Correlated shear and bulk moduli to 1400 km beneath the Mediterranean region

C. Schmid; S. van der Lee; D. Giardini

doi:10.1016/j.pepi.2006.07.003

Correlated shear and bulk moduli to 1400 km beneath the Mediterranean region

C. Schmid, S. van der Lee^*, D. Giardini

^*Corresponding author for this work

Earth and Planetary Sciences

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

20 Scopus citations

Abstract

We present a new model for the shear and compressional wave velocity structure of the Mediterranean plate boundary region. The model is obtained by a combined inversion of S and P data, where we solve in one single step for shear wave and bulk sound velocity variations. The ratios between the types of seismic velocities inferred from the combined inversion constrain the origin of heterogeneity. Our model is dominated by fast anomalies from subducted oceanic lithosphere. We found that only a slight amount of bulk sound velocity heterogeneity is required to explain the combined set of P and S data. Thus, compressional wave velocity anomalies are dominated by shear modulus heterogeneity and the ratio between bulk sound and shear wave velocity heterogeneity suggests a predominantly thermal origin.

Original language	English (US)
Pages (from-to)	213-224
Number of pages	12
Journal	Physics of the Earth and Planetary Interiors
Volume	159
Issue number	3-4
DOIs	https://doi.org/10.1016/j.pepi.2006.07.003
State	Published - Dec 2006

Keywords

Joint inversion
Mantle
Mediterranean region
Seismic tomography

ASJC Scopus subject areas

Astronomy and Astrophysics
Geophysics
Physics and Astronomy (miscellaneous)
Space and Planetary Science

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10.1016/j.pepi.2006.07.003

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title = "Correlated shear and bulk moduli to 1400 km beneath the Mediterranean region",

abstract = "We present a new model for the shear and compressional wave velocity structure of the Mediterranean plate boundary region. The model is obtained by a combined inversion of S and P data, where we solve in one single step for shear wave and bulk sound velocity variations. The ratios between the types of seismic velocities inferred from the combined inversion constrain the origin of heterogeneity. Our model is dominated by fast anomalies from subducted oceanic lithosphere. We found that only a slight amount of bulk sound velocity heterogeneity is required to explain the combined set of P and S data. Thus, compressional wave velocity anomalies are dominated by shear modulus heterogeneity and the ratio between bulk sound and shear wave velocity heterogeneity suggests a predominantly thermal origin.",

keywords = "Joint inversion, Mantle, Mediterranean region, Seismic tomography",

author = "C. Schmid and {van der Lee}, S. and D. Giardini",

note = "Funding Information: We are grateful for constructive reviews from two anonymous reviewers. We thank John VanDecar for numerous insightful discussions as well as constructive review comments. CS and the MIDSEA data acquisition effort were supported by the Swiss Nationalfonds. SvdL gratefully acknowledges support from US DOE contract DE-FC52-04NA25541. We also thank the Carnegie Institution of Washington for supporting the initial development of the new, joint inversion method applied here. This work would not have been accomplished without the data acquisition efforts of the MIDSEA participants (see Van der Lee et al. (2001) for a full list). This is contribution number 1459 of the Institute of Geophysics, ETH Z{\"u}rich.",

year = "2006",

month = dec,

doi = "10.1016/j.pepi.2006.07.003",

language = "English (US)",

volume = "159",

pages = "213--224",

journal = "Physics of the Earth and Planetary Interiors",

issn = "0031-9201",

publisher = "Elsevier B.V.",

number = "3-4",

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TY - JOUR

T1 - Correlated shear and bulk moduli to 1400 km beneath the Mediterranean region

AU - Schmid, C.

AU - van der Lee, S.

AU - Giardini, D.

N1 - Funding Information: We are grateful for constructive reviews from two anonymous reviewers. We thank John VanDecar for numerous insightful discussions as well as constructive review comments. CS and the MIDSEA data acquisition effort were supported by the Swiss Nationalfonds. SvdL gratefully acknowledges support from US DOE contract DE-FC52-04NA25541. We also thank the Carnegie Institution of Washington for supporting the initial development of the new, joint inversion method applied here. This work would not have been accomplished without the data acquisition efforts of the MIDSEA participants (see Van der Lee et al. (2001) for a full list). This is contribution number 1459 of the Institute of Geophysics, ETH Zürich.

PY - 2006/12

Y1 - 2006/12

N2 - We present a new model for the shear and compressional wave velocity structure of the Mediterranean plate boundary region. The model is obtained by a combined inversion of S and P data, where we solve in one single step for shear wave and bulk sound velocity variations. The ratios between the types of seismic velocities inferred from the combined inversion constrain the origin of heterogeneity. Our model is dominated by fast anomalies from subducted oceanic lithosphere. We found that only a slight amount of bulk sound velocity heterogeneity is required to explain the combined set of P and S data. Thus, compressional wave velocity anomalies are dominated by shear modulus heterogeneity and the ratio between bulk sound and shear wave velocity heterogeneity suggests a predominantly thermal origin.

AB - We present a new model for the shear and compressional wave velocity structure of the Mediterranean plate boundary region. The model is obtained by a combined inversion of S and P data, where we solve in one single step for shear wave and bulk sound velocity variations. The ratios between the types of seismic velocities inferred from the combined inversion constrain the origin of heterogeneity. Our model is dominated by fast anomalies from subducted oceanic lithosphere. We found that only a slight amount of bulk sound velocity heterogeneity is required to explain the combined set of P and S data. Thus, compressional wave velocity anomalies are dominated by shear modulus heterogeneity and the ratio between bulk sound and shear wave velocity heterogeneity suggests a predominantly thermal origin.

KW - Joint inversion

KW - Mantle

KW - Mediterranean region

KW - Seismic tomography

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DO - 10.1016/j.pepi.2006.07.003

M3 - Article

AN - SCOPUS:33750517759

SN - 0031-9201

VL - 159

SP - 213

EP - 224

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

IS - 3-4

ER -

Correlated shear and bulk moduli to 1400 km beneath the Mediterranean region

Abstract

Keywords

ASJC Scopus subject areas

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