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Netquakes Update

Update on the deployment status of strong motion stations to achieve the seismic monitoring goal. Details on new instrumentation, bottleneck challenges, and procurement progress for urban areas.

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Netquakes Update

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  1. Netquakes Update David Oppenheimer Presented to CISN Steering and Advisory Committees at Caltech, 27 September 2007

  2. Number of Strong Motion Stations Installed/Year San Fernando CISN & ANSS TriNet Number/Yr 3600 more stations needed to achieve Vision 2005 goal of 5500 stations It will take ~70 years at this rate

  3. NetQuakes RFP • USGS SEED funding to develop new SM instrumentation for urban areas • Designed to accelerate rate of new installations • Current bottlenecks • Purchase Cost • Permitting • Installation • Telemetry costs

  4. STA/LTA & Amplitude triggered 200 sps ±3g accelerometer (MEMS) Data queued until uploaded Periodic SOH messages issued Periodic queries to check for new software Periodic NTP synchronization Wireless (802.11g) 7 day waveform buffer Peak ground motions shipped first MiniSEED format Ability to remotely force a trigger Linux remotely upgradeable Firmware remotely upgradeable AC power with modest battery backup (4+ days in test) No GPS, but included NTP synchronization (±10 msec accuracy) Digitizer: 18-19 bits resolution Sensor: ≥ 87dB dynamic range over 0.1-35Hz\ Ample event storage Daily log files recoverable Serviceable user Specifications

  5. Procurement Status • Proposals awarded to GeoSig • 36 GSR-IA18 units to be delivered @$2760ea • 3 prototypes delivered • Hardware tested at ASL – generally meets • Software does not yet meet requirements • Delivery of remaining 33 expected 3/2008 • In field testing throughout CA summer 2008

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