103,291 research outputs found
Boxer - a Fortran program to compute source parameters of earthquakes from macroseismic data
No full textBoxer program is a revised and simplified version of several computer codes which have been written in the last 10 years to compute focal parameters of earthquakes from macroseismic data and have also been actually used to compute synthetic earthquake parameters for the “Catalogo dei Forti Terremoti in Italia dal 461 a.C. al 1990” [Boschi et al. 1995, 1997], the Catalogo Parametrico dei terremoti Italiani (CPTI) [CPTI Working Group, 1999] and to make the computation of the paper by Gasperini et al. [1999].
Release 3.3 implements an improved method to compute magnitude using a weighting scheme also including the reliability of empirical regressions for each intensity class as well as a procedure to compute coefficients of magnitude intensity relations. This new method has been actually adopted for revaluing the magnitudes of the historical seismic catalog [CPTI Working Group, 2004] used by the recent INGV initiative for the computation of the new seismic hazard map of Italy [Seismic-Hazard Map Working Group, 2004]. In this version are also included a previously undocumented option allowing to write import files for the MapInfo Graphic Information System (GIS) and a new option generating input files to plot epicenters and boxes by the General Mapping Tool [Wessel and Smith, 1991]. Other minor changes concerned the formats of input-output files.
A description of the procedure to compute the azimuth and to draw the “boxes” representing the seismogenic structures can be found in Gasperini et al. [1999]. More details on the computation of epicenter and magnitude are reported by Gasperini and Ferrari [1995, 1997, 2000].
Acknowledgements
The program took advantage of the contribution of Filippo Bernardini, Graziano Ferrari and Gianluca Valensise (who also suggested the name) and by important improvements made by Gianfranco Vannucci (particularly regarding the code to generate MapInfo and GMT files).
References
Boschi, E., G. Ferrari, P. Gasperini, E. Guidoboni, G. Smriglio and G. Valensise (1995). Catalogo dei forti terremoti in Italia dal 461 a.C. al 1980, ING-SGA, Bologna, 973 pp. and a CD-ROM.
Boschi, E., E. Guidoboni, G. Ferrari, G. Valensise and P. Gasperini (1997). Catalogo dei forti terremoti in Italia dal 461 a.C. al 1990, ING-SGA, Bologna, 644 pp. and a CD-ROM.
Gasperini, P., and G. Ferrari (1995). Stima dei parametri sintetici, in: E. Boschi et al. (Eds.),Catalogo dei Forti Terremoti in Italia dal 461 a.C. al 1980, ING-SGA publ., 96-111.
Gasperini, P., and G. Ferrari (1997). Stima dei parametri sintetici: nuove elaborazioni, in: E. Boschiet al. (Eds.), Catalogo dei Forti Terremoti in Italia dal 461 a.C. al 1990, ING- SGA publ., 56-64.
Gasperini, P., and G. Ferrari (2000). Deriving numerical estimates from descriptive information:thecomputation of earthquake parameters. Annali di Geofisica, 43, 729-746.
Gasperini P., Bernardini F., Valensise G. and Boschi E. (1999). Defining Seismogenic Sourcesfrom Historical Earthquake Felt Reports, Bull. Seism. Soc. Am., 89, 94-110.
CPTI Working Group (1999), Catalogo Parametrico dei Terremoti Italiani. (Boschi et al. Eds.), Editrice Compositori, Bologna, Italy, pp.88, (available at http://emidius.mi.ingv.it/CPTI/)
CPTI Working Group (2004), Catalogo Parametrico dei Terremoti Italiani, versione 2004 (CPTI04). (Gasperini P., Camassi R., Mirto C. and Stucchi M. Eds.) INGV, Bologna, Italy, http://emidius.mi.ingv.it/CPTI/
Seismic-Hazard Map Working Group (Stucchi M., Akinci A., Faccioli E., Gasperini P.,Malagnini L., Meletti C., Montaldo V. e Valensise G.), (2004) Redazione della mappa dipericolosità sismica prevista dell’ordinanza PCM del 20 marzo 2003, n 3274, All. 1, INGV, Milano. disponibile a: http://zonesismiche.mi.ingv.it/documenti/rapporto_conclusivo.pdf
Wessel P. and W.H.F Smith (1991). Free software helps map and display data, EOS Trans. Am.Geophys. Un., 72, 44
Earthquake Mechanisms of the Mediterranean Area (EMMA) version 3: an improved tool for characterizing the tectonic deformation styles in the Mediterranean
No full textGeophysical Research Abstracts,
Vol. 11, EGU2009-7974, 2009
EGU General Assembly 2009
© Author(s) 2009
Earthquake Mechanisms of the Mediterranean Area (EMMA) version 3:
an improved tool for characterizing the tectonic deformation styles in the
Mediterranean.
G. Vannucci (1), P. Imprescia (2), and P. Gasperini (3)
(1) INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), [email protected],
(2) Dipartimento Scienze Geologiche, Università di Catania, Corso Italia, 57, I-95129 Catania (Italy), [email protected],
(3) Dipartimento di Fisica, Università di Bologna, Viale Berti-Pichat 8, I-40127 Bologna (Italy), [email protected]
EMMA (Earthquake Mechanisms of the Mediterranean Area) database contains available literature data with the
goal of making them more usable and available. EMMA is continuously improving by the addition of further
focal mechanisms found in literature. At the present time, EMMA pre-release 3 includes more than 12700 focal
solutions, about twice of previous official release 2.2 (Vannucci and Gasperini, 2004). They cover a time window
from 1905 to 2006. In the new release, many added solutions are in areas not much covered or completely
uncovered in the previous one (e.g. Bulgaria, Germany, Anatolia).
As in the previous versions (Vannucci and Gasperini, 2003 and 2004), we have uniformed the different formats
and notations of the data available from different sources and we have tried to solve misprints, inaccuracies and
inconsistencies that might make the data unusable for other investigations. By an automatic procedure based on
several criteria, we have chosen the “most representative” (best) solution when more than one is available for
the same earthquake. Thanks to this, we have obtained about 6000 best solutions. The end user can use the best
solution obtained with our procedure or he can change criteria.
The database allows to make selections and to export data files suitable to be handled by graphic software and
user generated scripts. In the new version, still MS-ACCESS based, we have added geographic information to
the display of the focal solution, as well as we have integrated the hypocentral and magnitude data found on the
original papers with those reported by regional and local catalogs and bulletins.
In order to make EMMA more accessible, a web version is currently in progress. Through an internet connection
it will be possible data selection and export, without installation and configuration problems found in the past.
EMMA was already used in the past and will be (hopefully) useful in the future to better characterize the tectonic
deformation styles (e.g. by moment tensors sum within given areas or over regular geographical grids) particularly
in areas of the European region where seismicity is moderate and only few CMT solutions are available.
At the moment, we try to compute strain map for Mediterranean area, using EMMA data. In order to represent
any recurrence in space, we identify small areas and apply to each one some spatial analyses. The work is still in
progress, but preliminary results are satisfactory and in accord to previous studies.PublishedWien5.2. TTC - Banche dati di sismologia strumentaleope
Earthquake Mechanisms of the Mediterranean Area (EMMA) version 3: an improved tool for characterizing the tectonic deformation styles in the Mediterranean
No full textGeophysical Research Abstracts,
Vol. 11, EGU2009-7974, 2009
EGU General Assembly 2009
© Author(s) 2009
Earthquake Mechanisms of the Mediterranean Area (EMMA) version 3:
an improved tool for characterizing the tectonic deformation styles in the
Mediterranean.
G. Vannucci (1), P. Imprescia (2), and P. Gasperini (3)
(1) INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), [email protected],
(2) Dipartimento Scienze Geologiche, Università di Catania, Corso Italia, 57, I-95129 Catania (Italy), [email protected],
(3) Dipartimento di Fisica, Università di Bologna, Viale Berti-Pichat 8, I-40127 Bologna (Italy), [email protected]
EMMA (Earthquake Mechanisms of the Mediterranean Area) database contains available literature data with the
goal of making them more usable and available. EMMA is continuously improving by the addition of further
focal mechanisms found in literature. At the present time, EMMA pre-release 3 includes more than 12700 focal
solutions, about twice of previous official release 2.2 (Vannucci and Gasperini, 2004). They cover a time window
from 1905 to 2006. In the new release, many added solutions are in areas not much covered or completely
uncovered in the previous one (e.g. Bulgaria, Germany, Anatolia).
As in the previous versions (Vannucci and Gasperini, 2003 and 2004), we have uniformed the different formats
and notations of the data available from different sources and we have tried to solve misprints, inaccuracies and
inconsistencies that might make the data unusable for other investigations. By an automatic procedure based on
several criteria, we have chosen the “most representative” (best) solution when more than one is available for
the same earthquake. Thanks to this, we have obtained about 6000 best solutions. The end user can use the best
solution obtained with our procedure or he can change criteria.
The database allows to make selections and to export data files suitable to be handled by graphic software and
user generated scripts. In the new version, still MS-ACCESS based, we have added geographic information to
the display of the focal solution, as well as we have integrated the hypocentral and magnitude data found on the
original papers with those reported by regional and local catalogs and bulletins.
In order to make EMMA more accessible, a web version is currently in progress. Through an internet connection
it will be possible data selection and export, without installation and configuration problems found in the past.
EMMA was already used in the past and will be (hopefully) useful in the future to better characterize the tectonic
deformation styles (e.g. by moment tensors sum within given areas or over regular geographical grids) particularly
in areas of the European region where seismicity is moderate and only few CMT solutions are available.
