Tomography reveals buoyant asthenosphere accumulating beneath the Juan de Fuca plate

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Science  23 Sep 2016:
Vol. 353, Issue 6306, pp. 1406-1408
DOI: 10.1126/science.aad8104

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  • RE: Seismic Velocities on Neptune

    The Canadian Neptune ONC mini-seismic array straddles the Cascadia trench and has 2 Geophones in each plate, north of your study area. Fibre Optic Cable interconnects the signals from these Cascadia Stations all beneath the Pacific Ocean. In looking at the velocity travel times that ONC have been receiving from these geophones, Near-Field quakes to the geophones (under 300 KMs) show a very wide spread of P arrival velocities as seen at the geophones. Significant, velocity /travel time differences of almost a factor of two exist for the same event as seen by different geophone locations. The results are not consistent but may map out a anisotropic stressed zone or low velocity zone along the coast. Do any of your results from your OBS work illustrate similar anomalies?

    Competing Interests: None declared.