Netquakes Update

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

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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

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Procurement Status

• Proposals awarded to GeoSig
• 36 GSR-IA18 units to be delivered _at_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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