Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8010

Authors: De Lauro, E.*
Falanga, M.*
Petrosino, S.*
Title: Study on the Long-Period source mechanism at Campi Flegrei (Italy)
Title of journal: Physics of the Earth and Planetary Interiors
Series/Report no.: /206-207 (2012)
Publisher: Elsevier Science Limited
Issue Date: 7-Jul-2012
DOI: 10.1016/j.pepi.2012.06.006,
URL: http://www.sciencedirect.com/science/article/pii/S0031920112001100
Keywords: Lp sources
Poissonian occurrence
Tidal modulation
Abstract: The source properties of the Long-Period events that occurred at Campi Flegrei Caldera (Italy) during the 2004–2006 ground uplift episode are investigated by analyzing the temporal release of seismic energy, amplitude distribution and inter-event occurrence time. Moreover, an entropy-based decomposition method is applied to identify the simpler waveforms thought to be representative of the source mechanism of Long-Period events. On the basis of the outcomes, we propose that the main part of these events is the result of a source process triggered by a mechanism of fluid charge/discharge, which causes pressure drop in a main branch of a dentritic network of the hydrothermal system. In this model, the rate of the Poissonian process (about 15 min), which drives the occurrence of the Long-Period events, provides the average recharge time of the system up to the critical condition. A partial shunting of the fluid flow away from the main conduit activates the ”resonance” of a second branch, spatially separated from the first one. This is a process that occurs whenever the fluid pressure exceeds a critical value and produces less energetic Long-Period events. The mechanism of pressure variation in the two conduits generates signals with preferred amplitude scales, described by a bi-lognormal distribution. From a dynamical point of view, Long-Period events result well described by a low-dimensional dynamical system. Finally, the time pattern of the energy release and its correlation with the diurnal solid earth tide suggest that the whole mechanism of fluid charge/discharge is likely modulated by tidal stress variation.
Appears in Collections:Papers Published / Papers in press
04.06.08. Volcano seismology

Files in This Item:

File Description SizeFormatVisibility
DeLauro_2012.pdfArticle2.19 MBAdobe PDFonly authorized users View/Open
DeLauro_manuscript_2012.pdfManuscript2.31 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License
Creative Commons


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Share this record
Del.icio.us

Citeulike

Connotea

Facebook

Stumble it!

reddit


 

Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA