Figure: InSAR images used for area calculation of earthquakes related to normal faults - Figure: Figure: InSAR images used for area computation of normal faults-related earthquakesFrom the analysis of satellite images it is possible to recognize the areas with the greatest seismic intensity of an earthquake
Through the images obtained from satellite interferometry, a team of researchers from the Sapienza University of Rome and the National Institute of Geophysics and Volcanology (INGV) analyzed the "fingerprint" of earthquakes through the recognition of the deformation of the ground that accompanies a seismic event.
Scientists, in fact, have managed to accurately estimate the size and recognize the area where the most violent tremors that accompany earthquakes are concentrated. I study “The epicentral fingerprint of earthquakes marks the coseismically activated crustal volume” has just been published in 'Earth Science Reviews'.
The images obtained with the InSAR (Interferometric Synthetic Aperture Radar) technique allow to detect the cosismic deformation (i.e., the instantaneous and permanent deformation caused by the earthquake) by delimiting the epicentral area where the greatest displacement is concentrated, through the analysis of the deformation of the ground around the fault activated during an earthquake.
“In the research we analyzed 32 seismic events, with the aim of comparing the deformation fields in terms of shape, spatial extension and volumes of the earth's crust involved both by the mobilization and by the simultaneous crossing by seismic waves, and the corresponding type and earthquake magnitude explains Carlo Doglioni, President of INGV and Professor of Sapienza University. “The size of the deformed land surface area detected by InSAR for earthquakes with a magnitude equal to or greater than 6 is always greater than 100 km2, while it is also over 550 km2 for earthquakes with a magnitude of about 6.5. Additionally, comparison of InSAR to peak ground accelerations documents increased shaking within areas that experience greater vertical deformation..
"Since 1993, a long list of seismic events has been analyzed with InSAR data, ever growing thanks to the increase in the number of satellites, the improvement of the quality of SAR sensors, and the InSAR techniques in continental areas", say Patrizio Petricca, a researcher from Sapienza, and Christian Bignami from INGV. “With them it is possible to detect the cosismic deformation, delimiting the epicentral area where the greatest displacement is concentrated. Outside this area, apart from local amplification phenomena, the displacement of the ground decreases, determining the attenuation of the seismic shaking".
“Knowledge of these Earth manifestations helps to focus seismic prevention more specifically in future epicentral areas, helping to calibrate the seismic hazard assessment where vertical movement plays a relevant role in increasing more horizontal shaking and therefore more damage. Why earthquakes will come back: on average in Italy about 20 destructive earthquakes are generated per century", concludes the President Carlo Doglioni.
Link to the study
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The fingerprint of earthquakes identified with satellite interferometry
From the analysis of satellite images, the areas with the greatest seismic intensity of an earthquake are recognized
Through the images obtained by means of satellite interferometry technique, a team of researchers from the Sapienza University of Rome and the National Institute of Geophysics and Volcanology (INGV) analyzed the “fingerprint” of earthquakes through the recognition of the ground deformation that accompanies a seismic event. Scientists, in fact, have been able to estimate its dimensions and recognize the area where the most violent shaking accompanying earthquakes are concentrated. The study “The epicentral fingerprint of earthquakes marks the coseismically activated crustal volume” has just been published in 'Earth Science Reviews'.
The InSAR (Interferometric Synthetic Aperture Radar) data allow to detect the coseismic deformation (that is, the instantaneous and permanent deformation caused by the earthquake) delimiting the epicentral area where the greatest displacement is concentrated, through the analysis of the deformation of the ground around the fault activated during an earthquake.
“In the research we analyzed 32 seismic events, with the aim of comparing the deformation fields in terms of shape, spatial extension and volumes of the Earth's crust involved both by the mobilization and the simultaneous crossing by seismic waves, and the corresponding type and earthquake magnitude” explains Carlo Doglioni, President of INGV and Professor at Sapienza University. “The size of the deformed Earth's surface area detected by InSAR for earthquakes with a magnitude of 6 or greater is always greater than 100 km2, while it is also over 550km2 for earthquakes with a magnitude of about 6.5. Furthermore, the comparison between InSAR and the peak ground accelerations documents greater shaking within the areas that undergo greater vertical deformation”.
“Since 1993, with the images given by InSAR, a long list of seismic events has been analysed; this list is always growing thanks to the increase in the number of satellites and to the improvement of the quality of SAR sensors and InSAR techniques in continental areas”, the researchers Patrizio Petricca (Sapienza University) and Christian Bignami (INGV) state. “With them it is possible to detect the coseismic deformation, delimiting the epicentral area where most of the displacement is concentrated. Outside this area, apart from phenomena of local amplification, the ground displacement decreases, resulting in the attenuation of the seismic shaking”.
“Knowing these Earth manifestations helps to focus more specifically on seismic prevention in future epicentral areas, helping to calibrate the assessment of seismic hazard in which vertical movement plays a relevant role in increasing greater horizontal shaking and therefore greater damage. Earthquakes will return: on average, in Italy about 20 destructive earthquakes are generated per century”, concludes President Carlo Doglioni.
