A new continuous GPS network was installed under the umbrella of a research project called ''Geoc... more A new continuous GPS network was installed under the umbrella of a research project called ''Geociencias en Iberia: Estudios integrados de topografía y evolución 4D (Topo-Iberia)'', to improve understanding of kinematic behavior of the Iberian Peninsula region. Here we present a velocity field based on the analysis of the 4 years of data from 25 stations constituting the network, which were analyzed by three different analysis groups contributing to the project. Different geodetic software packages (GIPSY-OASIS, Bernese and GAMIT) as well as different approaches were used to estimate rates of present day crustal deformation in the Iberian Peninsula and Morocco. In order to ensure the consistency of the velocity fields determined by the three groups, the velocities obtained by each analysis center were transformed into a common Eurasia Reference Frame. After that, the strain rate field was calculated. The results put in evidence more prominent residual motions in Morocco and southernmost part of the Iberian Peninsula. In particular, the dilatation and shear strain rates reach their maximum values in the Central Betics and northern Alboran Sea. A small region of high shear strain rate is observed in the east-central part of the peninsula and another deformation focus is located around the Strait of Gibraltar and the Gulf of Cadiz.
Physics and Chemistry of the Earth, Parts A/B/C, 2008
Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level... more Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level from vertical land movements tide gauges are often co-located with Continuous GPS (CGPS). In order to achieve an accuracy of better than 1 mm/yr, as required for sea level studies in the global change context, vertical land motion needs to be determined with the same accuracy. This is an ambitious goal for CGPS and needs a carefully designed analysis strategy. We have compared the independent results from six different analysis centres, using three different GPS processing softwares and a number of different analysis strategies.
We present GPS observations in Morocco and adjacent areas of Spain from 15 continuous (CGPS) and ... more We present GPS observations in Morocco and adjacent areas of Spain from 15 continuous (CGPS) and 31 survey-mode (SGPS) sites extending from the stable part of the Nubian plate to central Spain. We determine a robust velocity field for the W Mediterranean that we use to constrain models for the Iberia-Nubia plate boundary. South of the High Atlas Mountain system, GPS motions are consistent with Nubia plate motions from prior geodetic studies. We constrain shortening in the Atlas system to <1.5 mm/yr, 95% confidence level. North of the Atlas Mountains, the GPS velocities indicate Nubia motion with respect to Eurasia, but also a component of motion normal to the direction of Nubia-Eurasia motion, consisting of southward translation of the Rif Mountains in N Morocco at rates exceeding 5 mm/yr. This southward motion appears to be directly related to Miocene opening of the Alboran Sea. The Betic Mountain system north of the Alboran Sea is characterized by WNW motion with respect to Eurasia at ∼1-2 mm/yr, paralleling Nubia-Eurasia relative motion. In addition, sites located in the Betics north of the southerly moving Rif Mountains also indicate a component of southerly motion with respect to Eurasia. We interpret this as indicating that deformation associated with Nubia-Eurasia plate motion extends into the southern Betics, but also that the Betic system may be affected by the same processes that are causing southward motion of the Rif Mountains south of the Alboran Sea. Kinematic modeling indicates that plate boundary geometries that include a boundary through the Straits of Gibraltar are most compatible with the component of motion in the direction of relative plate motion, but that two additional blocks (Alboran-Rif block, Betic Mountain block), independent of both Nubia and Eurasia are needed to account for the motions of the Rif and Betic Mountains normal to the direction of relative plate motion. We speculate that the southward motions of the Alboran-Rif and Betic blocks may be related to mantle flow, possibly induced by southward rollback of the subducted Nubian plate beneath the Alboran Sea and Rif Mountains. (P. Vernant), [email protected] (A. Fadil), [email protected] (T. Mourabit), [email protected] (D. Ouazar), [email protected] (J.M. Davila), [email protected] (R. Reilinger).
Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level... more Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level from vertical land movements tide gauges are often co-located with Continuous GPS (CGPS). In order to achieve an accuracy of better than 1 mm/yr, as required for sea level studies in the global change context, vertical land motion needs to be determined with the same accuracy. This is an ambitious goal for CGPS and needs a carefully designed analysis strategy. We have compared the independent results from six different analysis centres, using three different GPS processing softwares and a number of different analysis strategies.
