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Factors influencing seismic wave attenuation in the lithosphere in continental rift zones

Authors: А. А. Dobrynina; V. A. Sankov; J. Déverchère; V. V. Chechelnitsky;

Factors influencing seismic wave attenuation in the lithosphere in continental rift zones

Abstract

Attenuation of seismic waves in the crust and the upper mantle has been studied in three global rift systems: the Baikal rift system (Eurasia), the North Tanzanian divergence zone (Africa) and the Basin and Range Province (North America). Using the records of direct and coda waves of regional earthquakes, the single scattering theory [ Aki, Chouet, 1975 ], the hybrid model from [ Zeng, 1991 ] and the approach described in [ Wennerberg, 1993 ], we estimated the seismic quality factor ( Q C ), frequency parameter ( n ), attenuation coefficient (δ), and total attenuation ( Q T ). In addition, we evaluated the contributions of two components into total attenuation: intrinsic attenuation ( Q i ), and scattering attenuation ( Q sc ). Values of Q C are strongly dependent on the frequency within the range of 0.2–16 Hz, as well as on the length of the coda processing window. The observed increase of Q C with larger lengths of the coda processing window can be interpreted as a decrease in attenuation with increasing depth. Having compared the depth variations in the attenuation coefficient (δ) and the frequency ( n ) with the velocity structures of the studied regions, we conclude that seismic wave attenuation changes at the velocity boundaries in the medium. Moreover, the comparison results show that the estimated variations in the attenuation parameters with increasing depth are considerably dependent on utilized velocity models of the medium. Lateral variations in attenuation of seismic waves correlate with the geological and geophysical characteristics of the regions, and attenuation is primarily dependent on the regional seismic activity and regional heat flow. The geological inhomogeneities of the medium and the age of crust consolidation are secondary factors. Our estimations of intrinsic attenuation ( Q i ) and scattering attenuation ( Q sc ) show that in all the three studied regions, intrinsic attenuation is the major contributor to total attenuation. Our study shows that the characteristics of seismic wave attenuation in the three different rift systems are consistent with each other, and this may suggest that the lithosphere in the zones of these different rift systems has been modified to similar levels.

Country
France
Subjects by Vocabulary

Microsoft Academic Graph classification: Seismic wave Coda Lithosphere Anelastic attenuation factor Rift Attenuation Attenuation coefficient Scattering theory Seismology Geology

ACM Computing Classification System: ComputingMilieux_MISCELLANEOUS

Keywords

north american basin and range province, seismic quality factor, Science, North American Basin and Range Province, heat flow, Baikal rift system, [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology, attenuation of seismic waves, east african rift system, East African rift system, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Earth-Surface Processes, [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, intrinsic attenuation, Q, Geophysics, baikal rift system, coda waves, seismicity, scattering attenuation, [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    2
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Average
Average
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