Earthquake magnitude estimation from early radiated energy

Abstract

[1] From 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,

Rapid on-site peak ground acceleration estimation based on support vector regression and P-wave features in Taiwan

“…Furthermore, a simple linear relationship between the logarithm of both the P-wave features and the target earthquake parameter is often preferred [10,12,6,17,1,4]. Sometimes, the combination of the P-wave features could lead to a better empirical regression [4].…”

Source Parameter Estimation Method for Assessment of Structural Resiliencies

“…To correct the calculated MI and values for the effects of distance, we normalize them to a reference distance of 80 km, which is the average of the hypocentral distances from the analyzed data set, as the way followed by Zollo et al [10] and Festa et al [11]. …”

“…However, for large earthquakes, the use of a limited portion of signals allows capturing only the slip contributions from a limited fault portion, which may result in the underestimation of final earthquake magnitude (i.e., the saturation problem) [11,14].…”

Predicting the macroseismic intensity from early radiated P wave energy for on‐site earthquake early warning in Italy

“…The present study explores the use of the squared velocity integral (hereinafter, IV2) [ Festa et al ., ] measured on P waves, which is considered a proxy of the early radiated energy of P waves, as the key parameter of a new on‐site EEW methodology aiming at the prediction of the macroseismic intensity at target sites and areas.…”