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High frequency seismic sources characterize the areas of tectonic shortening in the Italian region

Le zone iell’area italiana soggette ad accorciamento tettonico sono caratterizzate da sorgenti sismiche ad alta frequenza

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Abstract

The systematic deviation of the magnitude of a single earthquake from the linear orthogonal regression between local magnitudeM L and coda duration magnitudeM d, calculated for the whole region, is used as a measure of the frequency content of the seismic sources in the Italian region. Predominantly high frequency events are found in the two areas of Quaternary tectonic shortening in North-Central Italy and in the Calabrian Arc. This result, confirmed by two independent statistical tests, is in agreement with the global pattern obtained from the study of the regression between body-wave magnitude,m b, and surface-wave magnitudeM s : systematic shift to high frequencies in the energy release of seismic sources located in subduction zones and to low frequencies in zones of spreading.

Riassunto

Lo scostamento sistematico della magnitudo di un singolo terremoto dalla regressione lineare ortogonale tra la magnitudo localeM L e la magnitudo da durataM d, calcolata per tutta la regione, viene usato come misura del contenuto spettrale delle sorgenti sismiche nella regione italiana. Gli eventi con radiazione predominante ad alta frequenza tendono a raggrupparsi in corrispondenza delle due aree di accorciamento tettonico Quaternario nell’Italia Centro-Nord e nell’Arco Calabro. Tale risultato, confermato da due tests statisticamente indipendenti, è in accordo con l’andamento globale, definito dall’analisi della regressione lineare tra magnitudo da onde di corpo,m b , e magnitudo da onde superficiali, Ms, che indica uno spostamento sistematico verso le alte frequenze nella radiazione delle sorgenti sismiche localizzate in zone di subduzione e verso le basse frequenze per quelle situate in zone di apertura.

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Authors and Affiliations

  1. Istituto di Geodesia e Geofisica, Universita degli Studi di Trieste Via Università, 7 - 34100, Trieste

    Giuliano F. Panza

  2. International Institute for Earthquake Prediction Theory and Mathematical Geophysics, Academy of Sciences of the USSR, 79-2, Varshavskoe Shosse, Moscow, URSS

    Albert Prozorov

  3. International Center for Earth, Environmental and Marine Sciences and Technologies of ICS Strada Costiera, 11 - 34100, Trieste

    Giuliano F. Panza & Albert Prozorov

Authors
  1. Giuliano F. Panza
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  2. Albert Prozorov
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Nella seduta del 12 gennaio 1991.

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Panza, G.F., Prozorov, A. High frequency seismic sources characterize the areas of tectonic shortening in the Italian region. Rend. Fis. Acc. Lincei 2, 107–116 (1991). https://doi.org/10.1007/BF03001415

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