← Back to Sessions

Correlations and Change Points Identification in Crustal Anisotropy, b-Value and Vp/vs, Time Series During Seismic Swarm Occurrences in the Alto Tiberina Fault Zone (Italy)

Description: 

We computed different seismological parameters from the analysis of the waveforms recorded during the seismic swarms activity occurred along the Alto Tiberina Fault (ATF) and surrounding regions (Northern Apennines, Italy) in the period 2010-2015: crustal anisotropy (in terms of time delay between the two S-waves generated by the shear wave splitting), b-value of the Gutenberg-Richter law, and vp/vs ratio. We obtained three time series of the corresponding measures for each station of the Italian Seismic Network operating in the study area. However only three of them show enough points along the entire 6-year period to obtain robust time series. Due to the sparse presence of values in the time series we thus apply a weighted likelihood approach to homogenize them, and finally we looked for both correlations and change points in their temporal trends. The times corresponding to aforementioned variations in one or more parameters/stations are then tested to highlight the statistical significance of their occurrence. We merge all observations for getting a more constrained interpretation of the ATF seismicity evolution. The statistical approach presented in this study for comparing seismological time series could more generally find application in comparing other types of time series, and is especially suitable for those derived from unevenly sampled measurements.

Session: Advances in Operational and Research Analysis of Earthquake Swarms [Poster Session]

Type: Poster

Date: 5/3/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Lucia

Student Presenter: No

Invited Presentation: 

Authors