CISN Steering and Advisory Committees Netquakes Update David Oppenheimer Presented to CISN Steering and Advisory Committees at Caltech, 27 September 2007
Number of Strong Motion Stations Installed/Year Fernando San TriNet CISN & ANSS Number/Yr 3600 more stations needed to achieve Vision 2005 goal of 5500 stations It will take ~70 years at this rate
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
Specifications 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
Procurement Status Proposals awarded to GeoSig 3 prototypes delivered 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