Toward Source Region Tomography With Intersource Interferometry: Shear Wave Velocity From 2018 West Bohemia Swarm Earthquakes
| Autor: | Tom Eulenfeld |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Shear waves
010504 meteorology & atmospheric sciences FOS: Physical sciences Seismic interferometry Earthquake swarm 01 natural sciences swarm earthquakes Coda 551.22 Physics::Geophysics Physics - Geophysics Geochemistry and Petrology S-wave Earth and Planetary Sciences (miscellaneous) intersource interferometry cross correlation 0105 earth and related environmental sciences Attenuation Geophysics (physics.geo-ph) Interferometry Geophysics Shear (geology) interevent interferometry Space and Planetary Science shear wave velocity coda waves Seismology Geology |
| DOI: | 10.23689/fidgeo-4079 |
| Popis: | The concept of seismic interferometry embraces the construction of waves traveling between receivers or sources with cross-correlation techniques. In the present study cross-correlations of coda waves are used to measure travel times of shear waves between earthquake locations for five event clusters of the 2018 West Bohemia earthquake swarm. With the help of a high quality earthquake catalog, I was able to determine the shear wave velocity in the region of the five clusters separately. The shear wave velocities range between 3.5 km/s and 4.2 km/s. The resolution of this novel method is given by the extent of the clusters and better than for a comparable classical tomography. It is suggested to use the method in a tomographic inversion and map the shear wave velocity in the source region with unprecedented resolution. Furthermore, the influence of focal mechanisms and the attenuation properties on the polarity and location of the maxima in the cross-correlation functions is discussed. The intra-cluster ratio of P wave to S wave velocity is approximately fixed at 1.68. Version after peer-review |
| Databáze: | OpenAIRE |
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