At the moment, we try to compute strain map for Mediterranean area, using EMMA data. In order to represent
any recurrence in space, we identify small areas and apply to each one some spatial analyses. The work is still in
progress, but preliminary results are satisfactory and in accord to previous studies.PublishedWien5.2. TTC - Banche dati di sismologia strumentaleope
Time and space clustering of Etna volcano earthquakes during the period May 1983-February 1987
No full textParticularly well located earthquakes exist at Etna volcano for the period May 1983-February 1987, since an 18-stations seismic network was in operation. The space-time clustering of the seismic activity is analyzed statistically in this period by using the model of Gasperini and Mulargia (1989), which is based on the influence region. The following clustering features are identified: (1) clustering is mainly originated by swarm-type sequences; (2) two magnitude-dependent best fits are obtained by an influence region of respectively 1.5 to 6 days and 15 to 20 km; (3) no evident space and time relation between clusters and eruptions is apparent. © 1992
Gravity at Finite Temperature, Equivalence Principle, and Local Lorentz Invariance
No full textIn this Chapter we illustrate the close connection between the violation of
the weak equivalence principle typical of gravitational interactions at finite
temperature, and similar violations induced by a breaking of the local Lorentz
symmetry. We also discuss the physical implications of the effective repulsive
forces possibly arising in such a generalized gravitational context, by
considering, for an illustrative purpose, a quasi-Riemannian model of gravity
with rotational symmetry as the local gauge group in tangent space
Late-time effects of Planck scale cosmology: dilatonic interpretation of the dark energy field
No full text
A new version of "Boxer" code for the determination of seismic source parameters from macroseismic data
No full textGeophysical Research Abstracts,
Vol. 11, EGU2009-5699, 2009
EGU General Assembly 2009
© Author(s) 2009
A new version of "Boxer" code for the determination of seismic source
parameters from macroseismic data.
P. Gasperini (1), G. Vannucci (2), and D. Tripone (3)
(1) Dipartimento di Fisica, Università di Bologna, Viale Berti-Pichat 8, I-40127 Bologna (Italy), [email protected], (2)
INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), ([email protected]),
(3) INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), ([email protected])
About ten years after the first release of the code we implemented new methods of epicentral location and magnitude
computation as well as a procedure for the evaluation of uncertainties by the bootstrap technique. We also
developed a user-friendly interface for parameter setup and graphical post-processing of the results. The improved
code allows to locating epicenters in the sea or in uninhabited areas by minimizing the norm of the residuals of an
attenuation equation. The same approach also per-mits, in the most favorable cases, the estimation of the source
depth. By the geographical rendering of the bootstrap solutions we give a tool for characterizing the possible
multiplicity of the seismic source of historical earthquakes.UnpublishedWien5.1. TTC - Banche dati e metodi macrosismiciope
A new version of "Boxer" code for the determination of seismic source parameters from macroseismic data
No full textGeophysical Research Abstracts,
Vol. 11, EGU2009-5699, 2009
EGU General Assembly 2009
© Author(s) 2009
A new version of "Boxer" code for the determination of seismic source
parameters from macroseismic data.
P. Gasperini (1), G. Vannucci (2), and D. Tripone (3)
(1) Dipartimento di Fisica, Università di Bologna, Viale Berti-Pichat 8, I-40127 Bologna (Italy), [email protected], (2)
INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), ([email protected]),
(3) INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), ([email protected])
About ten years after the first release of the code we implemented new methods of epicentral location and magnitude
computation as well as a procedure for the evaluation of uncertainties by the bootstrap technique. We also
developed a user-friendly interface for parameter setup and graphical post-processing of the results. The improved
code allows to locating epicenters in the sea or in uninhabited areas by minimizing the norm of the residuals of an
attenuation equation. The same approach also per-mits, in the most favorable cases, the estimation of the source
depth. By the geographical rendering of the bootstrap solutions we give a tool for characterizing the possible
multiplicity of the seismic source of historical earthquakes.UnpublishedWien5.1. TTC - Banche dati e metodi macrosismiciope
Singularity and exit problems in two-dimensional string cosmology
No full textA broad class of two-dimensional loop-corrected dilaton gravity models exhibit cosmological solutions that interpolate between the string perturbative vacuum and a background with asymptotically flat metric and linearly growing dilaton. The curvature singularities of the corresponding tree-level solutions are smoothed out, but no branch-change occurs. Thus, even in the presence of a non-perturbative potential, the system is not attracted by physically interesting fixed points with constant dilaton, and the exit problem of string cosmology persists.A broad class of two-dimensional loop-corrected dilaton gravity models exhibit cosmological solutions that interpolate between the string perturbative vacuum and a background with asymptotically flat metric and linearly growing dilaton. The curvature singularities of the corresponding tree-level solutions are smoothed out, but no branch-change occurs. Thus, even in the presence of a non-perturbative potential, the system is not attracted by physically interesting fixed points with constant dilaton, and the exit problem of string cosmology persists
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