- I am a geophysicist with a primary research interest in earthquake seismology. I work at developing new ideas, method... moreI am a geophysicist with a primary research interest in earthquake seismology. I work at developing new ideas, methods and technologies to promptly detect earthquakes, characterize their strength and fast alerting on potential strong shaking and damage. In a nutshell : earthquake early warningedit
The Mw 6.3 Central Italy (L'Aquila) earthquake on April 6, 2009 has been recorded by the Irpinia Seismic Network (ISNet) about 250 km SE of the epicenter. The ISNet array has an aperture of about 80 km and consists of 25 stations,... more
The Mw 6.3 Central Italy (L'Aquila) earthquake on April 6, 2009 has been recorded by the Irpinia Seismic Network (ISNet) about 250 km SE of the epicenter. The ISNet array has an aperture of about 80 km and consists of 25 stations, each equipped with a 3C CMG-5T accelerometer. Waveforms from 19 stations could be used to estimate rupture geometry, event magnitude, and moment tensor. The recorded, low-pass filtered waveforms (f<2 Hz) are very coherent and permit the application of array methods to measure backazimuth and slowness of the incoming waves for subsequent event location. To image the rupture geometry we implemented a modified beamforming and stacking technique that back-projects the recorded direct P-wave amplitudes into the earthquake source region using travel times from a 1D velocity model. Amplitudes were measured in a 0.5 s moving time window until the arrival of secondary phases. A NW-SE striking rupture of 17 km length is imaged, propagating with an average vel...
The Mw 9.0 megathrust earthquake off northeastern Honshu, Japan, in March 2011 had an unexpected size for a region which experienced only few events with magnitude larger than 8.0 in the past millennium. The event originated at crustal... more
The Mw 9.0 megathrust earthquake off northeastern Honshu, Japan, in March 2011 had an unexpected size for a region which experienced only few events with magnitude larger than 8.0 in the past millennium. The event originated at crustal depths along a segment of the Pacific slab of the Japanese subduction zone. Large slip deficit and strong interplate coupling have been previously detected there by inland deformation measurements. The pattern of seismicity occurrence and the mechanical coupling between the different sectors of the Japan slab suggest that its morphology and segmentation may be strongly influenced by the presence of landward oceanic fracture zones. The aim of this study is to image the locations of strongly radiating sources and the rupture development during the faulting process. We used strong-motion records from the dense Japanese accelerometer arrays, integrated twice to obtain ground displacement, and filtered in different frequency bands between 0.04 Hz and 2.0 H...
The S.Vicente Cape (SW Iberia) is a region where potential large and damaging earthquakes may occur, such as the 1755 Lisbon (Imax=X) or 1969 S. Vicente Cape (Ms=8,1) events. In order to study the feasibility of an Earthquake Early... more
The S.Vicente Cape (SW Iberia) is a region where potential large and damaging earthquakes may occur, such as the 1755 Lisbon (Imax=X) or 1969 S. Vicente Cape (Ms=8,1) events. In order to study the feasibility of an Earthquake Early Warning System (EEWS) for earthquakes on this region (ALERT-ES project), we have estimated the Pd and τc parameters for a rapid estimation of the magnitude from the first seconds of the beginning of P-waves. We have selected earthquakes occurred on the period 2006-2011 with magnitude larger than 3.8 and recorded at regional distances (less than 500 km) at real time broad-band seismic stations of Instituto Geográfico Nacional , Western Mediterranean and Portuguese National Networks. We have studied time-windows from 2 to 4s and applied different filters. Due to the off-shore focus occurrence and very bad azimuthal coverage, we have corrected the Pd parameter by the radiation pattern obtained from focal mechanisms of the largest earthquakes of this region. ...
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The Submerged Floating Tunnel is an innovative solution for waterway crossings, consisting in a tubular structure floating underwater and fixed in position by means of tensioned anchorages linked to the seabed. SFTs seem to be... more
The Submerged Floating Tunnel is an innovative solution for waterway crossings, consisting in a tubular structure floating underwater and fixed in position by means of tensioned anchorages linked to the seabed. SFTs seem to be particularly suitable to cross waterways located in high seismicity zones, due to their large transversal flexibility and to the additional damping and inertia arising from the waterstructure interaction. The seismic behaviour of SFTs features peculiar aspects that deserve to be studied, such as the influence of the asynchronous ground motion and of the propagation of vertical ground motion in the upper water layer. In order to investigate the structural response and performance of SFTs during an exceptionally severe earthquake, the 1908 Messina (Italy) earthquake is simulated, generating acceleration and velocity time histories in the ground and in the water layer. An extensive campaign of F.E. analyses is carried out, considering several structural configura...
The advent of digital recording of seismic signals has greatly improved the capability to study the details of earthquake processes. This is mainly due to the large dynamic range of digital instruments allowing high quality recording of... more
The advent of digital recording of seismic signals has greatly improved the capability to study the details of earthquake processes. This is mainly due to the large dynamic range of digital instruments allowing high quality recording of ground motion over a wide amplitude interval. Consequently, a new generation of techniques applied to time and frequency domain digital data has been developed which have the objective to increase the resolution on the estimate of source and medium parameters.
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... FOR THE 1980 IRPINIA EARTHQUAKE, M=6.9, SOUTHERN ITALY VINCENZO CONVERTITO,ANTONIO EMOLO, FRANTISEK GALLOVIC, AND ALDO ZOLLO ... (1) ( ) ( ) ò D+ ³ a= ³ 2 0 0 m m m a M c c dm*r,mA *r,mApmf AAE The technique developed by Convertito et... more
... FOR THE 1980 IRPINIA EARTHQUAKE, M=6.9, SOUTHERN ITALY VINCENZO CONVERTITO,ANTONIO EMOLO, FRANTISEK GALLOVIC, AND ALDO ZOLLO ... (1) ( ) ( ) ò D+ ³ a= ³ 2 0 0 m m m a M c c dm*r,mA *r,mApmf AAE The technique developed by Convertito et al. ...
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The effect of induced seismicity of geothermal systems during stimulation and fluid circulation can cover a wide range of values from light and unfelt to severe and damaging. If the design of a modern geothermal system requires the... more
The effect of induced seismicity of geothermal systems during stimulation and fluid circulation can cover a wide range of values from light and unfelt to severe and damaging. If the design of a modern geothermal system requires the largest efficiency to be obtained from the social point of view it is required that the system could be managed in order to reduce possible impact in advance. In this framework, automatic control of the seismic response of the stimulated reservoir is nowadays mandatory, particularly in proximity of ...
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RISS S.r.l. is a Spin-off company recently born from the initiative of the research group constituting the Seismology Laboratory of the Department of Physics of the University of Naples Federico II. RISS is an innovative start-up, based... more
RISS S.r.l. is a Spin-off company recently born from the initiative of the research group constituting the Seismology Laboratory of the Department of Physics of the University of Naples Federico II. RISS is an innovative start-up, based on the decade-long experience in earthquake monitoring systems and seismic data analysis of its members and has the major goal to transform the most recent innovations of the scientific research into technological products and prototypes. With this aim, RISS has recently started the development of a new software, which is an elegant solution to manage and analyse seismic data and to create automatic earthquake bulletins. The software has been initially developed to manage data recorded at the ISNet network (Irpinia Seismic Network), which is a network of seismic stations deployed in Southern Apennines along the active fault system responsible for the 1980, November 23, MS 6.9 Irpinia earthquake. The software, however, is fully exportable and can be u...
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... The inversion showed a high-velocity region beneath Mount Vesuvius (Fig. ... slower (VP 3.4 to 3.8 km/s) and shallower high-velocity zone extends laterally from Gran Cono to the northern rim of ... It has a greater thickness on the... more
... The inversion showed a high-velocity region beneath Mount Vesuvius (Fig. ... slower (VP 3.4 to 3.8 km/s) and shallower high-velocity zone extends laterally from Gran Cono to the northern rim of ... It has a greater thickness on the southeast slope where there are more lateral vents. ...
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The seismic activity that occurred at the Phlegraean Fields (Southern Italy) volcanic area during a pronounced episode of ground uplift has been analysed. One hundred and eighty-one three component seismograms from a digital network... more
The seismic activity that occurred at the Phlegraean Fields (Southern Italy) volcanic area during a pronounced episode of ground uplift has been analysed. One hundred and eighty-one three component seismograms from a digital network operating in the period JanuaryMay ...
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Research Interests: Management, Psychology, Geology, Radiation, Seismic Hazard, and 14 moreNatural Hazards, Seismology, Emergency Management, Planning, Triangulation, Atmospheric sciences, Seismic Risk, Ground Motion, Attenuation, Focal Mechanism, Radiation Pattern, Earthquake Location, Data Grid, and Emergency service
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Research Interests: Engineering, Earth Sciences, Computer Science, Algorithms, Theory, and 15 moreWavelet, High Frequency, Computers, Fortran, Frequency, Ray Tracing, Selection Criteria, Time Frequency Analysis, Automatic code generation, Data Processing, Amplitude, Continuous wavelet transform, Ray Theory, Seismogram, and Synthetic seismogram
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ABSTRACT Rapid evaluation of strong ground-shaking maps after moderate-to-large earthquakes is crucial to recognizing those areas where the largest damage and losses are expected. These maps play a fundamental role for emergency... more
ABSTRACT Rapid evaluation of strong ground-shaking maps after moderate-to-large earthquakes is crucial to recognizing those areas where the largest damage and losses are expected. These maps play a fundamental role for emergency management. This is particularly important for areas having high seismic risk potential and covered by dense seismic networks. In near-real-time applications, ground-shaking maps are produced by integrating recorded data and estimates obtained by using ground-motion predictive equations, which assume point-source models. However, particularly for large earthquakes, improvements in the predictions of the peak ground motion can be obtained when fault extension and orientation are available. In fact, detailed source information allows one to use a more robust source-to-site distance metric compared with hypocentral distance. In this paper, a technique for estimating both fault extent (in terms of its surface projection) and dominant rupture direction is presented. This technique can be used in near-real-time ground-motion map calculation codes with the aim of improving ground-motion estimates with respect to a point-source model. The model parameters are estimated by maximizing a probability density function based on the residuals between observed and predicted peak-ground-motion quantities, the latter obtained by using predictive equations. The model space to be investigated is defined through a Bayesian approach, and it is explored by a grid-searching technique. The effectiveness of the proposed technique is demonstrated by offline numerical tests using data from three earthquakes occurring in different seismotectonic environments. The selected earthquakes are the 17 August 1999 M-w 7.5 Kocaeli (Turkey) earthquake, the 6 April 2009 M-w 6.3 L&#39;Aquila (Italy) earthquake, and the 17 January 1994 M-w 6.7 Northridge (California) earthquake. The obtained results show that the proposed technique allows for fast and first order estimates of the fault extent and dominant rupture direction, which could be used to improve ground-shaking map calculations.
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Research Interests: Civil Engineering, Geology, Hydrogeology, Real Time Computing, Data Analysis, and 12 moreWarning System, Data Communication, Data Collection, Earthquake early warning systems, Real Time, Ground Motion, High Density Concrete, Active Fault, Earthquake Location, Quality of data, Software Package, and High density
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Probabilistic Seismic Hazard Analysis (PSHA) is still a standard approach to com- pute seismic hazard maps in different countries. This approach depends mainly on the definition of the seismogenetic zones and the type of attenuation laws.... more
Probabilistic Seismic Hazard Analysis (PSHA) is still a standard approach to com- pute seismic hazard maps in different countries. This approach depends mainly on the definition of the seismogenetic zones and the type of attenuation laws. Attenua- tion laws relates a strong ground motion parameter (e.g. Peak Ground Acceleration) with basic parameter functions such as the magnitude, a source-site distance
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The rapid evaluation of strong ground shaking maps after a moderate to large earthquake is crucial to recognize the areas where the largest damages and losses are expected. These maps play a fundamental role for orienting first aid... more
The rapid evaluation of strong ground shaking maps after a moderate to large earthquake is crucial to recognize the areas where the largest damages and losses are expected. These maps play a fundamental role for orienting first aid emergency rescues, for loss estimation and the planning of emergency actions. This is particularly important for areas having high seismic risk potential
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A prototype system for earthquake early warning and rapid shake map evaluation is being developed and tested in southern Italy based on a dense, wide dynamic-range seismic network (accelerometers+ seismometers) under installation in the... more
A prototype system for earthquake early warning and rapid shake map evaluation is being developed and tested in southern Italy based on a dense, wide dynamic-range seismic network (accelerometers+ seismometers) under installation in the Apenninic belt region (Irpinia Seismic Network). This system forms a regional Earthquake Early Warning System consisting of a seismic sensor network covering a portion of the expected epicentral area for large earrthquakes. Considering a warning window ranging from tens of seconds ...
Research Interests: Geology, Seismology, Early Warning, Early Warning System, Data acquisition, and 14 moreTime Delay, Earthquake early warning systems, Sensor Network, Real Time, Travel Time, Magnitude Estimation, Ground Motion, Evolutionary Strategy, Probability Density Function, Public Infrastructure, Earthquake Location, Shake, Probabilistic Approach, and Time window
Simplified one-dimensional velocity models are generally used both for monitoring and for research purposes in geologically complex seismogenic areas. In these situations the use of 1D models to represent the true threedimensional... more
Simplified one-dimensional velocity models are generally used both for monitoring and for research purposes in geologically complex seismogenic areas. In these situations the use of 1D models to represent the true threedimensional velocity distribution can lead to systematic errors in the estimated earthquake locations and focal mechanisms. This is the case of Campania-Lucania region (Southern Italy) where the geological and geophysical knowledge reveal a significant lateral variation of the elastic properties of the medium. The ...
The Mw 6.3 Central Italy (L'Aquila) earthquake on April 6, 2009 has been recorded by the Irpinia Seismic Network (ISNet) about 250 km SE of the epicenter. The ISNet array has an aperture of about 80 km and consists of 25 stations,... more
The Mw 6.3 Central Italy (L'Aquila) earthquake on April 6, 2009 has been recorded by the Irpinia Seismic Network (ISNet) about 250 km SE of the epicenter. The ISNet array has an aperture of about 80 km and consists of 25 stations, each equipped with a 3C CMG-5T accelerometer. Waveforms from 19 stations could be used to estimate rupture geometry, event magnitude, and moment tensor. The recorded, low-pass filtered waveforms (f< 2 Hz) are very coherent and permit the application of array methods to measure backazimuth ...
