Strong seismic scatterers near the core-mantle boundary West of Mexico

Fenglin Niu; Lianxing Wen

doi:10.1029/2001GL013270

Strong seismic scatterers near the core-mantle boundary West of Mexico

Fenglin Niu
, Lianxing Wen

Geosciences

Stony Brook University

Carnegie Institution of Washington

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

PKP phases observed in Japan show strong precursors with clear onsets for earthquakes that occurred in south America. The onset times of the PKP precursors can all be explained by existence of seismic scatterers in the lowermost 100 km of the mantle west of Mexico, within an area of 200 km x 300 km. Forward modeling of PKP precursor amplitudes indicates that a P-wave velocity variation of at least 6% is required to explain the large amplitudes of the observed PKP precursors, suggesting that the core-mantle boundary region beneath west of Mexico is a highly anomalous region characterized by strong seismic scatterers.

Original language	English
Pages (from-to)	3557-3560
Number of pages	4
Journal	Geophysical Research Letters
Volume	28
Issue number	18
DOIs	https://doi.org/10.1029/2001GL013270
State	Published - Sep 15 2001

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title = "Strong seismic scatterers near the core-mantle boundary West of Mexico",

abstract = "PKP phases observed in Japan show strong precursors with clear onsets for earthquakes that occurred in south America. The onset times of the PKP precursors can all be explained by existence of seismic scatterers in the lowermost 100 km of the mantle west of Mexico, within an area of 200 km x 300 km. Forward modeling of PKP precursor amplitudes indicates that a P-wave velocity variation of at least 6\% is required to explain the large amplitudes of the observed PKP precursors, suggesting that the core-mantle boundary region beneath west of Mexico is a highly anomalous region characterized by strong seismic scatterers.",

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AU - Niu, Fenglin

AU - Wen, Lianxing

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N2 - PKP phases observed in Japan show strong precursors with clear onsets for earthquakes that occurred in south America. The onset times of the PKP precursors can all be explained by existence of seismic scatterers in the lowermost 100 km of the mantle west of Mexico, within an area of 200 km x 300 km. Forward modeling of PKP precursor amplitudes indicates that a P-wave velocity variation of at least 6% is required to explain the large amplitudes of the observed PKP precursors, suggesting that the core-mantle boundary region beneath west of Mexico is a highly anomalous region characterized by strong seismic scatterers.

AB - PKP phases observed in Japan show strong precursors with clear onsets for earthquakes that occurred in south America. The onset times of the PKP precursors can all be explained by existence of seismic scatterers in the lowermost 100 km of the mantle west of Mexico, within an area of 200 km x 300 km. Forward modeling of PKP precursor amplitudes indicates that a P-wave velocity variation of at least 6% is required to explain the large amplitudes of the observed PKP precursors, suggesting that the core-mantle boundary region beneath west of Mexico is a highly anomalous region characterized by strong seismic scatterers.

UR - https://www.scopus.com/pages/publications/0035883396

U2 - 10.1029/2001GL013270

DO - 10.1029/2001GL013270

M3 - Article

SN - 0094-8276

VL - 28

SP - 3557

EP - 3560

JO - Geophysical Research Letters

JF - Geophysical Research Letters

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ER -

Strong seismic scatterers near the core-mantle boundary West of Mexico

Abstract

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