Constraining the hydration of the subducting Nazca plate beneath Northern Chile using subduction zone guided waves

Garth, T
Rietbrock, A

Publication date

July 2017

DOI

10.1016/j.epsl.2017.06.041

Publisher

Elsevier BV

Journal

Earth and Planetary Science Letters

Abstract

Guided wave dispersion is observed from earthquakes at 180–280 km depth recorded at stations in the fore-arc of Northern Chile, where the 44 Ma Nazca plate subducts beneath South America. Characteristic P-wave dispersion is observed at several stations in the Chilean fore-arc with high frequency energy (>5 Hz) arriving up to 3 s after low frequency (<2 Hz) arrivals. This dispersion has been attributed to low velocity structure within the subducting Nazca plate which acts as a waveguide, retaining and delaying high frequency energy. Full waveform modelling shows that the single LVL proposed by previous studies does not produce the first motion dispersion observed at multiple stations, or the extended P-wave coda observed in arrivals from int...

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Constraining the hydration of the subducting Nazca plate beneath Northern Chile using subduction zone guided waves

Abstract

Extracted data

Constraining the hydration of the subducting Nazca plate beneath Northern Chile using subduction zone guided waves

Abstract

Extracted data

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