Link to the article
Through the images obtained from satellite interferometry, a team of researchers from the Sapienza University of Rome and the National Institute of Geophysics and Volcanology (INGV) analyzed the "fingerprint" of earthquakes through the recognition of the deformation of the ground that accompanies a seismic event.
Scientists, in fact, have managed to accurately estimate the size and recognize the area where the most violent tremors that accompany earthquakes are concentrated. I study “The epicentral fingerprint of earthquakes marks the coseismically activated crustal volume” has just been published in 'Earth Science Reviews'.
The images obtained with the InSAR (Interferometric Synthetic Aperture Radar) technique allow to detect the cosismic deformation (i.e., the instantaneous and permanent deformation caused by the earthquake) by delimiting the epicentral area where the greatest displacement is concentrated, through the analysis of the deformation of the ground around the fault activated during an earthquake.
“In the research we analyzed 32 seismic events, with the aim of comparing the deformation fields in terms of shape, spatial extension and volumes of the earth's crust involved both by the mobilization and by the simultaneous crossing by seismic waves, and the corresponding type and earthquake magnitude explains Carlo Doglioni, President of INGV and Professor of Sapienza University. “The size of the deformed land surface area detected by InSAR for earthquakes with a magnitude equal to or greater than 6 is always greater than 100 km2, while it is also over 550 km2 for earthquakes with a magnitude of about 6.5. Additionally, comparison of InSAR to peak ground accelerations documents increased shaking within areas that experience greater vertical deformation..
"Since 1993, a long list of seismic events has been analyzed with InSAR data, ever growing thanks to the increase in the number of satellites, the improvement of the quality of SAR sensors, and the InSAR techniques in continental areas", say Patrizio Petricca, a researcher from Sapienza, and Christian Bignami from INGV. “With them it is possible to detect the cosismic deformation, delimiting the epicentral area where the greatest displacement is concentrated. Outside this area, apart from local amplification phenomena, the displacement of the ground decreases, determining the attenuation of the seismic shaking".
“Knowledge of these Earth manifestations helps to focus seismic prevention more specifically in future epicentral areas, helping to calibrate the seismic hazard assessment where vertical movement plays a relevant role in increasing more horizontal shaking and therefore more damage. Why earthquakes will come back: on average in Italy about 20 destructive earthquakes are generated per century", concludes the President Carlo Doglioni.
Link to the study
---
The fingerprint of earthquakes identified with satellite interferometry
From the analysis of satellite images, the areas with the greatest seismic intensity of an earthquake are recognized
Through the images obtained by means of satellite interferometry technique, a team of researchers from the Sapienza University of Rome and the National Institute of Geophysics and Volcanology (INGV) analyzed the “fingerprint” of earthquakes through the recognition of the ground deformation that accompanies a seismic event. Scientists, in fact, have been able to estimate its dimensions and recognize the area where the most violent shaking accompanying earthquakes are concentrated. The study “The epicentral fingerprint of earthquakes marks the coseismically activated crustal volume” has just been published in 'Earth Science Reviews'.
The InSAR (Interferometric Synthetic Aperture Radar) data allow to detect the coseismic deformation (that is, the instantaneous and permanent deformation caused by the earthquake) delimiting the epicentral area where the greatest displacement is concentrated, through the analysis of the deformation of the ground around the fault activated during an earthquake.
“In the research we analyzed 32 seismic events, with the aim of comparing the deformation fields in terms of shape, spatial extension and volumes of the Earth's crust involved both by the mobilization and the simultaneous crossing by seismic waves, and the corresponding type and earthquake magnitude” explains Carlo Doglioni, President of INGV and Professor at Sapienza University. “The size of the deformed Earth's surface area detected by InSAR for earthquakes with a magnitude of 6 or greater is always greater than 100 km2, while it is also over 550km2 for earthquakes with a magnitude of about 6.5. Furthermore, the comparison between InSAR and the peak ground accelerations documents greater shaking within the areas that undergo greater vertical deformation”.
“Since 1993, with the images given by InSAR, a long list of seismic events has been analysed; this list is always growing thanks to the increase in the number of satellites and to the improvement of the quality of SAR sensors and InSAR techniques in continental areas”, the researchers Patrizio Petricca (Sapienza University) and Christian Bignami (INGV) state. “With them it is possible to detect the coseismic deformation, delimiting the epicentral area where most of the displacement is concentrated. Outside this area, apart from phenomena of local amplification, the ground displacement decreases, resulting in the attenuation of the seismic shaking”.
“Knowing these Earth manifestations helps to focus more specifically on seismic prevention in future epicentral areas, helping to calibrate the assessment of seismic hazard in which vertical movement plays a relevant role in increasing greater horizontal shaking and therefore greater damage. Earthquakes will return: on average, in Italy about 20 destructive earthquakes are generated per century”, concludes President Carlo Doglioni.
Link to the article