Late wave arrivals in the intermediate period coda of regional seismograms in the wider Alpine ar... more Late wave arrivals in the intermediate period coda of regional seismograms in the wider Alpine area can be associated with lateral reflection of surface waves at the northern Apennines mountain chain (Italy). Frequently, these coda waveforms are dominated by a ...
The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE ... more The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE convergence between Africa and Eurasia at a rate of 5 mm/yr. Coeval extension in the Alboran Basin and a N35°E trending band of active, left-lateral shear deformation in ...
Seismograms are the most comprehensive and quantitative documents of ground motion produced by ea... more Seismograms are the most comprehensive and quantitative documents of ground motion produced by earthquakes. First preserved records account for more than 100 years of instrumental seismology already, outperforming the time-span covered by modern broad-band seismic networks. But their uniqueness, as a document, prior to the generalization of massive methods of copy and distribution, limits the usability and availability of the earliest seismograms for research purposes. Contemporaneous analysis of old seismograms predated fundamental developments in quantitative seismology, as well as the digital revolution, suggesting the reanalysis of these unique and valuable records with modern seismological tools for the direct calculation of earthquake source parameters, at least for the most relevant events. However, this is not straightforward: Early seismograms have been recorded at instruments with low dynamic range and narrow frequency band. Many times the complementary information required to process the records and to recover ground displacement, like instrument calibration and time accuracy, has been lost or is doubtful. In fact, procedures to make old seismograms useful for quantitative analysis are, in many aspects, similar to those needed to process and to use old macroseismic information. The present contribution reviews the main topics and methodologies leading to a proper use of old seismograms and related documents, including the location and distribution of the original seismograms and recording system information, as well as the sequence from the original paper seismogram to digital ground displacement, involving digitization, trace correction and deconvolution of the instrument response. We discuss the potential and the limitations of such treatments, and review some applications of recovered records in retrieving earthquake source parameters through full waveform analysis.
... García-Dueñas, V., Balanyá, JC and Martínez-Martínez, JM, 1992. Miocene extensional detachmen... more ... García-Dueñas, V., Balanyá, JC and Martínez-Martínez, JM, 1992. Miocene extensional detachments in the outcropping basement of the Northern Alboran Basin (Betics) and their tectonic implications. Geo-Mar. Lett., 12, 88–95. ...
... Fig. 1. Distribution of permanent (filled triangles, operated by IGN, IAG, IGC, IM/FCUL, Geof... more ... Fig. 1. Distribution of permanent (filled triangles, operated by IGN, IAG, IGC, IM/FCUL, Geofon/ROA/UCM, IST, MedNet, IRIS or Observatori de l'Ebre) and temporary (open triangles, operated by the TopoIberia team or by IAG) seismic broadband stations in the IberiaMaghreb ...
The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE ... more The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE convergence between Africa and Eurasia at a rate of 5 mm/yr. Coeval extension in the Alboran Basin and a N35°E trending band of active, left-lateral shear deformation in ...
... The macroseismic map was drawn by Rodriguez Navarro and is published in its original form in ... more ... The macroseismic map was drawn by Rodriguez Navarro and is published in its original form in Galbis (1940) and in an abridged form in Mezcua ... Nodal planes have orientations of 123°/39°/-86° (strike/dip/rake) and 298°/51°/-93°, with a near vertical P axis at 188°/83° (strike ...
Physics of the Earth and Planetary Interiors, 2008
On 29 January 2005, a MW 4.8, Imax VI–VII, earthquake occurred near the village of La Paca, SE Sp... more On 29 January 2005, a MW 4.8, Imax VI–VII, earthquake occurred near the village of La Paca, SE Spain. The aftershock sequence shows distinct heterogeneity, manifested in a non-uniform temporal decay of activity and different source mechanisms for the main shock and the largest aftershocks. We analysed 262 earthquakes of the seismic series in order to characterize the active seismic
[18] Small to moderate tectonic earthquakes are usually thought as simple shear failure events co... more [18] Small to moderate tectonic earthquakes are usually thought as simple shear failure events corresponding to double-couple force systems. Most of the computed moment tensors have small non double couple components (< 20% for 42 and< 30% for 53 out of ...
A part of the deep seismic near normal-incidence Münchberg–Vogtland–Erzgebirge (MVE) observations... more A part of the deep seismic near normal-incidence Münchberg–Vogtland–Erzgebirge (MVE) observations located in the Saxo-Thuringian Belt at the northern rim of the Bohemian Massif has been reprocessed using the method of amplitude preserving 3D prestack depth migration. The advantage of this method is its ability to deliver a quantitative and geometrically correct image of the crustal reflectivity without preference of
Time reversal of seismic wavefields recorded at active volcanoes may provide images of the source... more Time reversal of seismic wavefields recorded at active volcanoes may provide images of the source process for long-period (LP) or volcanic tremor events directly, independent of assumptions about extent, geometry and mechanics of the source. Time reversal methods involve propagating the original time series from many receiver locations back into the medium. The reversed signals then focus at their origin
Late wave arrivals in the intermediate period coda of regional seismograms in the wider Alpine ar... more Late wave arrivals in the intermediate period coda of regional seismograms in the wider Alpine area can be associated with lateral reflection of surface waves at the northern Apennines mountain chain (Italy). Frequently, these coda waveforms are dominated by a ...
The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE ... more The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE convergence between Africa and Eurasia at a rate of 5 mm/yr. Coeval extension in the Alboran Basin and a N35°E trending band of active, left-lateral shear deformation in ...
Seismograms are the most comprehensive and quantitative documents of ground motion produced by ea... more Seismograms are the most comprehensive and quantitative documents of ground motion produced by earthquakes. First preserved records account for more than 100 years of instrumental seismology already, outperforming the time-span covered by modern broad-band seismic networks. But their uniqueness, as a document, prior to the generalization of massive methods of copy and distribution, limits the usability and availability of the earliest seismograms for research purposes. Contemporaneous analysis of old seismograms predated fundamental developments in quantitative seismology, as well as the digital revolution, suggesting the reanalysis of these unique and valuable records with modern seismological tools for the direct calculation of earthquake source parameters, at least for the most relevant events. However, this is not straightforward: Early seismograms have been recorded at instruments with low dynamic range and narrow frequency band. Many times the complementary information required to process the records and to recover ground displacement, like instrument calibration and time accuracy, has been lost or is doubtful. In fact, procedures to make old seismograms useful for quantitative analysis are, in many aspects, similar to those needed to process and to use old macroseismic information. The present contribution reviews the main topics and methodologies leading to a proper use of old seismograms and related documents, including the location and distribution of the original seismograms and recording system information, as well as the sequence from the original paper seismogram to digital ground displacement, involving digitization, trace correction and deconvolution of the instrument response. We discuss the potential and the limitations of such treatments, and review some applications of recovered records in retrieving earthquake source parameters through full waveform analysis.
... García-Dueñas, V., Balanyá, JC and Martínez-Martínez, JM, 1992. Miocene extensional detachmen... more ... García-Dueñas, V., Balanyá, JC and Martínez-Martínez, JM, 1992. Miocene extensional detachments in the outcropping basement of the Northern Alboran Basin (Betics) and their tectonic implications. Geo-Mar. Lett., 12, 88–95. ...
... Fig. 1. Distribution of permanent (filled triangles, operated by IGN, IAG, IGC, IM/FCUL, Geof... more ... Fig. 1. Distribution of permanent (filled triangles, operated by IGN, IAG, IGC, IM/FCUL, Geofon/ROA/UCM, IST, MedNet, IRIS or Observatori de l'Ebre) and temporary (open triangles, operated by the TopoIberia team or by IAG) seismic broadband stations in the IberiaMaghreb ...
The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE ... more The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, NWSE convergence between Africa and Eurasia at a rate of 5 mm/yr. Coeval extension in the Alboran Basin and a N35°E trending band of active, left-lateral shear deformation in ...
... The macroseismic map was drawn by Rodriguez Navarro and is published in its original form in ... more ... The macroseismic map was drawn by Rodriguez Navarro and is published in its original form in Galbis (1940) and in an abridged form in Mezcua ... Nodal planes have orientations of 123°/39°/-86° (strike/dip/rake) and 298°/51°/-93°, with a near vertical P axis at 188°/83° (strike ...
Physics of the Earth and Planetary Interiors, 2008
On 29 January 2005, a MW 4.8, Imax VI–VII, earthquake occurred near the village of La Paca, SE Sp... more On 29 January 2005, a MW 4.8, Imax VI–VII, earthquake occurred near the village of La Paca, SE Spain. The aftershock sequence shows distinct heterogeneity, manifested in a non-uniform temporal decay of activity and different source mechanisms for the main shock and the largest aftershocks. We analysed 262 earthquakes of the seismic series in order to characterize the active seismic
[18] Small to moderate tectonic earthquakes are usually thought as simple shear failure events co... more [18] Small to moderate tectonic earthquakes are usually thought as simple shear failure events corresponding to double-couple force systems. Most of the computed moment tensors have small non double couple components (< 20% for 42 and< 30% for 53 out of ...
A part of the deep seismic near normal-incidence Münchberg–Vogtland–Erzgebirge (MVE) observations... more A part of the deep seismic near normal-incidence Münchberg–Vogtland–Erzgebirge (MVE) observations located in the Saxo-Thuringian Belt at the northern rim of the Bohemian Massif has been reprocessed using the method of amplitude preserving 3D prestack depth migration. The advantage of this method is its ability to deliver a quantitative and geometrically correct image of the crustal reflectivity without preference of
Time reversal of seismic wavefields recorded at active volcanoes may provide images of the source... more Time reversal of seismic wavefields recorded at active volcanoes may provide images of the source process for long-period (LP) or volcanic tremor events directly, independent of assumptions about extent, geometry and mechanics of the source. Time reversal methods involve propagating the original time series from many receiver locations back into the medium. The reversed signals then focus at their origin
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