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

2. 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

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. 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: bits resolution
Sensor: ≥ 87dB dynamic range over Hz\
Ample event storage
Daily log files recoverable
Serviceable user

5. Procurement Status Proposals awarded to GeoSig 3 prototypes delivered
36 GSR-IA18 units to be
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