Peter Danecek - Academia.edu (original) (raw)
Papers by Peter Danecek
Sintesi delle attività svolte dal coordinamento delle reti sismiche mobili INGV in emergenza, den... more Sintesi delle attività svolte dal coordinamento delle reti sismiche mobili INGV in emergenza, denominato SISMIKO, nel primo mese della sequenza sismica "Amatrice" seguita al terremoto di Mw 6.0 del 24 agosto 2016 (01:36 UTC). Descrizione della rete sismica implementata e prime analisi dei dati acquisiti. Report on the activities in the first month of emergency by coordination of mobile seismic networks INGV emergency, called SISMIKO, after the Mw 6.0 Amatrice earthquake (August 24th, 2016, central italy). Description of the temporary seismic network implemented and preliminary analysis of the acquired data.
70th EAGE Conference and Exhibition incorporating SPE EUROPEC 2008, 2008
In this work we propose an efficient and scalable parallel Chebyshev pseudo-spectral method for l... more In this work we propose an efficient and scalable parallel Chebyshev pseudo-spectral method for large scale 3D seismic forward modelling. The Multidomain Block Decomposition method divides the whole computational domain into a large number of subdomains. On these subdomains the pseudospectral Chebyshev operator is applied locally. Thereby the global character of a pseudospectral operator is avoided and the method makes efficient and scalable implementations possible. The overlap implicitly ensures continuity of the field variables without complicated coupling schemes. We implement a parallel version of the method in order to obtain sufficient high frequencies. The method and the implementation are tested with various setups and the scalability is demonstrated.
<p>In the Southern Hemisphere, the prevalence of the oceans and the difficulty of a... more <p>In the Southern Hemisphere, the prevalence of the oceans and the difficulty of access to land result in a lack of coverage of seismological station which is a strong limitation Our knowledge of the Earth&#8217;s structures and of large earthquakes sources. This is particularly critical inside the Antarctic continent where only two permanent seismological stations are currently available (QSPA and CCD). Among them, the seismological station CCD is a joint program between EOST (Strasbourg) and INGV (Roma) and is installed at the Concordia scientific base (75&#176;S 123&#176;E). This observatory, built in 2000 with state-of-the-art surface instrumentation installed in a vault made of snow-covered containers, meets the required quality criteria and has been part of the GEOSCOPE network since 2008. However, it has become necessary to replace this installation for safety reasons, recurring snow coverage issues and seismological performances. The existing seismic vault is deformed by the hydrostatic pressure of the snow. Its proximity to the base causes strong daytime noise (~30 dB) at high frequencies (>1 Hz); the unconsolidated layer of snow about 100m thick forms a waveguide that traps anthropogenic noise from the base. In addition, a coupling defect of the instruments in contact with the snow limits the performance at low frequencies (< 0.03 Hz) on the horizontal channels.</p><p>Eight years ago, we proposed to install a borehole seismometer at a depth of 120m to limit the waveguide effects. A new shelter on stilt and the borehole drilling were carried out in 2018/2019. The installation of all the instrumentation has been completed by our team in January 2020. The analyses of the data show that the high-frequency disturbances are very largely attenuated (-30 dB at 10 Hz) compared to the surface installation and that the horizontal channels have a lower noise level at low frequencies (-20 dB at 0.01Hz). In addition, data for all components are below the standard noise model for frequencies between 5 and 9Hz, which already makes this new station one of the quietest installations in the world for those frequencies. A few problems remain to be solved, such as atmospheric pressure-related perturbations for periods longer than 600s on the vertical component. We are currently implementing several patches to try to better insulate the borehole. Updates will be presented during the meeting. Despite this problem at long period, the new CCD borehole stations is a success with better-than-expected performances at all periods shorter than 500s. The data produced are now distributed in the world data centers as G.CCD.20.</p>
La rete sismica temporanea installata dal gruppo operativo INGV SISMIKO a seguito del terremoto d... more La rete sismica temporanea installata dal gruppo operativo INGV SISMIKO a seguito del terremoto del 24 agosto 2016 tra i Monti della Laga e la Valnerina, è stata ampliata nel settore settentrionale a seguito dei forti terremoti avvenuti alla fine del mese di ottobre 2016. Successivamente alle due scosse di M<sub>w</sub> 5.4 e 5.9 che il 26 ottobre hanno interessato l'area al confine Marche-Umbria tra i Comuni di Castelsantangelo sul Nera (MC), Norcia (PG) e Arquata del Tronto (AP), la geometria della rete è stata estesa di circa 25 km verso nord con l'attivazione di ulteriori tre stazioni temporanee di cui una, da subito, disposta per la trasmissione dei dati in tempo reale e per l'inserimento nel sistema di sorveglianza sismica dell'Istituto Nazionale di Geofisica e Vulcanologia (INGV). Un'ultima stazione è stata inoltre installata nei pressi di Campello del Clitunno in provincia di Perugia ad ovest della sequenza, a seguito del terremoto M<sub>...
