Source mechanism of long period events recorded by a high density seismic network during the 2008 eruption on Mount Etna

Files in This Item:
 File SizeFormat
Downloadsource_mech_of_lp.pdf1.78 MBAdobe PDF
Title: Source mechanism of long period events recorded by a high density seismic network during the 2008 eruption on Mount Etna
Authors: De Barros, LouisLokmer, IvanBean, Christopher J.O'Brien, G. S.Zuccarello, Lucianoet al.
Permanent link:
Date: Jan-2011
Online since: 2014-02-28T09:46:25Z
Abstract: 129 Long Period (LP) events, divided into two families of similar events, were recorded by the 50 stations deployed on Mount Etna in the second half of June 2008. During this period lava was flowing from a lateral fracture after a summit strombolian eruption. In order to understand the mechanisms of these events, we perform moment tensor inversions. Inversions are initially kept unconstrained to estimate the most likely mechanism. Numerical tests show that unconstrained inversion leads to reliable moment tensor solutions because of the close proximity of numerous stations to the source positions. However, single forces cannot be accurately determined as they are very sensitive to uncertainties in the velocity model. Constrained inversions for a crack, a pipe or an explosion then allow us to accurately determine the structural orientations of the source mechanisms. Both numerical tests and LP event inversions emphasise the importance of using stations located as close as possible to the source. Inversions for both families show mechanisms with a strong volumetric component. These events are most likely generated by cracks striking SW-NE for both families and dipping 70 degrees SE (Family 1) and 50 degrees NW (Family 2). For Family 1 events, the crack geometry is nearly orthogonal to the dike-like structure along which events are located, while for Family 2 the location gave two pipe-like bodies which belong to the same plane as the crack mechanism. The orientations of the cracks are consistent with local tectonics, which shows a SW-NE weakness direction. The LP events appear to be a response to the lava fountain occurring on the 10th of May, 2008 as opposed to the flank lava flow.
Type of material: Journal Article
Publisher: American Geophysical Union
Journal: Journal of Geophysical Research-Solid Earth
Volume: 116
Issue: B1
Start page: B01034
Copyright (published version): 2011, American Geophysical Union
Keywords: Long-period eventsStombolian eruptionMoment tensorEvent inversionsCracksLavaTectonics
DOI: 10.1029/2010JB007629
Other versions:
Language: en
Status of Item: Peer reviewed
This item is made available under a Creative Commons License:
Appears in Collections:Earth Sciences Research Collection

Show full item record

Citations 20

Last Week
Last month
checked on Sep 12, 2020

Page view(s) 50

Last Week
Last month
checked on Jul 3, 2022


checked on Jul 3, 2022

Google ScholarTM



If you are a publisher or author and have copyright concerns for any item, please email and the item will be withdrawn immediately. The author or person responsible for depositing the article will be contacted within one business day.