Curt A. L. Szuberla, Daniel L. Osborne, Jay Helmericks and Debi-Lee Wilkinson Infrasound Group, University of Alaska Fairbanks Presented at the Infrasound Technology Workshop De Bilt, The NetherlandsOctober 2002 This presentation does not necessarily reflect the policies or views of the United States Government. The Infrasound Data Extraction and Archiving System (IDEAS) Used at Windless Bight, Antarctica (I55US) and Fairbanks, Alaska (I53US)

October 2002Infrasound Technology Workshop2 IDEAS Motivation Network infrastructure change at NSF/McMurdo (I55US) Data retrieval: sudden drop 98%  89% Mid-hour system resets: loss of remainder data Non-standard ASCII format Local control of processes

October 2002Infrasound Technology Workshop3 IDEAS Design Goals 100% data retrieval –2-week FIFO buffer –Partial hour processing Comprehensive visual & alarms At-a-glance operator oversight in near-real-time Redundant archiving Multi-station flexibility

October 2002Infrasound Technology Workshop4 IDEAS Software Topology IDEAS Master Retrieve Process Alarm Archive Paranoia ftp Stop Launch subordinate scripts via crontab each minute Gather raw CSS 3.0 data files & check filesizes Convert raw CSS 3.0 data  MATLAB data Analyze MATLAB data for warning conditions Export redundant copies of MATLAB data Data surety checks (local & external) Resolve anomalous ftp issues

October 2002Infrasound Technology Workshop5 IDEAS Data Server/Analyst Field Site CSS 3.0 Field Site CSS 3.0 Field Site CSS 3.0 Field Site CSS 3.0 Field Site CSS 3.0 Field Site CSS 3.0 IDEAS Processor IDEAS Processor IDEAS Processor IDEAS Processor IDEAS Processor IDEAS Processor ~20-days ~14-days ~365-days ssh/scp r/o ftp sshssh/scp local/central firewall(s) r/o ftp … … … scp

October 2002Infrasound Technology Workshop6 stout NSF UAF/GI ICPD I55US Windless Bight Antarctica ICPD I55US Windless Bight Antarctica chopin vivaldi ICPB I53US Fairbanks Alaska ICPB I53US Fairbanks Alaska

October 2002Infrasound Technology Workshop7

October 2002Infrasound Technology Workshop8 IDEAS State-of-Health Alarms MATLAB GUI Operator re-set support Searchable database Automatic acquisition & updates

October 2002Infrasound Technology Workshop9 IDEAS Status Scanner MATLAB plots Complete data set at-a-glance Searchable database Automatic acquisition & updates

October 2002Infrasound Technology Workshop10 Summary 100% of I55US CSS 3.0 data has been processed & archived 100% retrieval during CTBTO 24-hour network outage test at I55US Seamless integration of I53US beginning 26 August 2002 Future expansion & security enhancement