AGU Fall Meeting Abstracts, Dec 1, 2013
Seismological Research Letters, 2021
The European Integrated Data Archive (EIDA) is the infrastructure that provides access to the sei... more The European Integrated Data Archive (EIDA) is the infrastructure that provides access to the seismic-waveform archives collected by European agencies. This distributed system is managed by Observatories and Research Facilities for European Seismology. EIDA provides seamless access to seismic data from 12 data archives across Europe by means of standard services, exposing data on behalf of hundreds of network operators and research organizations. More than 12,000 stations from permanent and temporary networks equipped with seismometers, accelerometers, pressure sensors, and other sensors are accessible through the EIDA federated services. A growing user base currently counting around 3000 unique users per year has been requesting data and using EIDA services. The EIDA system is designed to scale up to support additional new services, data types, and nodes. Data holdings, services, and user numbers have grown substantially since the establishment of EIDA in 2013. EIDA is currently ac...
Annals of Geophysics, 2016
At 01:36 UTC (03:36 local time) on August 24th 2016, an earthquake Mw 6.0 struck an extensive sec... more At 01:36 UTC (03:36 local time) on August 24th 2016, an earthquake Mw 6.0 struck an extensive sector of the central Apennines (coordinates: latitude 42.70° N, longitude 13.23° E, 8.0 km depth). The earthquake caused about 300 casualties and severe damage to the historical buildings and economic activity in an area located near the borders of the Umbria, Lazio, Abruzzo and Marche regions. The Istituto Nazionale di Geofisica e Vulcanologia (INGV) located in few minutes the hypocenter near Accumoli, a small town in the province of Rieti. In the hours after the quake, dozens of events were recorded by the National Seismic Network (Rete Sismica Nazionale, RSN) of the INGV, many of which had a ML > 3.0. The density and coverage of the RSN in the epicentral area meant the epicenter and magnitude of the main event and subsequent shocks that followed it in the early hours of the seismic sequence were well constrained. However, in order to better constrain the localizations of the aftersho...
Computers & Geosciences, 2011
We present two projects in seismology that have been ported to web technologies, which provide re... more We present two projects in seismology that have been ported to web technologies, which provide results in Keyhole Markup Language (KML) visualization layers. These use the Google Earth geobrowser as the flexible platform that can substitute specialized graphical tools to perform qualitative visual data analyses and comparisons. The Network of Research Infrastructures for European Seismology (NERIES) Tomographic Earth Model Repository contains data sets from over 20 models from the literature. A hierarchical structure of folders that represent the sets of depths for each model is implemented in KML, and this immediately results into an intuitive interface for users to navigate freely and to compare tomographic plots. The KML layer for the European-Mediterranean Regional Centroid-Moment Tensor Catalog displays the focal mechanism solutions or moderate-magnitude Earthquakes from 1997 to the present. Our aim in both projects was to also propose standard representations of scientific data sets. Here, the general semantic approach of an XML framework has an important impact that must be further explored, although we find the KML syntax to more emphasis on aspects of detailed visualization. We have thus used, and propose the use of, Javascript Object Notation (JSON), another semantic notation that stems from the web-development community that provides a compact, general-purpose, data-exchange format.
