Georgia State UniversitySensorweb Research Laboratory

VolcanoSRI: 4D Volcano Seismic Tomography in a Large-scale Sensor Network

WenZhan Song, Ph.D.Associate ProfessorDirector of Sensorweb Research LabDepartment of Computer ScienceGeorgia State University

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VolcanoSRI: Volcano Seismic Realtime

Imaging

VolcanoSRI: Volcano Seismic Realtime Imaging * make the fictional holographic projector “Virgil” in Supervolcano film a reality: http://www.youtube.com/watch?v=WF-RKzqNtz0 (3:49)

NSF CDI($1.83M 2011-2015): VolcanoSRI: 4D Volcano Tomography in a Large-scale Sensor Networks (PI: Song (GSU), Co-PI: Lees (UNC), Xing (MSU)).http://sensorweb.cs.gsu.edu/research/VolcanoSRI.html

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VolcanoSRI: Vigil in Supervolcano Film

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VolcanoSRI: Volcano Seismic Realtime Imaging

The tentative deployment map at Ecuador

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Instrumentation

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Tomographic Inversion n – number of nodes in the network m – dimension of tomography; thus

the size of tomography model is m3

Anxm3

sm3x1

tnx1=

node i

Each node i only has Ai and ti, e.g., the i-th row info in A and t. All nodes together to find s such that ||As-t|| is minimized. s is the 3D velocity model and can be very big (e.g., 500x500x500, if m=500). Here, A is just illustrated as the matrix for one EQ event only. There will be many EQ events and EQ event is processed one after another.

In VolcanoSRI, n =500, m = 500,although each row Ai is very sparse.

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Multi-resolution Evolving Tomography

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Vertical Tomograph Partition

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Accuracy

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Robustness

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Communication Cost

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Oilfield Explorations

http://www.forbes.com/2004/10/04/cx_af_1004oilimaging.html

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Thank you!Thank you!Questions or Comments?

Dr. WenZhan Songwsong@gsu.edu(404)413-5734

More information: http://sensorweb.cs.gsu.edu

Sensor Web: Connecting Dots for Intelligence

Sensorweb Service Portal

Thanks for listening!

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NASA project ($1.6M 2007-2009): Optimized Autonomous Space In-situ Sensorweb. Collaborative project between WSU, USGS and JPL (PI: Song, Co-I: Shirazi, LaHusen, Kedar, Chien, Webb). NASA Video: http://sensorweb.cs.gsu.edu/news.html

Project website: http://sensorweb.cs.gsu.edu/research/oasis.html

Space In-situ Sensor Web

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GPS antenna

omnidirectional antenna

seismic sensor

ash detector

- iMote2 and accessories- infrasonic sensors- air-alkaline batteries

air-drop hook