![]() Joy JE, Penhoet EE, Petitti DB (eds) (2005) Benefits and limitations of Holliday JR, Chen CC, Tiampo KF, Rundle JB, Turcotte DL, Donnellan A (2007) A RELM earthquake forecast based on pattern informatics. ![]() Holliday JR, Rundle JB, Turcotte DL, Klein W, Tiampo KF (2006) Space-time correlation and clustering of major earthquakes. Holliday JR, Turcotte DL, Rundle JB (2008) Self-similar branching of aftershock sequences. Holliday JR, Rundle JB, Tiampo KF, Donnellan A (2006) Systematic procedural and sensitivity analysis of pattern informatics method for forecasting large (M>5) earthquake events in southern California. In: Schubert G, Kanamori H (eds) Treatise on Geophysics (vol 4, pp 257–291), Schubert, G (Editor-in Chief) (Elsevier, Amsterdam) Hill DP, Prejean SG (2007) Dynamic triggering, in Earthquake seismology. Green DM, Swets JA (1966) Signal detection theory and psychophysics. Machine learning techniques indicate that signals in a correlation time series corresponding to future large earthquakes can be detectedīowman DE, Ouillon G, Sammis CG, Sornette A, Sornette D (1998) An observational test of the critical earthquake concept. We review two methods for visualizing the current state of the earthquake cycle from correlation in small earthquake patterns The current state of the earthquake cycle of tectonic stress accumulation and release is unobservable We conclude that the resulting timeseries can be viewed as proxies for the cycle of stress accumulation and release associated with major tectonic activity. Using seismic data from 1940 to present in California, we find that both methods provide nearly equivalent information on the rise and fall of earthquake correlations associated with major earthquakes in the region. ![]() The purpose of the present paper is to compare these two methods by evaluating their information content using decision thresholds and Receiver Operating Characteristic methods together with Shannon information entropy. These variables are based on correlations in patterns of small earthquakes that occur nearly continuously in time. In two previous papers, we have proposed methods to image the earthquake cycle in California by means of proxy variables. However, observing details of the actual values of time- and space-dependent tectonic stress is not possible at the present time. Reid following the M7.9 San Francisco earthquake of 1906. The earthquake cycle of stress accumulation and release is associated with the elastic rebound hypothesis proposed by H.F. ![]()
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