Seismological Research Letters, 2021
The Orfeus European Integrated Data Archive (EIDA) provides a federated approach to the dissemina... more The Orfeus European Integrated Data Archive (EIDA) provides a federated approach to the dissemination of seismological waveform data and ensures access to 12 regional seismological data centers—the EIDA nodes. The Istituto Nazionale di Geofisica e Vulcanologia (INGV) is one of the founding partners of this EIDA federation and manages the EIDA data distribution node in Italy. INGV has actively managed the smaller MedNet archive since 1990 and adopted a more comprehensive and systematic approach to seismological data archiving since 2007. The Italian EIDA node data archive currently totals 90 TBytes of waveform data available for download, originating from 25 networks and 974 stations, provided by INGV, MedNet, or contributed by various partner institutions. Geographically, it covers mainly Italy and some stations from the Mediterranean region. The archive is currently growing at a rate of approximately 11 TB/yr. INGV recently strengthened its data management capabilities, resources, ...
Annals of Geophysics, 2016
At 01:36:32 UTC on August 24, 2016 an earthquake of magnitude 6.0 occurred in Central Italy, affe... more At 01:36:32 UTC on August 24, 2016 an earthquake of magnitude 6.0 occurred in Central Italy, affecting many small towns and municipalities in the Lazio, Umbria, Marche and Abruzzo regions. The event caused severe damages, many victims and 299 fatalities. Only 21 seconds after the beginning of the earthquake, the first automatic location of this earthquake was available and stored in our earthquakes database. The first magnitude estimate followed 68 seconds after the origin time. Few seconds later the INGV seismologists on duty in accordance to the agreed protocols provided the first alert to the Italian Civil Protection Department (Dipartimento di Protezione Civile, DPC) and thereby triggered the seismic emergency protocol. Subsequently, they elaborated the data in order to produce the first manually reviewed hypocenter, which was published on the Institute’s website at 01:53:18 UTC. The sequence following this mainshock generated thousands of earthquakes in the epicentral area, whi...
Seismological Research Letters, 2021
The Istituto Nazionale di Geofisica e Vulcanologia (INGV) is an Italian research institution with... more The Istituto Nazionale di Geofisica e Vulcanologia (INGV) is an Italian research institution with focus on earth sciences. Moreover, the INGV is the operational center for seismic surveillance and earthquake monitoring in Italy and is a part of the civil protection system as a center of expertise on seismic, volcanic, and tsunami risks.INGV operates the Italian National Seismic Network and other networks at national scale and is a primary node of the European Integrated Data Archive for archiving and distributing strong-motion and weak-motion seismic recordings. In the control room in Rome, INGV staff performs seismic surveillance and tsunami warning services; in Catania and Naples, the control rooms are devoted to volcanic surveillance. Volcano monitoring includes locating earthquakes in the regions around the Sicilian (Etna, Eolian Islands, and Pantelleria) and the Campanian (Vesuvius, Campi Fregrei, and Ischia) active volcanoes. The tsunami warning is based on earthquake location...
Seismological Research Letters, 2019
Starting in 1988, with the installation of the first broadband (BB) instrument in Italy, the Medi... more Starting in 1988, with the installation of the first broadband (BB) instrument in Italy, the Mediterranean Very Broadband Seismographic Network (MedNet) program established a backbone network of BB stations of the highest quality in the Mediterranean Sea countries. The Mediterranean region is characterized by relevant and frequent seismicity related to its complex tectonics, due to the convergence of two major plates, Africa and Eurasia, and the involvement of other minor plates, as the Adriatic plate. Therefore, the MedNet project became a scientific research infrastructure of excellence, able to fill the gap of regional coverage when the availability of seismic BB instruments was still scarce. The main characteristics of the MedNet network are the highest quality of the seismographic instrumentation at remote sites and very low level of anthropogenic noise with stable conditions of pressure and temperature. After 30 yr of recordings, the MedNet program has proven that the early ad...
Sintesi delle attività svolte dal coordinamento delle reti sismiche mobili INGV in emergenza, den... more Sintesi delle attività svolte dal coordinamento delle reti sismiche mobili INGV in emergenza, denominato SISMIKO, nel primo mese della sequenza sismica "Amatrice" seguita al terremoto di Mw 6.0 del 24 agosto 2016 (01:36 UTC). Descrizione della rete sismica implementata e prime analisi dei dati acquisiti. Report on the activities in the first month of emergency by coordination of mobile seismic networks INGV emergency, called SISMIKO, after the Mw 6.0 Amatrice earthquake (August 24th, 2016, central italy). Description of the temporary seismic network implemented and preliminary analysis of the acquired data.
70th EAGE Conference and Exhibition incorporating SPE EUROPEC 2008, 2008
In this work we propose an efficient and scalable parallel Chebyshev pseudo-spectral method for l... more In this work we propose an efficient and scalable parallel Chebyshev pseudo-spectral method for large scale 3D seismic forward modelling. The Multidomain Block Decomposition method divides the whole computational domain into a large number of subdomains. On these subdomains the pseudospectral Chebyshev operator is applied locally. Thereby the global character of a pseudospectral operator is avoided and the method makes efficient and scalable implementations possible. The overlap implicitly ensures continuity of the field variables without complicated coupling schemes. We implement a parallel version of the method in order to obtain sufficient high frequencies. The method and the implementation are tested with various setups and the scalability is demonstrated.
<p>In the Southern Hemisphere, the prevalence of the oceans and the difficulty of a... more <p>In the Southern Hemisphere, the prevalence of the oceans and the difficulty of access to land result in a lack of coverage of seismological station which is a strong limitation Our knowledge of the Earth&#8217;s structures and of large earthquakes sources. This is particularly critical inside the Antarctic continent where only two permanent seismological stations are currently available (QSPA and CCD). Among them, the seismological station CCD is a joint program between EOST (Strasbourg) and INGV (Roma) and is installed at the Concordia scientific base (75&#176;S 123&#176;E). This observatory, built in 2000 with state-of-the-art surface instrumentation installed in a vault made of snow-covered containers, meets the required quality criteria and has been part of the GEOSCOPE network since 2008. However, it has become necessary to replace this installation for safety reasons, recurring snow coverage issues and seismological performances. The existing seismic vault is deformed by the hydrostatic pressure of the snow. Its proximity to the base causes strong daytime noise (~30 dB) at high frequencies (>1 Hz); the unconsolidated layer of snow about 100m thick forms a waveguide that traps anthropogenic noise from the base. In addition, a coupling defect of the instruments in contact with the snow limits the performance at low frequencies (< 0.03 Hz) on the horizontal channels.</p><p>Eight years ago, we proposed to install a borehole seismometer at a depth of 120m to limit the waveguide effects. A new shelter on stilt and the borehole drilling were carried out in 2018/2019. The installation of all the instrumentation has been completed by our team in January 2020. The analyses of the data show that the high-frequency disturbances are very largely attenuated (-30 dB at 10 Hz) compared to the surface installation and that the horizontal channels have a lower noise level at low frequencies (-20 dB at 0.01Hz). In addition, data for all components are below the standard noise model for frequencies between 5 and 9Hz, which already makes this new station one of the quietest installations in the world for those frequencies. A few problems remain to be solved, such as atmospheric pressure-related perturbations for periods longer than 600s on the vertical component. We are currently implementing several patches to try to better insulate the borehole. Updates will be presented during the meeting. Despite this problem at long period, the new CCD borehole stations is a success with better-than-expected performances at all periods shorter than 500s. The data produced are now distributed in the world data centers as G.CCD.20.</p>
La rete sismica temporanea installata dal gruppo operativo INGV SISMIKO a seguito del terremoto d... more La rete sismica temporanea installata dal gruppo operativo INGV SISMIKO a seguito del terremoto del 24 agosto 2016 tra i Monti della Laga e la Valnerina, è stata ampliata nel settore settentrionale a seguito dei forti terremoti avvenuti alla fine del mese di ottobre 2016. Successivamente alle due scosse di M<sub>w</sub> 5.4 e 5.9 che il 26 ottobre hanno interessato l'area al confine Marche-Umbria tra i Comuni di Castelsantangelo sul Nera (MC), Norcia (PG) e Arquata del Tronto (AP), la geometria della rete è stata estesa di circa 25 km verso nord con l'attivazione di ulteriori tre stazioni temporanee di cui una, da subito, disposta per la trasmissione dei dati in tempo reale e per l'inserimento nel sistema di sorveglianza sismica dell'Istituto Nazionale di Geofisica e Vulcanologia (INGV). Un'ultima stazione è stata inoltre installata nei pressi di Campello del Clitunno in provincia di Perugia ad ovest della sequenza, a seguito del terremoto M<sub>...
AGU Fall Meeting Abstracts, Dec 1, 2013
Seismological Research Letters, 2021
The European Integrated Data Archive (EIDA) is the infrastructure that provides access to the sei... more The European Integrated Data Archive (EIDA) is the infrastructure that provides access to the seismic-waveform archives collected by European agencies. This distributed system is managed by Observatories and Research Facilities for European Seismology. EIDA provides seamless access to seismic data from 12 data archives across Europe by means of standard services, exposing data on behalf of hundreds of network operators and research organizations. More than 12,000 stations from permanent and temporary networks equipped with seismometers, accelerometers, pressure sensors, and other sensors are accessible through the EIDA federated services. A growing user base currently counting around 3000 unique users per year has been requesting data and using EIDA services. The EIDA system is designed to scale up to support additional new services, data types, and nodes. Data holdings, services, and user numbers have grown substantially since the establishment of EIDA in 2013. EIDA is currently ac...
Annals of Geophysics, 2016
At 01:36 UTC (03:36 local time) on August 24th 2016, an earthquake Mw 6.0 struck an extensive sec... more At 01:36 UTC (03:36 local time) on August 24th 2016, an earthquake Mw 6.0 struck an extensive sector of the central Apennines (coordinates: latitude 42.70° N, longitude 13.23° E, 8.0 km depth). The earthquake caused about 300 casualties and severe damage to the historical buildings and economic activity in an area located near the borders of the Umbria, Lazio, Abruzzo and Marche regions. The Istituto Nazionale di Geofisica e Vulcanologia (INGV) located in few minutes the hypocenter near Accumoli, a small town in the province of Rieti. In the hours after the quake, dozens of events were recorded by the National Seismic Network (Rete Sismica Nazionale, RSN) of the INGV, many of which had a ML > 3.0. The density and coverage of the RSN in the epicentral area meant the epicenter and magnitude of the main event and subsequent shocks that followed it in the early hours of the seismic sequence were well constrained. However, in order to better constrain the localizations of the aftersho...
Computers & Geosciences, 2011
We present two projects in seismology that have been ported to web technologies, which provide re... more We present two projects in seismology that have been ported to web technologies, which provide results in Keyhole Markup Language (KML) visualization layers. These use the Google Earth geobrowser as the flexible platform that can substitute specialized graphical tools to perform qualitative visual data analyses and comparisons. The Network of Research Infrastructures for European Seismology (NERIES) Tomographic Earth Model Repository contains data sets from over 20 models from the literature. A hierarchical structure of folders that represent the sets of depths for each model is implemented in KML, and this immediately results into an intuitive interface for users to navigate freely and to compare tomographic plots. The KML layer for the European-Mediterranean Regional Centroid-Moment Tensor Catalog displays the focal mechanism solutions or moderate-magnitude Earthquakes from 1997 to the present. Our aim in both projects was to also propose standard representations of scientific data sets. Here, the general semantic approach of an XML framework has an important impact that must be further explored, although we find the KML syntax to more emphasis on aspects of detailed visualization. We have thus used, and propose the use of, Javascript Object Notation (JSON), another semantic notation that stems from the web-development community that provides a compact, general-purpose, data-exchange format.
Seismological Research Letters, 2021
The Orfeus European Integrated Data Archive (EIDA) provides a federated approach to the dissemina... more The Orfeus European Integrated Data Archive (EIDA) provides a federated approach to the dissemination of seismological waveform data and ensures access to 12 regional seismological data centers—the EIDA nodes. The Istituto Nazionale di Geofisica e Vulcanologia (INGV) is one of the founding partners of this EIDA federation and manages the EIDA data distribution node in Italy. INGV has actively managed the smaller MedNet archive since 1990 and adopted a more comprehensive and systematic approach to seismological data archiving since 2007. The Italian EIDA node data archive currently totals 90 TBytes of waveform data available for download, originating from 25 networks and 974 stations, provided by INGV, MedNet, or contributed by various partner institutions. Geographically, it covers mainly Italy and some stations from the Mediterranean region. The archive is currently growing at a rate of approximately 11 TB/yr. INGV recently strengthened its data management capabilities, resources, ...
Annals of Geophysics, 2016
At 01:36:32 UTC on August 24, 2016 an earthquake of magnitude 6.0 occurred in Central Italy, affe... more At 01:36:32 UTC on August 24, 2016 an earthquake of magnitude 6.0 occurred in Central Italy, affecting many small towns and municipalities in the Lazio, Umbria, Marche and Abruzzo regions. The event caused severe damages, many victims and 299 fatalities. Only 21 seconds after the beginning of the earthquake, the first automatic location of this earthquake was available and stored in our earthquakes database. The first magnitude estimate followed 68 seconds after the origin time. Few seconds later the INGV seismologists on duty in accordance to the agreed protocols provided the first alert to the Italian Civil Protection Department (Dipartimento di Protezione Civile, DPC) and thereby triggered the seismic emergency protocol. Subsequently, they elaborated the data in order to produce the first manually reviewed hypocenter, which was published on the Institute’s website at 01:53:18 UTC. The sequence following this mainshock generated thousands of earthquakes in the epicentral area, whi...
Seismological Research Letters, 2021
The Istituto Nazionale di Geofisica e Vulcanologia (INGV) is an Italian research institution with... more The Istituto Nazionale di Geofisica e Vulcanologia (INGV) is an Italian research institution with focus on earth sciences. Moreover, the INGV is the operational center for seismic surveillance and earthquake monitoring in Italy and is a part of the civil protection system as a center of expertise on seismic, volcanic, and tsunami risks.INGV operates the Italian National Seismic Network and other networks at national scale and is a primary node of the European Integrated Data Archive for archiving and distributing strong-motion and weak-motion seismic recordings. In the control room in Rome, INGV staff performs seismic surveillance and tsunami warning services; in Catania and Naples, the control rooms are devoted to volcanic surveillance. Volcano monitoring includes locating earthquakes in the regions around the Sicilian (Etna, Eolian Islands, and Pantelleria) and the Campanian (Vesuvius, Campi Fregrei, and Ischia) active volcanoes. The tsunami warning is based on earthquake location...
Seismological Research Letters, 2019
Starting in 1988, with the installation of the first broadband (BB) instrument in Italy, the Medi... more Starting in 1988, with the installation of the first broadband (BB) instrument in Italy, the Mediterranean Very Broadband Seismographic Network (MedNet) program established a backbone network of BB stations of the highest quality in the Mediterranean Sea countries. The Mediterranean region is characterized by relevant and frequent seismicity related to its complex tectonics, due to the convergence of two major plates, Africa and Eurasia, and the involvement of other minor plates, as the Adriatic plate. Therefore, the MedNet project became a scientific research infrastructure of excellence, able to fill the gap of regional coverage when the availability of seismic BB instruments was still scarce. The main characteristics of the MedNet network are the highest quality of the seismographic instrumentation at remote sites and very low level of anthropogenic noise with stable conditions of pressure and temperature. After 30 yr of recordings, the MedNet program has proven that the early ad...