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  1. Article ; Online: Space-time variations of the Umbria-Marche region instrumental seismicity

    F. Vetrano / S. Santini / S. Barba / A. Megna

    Annals of Geophysics, Vol 43, Iss

    2000  Volume 5

    Abstract: In the Umbria-Marche region, space and time variations concerning the b value were studied by instrumental seismicity from January 1987 to May 1999, according to the Bender method. Data were divided into two partially independent data sets. The first set, ...

    Abstract In the Umbria-Marche region, space and time variations concerning the b value were studied by instrumental seismicity from January 1987 to May 1999, according to the Bender method. Data were divided into two partially independent data sets. The first set, (January 1987 - December 1996), does not include the Colfiorito seismic sequence that occurred in the autumn of 1997. The second data set includes all events from January 1987 to May 1999. Using square cell dimensions of 80, 40 and 20 km, the examined area was divided respectively into three grids. The b value was estimated for each cell using the first data set, thus allowing us to reveal b value space variations and determine the resolution. To evaluate the stability of our result we estimated the b value on the basis of historical seismicity within the region. Several synthetic tests were also performed to estimate the stability of the Bender method and to verify its consistency with respect to other methods commonly used. Finally we estimated the b values using the second data set to prove the time variations. Results from the area examined show that the lowest possible spatial resolution of the b value is about 40 km and that there is a correlation between the b value pattern and the main active tectonic structures of the area. The most important time variations occur within the Colfiorito area, in which the b value drops significantly within the second data set. Results suggest two different ways of strain release: the first one produces continuous seismicity that spreads all over the examined area, while the second, which concerns stronger earthquakes, is localized.
    Keywords b value ; seismicity ; Apennines ; Geophysics. Cosmic physics ; QC801-809 ; Physics ; QC1-999 ; Science ; Q ; DOAJ:Geophysics and Geomagnetism ; DOAJ:Earth and Environmental Sciences
    Subject code 333
    Language English
    Publishing date 2000-06-01T00:00:00Z
    Publisher Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: A perturbative solution of the power-law viscoelastic constitutive equation for lithospheric rocks

    S. Santini / T. Lenci / M. Dragoni / F. Vetrano

    Annals of Geophysics, Vol 39, Iss

    1996  Volume 6

    Abstract: A power-law, viscoelastic constitutive equation for lithospheric rocks, is considered. The equation is a nonlinear generalization of the Maxwell constitutive equation, in which the viscous deformation depends on the n-th power of deviatoric stress, and ... ...

    Abstract A power-law, viscoelastic constitutive equation for lithospheric rocks, is considered. The equation is a nonlinear generalization of the Maxwell constitutive equation, in which the viscous deformation depends on the n-th power of deviatoric stress, and describes a medium which is elastic with respect to normal stress, but relaxes deviatoric stress. Power-law exponents equal to 2 and 3, which are most often found in laboratory experiments, are considered. The equation is solved by a perturbative method for a viscoelastic layer subjected to a constant, extensional or compressional, strain rate and yields stress as a function of time, temperature and rock composition. The solution is applied to an ideal extensional boundary zone and shows that the base of the crustal seismogenic layer may be deeper than predicted by a linear rheology.
    Keywords lithosphere rheology ; viscoelasticity ; plate boundaries ; Geophysics. Cosmic physics ; QC801-809 ; Physics ; QC1-999 ; Science ; Q ; DOAJ:Geophysics and Geomagnetism ; DOAJ:Earth and Environmental Sciences
    Language English
    Publishing date 1996-06-01T00:00:00Z
    Publisher Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: A numerical study for convection in a cylindrical model with continuously varying viscosity

    F. Vetrano / S. Santini / A. Megna / F. Fanucci

    Annals of Geophysics, Vol 39, Iss

    1996  Volume 3

    Abstract: In the framework of a cylindrical symmetry model for convective motions in the asthenosphere, a new profile for the viscosity coefficient depending on depth is suggested here. The numerical elaboration of the above mentioned model leads to interesting ... ...

    Abstract In the framework of a cylindrical symmetry model for convective motions in the asthenosphere, a new profile for the viscosity coefficient depending on depth is suggested here. The numerical elaboration of the above mentioned model leads to interesting results which fit well with experimental observations. In particular these continuously varying viscosity solutions probably describe the convective motions within the Earth better than simple constant viscosity solutions. Consequently the temperature values seem to be a realistic representation of the possible thermal behaviour in the upper mantle.
    Keywords convection currents ; viscosity ; Geophysics. Cosmic physics ; QC801-809 ; Physics ; QC1-999 ; Science ; Q ; DOAJ:Geophysics and Geomagnetism ; DOAJ:Earth and Environmental Sciences
    Language English
    Publishing date 1996-06-01T00:00:00Z
    Publisher Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Search for Gravitational Waves Associated with Gamma-Ray Bursts Detected by Fermi and Swift During the LIGO-Virgo Run O3a

    Collaboration, The LIGO Scientific / R.Abbott, the Virgo Collaboration / T.D.Abbott, / S.Abraham, / F.Acernese, / K.Ackley, / C.Adams, / R.X.Adhikari, / V.B.Adya, / C.Affeldt, / M.Agathos, / K.Agatsuma, / N.Aggarwal, / O.D.Aguiar, / A.Aich, / L.Aiello, / A.Ain, / P.Ajith, / G.Allen, /
    A.Allocca, / P.A.Altin, / A.Amato, / S.Anand, / A.Ananyeva, / S.B.Anderson, / W.G.Anderson, / S.V.Angelova, / S.Ansoldi, / S.Antier, / S.Appert, / K.Arai, / M.C.Araya, / J.S.Areeda, / M.Arene, / N.Arnaud, / S.M.Aronson, / Y.Asali, / S.Ascenzi, / G.Ashton, / M.Assiduo, / S.M.Aston, / P.Astone, / F.Aubin, / P.Aufmuth, / K.AultONeal, / C.Austin, / V.Avendano, / S.Babak, / P.Bacon, / F.Badaracco, / M.K.M.Bader, / S.Bae, / A.M.Baer, / J.Baird, / F.Baldaccini, / G.Ballardin, / S.W.Ballmer, / A.Bals, / A.Balsamo, / G.Baltus, / S.Banagiri, / D.Bankar, / R.S.Bankar, / J.C.Barayoga, / C.Barbieri, / B.C.Barish, / D.Barker, / K.Barkett, / P.Barneo, / F.Barone, / B.Barr, / L.Barsotti, / M.Barsuglia, / D.Barta, / J.Bartlett, / I.Bartos, / R.Bassiri, / A.Basti, / M.Bawaj, / J.C.Bayley, / M.Bazzan, / B.B'ecsy, / M.Bejger, / I.Belahcene, / A.S.Bell, / D.Beniwal, / M.G.Benjamin, / J.D.Bentley, / F.Bergamin, / B.K.Berger, / G.Bergmann, / S.Bernuzzi, / C.P.L.Berry, / D.Bersanetti, / A.Bertolini, / J.Betzwieser, / R.Bhandare, / A.V.Bhandari, / A.Bianchi, / J.Bidler, / E.Biggs, / I.A.Bilenko, / G.Billingsley, / R.Birney, / O.Birnholtz, / S.Biscans, / M.Bischi, / S.Biscoveanu, / A.Bisht, / G.Bissenbayeva, / M.Bitossi, / M.A.Bizouard, / J.K.Blackburn, / J.Blackman, / C.D.Blair, / D.G.Blair, / R.M.Blair, / F.Bobba, / N.Bode, / M.Boer, / Y.Boetzel, / G.Bogaert, / F.Bondu, / E.Bonilla, / R.Bonnand, / P.Booker, / B.A.Boom, / R.Bork, / V.Boschi, / S.Bose, / V.Bossilkov, / J.Bosveld, / Y.Bouffanais, / A.Bozzi, / C.Bradaschia, / P.R.Brady, / A.Bramley, / M.Branchesi, / J.E.Brau, / M.Breschi, / T.Briant, / J.H.Briggs, / F.Brighenti, / A.Brillet, / M.Brinkmann, / P.Brockill, / A.F.Brooks, / J.Brooks, / D.D.Brown, / S.Brunett, / G.Bruno, / R.Bruntz, / A.Buikema, / T.Bulik, / H.J.Bulten, / A.Buonanno, / D.Buskulic, / R.L.Byer, / M.Cabero, / L.Cadonati, / G.Cagnoli, / C.Cahillane, / Bustillo, J.Calder'on / J.D.Callaghan, / T.A.Callister, / E.Calloni, / J.B.Camp, / M.Canepa, / Santoro, G.Caneva / K.C.Cannon, / H.Cao, / J.Cao, / G.Carapella, / F.Carbognani, / S.Caride, / M.F.Carney, / G.Carullo, / T.L.Carver, / Diaz, J.Casanueva / C.Casentini, / J.Castaneda, / S.Caudill, / M.Cavaglia, / F.Cavalier, / R.Cavalieri, / G.Cella, / P.Cerd'a-Dur'an, / E.Cesarini, / O.Chaibi, / K.Chakravarti, / C.Chan, / M.Chan, / S.Chao, / P.Charlton, / E.A.Chase, / E.Chassande-Mottin, / D.Chatterjee, / M.Chaturvedi, / H.Y.Chen, / X.Chen, / Y.Chen, / H.-P.Cheng, / C.K.Cheong, / H.Y.Chia, / F.Chiadini, / R.Chierici, / A.Chincarini, / A.Chiummo, / G.Cho, / H.S.Cho, / M.Cho, / N.Christensen, / Q.Chu, / S.Chua, / K.W.Chung, / S.Chung, / G.Ciani, / P.Ciecielag, / M.Cie'slar, / A.A.Ciobanu, / R.Ciolfi, / F.Cipriano, / A.Cirone, / F.Clara, / J.A.Clark, / P.Clearwater, / S.Clesse, / F.Cleva, / E.Coccia, / P.-F.Cohadon, / D.Cohen, / M.Colleoni, / C.G.Collette, / C.Collins, / M.Colpi, / M.Constancio, / L.Conti, / S.J.Cooper, / P.Corban, / T.R.Corbitt, / I.Cordero-Carri'on, / S.Corezzi, / K.R.Corley, / N.Cornish, / D.Corre, / A.Corsi, / S.Cortese, / C.A.Costa, / R.Cotesta, / M.W.Coughlin, / S.B.Coughlin, / J.-P.Coulon, / S.T.Countryman, / P.Couvares, / P.B.Covas, / D.M.Coward, / M.J.Cowart, / D.C.Coyne, / R.Coyne, / J.D.E.Creighton, / T.D.Creighton, / J.Cripe, / M.Croquette, / S.G.Crowder, / J.-R.Cudell, / T.J.Cullen, / A.Cumming, / R.Cummings, / L.Cunningham, / E.Cuoco, / M.Curylo, / Canton, T.Dal / G.D'alya, / A.Dana, / L.M.Daneshgaran-Bajastani, / B.D'Angelo, / S.L.Danilishin, / S.D'Antonio, / K.Danzmann, / C.Darsow-Fromm, / A.Dasgupta, / L.E.H.Datrier, / V.Dattilo, / I.Dave, / M.Davier, / G.S.Davies, / D.Davis, / E.J.Daw, / D.DeBra, / M.Deenadayalan, / J.Degallaix, / Laurentis, M.De / S.Del'eglise, / M.Delfavero, / Lillo, N.De / Pozzo, W.Del / L.M.DeMarchi, / V.D'Emilio, / N.Demos, / T.Dent, / Pietri, R.De / Rosa, R.De / Rossi, C.De / R.DeSalvo, / Varona, O.de / S.Dhurandhar, / M.C.D'iaz, / M.Diaz-Ortiz, / T.Dietrich, / Fiore, L.Di / Fronzo, C.Di / Giorgio, C.Di / Giovanni, F.Di / Giovanni, M.Di / Girolamo, T.Di / Lieto, A.Di / B.Ding, / Pace, S.Di / Palma, I.Di / Renzo, F.Di / A.K.Divakarla, / A.Dmitriev, / Z.Doctor, / F.Donovan, / K.L.Dooley, / S.Doravari, / I.Dorrington, / T.P.Downes, / M.Drago, / J.C.Driggers, / Z.Du, / J.-G.Ducoin, / P.Dupej, / O.Durante, / D.D'Urso, / S.E.Dwyer, / P.J.Easter, / G.Eddolls, / B.Edelman, / T.B.Edo, / O.Edy, / A.Effler, / P.Ehrens, / J.Eichholz, / S.S.Eikenberry, / M.Eisenmann, / R.A.Eisenstein, / A.Ejlli, / L.Errico, / R.C.Essick, / H.Estelles, / D.Estevez, / Z.B.Etienne, / T.Etzel, / M.Evans, / T.M.Evans, / B.E.Ewing, / V.Fafone, / S.Fairhurst, / X.Fan, / S.Farinon, / B.Farr, / W.M.Farr, / E.J.Fauchon-Jones, / M.Favata, / M.Fays, / M.Fazio, / J.Feicht, / M.M.Fejer, / F.Feng, / E.Fenyvesi, / D.L.Ferguson, / A.Fernandez-Galiana, / I.Ferrante, / E.C.Ferreira, / T.A.Ferreira, / F.Fidecaro, / I.Fiori, / D.Fiorucci, / M.Fishbach, / R.P.Fisher, / R.Fittipaldi, / M.Fitz-Axen, / V.Fiumara, / R.Flaminio, / E.Floden, / E.Flynn, / H.Fong, / J.A.Font, / P.W.F.Forsyth, / J.-D.Fournier, / S.Frasca, / F.Frasconi, / Z.Frei, / A.Freise, / R.Frey, / V.Frey, / P.Fritschel, / V.V.Frolov, / G.Fronze, / P.Fulda, / M.Fyffe, / H.A.Gabbard, / B.U.Gadre, / S.M.Gaebel, / J.R.Gair, / S.Galaudage, / D.Ganapathy, / S.G.Gaonkar, / C.Garc'ia-Quir'os, / F.Garufi, / B.Gateley, / S.Gaudio, / V.Gayathri, / G.Gemme, / E.Genin, / A.Gennai, / D.George, / J.George, / L.Gergely, / S.Ghonge, / Ghosh, Abhirup / Ghosh, Archisman / S.Ghosh, / B.Giacomazzo, / J.A.Giaime, / K.D.Giardina, / D.R.Gibson, / C.Gier, / K.Gill, / J.Glanzer, / J.Gniesmer, / P.Godwin, / E.Goetz, / R.Goetz, / N.Gohlke, / B.Goncharov, / G.Gonz'alez, / A.Gopakumar, / S.E.Gossan, / M.Gosselin, / R.Gouaty, / B.Grace, / A.Grado, / M.Granata, / A.Grant, / S.Gras, / P.Grassia, / C.Gray, / R.Gray, / G.Greco, / A.C.Green, / R.Green, / E.M.Gretarsson, / H.L.Griggs, / G.Grignani, / A.Grimaldi, / S.J.Grimm, / H.Grote, / S.Grunewald, / P.Gruning, / G.M.Guidi, / A.R.Guimaraes, / G.Guix'e, / H.K.Gulati, / Y.Guo, / A.Gupta, / Gupta, Anchal / P.Gupta, / E.K.Gustafson, / R.Gustafson, / L.Haegel, / O.Halim, / E.D.Hall, / E.Z.Hamilton, / G.Hammond, / M.Haney, / M.M.Hanke, / J.Hanks, / C.Hanna, / M.D.Hannam, / O.A.Hannuksela, / T.J.Hansen, / J.Hanson, / T.Harder, / T.Hardwick, / K.Haris, / J.Harms, / G.M.Harry, / I.W.Harry, / R.K.Hasskew, / C.