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Crustal and upper-mantle structure in the Eastern Mediterranean from the analysis of surface wave dispersion curves (2006)

Di Luccio, F. ; Pasyanos, M. E.

Blackwell Publishing

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Publication Date: 2017-04-04

Description: The dispersive properties of surface waves are used to infer earth structure in the Eastern Mediterranean region. Using group velocity maps for Rayleigh and Love waves from 7-100 s, we invert for the best 1D crust and upper-mantle structure at a regular series of points. Assembling the results produces a 3D lithospheric model, along with corresponding maps of sediment and crustal thickness. A comparison of our results to other studies finds the uncertainties of the Moho estimates to be about 5 km. We find thick sediments beneath most of the Eastern Mediterranean basin, in the Hellenic subduction zone and the Cyprus arc. The Ionian Sea is more characteristic of oceanic crust than the rest of the Eastern Mediterranean region as demonstrated in particular by the crustal thickness. We also find significant crustal thinning in the Aegean Sea portion of the back-arc, particularly towards the south. Notably slower S-wave velocities are found in the upper-mantle, especially in the northern Red Sea and Dead Sea Rift, central Turkey, and along the subduction zone. The low velocities in the upper-mantle that span from North Africa to Crete, in the Libyan Sea, might be an indication of serpentinized mantle from the subducting African lithosphere. We also find evidence of a strong reverse correlation between sediment and crustal thickness which, while previously demonstrated for extensional regions, also seems applicable for this convergence zone.

Description: Published

Description: 1139–1152

Description: JCR Journal

Description: reserved

Keywords: surface waves ; Eastern Mediterranean ; lithosphere ; Moho depth ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Type: article

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Time reverse location of seismic long-period events recorded on Mt Etna (2012)

O’Brien, G. S. ; Lokmer, I. ; De Barros, L. ; [et al.]

Wiley

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Publication Date: 2017-04-04

Description: We present the first application of a time reverse location method in a volcanic setting, for a family of long-period (LP) events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From 2008 June 18 to July 3, 50 broad-band seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of LP events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two LP families we first applied the method to two synthetic data sets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.

Description: Published

Description: 452-462

Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive

Description: JCR Journal

Description: reserved

Keywords: Volcano seismology ; Computational seismology ; Wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

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3

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Depth-dependent intrinsic and scattering seismic attenuation in north central Italy (2011)

Del Pezzo, E. ; Bianco, F. ; Marzorati, S. ; [et al.]

Wiley

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Publication Date: 2017-04-04

Description: In this study the attenuation mechanism of seismic wave energy in north central Italy is estimated using low-magnitude earthquake local data recorded at six stations managed by INGV. Most of the analysed events are located along the Alpine chain in the zone of Iseo and Garda lakes, while a minor part in the Po valley. The zone investigated is characterized by the occurrence of significantly intense earthquakes (magnitude up to 6.6) the most recent occurred in 2004 close to the city of Sal`o on the coast of the Garda lake (Mw = 5.0). Due to the high population density and presence of industrial activity the investigated area is characterized by a high seismic risk. First, the ordinary Multiple Lapse Time Window Analysis (MLTWA) method is applied in the assumption of uniformvelocity and scattering and the couple of B0, the seismic albedo and Le−1, the extinction length inverse (corresponding to the total attenuation coefficient) is calculated in the frequency bands of 1.5, 3, 6 and 12 Hz. To retrieve more realistic estimates, the obtained values of B0 and Le−1 are corrected taking into account the effects of a depth-dependent earth model, consisting of an earth structure characterized by a transparent upper mantle and a heterogeneous crust. We find that the corrected intrinsic and scattering attenuation parameters (which are proportional to the inverse of the intrinsic/scattering quality factors, QI−1 and Qs−1) are strongly frequency dependent, with a prevalence of scattering attenuation over the intrinsic dissipation. The corrected and uncorrected values of total Q are in agreement with the total Q values obtained with different approaches for the same area.

Description: Published

Description: 3.1. Fisica dei terremoti

Description: JCR Journal

Description: reserved

Keywords: Seismic Attenuation ; Coda Waves ; Wave Scattering and Diffraction ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

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4

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Time reverse location of seismic long-period events recorded on Mt Etna (2011)

O’Brien, G. S. ; Lokmer, I. ; De Barros, L. ; [et al.]

Wiley

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Publication Date: 2017-04-04

Description: We present the first application of a time reverse location method in a volcanic setting, for a family of long-period (LP) events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From 2008 June 18 to July 3, 50 broad-band seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of LP events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two LP families we first applied the method to two synthetic data sets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.

Description: In press

Description: (11)

Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive

Description: JCR Journal

Description: reserved

Keywords: Volcano seismology ; Computational seismology ; Wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

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5

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Economic Development and Cultural Change

University of Chicago Press | JSTOR

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1.1952 – (older than 6 years)

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Publisher: University of Chicago Press , JSTOR

Print ISSN: 0013-0079

Electronic ISSN: 1539-2988

Topics: Geography , Economics

Keywords: JSTOR Archive Collection Business II

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Journal of Law and Economics, The

University of Chicago Press | JSTOR

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1.1958 – (older than 6 years)

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Publisher: University of Chicago Press , JSTOR

Print ISSN: 0022-2186

Electronic ISSN: 1537-5285

Topics: Law , Economics

Keywords: JSTOR Archive Collection Business II

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Financial Management (ältere Jahrgänge via JSTOR)

Wiley | Financial Management Association International | JSTOR

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1(1).1972 – (older than 4 years)

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Publisher: Wiley , Financial Management Association International , JSTOR

Print ISSN: 0046-3892

Electronic ISSN: 1755-053X

Topics: Economics

Keywords: JSTOR Archive Collection Business II

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Applied Economic Perspectives and Policy

Wiley | JSTOR | formerly Oxford University Press (OUP)

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10(1).1988 –

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Formerly as: Illinois Agricultural Economics; North Central Journal of Agricultural Economics; Review of Agricultural Economics (1961–2009)

Publisher: Wiley , JSTOR , formerly Oxford University Press (OUP)

Print ISSN: 0191-9016 , 1058-7195 , 2040-5790

Electronic ISSN: 1467-9353 , 2040-5804

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics

Keywords: JSTOR Archive Collection Business II

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