Surface-wave arrival angles and wave-propagation effects at the USArray Transportable Array
Long-period surface waves with periods between 40 and 200 seconds allow for the
investigation of structure in Earth's lithosphere and upper asthenosphere. In a homogenous
3-D Earth, a surface wave will be observed to arrive at a station along the great circle path.
However, in heterogeneous structure, arrival angles deviate from this path. The USArray
Transportable Array (TA), part of the EarthScope program, provides a large array with close
station spacing to study arrival angle deviations and the propagation of the incoming wave …
investigation of structure in Earth's lithosphere and upper asthenosphere. In a homogenous
3-D Earth, a surface wave will be observed to arrive at a station along the great circle path.
However, in heterogeneous structure, arrival angles deviate from this path. The USArray
Transportable Array (TA), part of the EarthScope program, provides a large array with close
station spacing to study arrival angle deviations and the propagation of the incoming wave …
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