New Candidate Ultralow-Velocity Zone Locations from Highly Anomalous SPdKS Waveforms
نویسندگان
چکیده
منابع مشابه
Inferences on ultralow-velocity zone structure from a global analysis of SPdKS waves
[1] Anomalous boundary layer structure at the core-mantle boundary (CMB) is investigated using a global set of broadband SKS and SPdKS waves from permanent and portable broadband seismometer arrays. SPdKS is an SKS wave that intersects the CMB at the critical angle for ScP, thus initiating a diffracted P wave (Pdiff) along the CMB at the core entry and exit locations. The waveshape and timing o...
متن کاملSPdKS analysis of ultralow-velocity zones beneath the western Pacific
[1] We collected a new data set of 1354 broadband SPdKS waveforms sampling the western Pacific Ocean region. These data indicate that multiple ultralow-velocity zones (ULVZs) exist in this region. We compared these data to 2.5-D synthetic seismograms computed with the PSVaxi method for a suite of 517 ULVZ models. The region beneath the North and South Philippine Sea shows no evidence for ULVZ p...
متن کاملFine-scale ultralow-velocity zone structure from high-frequency seismic array data
[1] Variability of core-mantle boundary (CMB) structure is imaged at the kilometer to tens of kilometers scale by intensive waveform modeling of the ScP phase. Recordings of earthquakes in the Tonga-Fiji subduction zone from the small-aperture (10 km), high-frequency ( 2–4 Hz) Alice Springs Array in central Australia are used to document anomalous ScP waveform variations due to the presence of ...
متن کاملOn the absence of an ultralow‐velocity zone in the North Pacific
[1] Using an unusually large earthquake near the big island of Hawaii, we study the core mantle boundary (CMB) beneath the north‐northeastern Pacific between Hawaii and North America. A dense sampling of the CMB is achieved using the core‐reflected phase PcP recorded at a large number of high‐quality stations in North America, including networks in California, Oregon, Washington, and Alaska, as...
متن کاملRelationship between the viscosity and topography of the ultralow-velocity zone near the core–mantle boundary
Article history: Received 31 December 2009 Received in revised form 14 September 2010 Accepted 17 September 2010 Available online 14 October 2010
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ژورنال
عنوان ژورنال: Minerals
سال: 2020
ISSN: 2075-163X
DOI: 10.3390/min10030211