In the framework of the European Union SEa Level Fluctuations (SELF) I and the SELF II Projects d... more In the framework of the European Union SEa Level Fluctuations (SELF) I and the SELF II Projects designed to study sea level variations around the Mediterranean and Black Seas, the Global Positioning System (GPS) technique was adopted to measure the ongoing crustal movements at tide gauge stations. Tide gauges measure sea-level variations with respect to a ground benchmark. In order to determine true sea-level variations of a few millimeters per year, it is necessary to estimate the ground vertical movement to a high degree of accuracy. Countries involved in the projects were Spain, France, Italy, Greece, Bulgaria and Russia. In the period from 1993 to 1998 repeated observations at more than 28 tide gauges and at a number of reference and intermediate stations were conducted. GPS measurements were complemented by Water Vapor Radiometers (WVR) at selected sites. Individual campaigns were evaluated and analyzed and showed height variations in the millimetercentimeter range. All data were processed following common standards using the Bernese Software in a unified analysis to generate a combined solution. Based on the normal equations of all of the campaigns, a combined solution for the SELF 0921-8181/02/$ -see front matter D 2002 Elsevier Science B.V. All rights reserved. PII: S 0 9 2 1 -8 1 8 1 ( 0 2 ) 0 0 1 0 3 -0 * Corresponding author. University of the Bundeswehr
Physics and Chemistry of The Earth Part A-solid Earth and Geodesy, 2001
... Calais&amp;amp;amp;amp;amp;amp;amp;#x27;, J. Talaya&amp;amp;amp;amp;amp;amp;amp;#x27;... more ... Calais&amp;amp;amp;amp;amp;amp;amp;#x27;, J. Talaya&amp;amp;amp;amp;amp;amp;amp;#x27;, A. Rius4, R Vesper, R. Santangelo&amp;amp;amp;amp;amp;amp;amp;#x27;, X. Y Huang&amp;amp;amp;amp;amp;amp;amp;#x27;, JM Davila&amp;amp;amp;amp;amp;amp;amp;#x27;, M. Gel, L. Cucurul14, A. Flores&amp;amp;amp;amp;amp;amp;amp;#x27;, C. Sciarrettas ... validating robust GPS integrated water vapor (IWV) and 2) Validation and performance verification of the zenith tropospheric delay (ZTD) data sets and ...
Desde su fundación en el año 1753, el Real Instituto y Observatorio de la Armada (ROA) ha realiza... more Desde su fundación en el año 1753, el Real Instituto y Observatorio de la Armada (ROA) ha realizado diferentes actividades en el campo de la Geofísica, inicialmente en Meteorología, posteriormente ampliadas al Geomagnetismo y Sismología y, de forma más reciente, al seguimiento de satélites artificiales por técnicas láser y GPS. Asimismo, la participación del ROA en campañas geofísicas marinas y terrestres ha sido también muy activa. En el presente trabajo se hace una breve reseña histórica de dichas actividades y se describe, con un poco más de amplitud, su situación actual.
Abstract A local ties survey in the San Fernando Naval Observatory (ROA: Real Observatorio de la ... more Abstract A local ties survey in the San Fernando Naval Observatory (ROA: Real Observatorio de la Armada) was carried out by the Instituto Geografico Nacional de España (IGNE) team during the summer of 2009. A SLR station (SFEL) contributing to the ...
The Eurasian-African plate boundary crosses the called &amp;amp;amp;amp;amp;amp;amp;quot;Iber... more The Eurasian-African plate boundary crosses the called &amp;amp;amp;amp;amp;amp;amp;quot;Ibero-Maghrebian&amp;amp;amp;amp;amp;amp;amp;quot; region from San Vicente Cape (SW Portugal) to Tunisia including the South of Iberia, Alboran Sea, and northern of Morocco and Algeria. The low convergence rate at this plate boundary produces a continuous moderate seismic activity of low magnitude and shallow depth, where the occurrence of large earthquakes is separated by long
Abstract The Iberian Peninsula is one of the natural laboratories proposed in the framework of th... more Abstract The Iberian Peninsula is one of the natural laboratories proposed in the framework of the TopoEurope program for monitoring, imaging, and modeling of the interplay between processes controlling continental topography and related natural hazards. TopoIberia is ...
