Moment tensor inversion for the source location and mechanism of long period (LP) seismic events from 2009 at Turrialba volcano, Costa Rica

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Title: Moment tensor inversion for the source location and mechanism of long period (LP) seismic events from 2009 at Turrialba volcano, Costa Rica
Authors: Eyre, Thomas S.
Bean, Christopher J.
De Barros, Louis
O'Brien, G. S.
Martini, Francesca
Lokmer, Ivan
et al.
Permanent link: http://hdl.handle.net/10197/5663
Date: 15-May-2013
Abstract: Long-period (LP) seismic events were recorded during the temporary installation of a broadband seismic network of 13 stations from March to September 2009 on Turrialba volcano, Costa Rica. Over 6000 LPs were extracted using a modified STA/LTA method and a family consisting of 435 similar LP events has been identified. For the first time at Turrialba volcano, full-waveform moment tensor inversion is performed to jointly determine the location and source mechanism of the events. The LPs in the family are likely to be caused by crack mechanisms dipping towards the southwest at angles of approximately 10 to 20°, located at shallow depths (< 800 m) below the active Southwest and Central craters. As the locations are so shallow, the most probable causes of crack mechanisms are hydrothermal fluids resonating within or 'pulsing' through a crack. The waveforms observed at the summit stations suggest a 'pulsing' mechanism, but source resonance with a high degree of damping is also possible.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2013 Elsevier
Keywords: Volcano;Seismicity;Long period (LP) events;Moment tensor inversion;Turrialba volcano
DOI: 10.1016/j.jvolgeores.2013.04.016
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Sciences Research Collection

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