Chance News 91
Quotations
Forsooth
Aquila earthquake chart
“The L’Aquila earthquake: Science or risk on trial”
by Jordi Prats, Significance magazine, December 2012
Prats discusses the April 2009 Italian earthquake during which about 300 residents lost their lives. Readers will recall news about the 13-month trial of the six scientists (and a government official), who were each sentenced to six years in prison for “providing ‘inaccurate, incomplete and contradictory information’ on the probability and risk of an earthquake and for falsely reassuring the population.” (See “The perils of failed predictions”, Chance News 89, October-November 2012.)
Prats reports that, according to the Italian Macroseismic Database, "L’Aquila has suffered earthquakes of magnitude 6 or higher on 13 occasions in the period 1315-2005, approximately every 50 years." Also, he reports that, according to a 1988 seismology paper, “Alarm systems based on a pair of short-term earthquake precursors”, "[T]he probability of a weak shock or swarm being followed by a major shock in the following 2-5 days is very low, of the order of 1-5%."
Prats believes that the most important information for the public would have been the risk (in the sense of expected loss) of an earthquake, and not the just its likelihood, because such a risk assessment would have included both the probability of an earthquake and the expected loss in the event of an earthquake.
In any case, Significance Editor Julian Chamkin has given permission to post the following chart from the article (email of January 14, 2013):
Discussion
1. Based on the chart, would have recommended that the public be informed, in the March or April 2009, that they should be prepared for a serious earthquake? Note that someone who predicted one on TV and the Internet was accused of being "alarmist," according to Wikipedia.
2. Consider the Challenger disaster in the U.S. in 19??. Ed Tuftee presented a chart which he wanted to illustrate the danger of launching at 30-degree temperature. to be continued ...
Submitted by Margaret Cibes