Seismic evidence for an inner core transition zone

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1998
Editor: 
Journal Title: 
Science
Journal Date: 
Oct 30
Place Published: 
Tertiary Title: 
Volume: 
282
Issue: 
5390
Pages: 
924-927
Section / Start page: 
Publisher: 
ISBN Number: 
0036-8075
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000076727300043
LDEO Publication Number: 
Call Number: 
Abstract: 

Seismic waves that traverse Earth's inner core along north-south paths produce unusually broad pulse shapes at long periods (compared with waves along east-west paths) and reflections from below;the inner core boundary at short periods. The observations provide compelling evidence for a seismic velocity discontinuity along north-south paths about 200 kilometers below the inner core boundary separating an isotropic upper inner core from an anisotropic Lower inner core. The triplication associated with such a structure might be responsible for reported waveform complexity of short-period inner core arrivals along north-south paths and, if the depth of the boundary is laterally variable, their Large travel-time variation.

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134DHTimes Cited:56Cited References Count:34

DOI: