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  • American Association for the Advancement of Science (AAAS)  (1)
  • American Geophisycal Union  (1)
  • Federazione Italiana di Scienze della Terra  (1)
  • 1
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    Nucleation speed limit on remote fluid-induced earthquakes (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-08-24
    Description: Earthquakes triggered by other remote seismic events are explained as a response to long-traveling seismic waves that temporarily stress the crust. However, delays of hours or days after seismic waves pass through are reported by several studies, which are difficult to reconcile with the transient stresses imparted by seismic waves. We show that these delays are proportional to magnitude and that nucleation times are best fit to a fluid diffusion process if the governing rupture process involves unlocking a magnitude-dependent critical nucleation zone. It is well established that distant earthquakes can strongly affect the pressure and distribution of crustal pore fluids. Earth’s crust contains hydraulically isolated, pressurized compartments in which fluids are contained within low-permeability walls. We know that strong shaking induced by seismic waves from large earthquakes can change the permeability of rocks. Thus, the boundary of a pressurized compartment may see its permeability rise. Previously confined, overpressurized pore fluids may then diffuse away, infiltrate faults, decrease their strength, and induce earthquakes. Magnitude-dependent delays and critical nucleation zone conclusions can also be applied to human-induced earthquakes.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Regional body-wave attenuation using a coda source normalization method: application to MEDNET records of earthquakes in Italy (2007)
    American Geophisycal Union
    Details
    Publication Date: 2017-04-03
    Description: We develop a new methodology to determine apparent attenuation for the regional seismic phases Pn, Pg, Sn, and Lg using coda-derived source spectra. The apparent Q, combining path and site attenuation, is determined from the difference between the geometrical spreading-corrected amplitude and the independently determined source spectra derived from the coda methodology. We apply the technique to 50 earthquakes with magnitudes greater than 4 in central Italy as recorded by MEDNET broadband stations around the Mediterranean at local-to-regional distances. A power law attenuation of the form Q(f) = Qof^gamma fit all the phases quite well over the 0.5 to 8 Hz band. The measured apparent Q values are quite repeatable from event to event. Finding the attenuation function in this manner guarantees a close match between inferred source spectra from direct waves and coda techniques. This is important if coda and direct wave amplitudes are to produce consistent seismic results.
    Description: Published
    Description: L10308
    Description: 3.1. Fisica dei terremoti
    Description: JCR Journal
    Description: reserved
    Keywords: wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 3
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    Il terremoto di Haiti del 12 Gennaio 2010 (Mw 7.0) (2011)
    Federazione Italiana di Scienze della Terra
    Details
    Publication Date: 2017-04-04
    Description: Il terremoto di Haiti del 12 gennaio 2010 (Mw 7.0) si è verificato alle ore 16:53:09 locali (21:53:09 UTC). L’epicentro è stato localizzato a circa 25 chilometri da Port-au-Prince, la capitale, con una profondità ipocentrale di 13 km (fonte United States Geological Survey, USGS). USGS ha localizzato sei repliche nelle due ore successive al terremoto principale, di magnitudo compresa tra 4.5 e 5.9. (5.9, 5.5, 5.1, 4.8, 4.5, e 4.5). Nelle prime nove ore successive all’evento principale, sono state registrate 26 repliche di magnitudo M ≥ 4.2, dodici delle quali di magnitudo M ≥ 5.0.
    Description: Published
    Description: 42-46
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: N/A or not JCR
    Description: open
    Keywords: HAITI ; TERREMOTO 12 GENNIO ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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