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Broadband Array Processing of SH-wave Data using superarrays Michael S. Thorne.

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Presentation on theme: "Broadband Array Processing of SH-wave Data using superarrays Michael S. Thorne."— Presentation transcript:

1 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Broadband Array Processing of SH-wave Data using superarrays Michael S. Thorne University of Utah Nicholas C. Schmerr NASA Goddard

2 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne High Lava Plains (HLP) Flexible Array Final Array: 118 broadband stations Deployment: ~ 2006-2009 Station spacing: ~ 20 km Aperature: ~400 km NW-SE line. http://www.dtm.ciw.edu/research/HLP/

3 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Scd Array Processing - Data

4 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Scd Array Processing - Data Transverse component displacement seismograms. Up to 94 traces used in a single event. Other stations also used if within HLP circumference. Aligned and normalized to unity on direct-S. BP filtered 1-20 s.

5 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne 200806292053 Scd Array Processing - Vespagrams

6 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Scd Array Processing - Vespagrams

7 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Scd Array Processing - Data Event: 200707161417 Depth: 350 km Mw: 6.8 Avg Distance: 75.6 deg

8 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Scd Array Processing - Data Event: 200707161417 Depth: 350 km Mw: 6.8 Avg Distance: 75.6 deg

9 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne 200908091055

10 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne D” discontinuity topography Hutko et al.

11 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Scd Array Processing - Observations 11 good events Roughly 2 years data Central America D” thickness: 279-290 km dVs = 1.5-3.0% Bering Sea D” thickness: 248-260 km dVs = 1.5-2.0% Radial Components: No Scd visible. Some observations at shorter distances than Scd normally observed.

12 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne SS Precursors

13 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne 300-km Discontinuity (Schmerr, Kelly, Thorne – GRL, 2013)

14 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne 300-km Discontinuity (Schmerr, Kelly, Thorne – GRL, 2013)

15 michael.thorne@utah.edumichael.thorne@utah.edu http://web.utah.edu/thorne Summary Standard array processing techniques to SH-wave data; laterally variable low amplitude discontinuities can be mapped; but only limited spatial extent with single arrays. Flexible array type experiments seems sufficient in layout/design. Cross design not perfect. Good slowness resolution in most directions, but circular geometry preferred. 2-3 year PASSCAL type deployment – too short of a time span. 5+ years would be preferred. Given 500 stations, I’d opt for multiple 100-sensor arrays.

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