Time filter

Source Type

Napoli, Italy

Picozzi M.,University of Naples Federico II | Colombelli S.,University of Naples Federico II | Colombelli S.,RISSC Laboratory | Zollo A.,University of Naples Federico II | And 2 more authors.
Pure and Applied Geophysics | Year: 2015

The south of the Iberian Peninsula is situated at the convergence of the Eurasian and African plates. This region experiences large earthquakes with long separation in time, the best known of which was the great 1755 Lisbon Earthquake, which occurred SW of San Vicente Cape (SW Iberian Peninsula). The high risk of damaging earthquakes has recently led Carranzaet al. (Geophys. Res. Lett. 40, 2013) to investigate the feasibility of an EEWS in this region. Analysis of the geometry for the Iberian seismic networks and the San Vicente Cape area led the authors to conclude that a threshold-based approach, which would not require real-time location of the earthquake, might be the best option for an EEWS in SW Iberia. In this work we investigate this hypothesis and propose a new EEW approach that extends standard P-wave threshold-based single-station analysis to the whole network. The proposed method enables real-time estimation of the potential damage at stations that are triggered by P-waves and those which are not triggered, with the advantage of greater lead-times for release of alerts. Results of tests made with synthetic data mimicking the scenario of the great 1755 Lisbon Earthquake, and those conducted by applying the new approach to available recordings, indicate that an EEW estimation of the potential damage associated with an event in the San Vicente Cape area can be obtained for a very large part of the Iberian Peninsula. © 2014, Springer Basel.

Satriano C.,RISSC Laboratory | Satriano C.,University of Naples Federico II | Wu Y.-M.,National Taiwan University | Zollo A.,University of Naples Federico II | Kanamori H.,California Institute of Technology
Soil Dynamics and Earthquake Engineering | Year: 2011

Modern technology allows real-time seismic monitoring facilities to evolve into earthquake early warning (EEW) systems, capable of reducing deaths, injuries, and economic losses, as well as of speeding up rescue response and damage recovery. The objective of an EEW system is to estimate in a fast and reliable way the earthquake's damage potential, before the strong shaking hits a given target. The necessary framework for EEW implementation is provided by the observed relationships between different parameters measured on the signal onsets and the final earthquake size. The implication of these observations on the physics of fracture processes has given rise to a significant debate in the seismological community. Currently, EEW systems are implemented or under testing in many countries of the world, and different methodologies and procedures have been studied and developed. The leading experience of countries like Japan or Mexico shows that, with a proper education of population and end-users, and with the design of real-time systems for the reduction of vulnerability/exposure, EEW can be an effective approach to the mitigation of the seismic risk at short time-scales. © 2010 Elsevier Ltd.

Satriano C.,RISSC Laboratory | Satriano C.,University of Naples Federico II | Elia L.,RISSC Laboratory | Elia L.,University of Naples Federico II | And 5 more authors.
Soil Dynamics and Earthquake Engineering | Year: 2011

PRESTo (PRobabilistic and Evolutionary early warning SysTem) is a software platform for regional earthquake early warning that integrates recently developed algorithms for real-time earthquake location and magnitude estimation into a highly configurable and easily portable package. The system is under active experimentation in Southern Italy on the Irpinia Seismic Network (ISNet), which is deployed in a seismogenic area that is expected to produce a large earthquake within the next 20 years. In this paper we describe the architecture of the system and test its performances using both small earthquakes (M<3.5) recorded at the ISNet and a large event recorded in Japan, through a simulation mode. The results show that, when a dense seismic network is deployed in the fault area, PRESTo can produce reliable estimates of earthquake location and size within 5-6 s from the event origin. Each estimate is provided as a probability density function, with an uncertainty that typically decreases with time: a stable solution is generally reached within 10 s from the origin. Thanks to its fully probabilistic approach, PRESTo can be a powerful tool for end-users in addressing the trade-off problem of whether and when to initiate safety measures. The software makes use of widespread standards for real-time data input and output, and can be finely tuned to easily adapt it to different networks and seismogenic regions. © 2010 Elsevier Ltd.

Picozzi M.,University of Naples Federico II | Zollo A.,University of Naples Federico II | Brondi P.,University of Naples Federico II | Colombelli S.,University of Naples Federico II | And 5 more authors.
Journal of Geophysical Research B: Solid Earth | Year: 2015

When accompanied by appropriate training and preparedness of a population, Earthquake Early Warning Systems (EEWS) are effective and viable tools for the real-time reduction of societal exposure to seismic events in metropolitan areas. The Italian Accelerometric Network, RAN, which consists of about 500 stations installed over all the active seismic zones, as well as many cities and strategic infrastructures in Italy, has the potential to serve as a nationwide early warning system. In this work, we present a feasibility study for a nationwide EEWS in Italy obtained by the integration of the RAN and the software platform PRobabilistic and Evolutionary early warning SysTem (PRESTo). The performance of the RAN-PRESTo EEWS is first assessed by testing it on real strong motion recordings of 40 of the largest earthquakes that have occurred during the last 10 years in Italy. Furthermore, we extend the analysis to regions that did not experience earthquakes by considering a nationwide grid of synthetic sources capable of generating Gutenberg-Richter sequences corresponding to the one adopted by the seismic hazard map of the Italian territory. Our results indicate that the RAN-PRESTo EEWS could theoretically provide for higher seismic hazard areas reliable alert messages within about 5 to 10s and maximum lead times of about 25s. In case of large events (M>6.5), this amount of lead time would be sufficient for taking basic protective measures (e.g., duck and cover, move away from windows or equipment) in tens to hundreds of municipalities affected by large ground shaking. Key Points The feasibility of a nationwide EEWS in Italy is for the first time assessed The analysis is extended also to regions that did not experience earthquakes Higher seismic hazard areas could benefit from lead times of about 25 s ©2015. American Geophysical Union. All Rights Reserved.

Discover hidden collaborations