Constraining nodal plane orientation and Q from a pulse width method. Application to the Amatrice-Visso-Norcia Sequence (2016-17)

Clicks: 18
ID: 320830
2026
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Steady

Ranked #180 of 338 articles by views in geophysical journal international

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 338 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Summary A new inversion technique, aimed at inferring the fault plane orientation and a frequency-independent quality factor of P-waves (${Q}_P$) at each recording site, from the inversion of rise times $( \tau )$ and pulse widths $( {{\rm{\Delta }}T} )$ of a small magnitude earthquake recorded on a regional scale, has been developed. The proposed method enables us to obtain a misfit between data and their theoretical estimates smaller than the mean error of the data, which was the main limitation of previous approaches based on the assumption of a homogeneous Q. To this end, the theoretical equations describing the relations among data and model parameters, inferred in previous studies, have been adapted to the case of a heterogeneous ${Q}_P$-structure. For each of the two nodal planes inferred from focal mechanisms, an iterative two-step inversion technique has been implemented. At the first step, fault radius L and a background homogeneous ${Q}_{\it{back}}$ are inferred using a grid-search method. At the second step, the residuals between data and their theoretical estimates are used to obtain a new perturbed dataset and to compute a ${Q}_P$ correction at each station. Finally, the best-fitting nodal plane is selected via an F-Test at a fixed level of significance. The application of the method to a dataset of 21 earthquakes (3 ≤ ML ≤ 4) of the 2016 Amatrice–Visso–Norcia (AVN) sequence in Central Italy, allows to reduce the misfit between data and model to values less than the average error on data for all the studied events and enables the fault plane discrimination for a subset of 13 events. Inferred fault plane orientations indicate that studied events can be related to a complex system of synthetic and antithetic normal faults generally oriented along the strike of the Apennines (NNW-SSE); this consideration has been confirmed by previous works. Site-${Q}_P$ inferred values are in the same range as those obtained in previous studies in the same area. The comparison with S-wave attenuation studies indicate that ${Q}_P\ $<$\ {Q}_S$ for the AVN sequence, in agreement with the results obtained from the analysis of the 1997 Umbria-Marche seismic sequence, occurred in a limited region of the same area of the AVN sequence.
Reference Key
openalex_W7168176545 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Fabio Perrucci, Salvatore de Lorenzo, Aldo Zollo
Are you one of these authors? Claim your profile
Journal geophysical journal international
Year 2026
DOI
10.1093/gji/ggag276
URL
https://doi.org/10.1093/gji/ggag276
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.