What is it about?

Earthquake source directivity is the focusing of the seismic energy due to the rupture propagation along the fault. We find that these events constitute 36% of the total and the rupture direction is aligned with the strikes of the Central Apennines.

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Why is it important?

We introduce a first-order classification of the directive events, based on the relations among the frequency bandwidth, the amplitude and the minimum frequency at which source directivity occurs.

Perspectives

Our results may provide useful insights to move towards parametrization of directivity within the empirical simulation of shaking scenarios in Central Italy using a non-ergodic approach.

Leonardo Colavitti
Istituto Nazionale di Geofisica e Vulcanologia

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This page is a summary of: Empirical Evidence of Frequency‐Dependent Directivity Effects from Small‐to‐Moderate Normal Fault Earthquakes in Central Italy, Journal of Geophysical Research Solid Earth, May 2022, American Geophysical Union (AGU), DOI: 10.1029/2021jb023498.
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