Work

Influence of Fluids and Geological Setting on Source Parameters of the 2010–2014 Pollino (Italy) Seismic Swarm

Year: 2025

Type: article

Abstract: ABSTRACT We analyse variations in Brune stress drop (Δσ), apparent stress (τa) and Savage–Wood radiation efficiency (ηsw = τa/Δσ) during the 2010–2014 Pollino seismic swarm (Southern Apennines, Italy). This prolonged sequence included multiple swarms, with a Mw 5.2 event in October 2012, preceded by a Mw 4.3 event in May 2012, followed by aseismic slip. Seismicity clusters into two groups: one near the Mw 5.2 event and another around the Mw 4.3 event, raising questions about fault geometry and dip. Spectral analysis of 106 earthquakes (ML > 2.2) shows Δσ and τa scale with magnitude, while ηsw does not. The Savage–Wood radiation efficiency ranges from 0.08 to 0.50, averaging 0.23, aligning with the pure omega‐square model. Previous studies suggest fluids influence swarm nucleation. By integrating our results with geophysical data, we propose that high ηsw events originate in zones of elevated pore pressure, helping constrain the fault plane of the east.

Source: Terra Nova

DOI: 10.1111/ter.12781

Authors: Giovanna Calderoni, Michela Ponte, Mario La Rocca, Rita Di Giovambattista

Institutions: Istituto Nazionale di Geofisica e Vulcanologia, University of Calabria

Language: English

Topic: earthquake and tectonic studies

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,720

OpenAlex ID: W4410510381

FWCI: 1.927

Cites: 49

Cited by: 3

Related to: 10