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Carmona, E.
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- PublicationRestrictedMultiplet Focal Mechanisms from Polarities and Relative Locations: The Iznajar Swarm in Southern Spain(2009-12)
; ; ; ; ;Carmona, E.; Instituto Andaluz de Geofísica, Campus Universitario de Cartuja s/n, Universidad de Granada, Granada, Spain ;Stich, D; Instituto Andaluz de Geofísica, Campus Universitario de Cartuja s/n, Universidad de Granada, Granada, Spain ;Saccorotti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Ibanez, J; Instituto Andaluz de Geofísica, Campus Universitario de Cartuja s/n, Universidad de Granada, Granada, Spain; ; ; In April 1998, a swarm of 1800 microearthquakes near the village of Iznajar (southern Spain) was recorded at the Granada basin short-period seismic network. Focal mechanisms from local P-wave polarities are poorly constrained and cannot characterize the seismotectonics of the series. Here we combine polarity information and multiplet relocation to address this issue. We use waveform cross correlation on P and S arrivals to identify events with highly similar seismograms, group our detections into multiplet clusters, and invert the cross-correlation time delays to obtain precise relative locations. Relative locations have errors of several tens to a few hundreds of meters horizontally and vertically, and define strike and dip of active fault patches with an accuracy of 20°–30°. We introduce the multiplet fault plane orientations into focal mechanism inversion, now yielding mostly well-constrained solutions, in addition to resolving the nodal plane symmetry. We observe mainly north-south left-lateral strike-slip faulting and a few north-northwest–south-southeast normal faulting solutions, illustrating the kinematic complexity of the swarm, and pointing to a local deformation style different from the nearby Granada basin.163 22 - PublicationOpen AccessTwin digital short period seismic Array Experiment at Stromboli Volcano(1998)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;La Rocca, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Petrosino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Grozea, B.; Università di Salerno ;Maritato, L.; Università di Salerno ;Saccorotti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Simini, M.; Università di Salerno ;Ibanez, J.; Instituto Andaluz de Geofisica ;Alguacil, G.; Instituto Andaluz de Geofisica ;Carmona, E.; Instituto Andaluz de Geofisica ;Abril, M.; Instituto Andaluz de Geofisica ;Almendros, J.; Instituto Andaluz de Geofisica ;Ortiz, R.; Museo Naccional de Ciencias Naturales de Madrid ;Garcia, A.; Museo Naccional de Ciencias Naturales de Madrid ;Pingue, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Esposito, T.; Osservatorio Vesuviano; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Two small arrays composed by short period (1 Hz) digital seismic stations, with an aperture of approximately 400 meters, were set up at Stromboli volcano (one at semaforo Labronzo, the other at Ginostra- Timpone del Fuoco) with the purpose of the spatial location of the high frequency source of the explosion quakes. About 75 explosion-quakes were recorded at both arrays, and constitute the available data base. We have planned to apply the zero-lag cross-correlation technique to the whole data set in order to obtain back-azimuth and apparent slowness of the coherent seismic phases. A preliminary analysis for both arrays show that the predominant back-azimuth for the first phase is oriented in the direction of , but not strictly coincident to, the crater area. Moreover some back-scattered arrivals are quite evident in the seismogram.184 366 - PublicationOpen AccessImaging the buried rim of Campi flegrei caldera (Italy) from array analysis(2004-04-25)
; ; ; ; ; ; ;Nisii, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Saccorotti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Abril, M.; Instituto Andaluz de Geofisica , Granada, Spain ;Almendros, J.; Instituto Andaluz de Geofisica , Granada, Spain ;Carmona, E.; Instituto Andaluz de Geofisica , Granada, Spain ;Galluzzo, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; ; ; ; On September an extended active seismic survey(SERAPIS,Seismic Reflection Acquisition Project for Imaging Structure)was conducted in the Gulf of Naples and Pozzuoli with the aimof providing new insights on the Campi Flegrei caldera structure and of investigating its feeding system(fig.1).About3000air-gunsea-shots were shot(fig.3a,b,c).In the frame work of this project,anarray of 28 vertical-component and 4 three component sensors was deployed in the Solfatara crater(fig.2).The array had an aperture of about 200m,and receivers had a natural frequency of 1Hz.An example of the recorded wave forms is shown in figure 4.170 153 - PublicationOpen AccessA double Seismic Array Experiment on Mt. Etna(2000)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Castellano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Capello, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Giudicepietro, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;La Rocca, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Martini, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Petrosino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Saccorotti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Ibanez, J; Instituto Andaluz de Geofisica ;Abril, M.; Instituto Andaluz de Geofisica ;Almendros, J.; Instituto Andaluz de Geofisica ;Carmona, E.; Instituto Andaluz de Geofisica ;Martinez, C.; Instituto Andaluz de Geofisica ;Vilchez, E.; Instituto Andaluz de Geofisica ;Privitera, E.; Progetto POSEIDON – INGV ;Alparone, S.; Progetto POSEIDON – INGV ;Di Grazia, G.; Progetto POSEIDON – INGV ;Gresta, S.; Progetto POSEIDON – INGV; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; On September 1999 two seismic antennas (array) and a profile of 3-D stations equipped with short period seismometers were installed on Mt. Etna; Aims of the experiment were to investigate the structure and the polarisation parameters of the volcanic tremor wavefield radiated in eruptive conditions, and to measure the seismic velocities and attenuation in the shallow structure beneath the arrays. The first array was installed close to Pizzi Deneri Volcanological Observatory, East of the crater area; the second array was located close to Torre del Filosofo site, south of the crater area. The profile was set up close to the Pizzi Deneri array. It had a length of 600 meters and consisted of 16 short period 3- component stations. In addition, a circular array of 8 short period seismometers was set up around the main crater area (Fig. 1). Several tremor samples and explosions quakes were recorded in 10 days of operation . Spectrograms show predominant energy into 1-4 Hz frequency band. Slowness spectra indicate a predominant source of the tremor located at surface and coincident with the crater area. Polarisation analysis show that the direction of predominant motion is transverse with respect to the direction pointing to the active craters.223 126 - PublicationOpen AccessA seismic array on Mt. Vesuvius(1999)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Bianco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Castellano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Petrosino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Pingue, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Capello, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Esposito, T.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Augusti, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Saccorotti, G.; Università di Salerno ;La Rocca, M.; Università di Salerno ;Maresca, R.; Università di Salerno ;Galluzzo, D.; Università di Salerno ;Cirillo, A.; Università di Salerno ;Grozea, B.; Università di Salerno ;Ibanez, J.; Istituto Andaluz de Geofisica, Universidad de Granada ;Carmona, E.; Istituto Andaluz de Geofisica, Universidad de Granada ;Alguacil, G.; Istituto Andaluz de Geofisica, Universidad de Granada; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; In November 1997 a seismic antenna (array) of short period seismometers was installed on the south-western flank of Mt. Vesuvius; aim of the experiment was to test the use of non-conventional devices for the seismic monitoring of this volcano. In 7 months local seismicity, regional earthquakes and samples of seismic noise were recorded by the array and organised in a data base. Local earthquakes and seismic noise have been analysed with array techniques to investigate the spectral, kinematic and polarization properties of the wavefield. Preliminary results show that the backazimuth of local earthquakes is oriented in the direction of the crater area. For some events, the source location has been constrained using a simplified back propagation in a 2-D velocity structure. The noise wavefield is characterized by the predominance of a sustained low frequency component (< 1Hz) whose source is located S-SE of the array. This low frequency signal has been interpreted as associated to the sea-loading in the gulf of Naples.193 260