Imaging the shallow crust with local and regional earthquake tomography

Cemal B. Biryol, Garrett M. Leahy, George Zandt, Susan Beck

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

While active-source imaging (seismic reflection, refraction) is typically used to image the shallow crust, these techniques tend to suffer from energy penetration problems in complex tectonic regimes, resulting in poor imaging. Further, active sources (such as air guns or vibroseis) tend to be band limited, resulting in poor signal-to-noise ratio at low frequencies (1-10 Hz). Recent studies suggest that earthquake data may be able to solve these imaging problems. However, conventional earthquake tomography typically aims to image the upper mantle and lithosphere, where typical station spacing (tens of km) and array aperture (hundreds of km) have resulted in the maximum resolution. In this study, we take advantage of the small-scale and 250 m station spacing of the LaBarge Passive Seismic Experiment to determine whether local and regional earthquake tomographies can be used to constrain structure in the top 5 km of the crust. We also study how the inclusion of finite-frequency effects impacts the final images. Our results indicate that local and regional events provide substantial improvements over teleseismic events alone, with approximately 500 m resolution both vertically and laterally in the upper most 5 km. We also find that inclusion of finite-frequency data between 1 and 10 Hz plays a key role in maintaining resolution in the shallowest portion of the model.

Original languageEnglish (US)
Pages (from-to)2289-2306
Number of pages18
JournalJournal of Geophysical Research: Space Physics
Volume118
Issue number5
DOIs
StatePublished - 2013

Fingerprint

tomography
Tomography
crusts
Earthquakes
earthquakes
crust
Imaging techniques
earthquake
spacing
stations
inclusions
air gun
vibroseis
Tectonics
Refraction
refraction
lithosphere
signal-to-noise ratio
seismic reflection
upper mantle

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Imaging the shallow crust with local and regional earthquake tomography. / Biryol, Cemal B.; Leahy, Garrett M.; Zandt, George; Beck, Susan.

In: Journal of Geophysical Research: Space Physics, Vol. 118, No. 5, 2013, p. 2289-2306.

Research output: Contribution to journalArticle

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