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

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Presentation transcript:

Broadband Array Processing of SH-wave Data using superarrays Michael S. Thorne University of Utah Nicholas C. Schmerr NASA Goddard

High Lava Plains (HLP) Flexible Array Final Array: 118 broadband stations Deployment: ~ Station spacing: ~ 20 km Aperature: ~400 km NW-SE line.

Scd Array Processing - Data

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.

Scd Array Processing - Vespagrams

Scd Array Processing - Vespagrams

Scd Array Processing - Data Event: Depth: 350 km Mw: 6.8 Avg Distance: 75.6 deg

Scd Array Processing - Data Event: Depth: 350 km Mw: 6.8 Avg Distance: 75.6 deg

D” discontinuity topography Hutko et al.

Scd Array Processing - Observations 11 good events Roughly 2 years data Central America D” thickness: km dVs = % Bering Sea D” thickness: km dVs = % Radial Components: No Scd visible. Some observations at shorter distances than Scd normally observed.

SS Precursors

km Discontinuity (Schmerr, Kelly, Thorne – GRL, 2013)

km Discontinuity (Schmerr, Kelly, Thorne – GRL, 2013)

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.