U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior U.S. Geological Survey Real-time GPS integration for prototype earthquake early warning and near-field imaging of the earthquake rupture process Hudnut, K.W., A. Aspiotes, D. Determan, D. Given, J.S. Gomberg, N.E. King, J.O. Langbein, M. Lisowski, J.R. Murray-Moraleda and Sarah Minson United States Geological Survey; Earthquake & Volcano Program Offices Geodesy Workshop U. S. Geological Survey Pasadena, CA 14 June 2012

USGS real-time GPS status Operational at USGS (global): – ShakeMap (work in progress to incl. GPS for finite-fault source modeling) – PAGER (includes loss estimation; ditto above r.e. GPS inclusion) – Magnitude & CMT estimation and finite-fault source modeling Work in progress on EEW to integrate GPS in real-time, along with other partners (Caltech, UC Berkeley, UW, CWU, SIO, JPL, SCEC) funded by Moore Foundation: – EEW prototype development; in beta testing now with City of LA and Cal EMA Work in progress on real-time GPS at USGS Pasadena, CVO, Menlo Park: – Testing of RTG with JPL (pure PPP) [stalled, but Blewitt doing PPP work] – Testing of RTNet with GPS Solutions, Inc. (RTK so far, mixed w/ PPP soon) – Testing of TrackRT with MIT (pure RTK) Challenge – integrate real-time GPS into EEW systems and build scalable, affordable and flexible system that can be adapted into existing systems at the USGS earthquake monitoring facilities and volcano observatories, as well as at NOAA and other tsunami warning centers

USGS real-time GPS status Operational at USGS Pasadena 75 stations now are telemetered in real-time (out 104 stations) Replaced dial-up POTS lines with cell modems and enabled real-time streaming Upgrades to TOPCONs progressing; over 50 in place now Fewer than about 25 Z-12’s ~24 NetRS streaming and ~50 TOPCONs streaming 24 new GPS stations co-located with seismic stations, called SoSAFz (‘zipper array’) – next slide shows locations. These are the ones many investigators have successfully used to study the El Mayor – Cucapah earthquake w/ GPS & strong-motion Several station landowners are requiring funds to renew operating permits (BCWR – PG&E wants $1000 for 10 yr. permit; WNRA - USACE wants $4500 for 5 yr. permit; Los Padres National Forest – USFS – 3 sites, cost TBD)

Southern San Andreas Fault ‘Zipper’ Buildout ELTN & ELTS pair w/ LADWP Next will be SJF Portal Quad w/ MWD, then Anza Pair

Software status TrackRT and RTNet testing is progressing well – TrackRT processing 40 stations – RTNet in use for all 75 real-time stations (licensed for running on two machines; RAM upgrades completed for these two 12 CPU machines) – Ustream updates now auto-update RTES for station config TrackRT and RTNet output is being converted to Mini-SEED, in exact format requested by USGS seismologists for use in SCSN/EEW prototype Mini-SEED is being written to local disk and format has been studied and approved by SCSN/EEW programmer for imminent incorporation. Decided last week on work flow - earthworm will be configured to run on our side to output a properly formatted and filtered set of data streams for each station. [ready to make connection]