Publication Date:
2021-12-22
Description:
Seismic activity in volcanic settings could be the signature of processes that include
magma dynamics, hydrothermal activity and geodynamics. The main goal of this study is
to analyze the seismicity of Lipari Island (Southern Tyrrhenian Sea) to characterize the
dynamic processes such as the interaction between pre-existing structures and
hydrothermal processes affecting the Aeolian Islands. We deployed a dense seismic
array of 48 autonomous 3-component nodes. For the first time, Lipari and its hydrothermal
field are investigated by a seismic array recording continuously for about a month in late
2018 with a 0.1–1.5 km station spacing. We investigate the distribution and evolution of the
seismicity over the full time of the experiment using self-organized maps and automatic
algorithms. We show that the sea wave motion strongly influences the background seismic
noise. Using an automatic template matching approach, we detect and locate a seismic
swarm offshore the western coast of Lipari. This swarm, made of transient-like signals also
recognized by array and polarization analyses in the time and frequency domains, is
possibly associated with the activation of a NE-SW fault. We also found the occurrence of
hybrid events close to the onshore Lipari hydrothermal system. These events suggest the
involvement of hot hydrothermal fluids moving along pre-existing fractures. Seismological
analyses of one month of data detect signals related to the regional tectonics,
hydrothermal system and sea dynamics in Lipari Island.
Description:
Published
Description:
678581
Description:
4T. Sismicità dell'Italia
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