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Campi Flegrei is one of the main unrest calderas in the world. Several hundred thousansd people live within its borders. This makes very high the volcanic risk associated even to a minor eruption. The caldera formed as a consequence of a... more
Campi Flegrei is one of the main unrest calderas in the world. Several hundred thousansd people live within its borders. This makes very high the volcanic risk associated even to a minor eruption. The caldera formed as a consequence of a huge ignimbrite eruption around 40000 year b.p. In the last ten thousand years, the volcanic activity has been characterized
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Education and awardness on sciences and on natural phenomena is a concern of both researchers teachers with many social issues. A well-defined frame is critical for interaction and collaboration and should be illustrated on key examples.... more
Education and awardness on sciences and on natural phenomena is a concern of both researchers teachers with many social issues. A well-defined frame is critical for interaction and collaboration and should be illustrated on key examples. Observing and analysing seismic data is one of these examples because earthquakes with strong implications in our industrial society attract young people and because
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We examine here a number of parameters that define the source of the earthquake that occurred on 23rd July 1930 in Southern Italy (in the Irpinia region). Starting from the source models proposed in different studies, we have simulated... more
We examine here a number of parameters that define the source of the earthquake that occurred on 23rd July 1930 in Southern Italy (in the Irpinia region). Starting from the source models proposed in different studies, we have simulated the acceleration field for each hypothesized model, and compared it with the macroseismic data. We then used the hybrid stochastic-deterministic technique proposed by Zollo et al. (1997) for the simulation of the ground motion associated with the rupture of an extended fault. The accelerations simulated for several sites were associated with the intensities using the empirical relationship proposed by Trifunac and Brady (1975), before being compared with the available data from the macroseismic catalogue. A good reproduction of the macroseismic field is provided by a normal fault striking in Apenninic direction (approximately NW-SE) and dipping 55° toward the SW.
The records of an aftershock (M ~ 4) of a moderate size event (M = 5.9) which occurred along the subduction zone of Guerrero (Mexico), are used as empirical Green functions (EGF) to determine the source characteristics of the mainshock... more
The records of an aftershock (M ~ 4) of a moderate size event (M = 5.9) which occurred along the subduction zone of Guerrero (Mexico), are used as empirical Green functions (EGF) to determine the source characteristics of the mainshock and of its smaller size (M = 5.5) foreshock. The data consist of accelerograms recorded by the Guerrero Accelerograph Array, a high dynamic range strong motion array. The three events appear to be located close to each other at distances much smaller than the source to receiver distances. The fault mechanism of the mainshock is computed by non-linear inversion of P polarity readings and S wave polarizations determined at two near source stations. The foreshock and aftershock fault mechanisms are similar to that of the mainshock as inferred from long period data and shear wave polarization analysis. The maximum likelihood solution is well constrained, indicating a typical shallow dipping thrust fault mechanism, with the P-axis approximately oriented in...
After the seismic events occurred in Emilia (Italy) on May 20 and May 29, 2012, the International Commission on Hydrocarbon Exploration and Seismicity in the Emilia Region (ICHESE) evaluated the possible links between E&P activities and... more
After the seismic events occurred in Emilia (Italy) on May 20 and May 29, 2012, the International Commission on Hydrocarbon Exploration and Seismicity in the Emilia Region (ICHESE) evaluated the possible links between E&P activities and the seismic activity in the area affected by the earthquakes. The Commission could not rule out the possibility of a link and emphasized the need of further analyses, in order to exclude the correlation of seismic events of May 2012 to waste-water injection activities performed at the Cavone field. The Ministry of Economic Development (MiSE), the EmiliaRomagna Region and the Operator with the patronage of Assomineraria i carried out such analyses and found new elements against the possibility that operations could affect the seismic events. Furthermore, the Commission recommended developing new integrated monitoring systems for seismicity, ground deformations and pore pressures that were able to provide high-quality data in real time, in order to sup...
The past two decades have witnessed a huge progress in the development, implementation and testing of Earthquakes Early Warning Systems (EEWS) worldwide, as the result of a joint effort of the seismological and earthquake engineering... more
The past two decades have witnessed a huge progress in the development, implementation and testing of Earthquakes Early Warning Systems (EEWS) worldwide, as the result of a joint effort of the seismological and earthquake engineering communities to set up robust and efficient methodologies for the real-time seismic risk mitigation. This work presents an overview of the worldwide applications of the system PRESTo (PRobabilistic and Evolutionary early warning SysTem), which is the highly configurable and easily portable platform for Earthquake Early Warning developed by the RISSCLab group of the University of Naples Federico II.