David Oppenheimer John Evans Bob Hutt Gray Jensen Jim Luetgert

The Parkfield Experience 50 SM stations within 20km 80% were SMA-1 recorders Wave field aliased

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

Project History 4-6/2006: Developed “Specifications for an Accelerograph Appliance” 8/8/2006: RFP announced –Develop/deliver 3 prototypes –Purchase as many additional units within $100K 9/26/2006: Award issued to GeoSig September 2006 –36 accelerographs 7/6/2007: Prototypes delivered 9/7/2007: Round 1 of testing at ASL and Menlo Park 3/5/2008: Round 2 of testing at ASL and Menlo Park 4/22/2008: Prototypes meet specifications

The NetQuakes Concept Volunteer hosts with wireless Internet solicited Technician installs device –Bolt cradle, orient device, configure device, determine GPS coordinates USGS monitors SOH messages Hosts swap out bad units/batteries – not technicians Research quality data without site visits, telemetry bills, permit hassles

Specifications Serviceable by hosts –Swap unit –Swap battery Functionality –Uploads earthquake triggers immediately in mSEED –1 week of ring –Linux Accepts algorithms –Contacts server periodically Uploads SOH in XML Downloads –new config files –forced triggers –Unix scripts –OS revisions –Firmware revisions Communications –Wireless (802.11b) with at least WEP security –Ethernet –Initiates connection to server –Attempts to connect to alternate servers –Secure data transmission Power –110 VAC –<5W –Revert to internal battery on loss of AC power with at least 1 hour runtime –Auto shutdown on low battery –Auto boot when power is available

Specifications 3 orthogonal accelerometers –3g minimum clipping –Sensor linearity >90dB –Flat Hz –Clipping recovery within 10s Digitizer –>16bits minimum –200 sps (selectable preferred) –Timing accurate to 20ms with NTP, GPS capable –Clock drift <10ms/day –Synchronous sampling –System noise less than sensor noise Triggering (i.e., no continuous transmission) –STA/LTA –Level –Duration configurable –Indefinite event data storage until uploaded –Overwriting of smaller events if storage full –Event summary file for ShakeMap

Bolt hole Orientation Pin Hole for Threaded rod 3-pt leveling screws below

Flash Memory Colibrys SF2005S ±3-g MEMS accelerometers >36-hour Sealed Lead Acid Battery Three 1000sps Burr-Brown (TI) ADCs

Threaded rods GPSPower Ethernet Wireless Console Ethernet

Padlock hole Securing screws

Clipping Tests

Tilt tests

Seconds M /01/22 20:46:58 recorded at CI.GSA (40km) CI NQ HNZ 0.34 cm/s/s HNE 0.42 cm/s/s HNN 0.41 cm/s/s

M4.3

Software Status: SeisNetWatch Server Functional

Software Status: Registration Page Functional

Project Status 3 Servers operating in Menlo Park, Golden, and Caltech –Peak ground motions fed into CISN system –Waveform images created dynamically and available on USGS web –SOH fed into SNW 61 units delivered; 59 on order 2 units sent to 6 regional seismic networks (HV, UW, CI, UU, NM, LD) ~40 to be deployed in SF Bay region 33 volunteers in first, private solicitation 5-year/$3M contract in place

Is NetQuakes Suitable for RAMP? Advantages o Easy to install; could be used in buildings o 3-g full-scale o Relatively inexpensive o RT or delayed integration via Internet o Involves citizens (and provides security) Disadvantages o Acceleration only o Events only, but can be remotely triggered if connected