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The Calabrian Arc: three-dimensional modelling of the subduction interface
Francesco E Maesano1, Mara M Tiberti2, Roberto Basili2
1Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy. francesco.maesano@ingv.it.
Scientific Reports
|August 23, 2017
Summary
The Calabrian Arc subduction zone
Area of Science:
- * Geophysics and Tectonics
- * Subduction Zone Dynamics
Background:
- * The Calabrian Arc is a unique subduction zone with a short slab segment, thick accretionary wedge, and old oceanic crust.
- * Despite high convergence rates and deep seismicity, its shallow interface exhibits low seismic activity, yet is linked to historical large earthquakes and tsunamis.
Purpose of the Study:
- * To develop a comprehensive 3D geological model of the Calabrian Arc subduction zone.
- * To understand the geodynamics and seismic/tsunami hazards of this complex Mediterranean tectonic region.
Main Methods:
- * Interpreted 54 seismic reflection lines (8,658 km) to reconstruct the shallow slab interface (<20 km) and accretionary wedge.
- * Constrained the deeper slab surface (40-350 km) using seismicity distribution.
- * Interpolated shallow and deep data to create a seamless 3D slab model.
Main Results:
- * Generated a detailed 3D slab model of the Calabrian Arc subduction interface.
- * Identified geometric details, lateral terminations, down-dip curvature, and a significant slab tear at 70-100 km depth.
Conclusions:
- * The 3D slab model provides crucial insights into the geodynamics of the Calabrian Arc.
- * The model aids in assessing seismic and tsunami hazards in this tectonically significant Mediterranean area.
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