Small Aperture Seismic Array at Dobra Voda

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					  Small Aperture Seismic
   Array at Dobra Voda



 Jaroslav Strunc, Milan Broz, Jiri Malek
Institute of Rock Structure and Mechanics ASCR
      Outline
      • IRSM – Progseis Cooperation
      • Dobra Voda
      • Array
             − geometry
             − equipment
      • Quarry Blasts
             − accurate time measurement
September 30, 2010          AIM Annual Meeting 2010   2
      IRSM – Progseis Cooperation (1)
      • Long Time Collaboration
             − seismic stations equipment
             − data management
             − remote checking utilities
             − software
      • Scientific Project Proposals
             − Little Carpathian

September 30, 2010            AIM Annual Meeting 2010   3
      IRSM – Progseis Cooperation (2)
      • RUP2004/RUP2009 Datalogger
             − 3/4 channel
             − 21 bit (from this year 28 bit) A/D module
             − custom modifications
      • 12-channel Model Variant – for Array
             − three 3-channel detached modules for
               satellite sensors & one for central sensor
             − developed in the framework of AIM
September 30, 2010             AIM Annual Meeting 2010      4
      RUP Datalogging System
      • Industrial PC
      • Windows based sw.
      • A/D Module
             −       28-bit,   4 channels
             −       28-bit,   12 channels
             −       21-bit,   4 channels
             −       14-bit,   8 channels
             −       14-bit,   16 channels


September 30, 2010                       AIM Annual Meeting 2010   5
      RUP Datalogging System




September 30, 2010   AIM Annual Meeting 2010   6
      RUP2009/28b/12ch
      • 1 Main & 3 Detached A/D Modules
      • Triangular Shape with the Central Sensor
      • Placed as Close to the Sensor as Possible
             − increase SNR
      • Up to 100m Far from Centre
      • ENOB 24; Resolution 28b; Arithmetic 32b
      • Common GPS Time Sync
September 30, 2010            AIM Annual Meeting 2010   7
      Dobra Voda (1)




                                               maps.google.com
September 30, 2010   AIM Annual Meeting 2010                     8
      Dobra Voda (2)




                                               maps.google.com
September 30, 2010   AIM Annual Meeting 2010                     9
      Dobra Voda (3)




September 30, 2010   AIM Annual Meeting 2010   10
      Dobra Voda
      • Aperture 90m - WEBNET
      • 1 Broadband Guralp (10s)
             − 320 V/(m/s)
             − res. 0.06 (nm/s)/LSB

      • 3 Shortperiodic LE3D (1s)
             − 400 V/(m/s)
             − res. 0.05 (nm/s)/LSB

      • Seismic Noise up to 40 nm/s
September 30, 2010              AIM Annual Meeting 2010   11
      Dobra Voda (5) Why Array?
      • Very Small Events Detection Ability
             − from Little Carpathian
      • Data Processing
             − DPEP by NORSAR
      • Deployment
             − the end of 2010 or beginning of 2011
             − currently just lined

September 30, 2010            AIM Annual Meeting 2010   12
      Quarry Blasts
      • Sufficient & Reliable Source
      • Measuring the Origin Time
      • Rays from Source to Stations
      • m. by RUP2009/14b or BR3 + Geophones
      • Several Examples Measured
      •  Velocity Model of Little Carpathian

September 30, 2010     AIM Annual Meeting 2010   13
      Quarries




                                               Progseis
September 30, 2010   AIM Annual Meeting 2010              14
      Quarries




September 30, 2010   AIM Annual Meeting 2010   15
      Quarry Blast – Example




September 30, 2010   AIM Annual Meeting 2010   16
      Conclusion
      • New A/D Module was Developed
             − software modifications of RUP system
      • Array at Dobra Voda is Lined
      • Quarries
             − contacted
             − examples measured
      • Now the Collecting Data Phase Begins 
September 30, 2010           AIM Annual Meeting 2010   17

				
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