Optimal, real-time earthquake location for early ... - Anthony Lomax
Destructive S and surface waves from a large earthquake can take several tens of sec- onds to travel from the earthquake source region to distant populated ...
Optimal, real-time earthquake location for early warning C. Satriano (1), A. Lomax (2) and A. Zollo (1) (1) RISSC-Lab, Dipartimento di Scienze Fisiche, Università di Napoli Federico II, (2) Anthony Lomax Scientific Software, Mouans-Sartoux, France
Destructive S and surface waves from a large earthquake can take several tens of seconds to travel from the earthquake source region to distant populated areas and sensitive infrastructure. If there is a seismological monitoring network in the source region, modern seismological analysis methods and communications systems allow characterization of the event and the issuing of alarm messages within seconds, leaving tens of seconds for mitigating actions to be taken. This procedure is known as early warning. For example, for an earthquake in the Irpinia region of Southern Italy there is a delay of about 25-30 sec before the first energetic S wave trains arrive at Naples at about 80-100 km distance. With an early warning system, alarm messages could be sent to critical sites in Naples 20 or more seconds before strong shaking commences. The characterization of an earthquake includes, most importantly, estimates of its location and size. Here we are concerned with obtaining the most constraint possible on the location of the event hypocenter as time passes after event detection. We developed an evolutionary, real-time location technique, based on the equal differential time (EDT) formulation and on a probabilistic approach for hypocenter estimation. The algorithm, at each time step, relies on the information coming from triggered arrivals and not yet triggered station. With just one recorded arrival, hypocentral position can be constrained by the Voronoi cell associated to the first triggering station. As time passes and more triggers become available, the evolutionary location converges to a standard EDT location. We performed synthetic location tests using the actual geometry of the ISNet (Irpinia Seismic Network) in order to evaluate the accuracy of the algorithm and its robustness
Traditional earthquake location based on Geiger's method generally consists of linearized inversion of individual arrival time picks using layered seismic velocity ...
Tsunami early warning using earthquake rupture duration ... 3-10 min after the earthquake occurs, depending on station density, and that it correctly identifies ...
Dec 6, 2010 - seismograms at 10-30º GCD to rapidly determine if T0 for an ... For a measure of tsunami size, we calculate a representative tsunami wave ...
Though rupture on a fault during an earthquake is not a point process, it is convenient and important to estimate a point location for the initiation of rupture.
data are a set of arrival times, t, and a theoretical relation gives predicted ...... since the shear stress orientations near the discontinuity strongly depend on its ...
Aug 31, 2010 - J. Int., 176(1), 200â214, doi:10.1111/ j.1365-246X.2008.03974.x. Lomax, A., and A. Michelini (2009b), Tsunami early warning using earthquake ...
May 24, 2005 - of energy from the kinetic energy of the ring to magnetic energy. ... good effect in the teaching of freshman elec- tromagnetism at ... transference.
Mar 11, 2011 - INGV Earthquake Monitor are shown in the following slides. This work was supported by the 2007-2009 Dipartimento della Protezione Civile ...
Global-search methods for seismic event location produce comprehensive uncertainty information and can easily be used with 3D velocity models. The global- ...
Designed and implemented interactive, graphical applications for processing, analysis, simulation, display ... SELECTED PRODUCTS. â¢. Early-est: A lightweight ...
events, the effect of the crust on CM is introduced as a magnitude correction using the ..... which reduces the radiated kinetic energy while maintaining the seismic energy balance. ... Quick Estimator of the Size of Great Earthquakes, Eos Trans.
random walk, see Mosegaard and Tarantola, 1995; Lomax et al., 2000; Lomax et al., 2009), which tests a large number of .... Users Guide. 2017-08-13 - 5/6 ...
Earthquake Rapid Location sYstem with Estimation of Tsunamigenesis early-est.alomax.net earthquake location â seismic, micro- seismic and hydro-acoustic ...
synthetics indicate that (1) horizontal bending and focusing of. SH waves by the lateral crustal velocity contrast across the San. Andreas fault and (2) the source ...
Here we examine the current and potential future contributions of seismic networks and analysis proce- dures to tsunami early warning in the Mediterranean ...
This paper introduces a new, efficient method for approximating broad-band wave propagation in ... Full-waveform methods are efficient and accurate because.
(2013), The French Tsunami Warning Center for the Mediterranean and Northeast Atlantic: CENALT, Tsunami Soc. Int. 32. The current and future state of seismic ...
O. K. 73%. OK. Tsunamigenic earthquakes: the TdâT0 discriminant. T. T d. âT. 0 discriminant â OT+5-10m. M w. CMT â OT+20m+. TdT0=510s2. âtsunami ...
May 22, 2012 - time within the Early-est software and earthquake monitor at INGV-Rome ..... offshore tsunami data from the 2011 off the Pacific coast of Tohoku ...
Regional, teleseismic and historical event locations are often plagued by poor station distribution, and by outliers in the data due to timing errors, phase miss- ...