Page 56. 56 ROA contributions to the ESEAS-RI project Cristina García Silva, Jorge Gárate, Jose M... more Page 56. 56 ROA contributions to the ESEAS-RI project Cristina García Silva, Jorge Gárate, Jose Martín-Davila San Fernando Naval Observatory, Plaza de las Marinas, 11110 San Fernando, Cádiz, Spain, email: cristina. garcia@ roa. ...
47 The ESEAS-RI CGPS data processing Halfdan Pascal Kierulf1, Richard M. Bingley2, Norman Teferle... more 47 The ESEAS-RI CGPS data processing Halfdan Pascal Kierulf1, Richard M. Bingley2, Norman Teferle2, Coskun Demir3, Ayhan Cingoz3, Hasan Yildiz3, Jorge Garate4, Jose Martin Davilla4, Cristina Garcia Silva4, Ryszard Zdunek5, Leszek Jaworski5, Juan J. Martinez-...
The goal of this paper is to study the velocity field and deformation parameters in Southern Spai... more The goal of this paper is to study the velocity field and deformation parameters in Southern Spain and surrounding areas (Ibero-Maghrebian region) using GPS episodic measurements. Results are compared to those previously published as well as deformation parameters derived from seismic data. For this purpose, a geodetic GPS network of 12 stations was observed during eight field campaigns from 1998 to 2005 by the San Fernando Naval Observatory (ROA), Spain. Relative GPS velocities in the Gulf of Cadiz with respect to the stable part of Eurasia are ∼4.1 mm/yr in a NW–SE to NNW–SSE direction. In the Betics, Alboran Sea and North of Morocco, velocities are ∼4.4 mm/yr in a NW–SE direction, and they are ∼2.3 mm/yr in a N–S direction in the eastern part of the Iberian Peninsula. These results are in agreement with the anticlockwise rotation of the African plate. GPS strain tensors are determined from the velocity model, to obtain a more realistic crustal deformation model. The Gulf of Cadiz is subjected to uniform horizontal compression in a NNW–SSE direction, with a rotation to N–S in the Alboran Sea and Northern Morocco. An extensional regime in a NW–SE direction, which rotates to W–E, is present in the Internal Betics area. In the Betic, Alboran Sea and North of Morocco regions we compare seismic deformation rates from shallow earthquakes with the determined GPS deformation rates. The comparison indicates a seismic coupling of 27%, while the remaining 73% might be generated in aseismic processes. Deformations measured in the Ibero-Maghrebian region with GPS could be interpreted in terms of either elastic loading or ductile deformation.
Abstract The earthquake true size and tsunami potential can be determined using GPS data up to on... more Abstract The earthquake true size and tsunami potential can be determined using GPS data up to only 15 minutes after earthquake initiation, by tracking the mean displacement of Earth&amp;amp;amp;amp;amp;#x27;s surface associated with the arrival of seismic waves (Blewitt, 2006). We are using ...
... Authors: Pazos, Antonio; Martín Davila, José; Buforn, Elisa; Gárate Pasquín, Jorge; Catalán M... more ... Authors: Pazos, Antonio; Martín Davila, José; Buforn, Elisa; Gárate Pasquín, Jorge; Catalán Morollón, Manuel; Hanka, Winfried; Udías, Agustín ... with the deployment of a new submarine and on-land geophysical observatory in the Alboran island (ALBO Observatory), where a ...
Sea level is an environmental variable which is widely recognised as being important in many scie... more Sea level is an environmental variable which is widely recognised as being important in many scientific disciplines as a control parameter for coastal dynamical processes or climate processes in the coupled atmosphere-ocean systems, as well as engineering applications. A major source of sea-level data are the national networks of coastal tide gauges, in Spain belonging to different institutions as the Instituto Geografico Nacional (IGN), Puertos del Estado (PE), Instituto Hidrografico de la Marina (IHM), etc. Three Spanish sites for monitoring sea level are located in Ibiza island, l'Estartit and Barcelona. L'Estartit tide gauge is a classical floating tide gauge set up in l'Estartit harbour (NE Spain) in 1990. Data are taken in graphics registers from which each two hours the mean value is recorded in an electronic support and delivered to the Permanent Service for Mean Sea level (PSMSL). Periodic surveying campaigns along the year are carried out for monitoring possible vertical movement of the geodetic benchmark adjacent to the tide gauge. In the framework of a Spanish Space Project, the instrumentation of sea level measurements has been improved by providing the Barcelona site with a radar tide gauge and with a continuous GPS station nearby. The radar tide gauge is a Datamar 3000C device and a Thales Navigation Internet- Enabled GPS Continuous Geodetic Reference Station (iCGRS) with a choke ring antenna. It is intended that the overall system will constitute a CGPS Station of the ESEAS (European Sea Level) and TIGA (GPS Tide Gauge Benchmark Monitoring) networks. Puertos del Estado (Spanish Harbours) installed the tide gauge station at Ibiza harbour in lanuary 2003. The station belongs to the REDMAR network, composed at this moment by 21 stations distributed along the whole Spanish waters, including also the Canary islands (http://www.puertos.es). The tide gauge also belongs to the ESEAS (European Sea Level) network. Also it has a radar tide gauge at Barcelona- - harbour.A description of the actual infrastructure at Ibiza, l'Estartit and Barcelona is presented and its applications to sea level monitoring and altimeter calibration in support of the main CGPS at Ibiza harbour. Three Begur Cape experiences on radar altimeter calibration and marine geoid mapping were made on 1999, 2000 and 2002. One campaign was also made in lune 2003 at the Ibiza island area. GPS buoys and GPS catamaran were used. We present a synthesis of the sea level results results obtained from TOPEX/POSEIDON and JASON-1 altimeter calibration campaigns using the direct measurements from GPS buoys and the derived marine geoid. The main objective of the marine campaigns is to check the value of Ibiza Island as a permanent calibration site in the western Mediterranean Sea, to complement the Corsica site in the network of altimeter calibration sites.Now there is preparation for a new Ibiza/Cape of Begur altimeter calibration campaign after launch of JASON-2 at the Vanderbergh site scheduled on lune 20, 2008.
A new continuous GPS network was installed under the umbrella of a research project called ''Geoc... more A new continuous GPS network was installed under the umbrella of a research project called ''Geociencias en Iberia: Estudios integrados de topografía y evolución 4D (Topo-Iberia)'', to improve understanding of kinematic behavior of the Iberian Peninsula region. Here we present a velocity field based on the analysis of the 4 years of data from 25 stations constituting the network, which were analyzed by three different analysis groups contributing to the project. Different geodetic software packages (GIPSY-OASIS, Bernese and GAMIT) as well as different approaches were used to estimate rates of present day crustal deformation in the Iberian Peninsula and Morocco. In order to ensure the consistency of the velocity fields determined by the three groups, the velocities obtained by each analysis center were transformed into a common Eurasia Reference Frame. After that, the strain rate field was calculated. The results put in evidence more prominent residual motions in Morocco and southernmost part of the Iberian Peninsula. In particular, the dilatation and shear strain rates reach their maximum values in the Central Betics and northern Alboran Sea. A small region of high shear strain rate is observed in the east-central part of the peninsula and another deformation focus is located around the Strait of Gibraltar and the Gulf of Cadiz.
Physics and Chemistry of the Earth, Parts A/B/C, 2008
Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level... more Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level from vertical land movements tide gauges are often co-located with Continuous GPS (CGPS). In order to achieve an accuracy of better than 1 mm/yr, as required for sea level studies in the global change context, vertical land motion needs to be determined with the same accuracy. This is an ambitious goal for CGPS and needs a carefully designed analysis strategy. We have compared the independent results from six different analysis centres, using three different GPS processing softwares and a number of different analysis strategies.
We present GPS observations in Morocco and adjacent areas of Spain from 15 continuous (CGPS) and ... more We present GPS observations in Morocco and adjacent areas of Spain from 15 continuous (CGPS) and 31 survey-mode (SGPS) sites extending from the stable part of the Nubian plate to central Spain. We determine a robust velocity field for the W Mediterranean that we use to constrain models for the Iberia-Nubia plate boundary. South of the High Atlas Mountain system, GPS motions are consistent with Nubia plate motions from prior geodetic studies. We constrain shortening in the Atlas system to <1.5 mm/yr, 95% confidence level. North of the Atlas Mountains, the GPS velocities indicate Nubia motion with respect to Eurasia, but also a component of motion normal to the direction of Nubia-Eurasia motion, consisting of southward translation of the Rif Mountains in N Morocco at rates exceeding 5 mm/yr. This southward motion appears to be directly related to Miocene opening of the Alboran Sea. The Betic Mountain system north of the Alboran Sea is characterized by WNW motion with respect to Eurasia at ∼1-2 mm/yr, paralleling Nubia-Eurasia relative motion. In addition, sites located in the Betics north of the southerly moving Rif Mountains also indicate a component of southerly motion with respect to Eurasia. We interpret this as indicating that deformation associated with Nubia-Eurasia plate motion extends into the southern Betics, but also that the Betic system may be affected by the same processes that are causing southward motion of the Rif Mountains south of the Alboran Sea. Kinematic modeling indicates that plate boundary geometries that include a boundary through the Straits of Gibraltar are most compatible with the component of motion in the direction of relative plate motion, but that two additional blocks (Alboran-Rif block, Betic Mountain block), independent of both Nubia and Eurasia are needed to account for the motions of the Rif and Betic Mountains normal to the direction of relative plate motion. We speculate that the southward motions of the Alboran-Rif and Betic blocks may be related to mantle flow, possibly induced by southward rollback of the subducted Nubian plate beneath the Alboran Sea and Rif Mountains. (P. Vernant), [email protected] (A. Fadil), [email protected] (T. Mourabit), [email protected] (D. Ouazar), [email protected] (J.M. Davila), [email protected] (R. Reilinger).
Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level... more Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level from vertical land movements tide gauges are often co-located with Continuous GPS (CGPS). In order to achieve an accuracy of better than 1 mm/yr, as required for sea level studies in the global change context, vertical land motion needs to be determined with the same accuracy. This is an ambitious goal for CGPS and needs a carefully designed analysis strategy. We have compared the independent results from six different analysis centres, using three different GPS processing softwares and a number of different analysis strategies.
In the framework of the European Union SEa Level Fluctuations (SELF) I and the SELF II Projects d... more In the framework of the European Union SEa Level Fluctuations (SELF) I and the SELF II Projects designed to study sea level variations around the Mediterranean and Black Seas, the Global Positioning System (GPS) technique was adopted to measure the ongoing crustal movements at tide gauge stations. Tide gauges measure sea-level variations with respect to a ground benchmark. In order to determine true sea-level variations of a few millimeters per year, it is necessary to estimate the ground vertical movement to a high degree of accuracy. Countries involved in the projects were Spain, France, Italy, Greece, Bulgaria and Russia. In the period from 1993 to 1998 repeated observations at more than 28 tide gauges and at a number of reference and intermediate stations were conducted. GPS measurements were complemented by Water Vapor Radiometers (WVR) at selected sites. Individual campaigns were evaluated and analyzed and showed height variations in the millimetercentimeter range. All data were processed following common standards using the Bernese Software in a unified analysis to generate a combined solution. Based on the normal equations of all of the campaigns, a combined solution for the SELF 0921-8181/02/$ -see front matter D 2002 Elsevier Science B.V. All rights reserved. PII: S 0 9 2 1 -8 1 8 1 ( 0 2 ) 0 0 1 0 3 -0 * Corresponding author. University of the Bundeswehr
Physics and Chemistry of The Earth Part A-solid Earth and Geodesy, 2001
... Calais&amp;amp;amp;amp;amp;amp;amp;#x27;, J. Talaya&amp;amp;amp;amp;amp;amp;amp;#x27;... more ... Calais&amp;amp;amp;amp;amp;amp;amp;#x27;, J. Talaya&amp;amp;amp;amp;amp;amp;amp;#x27;, A. Rius4, R Vesper, R. Santangelo&amp;amp;amp;amp;amp;amp;amp;#x27;, X. Y Huang&amp;amp;amp;amp;amp;amp;amp;#x27;, JM Davila&amp;amp;amp;amp;amp;amp;amp;#x27;, M. Gel, L. Cucurul14, A. Flores&amp;amp;amp;amp;amp;amp;amp;#x27;, C. Sciarrettas ... validating robust GPS integrated water vapor (IWV) and 2) Validation and performance verification of the zenith tropospheric delay (ZTD) data sets and ...
Desde su fundación en el año 1753, el Real Instituto y Observatorio de la Armada (ROA) ha realiza... more Desde su fundación en el año 1753, el Real Instituto y Observatorio de la Armada (ROA) ha realizado diferentes actividades en el campo de la Geofísica, inicialmente en Meteorología, posteriormente ampliadas al Geomagnetismo y Sismología y, de forma más reciente, al seguimiento de satélites artificiales por técnicas láser y GPS. Asimismo, la participación del ROA en campañas geofísicas marinas y terrestres ha sido también muy activa. En el presente trabajo se hace una breve reseña histórica de dichas actividades y se describe, con un poco más de amplitud, su situación actual.
Abstract A local ties survey in the San Fernando Naval Observatory (ROA: Real Observatorio de la ... more Abstract A local ties survey in the San Fernando Naval Observatory (ROA: Real Observatorio de la Armada) was carried out by the Instituto Geografico Nacional de España (IGNE) team during the summer of 2009. A SLR station (SFEL) contributing to the ...
The Eurasian-African plate boundary crosses the called &amp;amp;amp;amp;amp;amp;amp;quot;Iber... more The Eurasian-African plate boundary crosses the called &amp;amp;amp;amp;amp;amp;amp;quot;Ibero-Maghrebian&amp;amp;amp;amp;amp;amp;amp;quot; region from San Vicente Cape (SW Portugal) to Tunisia including the South of Iberia, Alboran Sea, and northern of Morocco and Algeria. The low convergence rate at this plate boundary produces a continuous moderate seismic activity of low magnitude and shallow depth, where the occurrence of large earthquakes is separated by long
Abstract The Iberian Peninsula is one of the natural laboratories proposed in the framework of th... more Abstract The Iberian Peninsula is one of the natural laboratories proposed in the framework of the TopoEurope program for monitoring, imaging, and modeling of the interplay between processes controlling continental topography and related natural hazards. TopoIberia is ...
Page 56. 56 ROA contributions to the ESEAS-RI project Cristina García Silva, Jorge Gárate, Jose M... more Page 56. 56 ROA contributions to the ESEAS-RI project Cristina García Silva, Jorge Gárate, Jose Martín-Davila San Fernando Naval Observatory, Plaza de las Marinas, 11110 San Fernando, Cádiz, Spain, email: cristina. garcia@ roa. ...
47 The ESEAS-RI CGPS data processing Halfdan Pascal Kierulf1, Richard M. Bingley2, Norman Teferle... more 47 The ESEAS-RI CGPS data processing Halfdan Pascal Kierulf1, Richard M. Bingley2, Norman Teferle2, Coskun Demir3, Ayhan Cingoz3, Hasan Yildiz3, Jorge Garate4, Jose Martin Davilla4, Cristina Garcia Silva4, Ryszard Zdunek5, Leszek Jaworski5, Juan J. Martinez-...
The goal of this paper is to study the velocity field and deformation parameters in Southern Spai... more The goal of this paper is to study the velocity field and deformation parameters in Southern Spain and surrounding areas (Ibero-Maghrebian region) using GPS episodic measurements. Results are compared to those previously published as well as deformation parameters derived from seismic data. For this purpose, a geodetic GPS network of 12 stations was observed during eight field campaigns from 1998 to 2005 by the San Fernando Naval Observatory (ROA), Spain. Relative GPS velocities in the Gulf of Cadiz with respect to the stable part of Eurasia are ∼4.1 mm/yr in a NW–SE to NNW–SSE direction. In the Betics, Alboran Sea and North of Morocco, velocities are ∼4.4 mm/yr in a NW–SE direction, and they are ∼2.3 mm/yr in a N–S direction in the eastern part of the Iberian Peninsula. These results are in agreement with the anticlockwise rotation of the African plate. GPS strain tensors are determined from the velocity model, to obtain a more realistic crustal deformation model. The Gulf of Cadiz is subjected to uniform horizontal compression in a NNW–SSE direction, with a rotation to N–S in the Alboran Sea and Northern Morocco. An extensional regime in a NW–SE direction, which rotates to W–E, is present in the Internal Betics area. In the Betic, Alboran Sea and North of Morocco regions we compare seismic deformation rates from shallow earthquakes with the determined GPS deformation rates. The comparison indicates a seismic coupling of 27%, while the remaining 73% might be generated in aseismic processes. Deformations measured in the Ibero-Maghrebian region with GPS could be interpreted in terms of either elastic loading or ductile deformation.
