Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.216..693t&link_type=abstract
Earth and Planetary Science Letters, Volume 216, Issue 4, p. 693-702.
Mathematics
Logic
6
Core-Mantle Boundary, Ultra-Low Velocity Zone, Lower Mantle, Nuclear Explosions, Reflection Seismology, Long-Range Explosion Seismology
Scientific paper
Recent seismological studies have presented evidence for the existence of a layer with ultra-low seismic velocities at the core-mantle boundary at ca. 2900 km depth. We report high-amplitude, high-frequency, and laterally coherent seismic arrivals from three nuclear explosions in Siberia. With recording station intervals of 15 km, the seismic phases are readily correlated and show the presence of a thin, ultra-low velocity zone in a region where it was not previously reported. The duration and complexity of the arrivals are inconsistent with a simple core-mantle boundary and require a hitherto unidentified, kilometre-scale, fine structure in the ultra-low velocity zone. The observations may be explained by a ca. 7 km thick, two-layer, ultra-low velocity zone with exceptional low velocities, which indicate the presence of high percentages of melt (>15%), in particular in the lower part of the zone. Waveform variation implies lateral change in the thickness and physical properties of the ultra-low velocity zone with a wavelength of less than 100 km.
Egorkin Anatolij V.
Ross Andrew R.
Thybo Hans
No associations
LandOfFree
Explosion seismic reflections from the Earth's core does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Explosion seismic reflections from the Earth's core, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Explosion seismic reflections from the Earth's core will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-879018