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Relative Teleseismic Surface Wave Attenuation using Transportable Array Data

Relative Teleseismic Surface Wave Attenuation using Transportable Array Data. Team QDP ON Austin Holland, Joshua Richardson, Weisen Shen, Paul Ogwari. Motivation. Educational movies exist to observe wave phases and particle motions across US array stations

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Relative Teleseismic Surface Wave Attenuation using Transportable Array Data

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  1. Relative Teleseismic Surface Wave Attenuation using Transportable Array Data Team QDP ON Austin Holland, Joshua Richardson, Weisen Shen, Paul Ogwari

  2. Motivation • Educational movies exist to observe wave phases and particle motions across US array stations • Relative attenuation movies for surface wave propagation across the US array may provide an educational outreach opportunity for understanding of decay throughout various geologic regimes at a variety of scales • Simple attenuation calculations of corrected amplitude reduction between stations can easily be calculated • Relative attenuation calculations yield an additional benefit of identifying faulty sensors, site effects and receiver effects

  3. Final Product • Each station shaded in response to relative attenuation between adjacent stations for plane-wave approximated teleseismic travel paths • Extensive suite of maps produced at a full range of group velocities for Rayleigh and Love phases • Attenuation movies will be colored as surface waves reach stations, but will remain colored to produce a static suite of maps

  4. Prototype Design • Display Rayleigh wave attenuation movie from M7.5 Chile earthquake in 2010 • Include only one filtered group velocity for energy propigating northward along the long axis of the transportable array • Window energy empirically and base attenuation calculations off of the maximum absolute value amplitude between stations corrected for cylindrical spreading

  5. Lessons Learned for Rapid Prototyping • We started with working code that did not do exactly what we wanted • Take the part that does exactly what you want • Get rid of the rest so as to keep the code clean and understandable • Collaborative code capability would have dramatically improved our time to a working prototype

  6. Other Examples

  7. Example Using Ambient Noise

  8. Proposed Improvements • Calculate waveform envelopes for surface wave groups • Provide averaged map products for long-term teleseism surface wave attenuation for a full suite of azimuths • Provide exportable, geo-referenced products that can be compared to tomography studies, receiver function studies, ambient noise tomography studies, etc.

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