arXiv subjects

Claudio Satriano

Publications and source records attributed to Claudio Satriano.

2 recordsLinked to original sources

arXiv2024

surfQuake: A new Python toolbox for the workflow process of seismic sources

surfQuake is a new software designed to streamline the estimation of seismic source parameters. Its comprehensive set of toolboxes automate the determination of seismic arrival times, event association and locations, moment magnitude from P- or S- wave displacement spectra and moment tensor inversions within a Bayesian framework. surfQuake is programmed in Python 3 and offers the users the possibility of three programming levels for flexibility and customization. The core library allows users to integrate the core of surfQuake into their preexisting scripts, giving advanced users full control, while the Command Line Interface gives users access to an upper layer that simplifies the use of the core. Alternatively, surfQuake core is wrapped by a Graphical User Interface (GUI) and connected to a SQLite database making it accessible to users with little coding experience. The software has been fully tested with an earthquake cluster of more than 2000 events, that occurred in central Pyrenees in 2021-22. The source parameters retrieved from the cluster and the basic statistics associated with them are displayed using the surfQuake database toolbox. Additionally, we offer a web tutorial with the documentation of surfQuake and a set of usage examples for the three programming levels.

physics.geo-ph↗

arXiv2019

Self-similarity of low-frequency earthquakes

Low-frequency earthquakes are a particular class of slow earthquakes that provide a unique source of information on the mechanical properties of a subduction zone during the preparation of large earthquakes. Despite increasing detection of these events in recent years, their source mechanisms are still poorly characterised, and the relation between their magnitude and size remains controversial. Here, we present the source characterisation of more than 10,000 low-frequency earthquakes that occurred during tremor sequences in 2012-2016 along the Nankai subduction zone in western Shikoku, Japan. We show that the seismic moment versus corner frequency scaling for these events is compatible with an inverse of the cube law, as widely observed for regular earthquakes. Our result is thus consistent with shear rupture as the source mechanism for low-frequency earthquakes, and suggests that they obey to a similar physics of regular earthquakes, with self-similar rupture process and constant stress drop. Furthermore, when investigating the dependence of the stress drop value on the rupture speed, we found that low-frequency earthquakes might propagate at lower rupture velocity than regular earthquakes, releasing smaller stress drop.

physics.geo-ph↗