers, but the T-1 ring provides the secure, reliable backup to the Internet that is needed. A
second level of backup, using OES satellite communication channels, is also planned.
Effective communication requires standardized protocols. Data packets and formats for
the exchange of parametric data and waveforms are being finalized by the CISN Program
Management Committee and its Standards Committee. With the completion of the T-1 ring, the
CISN partners have begun routine exchange of strong-motion parametric data between centers
while the protocols for exchange of waveforms are being standardized. When routine waveform
exchange begins, planned for later in 2003, it will be possible to assemble the strong-motion data
for all strong-motion stations in the State at CISN, in forms convenient for use by the earthquake
engineering or seismology communities, an unprecedented advance.