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Ítem A brittle failure model for long-period seismic events recorded at Turrialba Volcano, Costa Rica(American Geophysical Union, 2015-01-30) Eyre, Thomas; Bean, Christopher; DE BARROS, LOUIS; Martini, Francesca; Lokmer, Ivan; Mora Fernández, Mauricio Manuel; Pacheco, Javier F.; Soto, Gerardo J.A temporary seismic network, consisting of 23 broadband and six short-period stations, wasinstalled in a dense network at Turrialba Volcano, Costa Rica, between 8 March and 4 May 2011. During thistime 513 long-period (LP) events were observed. Due to their pulse-like waveforms, the hypothesis thatthe events are generated by a slow-failure mechanism, based on a recent new model by Bean et al. (2014), istested. A significant number (107) of the LPs are jointly inverted for their source locations and mechanisms,using full-waveform moment tensor inversion. The locations are mostly shallow, with depths < 800 m belowthe active Southwest Crater. The results of the decompositions of the obtained moment tensor solutions showcomplex source mechanisms, composed of high proportions of isotropic and low, but seemingly significant,proportions of compensated linear vector dipole and double-couple components. It is demonstrated that thiscan be explained as mode I tensile fracturing with a strong shear component. The source mechanism is furtherinvestigated by exploring scaling laws within the data. The LPs recorded follow relationships very similar tothose of conventional earthquakes, exhibiting frequency-magnitude and corner frequency versus magnituderelationships that can be explained by brittle failure. All of these observations indicate that a slow-failure sourcemodel can successfully describe the generation of short-duration LP events at Turrialba Volcano