EASOt-AP: An open-source MATLAB package to estimate the seismic moment, rupture radius, and stress-drop of earthquakes from time-dependent P-wave displacements. (February 2023)

• Record Type: Journal Article
• Authors: Nazeri, Sahar; Zollo, Aldo
• Is Part Of: Computers & geosciences. Volume 171(2023)
• Publication Date: 2023-02
• Subjects: Open-source MATLAB code -- Signal processing -- Earthquake source -- P-wave displacement -- Time domain technique; Environmental policy -- Periodicals; 550.5
• DOI: 10.1016/j.cageo.2022.105293
• Languages: English
• ISSNs: 0098-3004

Abstract

Abstract: We developed a MATLAB package, to rapidly obtain the apparent EArthquake SOurce time function using the Average of near-source P-wave displacement records (EASOt-AP) and to estimate the source parameters of the seismic moment, the rupture radius, and the average static stress drop. The algorithm implemented in this package is based on a rapid and straightforward methodology that is recently developed by Zollo et al. (2021). To this purpose, EASOt-AP models a LPDT curve, which is the average P-wave displacement versus time in the logarithm scale. In this paper, the performance of the EASOt-AP has been shown by evaluating the strong motion data recorded in the near-source range of small magnitude events (2 = Mw ≤ 3) that occurred in the Irpinia region, southern Italy. The source parameters follow a self-similar, constant-stress-drop scaling with a relatively low average stress drop of about 01-0.2 MPa. This Tool is designed for an easy use, and all steps of data processing are performed completely within the numerical environment of MATLAB. Highlights: A MATLAB tool is designed for easy use, to rapidly characterize the earthquake source. Earthquake source parameters are estimated using the time evolution of the P-wave displacement signals. A parametric modelling technique in the time-domain is implemented to obtain the source time function of the earthquake.