Abstract
The Trecastagni Fault (TF) is a NNW-SSE tectonic structure inside Mt. Etna that is characterized by evident morphological scarps and normal and right-lateral type movements that directly affect roads and buildings. The TF has an important role in the instability that affects the south-eastern flank of Mt. Etna, and it represents part of the southern boundary of the unstable sector. Starting from 2005, the TF has been monitored using continuous wire extensometers and by carrying out periodic direct measurements across the northern and central sectors. From 2005 to September 2009, the measurements show that the TF has undergone continuous extension of about 2-3 mm/yr. During the October 2009 to January 2010 period, the creep rate of the TF reached up to 5.5 to 7.0 mm/yr, and this was accompanied by several shallow, low magnitude earthquakes that were felt by local people. This episode appears to be linked to the increase in the sliding velocity of the eastern flank that occurred during 2009.
Highlights
This study provides details of the 2005 to 2010 Trecastagni Fault (TF) displacements and seismicity, and discusses this behavior in the framework of the flank dynamics and volcanic activity of Mt
Several micro-earthquakes were recorded at this FER station. For five of these events, we obtained the direction of the seismic ray from particle motion analysis (Figure 6E,F) and the distance from S-P time lapse (Figure 6D); these analyses suggest that the source area of the earthquake was the northern sector of the TF
Previous studies that were performed by analyzing time series of interferometric synthetic aperture radar (InSAR) data measured movement of the TF of the order of 4 mm/yr from 1993 to 2008
Summary
Since 2005, the TF has been monitored using continuous wire extensometers and through periodic direct measurements across the discontinuity in the northern sector of the fault.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
