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Part II: The new Malargüe seismic array

Elmer Ruigrok, Deyan Draganov and Kees Wapenaar. Part II: The new Malargüe seismic array. IS@AO Workshop, Cambridge, April 19 th 2011. MalaRRgu e: A large seismic array in the Malarg üe department Partial collocation with Pierre Auger Observatory 2012: temporary array of 80 stations

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Part II: The new Malargüe seismic array

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  1. Elmer Ruigrok, Deyan Draganov and Kees Wapenaar Part II: The new Malargüe seismic array IS@AO Workshop, Cambridge, April 19th 2011

  2. MalaRRgue: A large seismic array in the Malargüe department Partial collocation with Pierre Auger Observatory 2012: temporary array of 80 stations >=2013: ‘permanent’ array Monitoring and imaging the subsurface Application of recently developed techniques International team of geophysicists MalaRRgue ICES

  3. Outline • Why a seismic array in Malargüe? • How will we achieve high-resolution subsurface images?

  4. Why a seismic array in Malargüe? • How will we achieve high-resolution subsurface images?

  5. The missing seismic array … Swell Local waves Ocean waves Seismic arrays (Koper et al., 2010) Oceanic -> seismic waves Beamforming seismic waves -> sea state MalaRRgue, aim 1: monitoring the southern oceans

  6. Peteroa volcano Volcano activity, September 2010 MalaRRgue, aim 2: imaging and monitoring the Peteroa volcano

  7. Tectonic setting

  8. Volcanism features

  9. Imaging challenges still to be addressed (Gilbert et al., 2006) Malargüe • Known • Moho depth • Our imaging targets • Moho topography • Basin topography • Nazca slab depth • Magma intrusions • Major faults MalaRRgue, aim 3: detailed imaging of the lithosphere

  10. Local seismicity Regional seismicity Malargüe MalaRRgue, aim 4: localizing local seismic activity

  11. Preliminary array design

  12. Positioning with Pierre Auger stations PA particle detector Seismic station

  13. Why a seismic array in Malargüe? • How will we achieve high-resolution subsurface images?

  14. Illumination for passive seismology I A method using teleseismic arrivals

  15. Illumination for passive seismology II A method using teleseismic arrivals Crust and upper mantle

  16. Conventional method: receiver function Crust and upper mantle

  17. Receiver function image Malargüe

  18. New method: seismic interferometry, input ~3km Crust and upper mantle

  19. Example response selection P and reverberations PP and reverberations Time-window and separate pre-processing

  20. New method: seismic interferometry, output Subsurface reflectivity image (example) Further processing

  21. A dense sensor network Malargüe • T-array • 2 orthogonal linear subarrays • 3 km inline spacing • 42 stations • ‘Basin’ setting

  22. Illumination by earthquakes and storms I: Inline earthquakes II: Inline oceanic storms (Landes et al., 2010)

  23. High-resolution subsurface imaging • Reflection imaging instead of conversion imaging • Dense sensor network • Using not only earthquake responses, but also storm-induced waves

  24. Summary Large seismic array (80 stations) planned in the Malargüe department • Imaging subsurface • Monitoring the sea state in the SH • Monitoring volcanic activity • Monitoring local seismicity

  25. PAO synergies • Facility and expertise exchange • Coupling atmospheric gravity waves with seismic waves? • Coupling lightening to seismic waves?

  26. ?

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