196,103 research outputs found
Earthquake magnitude estimation from early radiated energy
No full textFrom inspection of a large set of Japanese events, we
investigate the scaling of the early radiated energy, inferred
from the squared velocity integral (IV2) with the final
magnitude of the event. We found that the energy can only
discriminate whether the event has a magnitude larger or
smaller than 5.8, and in the latter case it can allow for realtime
magnitude estimation. However, by normalizing IV2
for the rupture area, the initial slip scales with the magnitude
between 4 < M < 7 following the expected scaling laws. We
show that the ratio between the squared peak displacement
and IV2 is a proxy for the slip following the same scaling
but it can be directly derived from the data, without any
assumption on the rupture area. The scaling relationship
between initial slip and magnitude can be used for early
warning applications, when integrated in a probabilistic,
evolutionary approach. Citation: Festa, G., A. Zollo, and M.
Lancieri (2008), Earthquake magnitude estimation from early
radiated energy, Geophys. Res. Lett., 35, L22307, doi:10.1029/
2008GL035576.PublishedL223074.1. Metodologie sismologiche per l'ingegneria sismicaJCR Journalreserve
Simulated shaking maps for the 1980 Irpinia earthquake, MS 6.9: Insights on the observed damage distribution
No full textConglomerati bituminosi a caldo: correlazioni fra caratteristiche di composizione e meccaniche
No full textCurve di transizione a gradiente di curvatura progressivo: la curva biparametrica delle ferrovie
No full textSulla seformazione permanente per carichi ripetuti di conglomerati bituminosi in rapporto alla dosatura in legante
No full textReply to comment by P. Rydelek et al. on "Earthquake magnitude estimation from peak amplitudes of very seismic signals on strong motion records"
No full textBased on the analysis of Mediterranean, near-source,
strong motion records Zollo et al. [2006] (hereinafter
referred to as ZLN) showed that peak displacement amplitudes
of initial P- and S-wave seismic signals scales with the
earthquake size in the moment magnitude range 4 < Mw <
7.4. Similar evidence have been also reported for southern
California [Wu and Zhao, 2006] and Taiwan [Wu et al.,
2006] using only P-wave arrivals up to 100 km distance on
mostly short period and broadband waveform data.PublishedL203033.1. Fisica dei terremotiJCR Journalreserve
An evolutionary approach to real-time moment magnitude estimation via inversion of displacement spectra
No full textWe present an evolutionary approach for magnitude estimation for earthquake early warning based on real-time inversion of displacement spectra. The Spectrum Inversion (SI) method estimates magnitude and its uncertainty by inferring the shape of the entire displacement spectral curve based on the part of the spectra constrained by available data. The method consists of two components: 1) estimating seismic moment by finding the low frequency plateau Omega(0), the corner frequency f(c) and attenuation factor (Q) that best fit the observed displacement spectra assuming a Brune omega(2) model, and 2) estimating magnitude and its uncertainty based on the estimate of seismic moment. A novel characteristic of this method is that is does not rely on empirically derived relationships, but rather involves direct estimation of quantities related to the moment magnitude. SI magnitude and uncertainty estimates are updated each second following the initial P detection. We tested the SI approach on broadband and strong motion waveforms data from 158 Southern California events, and 25 Japanese events for a combined magnitude range of 3 <= M <= 7. Based on the performance evaluated on this dataset, the SI approach can potentially provide stable estimates of magnitude within 10 seconds from the initial earthquake detection
Does The Slip In The Early Steps Of The Rupture Scale With The Final Magnitude Of The Event ?
No full text- …
