The lowermost mantle beneath Bering Sea – Geodynamic and mineral physical implications from seismic data

Content Provider	Semantic Scholar
Author	Hempel, S.
Copyright Year	2011
Abstract	Seismic array data are used to study a region of approximately 90x35 degrees beneath the Bering Sea and Alaska. We use P and S wave reflections off the core-mantle-boundary (CMB) and D” reflector with source-receiver combinations spanning a distance range from 60 to 85 degrees. More than 100 earthquakes originating in the Japan, Kuril-Kamchatka or Izu-Bonin-Mariana trench are used. These events of magnitudes from 5.7 to 7.3 were recorded by several seismic networks and arrays in Canada and the United States, often at temporary stations of the Earthscope project (US-Array). Array methods such as vespagrams or slowness-backazimuth analysis are used to determine travel time differences, slowness and backazimuth of P, PdP and PcP. Comparing amplitudes, waveforms and polarities of processed data with synthetic seismograms, we aim to determine the thickness of the reflector and the impedance contrast between lower mantle and D” layer.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.dynamicearth.de/Workshop.2011/Poster/hempel.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article