Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 10, Pages 5000-5008Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL068546
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Funding
- FIRB-Abruzzo' Project - Ministero dell'Istruzione dell'Universita e della Ricerca [UR7]
- Czech Science Foundation [14-04372S]
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The aim of this study is to investigate the directivity effects of similar to 250 aftershocks (magnitudes 3-5.5) of the M-w 6.1 2009 L'Aquila earthquake (central Italy). To this end, we estimate the apparent source spectra at each station removing path and site effects inferred by standard Generalized Inversion Technique. Then, we evaluate the residuals between the apparent source spectra and the event mean source spectrum at selected frequencies. We investigate azimuthal and frequency dependence of the residuals for 40 events with the best station coverage. For most of events with the strongest directivity effect (M-w 3.4-4.0), we observe a remarkable decrease of the directivity amplification at high frequencies, which has not yet been documented for such relatively small-magnitude events. Since there is negligible distance dependence, we ascribe this observation to a source phenomenon such as significant small-scale rupture propagation complexity.
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