IASPEI - Picture Gallery
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS003 Oral Presentation 1874 The potential for Earthquake Early Warning using ElarmS in Italy Mr. Marco Olivieri CNT, INGV INGV Richard M. Allen, Gilead Wurman The new INSN (Italian National Seismic Network) is a dense network of broadband stations deployed for monitoring Italian seismicity. The network consists of 250 stations with a typical station spacing of ~40 km. Earthquake early warning is the rapid detection of an event in progress, assessment of the hazard it poses, and transmission of a warning ahead of any significant ground motion. We explore the potential for using the INSN real-time network for the purpose of earthquake early warning. We run the ElarmS early warning methodology off-line using a data set of more than 200 events with magnitude between 2.5 and 6.0. A scaling relation for magnitude determination from the dominant period of the first seconds of signal following the P-onset is developed from the dataset. The standard deviation in the magnitude estimates using this approach is 0.4 magnitude units and all event magnitude estimates are within 0.75 magnitude units of the true magnitude. Given the existing distribution of seismic stations it takes an average of 10 sec after event initiation before the P-wave has been detected at 4 stations. If we require a detection at 4 stations before issuing the first alert then the blind zone, within which no warning would be available, has a radius of ~37 km. The ElarmS methodology can provide a warning earlier than this but with a greater uncertainty. An assessment of past damaging earthquakes across Italy shows that applying ElarmS with the existing seismic network could provide warning to population centers in repeats of past events. For example, in a repeat of the 1980 Irpinia earthquake Naples could receive ~15 sec warning. The variations in the size of the blind zone and warning times for different regions can be used as a guide to selecting strategic locations for future station deployments. Keywords: italy, eartquake, monitoring
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS003 Oral Presentation 1875 Rapid ground-shaking map computation for early-warning applications Dr. Vincenzo Convertito Osservatorio Vesuviano Istituto Nazionale di Geofisica e Vulcanologia IASPEI De Matteis Raffaella, Zollo Aldo, Cantore Luciana, Iannaccone Giovanni Rapid assessment of strong ground-shaking maps after a moderate-to-large earthquake is crucial to identify most probable damaged areas. For rapid response, this is fundamental for directing first-aid emergency rescues, for loss estimation and the planning of emergency actions. Ground-shaking maps are computed by integrating and interpolating both recorded and predicted data. As a consequence, key elements in computing ground-shaking maps are the tool used to predict selected ground motion parameter (e.g., Pga, Pgv, Sa(T)) and the adopted gridding and interpolation techniques. These elements are crucial particularly in the areas not covered by the seismic network. We propose a procedure for rapid computation of ground-shaking maps for moderate-to-large earthquakes. The procedure uses a new interpolation technique based on the triangulation of the region of interest by selecting regional attenuation relationships for ground motion predictions. The proposed method allows to account for earthquake specific effects, such as rupture extension, radiation pattern and directivity integrating the recorded and estimated ground motion values. The method is tested off-line on a set of earthquakes and the results are compared with those obtained by using the software ShakeMap. From one side, the comparison is devoted to outline the main differences between the different interpolation and gridding techniques. On the other hand, the same comparison allows to emphasize the use of regional attenuation relationships particularly for low magnitude earthquakes. Keywords: ground shaking map, attenuation relationships, near real time
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS003 Oral Presentation 1875<br />
Rapid ground-shaking map computation for early-warning applications<br />
Dr. Vincenzo Convertito<br />
Osservatorio Vesuviano Istituto Nazionale di Geofisica e Vulcanologia <strong>IASPEI</strong><br />
De Matteis Raffaella, Zollo Aldo, Cantore Luciana, Iannaccone Giovanni<br />
Rapid assessment of strong ground-shaking maps after a moderate-to-large earthquake is crucial to<br />
identify most probable damaged areas. For rapid response, this is fundamental for directing first-aid<br />
emergency rescues, for loss estimation and the planning of emergency actions. Ground-shaking maps<br />
are computed by integrating and interpolating both recorded and predicted data. As a consequence, key<br />
elements in computing ground-shaking maps are the tool used to predict selected ground motion<br />
parameter (e.g., Pga, Pgv, Sa(T)) and the adopted gridding and interpolation techniques. These<br />
elements are crucial particularly in the areas not covered by the seismic network. We propose a<br />
procedure for rapid computation of ground-shaking maps for moderate-to-large earthquakes. The<br />
procedure uses a new interpolation technique based on the triangulation of the region of interest by<br />
selecting regional attenuation relationships for ground motion predictions. The proposed method allows<br />
to account for earthquake specific effects, such as rupture extension, radiation pattern and directivity<br />
integrating the recorded and estimated ground motion values. The method is tested off-line on a set of<br />
earthquakes and the results are compared with those obtained by using the software ShakeMap. From<br />
one side, the comparison is devoted to outline the main differences between the different interpolation<br />
and gridding techniques. On the other hand, the same comparison allows to emphasize the use of<br />
regional attenuation relationships particularly for low magnitude earthquakes.<br />
Keywords: ground shaking map, attenuation relationships, near real time
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