Institute of Mathematical Statistics Collections
Testing earthquake predictions
Statistical tests of earthquake predictions require a null hypothesis to model occasional chance successes. To define and quantify ‘chance success’ is knotty. Some null hypotheses ascribe chance to the Earth: Seismicity is modeled as random. The null distribution of the number of successful predictions – or any other test statistic – is taken to be its distribution when the fixed set of predictions is applied to random seismicity. Such tests tacitly assume that the predictions do not depend on the observed seismicity. Conditioning on the predictions in this way sets a low hurdle for statistical significance. Consider this scheme: When an earthquake of magnitude 5.5 or greater occurs anywhere in the world, predict that an earthquake at least as large will occur within 21 days and within an epicentral distance of 50 km. We apply this rule to the Harvard centroid-moment-tensor (CMT) catalog for 2000–2004 to generate a set of predictions. The null hypothesis is that earthquake times are exchangeable conditional on their magnitudes and locations and on the predictions–a common “nonparametric” assumption in the literature. We generate random seismicity by permuting the times of events in the CMT catalog. We consider an event successfully predicted only if (i) it is predicted and (ii) there is no larger event within 50 km in the previous 21 days. The P-value for the observed success rate is <0.001: The method successfully predicts about 5% of earthquakes, far better than ‘chance,’ because the predictor exploits the clustering of earthquakes – occasional foreshocks – which the null hypothesis lacks. Rather than condition on the predictions and use a stochastic model for seismicity, it is preferable to treat the observed seismicity as fixed, and to compare the success rate of the predictions to the success rate of simple-minded predictions like those just described. If the proffered predictions do no better than a simple scheme, they have little value.
First available in Project Euclid: 7 April 2008
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Primary: 62-06: Proceedings, conferences, collections, etc. 62G10: Hypothesis testing 62P12: Applications to environmental and related topics 62P35: Applications to physics 62P99: None of the above, but in this section 86-06: Proceedings, conferences, collections, etc. 86A15: Seismology 86A17: Global dynamics, earthquake problems
Copyright © 2008, Institute of Mathematical Statistics
Luen, Brad; Stark, Philip B. Testing earthquake predictions. Probability and Statistics: Essays in Honor of David A. Freedman, 302--315, Institute of Mathematical Statistics, Beachwood, Ohio, USA, 2008. doi:10.1214/193940307000000509. https://projecteuclid.org/euclid.imsc/1207580090
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