Abstract The earthquake true size and tsunami potential can be determined using GPS data up to on... more Abstract The earthquake true size and tsunami potential can be determined using GPS data up to only 15 minutes after earthquake initiation, by tracking the mean displacement of Earth&amp;amp;amp;amp;amp;#x27;s surface associated with the arrival of seismic waves (Blewitt, 2006). We are using ...
... Authors: Pazos, Antonio; Martín Davila, José; Buforn, Elisa; Gárate Pasquín, Jorge; Catalán M... more ... Authors: Pazos, Antonio; Martín Davila, José; Buforn, Elisa; Gárate Pasquín, Jorge; Catalán Morollón, Manuel; Hanka, Winfried; Udías, Agustín ... with the deployment of a new submarine and on-land geophysical observatory in the Alboran island (ALBO Observatory), where a ...
Sea level is an environmental variable which is widely recognised as being important in many scie... more Sea level is an environmental variable which is widely recognised as being important in many scientific disciplines as a control parameter for coastal dynamical processes or climate processes in the coupled atmosphere-ocean systems, as well as engineering applications. A major source of sea-level data are the national networks of coastal tide gauges, in Spain belonging to different institutions as the Instituto Geografico Nacional (IGN), Puertos del Estado (PE), Instituto Hidrografico de la Marina (IHM), etc. Three Spanish sites for monitoring sea level are located in Ibiza island, l'Estartit and Barcelona. L'Estartit tide gauge is a classical floating tide gauge set up in l'Estartit harbour (NE Spain) in 1990. Data are taken in graphics registers from which each two hours the mean value is recorded in an electronic support and delivered to the Permanent Service for Mean Sea level (PSMSL). Periodic surveying campaigns along the year are carried out for monitoring possible vertical movement of the geodetic benchmark adjacent to the tide gauge. In the framework of a Spanish Space Project, the instrumentation of sea level measurements has been improved by providing the Barcelona site with a radar tide gauge and with a continuous GPS station nearby. The radar tide gauge is a Datamar 3000C device and a Thales Navigation Internet- Enabled GPS Continuous Geodetic Reference Station (iCGRS) with a choke ring antenna. It is intended that the overall system will constitute a CGPS Station of the ESEAS (European Sea Level) and TIGA (GPS Tide Gauge Benchmark Monitoring) networks. Puertos del Estado (Spanish Harbours) installed the tide gauge station at Ibiza harbour in lanuary 2003. The station belongs to the REDMAR network, composed at this moment by 21 stations distributed along the whole Spanish waters, including also the Canary islands (http://www.puertos.es). The tide gauge also belongs to the ESEAS (European Sea Level) network. Also it has a radar tide gauge at Barcelona- - harbour.A description of the actual infrastructure at Ibiza, l'Estartit and Barcelona is presented and its applications to sea level monitoring and altimeter calibration in support of the main CGPS at Ibiza harbour. Three Begur Cape experiences on radar altimeter calibration and marine geoid mapping were made on 1999, 2000 and 2002. One campaign was also made in lune 2003 at the Ibiza island area. GPS buoys and GPS catamaran were used. We present a synthesis of the sea level results results obtained from TOPEX/POSEIDON and JASON-1 altimeter calibration campaigns using the direct measurements from GPS buoys and the derived marine geoid. The main objective of the marine campaigns is to check the value of Ibiza Island as a permanent calibration site in the western Mediterranean Sea, to complement the Corsica site in the network of altimeter calibration sites.Now there is preparation for a new Ibiza/Cape of Begur altimeter calibration campaign after launch of JASON-2 at the Vanderbergh site scheduled on lune 20, 2008.
Uploads
Papers by Jorge Garate