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- Longer aftershocks duration in extensional tectonic settings | Scientific Reports
- Powerful aftershocks likely after 7.1 earthquake rattles Las Vegas — VIDEO
Longer aftershocks duration in extensional tectonic settings | Scientific Reports
On the other hand, the global NEIC network enables spatially homogeneous detection of aftershocks, although the stations are much sparser than those of the JMA. Since our goal is to provide a forecasting method that will work in real time, the forecasting method should be tested using either real-time observations or the earliest quasi-real-time observations.
To analyse the aftershock sequence the M6. For the analysis of the aftershocks of the Nikko earthquake, the data is considered to be spatially homogeneous because the aftershock region is limited to the narrow area.
Powerful aftershocks likely after 7.1 earthquake rattles Las Vegas — VIDEO
Thus, we will estimate a sequence of the parameters. Given a sequence of magnitudes of detected earthquakes, the likelihood function is rewritten as where in equation 4. In this case, the hyper-parameters are optimized by maximizing the posterior probability distribution , where is the marginal likelihood function, given as. Because the exact treatment of the non-Gaussian high-dimensional integration appearing in the calculation of the marginal likelihood function is intractable, we approximate this optimization by the method described in Section S3 in Supplementary Information.
A similar Bayesian model for estimating the time-dependent detection rate was implemented using cubic spline 19 or broken-line-type parameterization The present state-space representation of the Bayesian model enables adaptive updating of the prediction in real time. Another novelty of the proposed model is the introduction of the prior probability distribution of the b -value. Owing to this prior, the estimate is robust even for a very short learning period.
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The centenary of the Omori formula for a decay law of aftershock activity. Earth 43 , 1—33 Kagan, Y. Short-term properties of earthquake catalogs and models of earthquake source. Enescu, B. Omori-Utsu law c-values associated with recent moderate earthquakes in Japan. Peng, Z. Migration of early aftershocks following the Parkfield earthquake.
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Functional shape of the earthquake frequency-magnitude distribution and completeness magnitude. On the nature of three Alaskan aftershock sequences. Lomnitz, C. Magnitude stability in earthquake sequences. Kitagawa, G. Bishop, C. Akaike, H. Likelihood and the Bayes procedure. Trabajos de Estadistica y de Investigacion Operativa 31 , — Immediate and updated forecasting of aftershock hazard.
Decay and expansion of the early aftershock activity following the , Mw9. Statistical models for earthquake occurrences and residual analysis for point processes. Space-time heterogeneity in aftershock activity. Wiemer, S. Download references. Correspondence to Takahiro Omi. This work is licensed under a Creative Commons Attribution 3. Pure and Applied Geophysics Geosciences Seismological Research Letters Nature Communications Entropy By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
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Abstract Forecasting the aftershock probability has been performed by the authorities to mitigate hazards in the disaster area after a main shock. Introduction A vast number of aftershocks occur following a large earthquake. Full size image. Results Estimating the forecasting model from observed data of incompletely detected earthquakes For the occurrence rate of underlying aftershocks of magnitude M at elapsed time t from the main shock, we employ the following model 3 : Here the parameters K , c , and p of the Omori—Utsu O-U formula for aftershock decay 7 , 12 , 13 and the b -value of the Gutenberg—Richter G-R formula for the magnitude frequency relation 14 are constants to be estimated.
Figure 2: Statistical model of observed magnitude frequency distribution. Table 1: Summary of the method Full size table. Figure 3: Estimation of time-dependent detection rate. Table 2: Summary of estimated parameters. Figure 4: Forecast of underlying aftershocks and observed aftershocks.
Discussion In this paper, we have proposed a method for forecasting underlying aftershock activity from the observed data of incompletely detected earthquakes. References 1. Google Scholar 2. Google Scholar 3. Google Scholar 7. Article Google Scholar 8. Article Google Scholar 9. Article Google Scholar Google Scholar Google Scholar Download references. Supplementary information PDF files 1. Supplementary Information Supplementary Information. Rights and permissions This work is licensed under a Creative Commons Attribution 3. About this article Publication history Received 17 May Accepted 26 June Published 17 July Lippiello , G.
Dozens of aftershocks have been recorded throughout the area since the earthquake. On Friday morning, the biggest one to hit the region so far came in at a 5. The 5. Four other aftershocks have followed within the same area, all around 3-magnitude. Write to Jasmine Aguilera at jasmine. Here's What to Know.
Fire departments across the region are responding, including with medical assistance. A strong earthquake rattled a large swath of Southern California and parts of Nevada on Thursday morning, making hanging lamps sway and photo frames on walls shake. There were no immediate reports of damage or injuries but a swarm of aftershocks were reported. Map by the U. Geological Survey depicts the intensity of the 6. In this image taken from video provided by Ben Hood, a firefighter works to extinguish a fire, Thursday, July 4, , following an earthquake in Ridgecrest, Calif.