1998
DOI: 10.1029/97jb02565
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Detection of lower mantle scatterers northeast of the Marianna subduction zone using short‐period array data

Abstract: Abstract. Short period University of Washington, northern California, and southern California seismic array records of a sequence of deep Mariana subduction zone earthquakes show unexpected clear arrivals nearly 90 and 105 s following P. We measure slowness, arrival time, and arrival azimuth of these phases relative to P using array techniques to find where they emanate in the mantle. By combining slowness and back azimuth deviations and the move-out with depth of the arrivals from different earthquakes, we fi… Show more

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Cited by 98 publications
(81 citation statements)
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“…8.2 s deg -1 that would correspond to these core phases. Vertical records of Event 3 exhibited low amplitude very shortperiod energy which probably was the X phase (it was interpreted as such and used by Kaneshima & Helffrich 1998). The short-period nature of the phase made it unuseable with the array and stacking method we use.…”
Section: Discussionmentioning
confidence: 99%
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“…8.2 s deg -1 that would correspond to these core phases. Vertical records of Event 3 exhibited low amplitude very shortperiod energy which probably was the X phase (it was interpreted as such and used by Kaneshima & Helffrich 1998). The short-period nature of the phase made it unuseable with the array and stacking method we use.…”
Section: Discussionmentioning
confidence: 99%
“…Another process producing large amplitudes could be focusing by a perturbation of the 410 km distributed across a region larger than California. This would focus PP410p (SS410s) waves for stations in California (and Washington, Kaneshima & Helffrich 1998), so we would expect to see the high amplitude X (SX) phases for shallower earthquakes and earthquakes near the aftershock area of Event 1 (Fig. 5), which we do not see.…”
Section: Receiver Side Structure?mentioning
confidence: 98%
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“…Such waves could be generated through scattering or reflections off lateral inhomogeneities. It is also possible that high-and low-velocity regions can refract waves and introduce deviations in slowness and/or backazimuths [e.g., (Kaneshima and Helffrich 1998;Weber and Wicks 1996;Rost et al 2008;Kito et al 2008)]. For such waves it is necessary to determine slowness and backazimuth simultaneously.…”
Section: Simultaneous Slowness and Backazimuth Measurementmentioning
confidence: 98%