-J.Haster, / K.Haughian, / F.J.Hayes, / J.Healy, / A.Heidmann, / M.C.Heintze, / J.Heinze, / H.Heitmann, / F.Hellman, / P.Hello, / G.Hemming, / M.Hendry, / I.S.Heng, / E.Hennes, / J.Hennig, / M.Heurs, / S.Hild, / T.Hinderer, / S.Y.Hoback, / S.Hochheim, / E.Hofgard, / D.Hofman, / A.M.Holgado, / N.A.Holland, / K.Holt, / D.E.Holz, / P.Hopkins, / C.Horst, / J.Hough, / E.J.Howell, / C.G.Hoy, / Y.Huang, / M.T.Hubner, / E.A.Huerta, / D.Huet, / B.Hughey, / V.Hui, / S.Husa, / S.H.Huttner, / R.Huxford, / T.Huynh-Dinh, / B.Idzkowski, / A.Iess, / H.Inchauspe, / C.Ingram, / G.Intini, / J.-M.Isac, / M.Isi, / B.R.Iyer, / T.Jacqmin, / S.J.Jadhav, / S.P.Jadhav, / A.L.James, / K.Jani, / N.N.Janthalur, / P.Jaranowski, / D.Jariwala, / R.Jaume, / A.C.Jenkins, / J.Jiang, / G.R.Johns, / A.W.Jones, / D.I.Jones, / J.D.Jones, / P.Jones, / R.Jones, / R.J.G.Jonker, / L.Ju, / J.Junker, / C.V.Kalaghatgi, / V.Kalogera, / B.Kamai, / S.Kandhasamy, / G.Kang, / J.B.Kanner, / S.J.Kapadia, / S.Karki, / R.Kashyap, / M.Kasprzack, / W.Kastaun, / S.Katsanevas, / E.Katsavounidis, / W.Katzman, / S.Kaufer, / K.Kawabe, / F.K'ef'elian, / D.Keitel, / A.Keivani, / R.Kennedy, / J.S.Key, / S.Khadka, / F.Y.Khalili, / I.Khan, / S.Khan, / Z.A.Khan, / E.A.Khazanov, / N.Khetan, / M.Khursheed, / N.Kijbunchoo, / Kim, Chunglee / G.J.Kim, / J.C.Kim, / K.Kim, / W.Kim, / W.S.Kim, / Y.-M.Kim, / C.Kimball, / P.J.King, / M.Kinley-Hanlon, / R.Kirchhoff, / J.S.Kissel, / L.Kleybolte, / S.Klimenko, / T.D.Knowles, / E.Knyazev, / P.Koch, / S.M.Koehlenbeck, / G.Koekoek, / S.Koley, / V.Kondrashov, / A.Kontos, / N.Koper, / M.Korobko, / W.Z.Korth, / M.Kovalam, / D.B.Kozak, / V.Kringel, / N.V.Krishnendu, / A.Kr'olak, / N.Krupinski, / G.Kuehn, / A.Kumar, / P.Kumar, / Kumar, Rahul / Kumar, Rakesh / S.Kumar, / L.Kuo, / A.Kutynia, / B.D.Lackey, / D.Laghi, / E.Lalande, / T.L.Lam, / A.Lamberts, / M.Landry, / B.B.Lane, / R.N.Lang, / J.Lange, / B.Lantz, / R.K.Lanza, / Rosa, I.La / A.Lartaux-Vollard, / P.D.Lasky, / M.Laxen, / A.Lazzarini, / C.Lazzaro, / P.Leaci, / S.Leavey, / Y.K.Lecoeuche, / C.H.Lee, / H.M.Lee, / H.W.Lee, / J.Lee, / K.Lee, / J.Lehmann, / N.Leroy, / N.Letendre, / Y.Levin, / A.K.Y.Li, / J.Li, / K.li, / T.G.F.Li, / X.Li, / F.Linde, / S.D.Linker, / J.N.Linley, / T.B.Littenberg, / J.Liu, / X.Liu, / M.Llorens-Monteagudo, / R.K.L.Lo, / A.Lockwood, / L.T.London, / A.Longo, / M.Lorenzini, / V.Loriette, / M.Lormand, / G.Losurdo, / J.D.Lough, / C.O.Lousto, / G.Lovelace, / H.Luck, / D.Lumaca, / A.P.Lundgren, / Y.Ma, / R.Macas, / S.Macfoy, / M.MacInnis, / D.M.Macleod, / I.A.O.MacMillan, / A.Macquet, / Hernandez, I.Magana / F.Magana-Sandoval, / R.M.Magee, / E.Majorana, / I.Maksimovic, / A.Malik, / N.Man, / V.Mandic, / V.Mangano, / G.L.Mansell, / M.Manske, / M.Mantovani, / M.Mapelli, / F.Marchesoni, / F.Marion, / S.M'arka, / Z.M'arka, / C.Markakis, / A.S.Markosyan, / A.Markowitz, / E.Maros, / A.Marquina, / S.Marsat, / F.Martelli, / I.W.Martin, / R.M.Martin, / V.Martinez, / D.V.Martynov, / H.Masalehdan, / K.Mason, / E.Massera, / A.Masserot, / T.J.Massinger, / M.Masso-Reid, / S.Mastrogiovanni, / A.Matas, / F.Matichard, / N.Mavalvala, / E.Maynard, / J.J.McCann, / R.McCarthy, / D.E.McClelland, / S.McCormick, / L.McCuller, / S.C.McGuire, / C.McIsaac, / J.McIver, / D.J.McManus, / T.McRae, / S.T.McWilliams, / D.Meacher, / G.D.Meadors, / M.Mehmet, / A.K.Mehta, / Villa, E.Mejuto / A.Melatos, / G.Mendell, / R.A.Mercer, / L.Mereni, / K.Merfeld, / E.L.Merilh, / J.D.Merritt, / M.Merzougui, / S.Meshkov, / C.Messenger, / C.Messick, / R.Metzdorff, / P.M.Meyers, / F.Meylahn, / A.Mhaske, / A.Miani, / H.Miao, / I.Michaloliakos, / C.Michel, / H.Middleton, / 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    Abstract: We search for gravitational-wave transients associated with gamma-ray bursts detected by the Fermi and Swift satellites during the first part of the third observing run of Advanced LIGO and Advanced Virgo (1 April 2019 15:00 UTC - 1 October 2019 15:00 ... ...

    Abstract We search for gravitational-wave transients associated with gamma-ray bursts detected by the Fermi and Swift satellites during the first part of the third observing run of Advanced LIGO and Advanced Virgo (1 April 2019 15:00 UTC - 1 October 2019 15:00 UTC). 105 gamma-ray bursts were analyzed using a search for generic gravitational-wave transients; 32 gamma-ray bursts were analyzed with a search that specifically targets neutron star binary mergers as short gamma-ray burst progenitors. We describe a method to calculate the probability that triggers from the binary merger targeted search are astrophysical and apply that method to the most significant gamma-ray bursts in that search. We find no significant evidence for gravitational-wave signals associated with the gamma-ray bursts that we followed up, nor for a population of unidentified subthreshold signals. We consider several source types and signal morphologies, and report for these lower bounds on the distance to each gamma-ray burst.
    Keywords covid19
    Publisher ArXiv
    Document type Article
    Database COVID19

    Kategorien

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