计算美国东海岸的海啸风险

The greatest threat of a tsunami¹ for the U.S. east coast from a nearby offshore² earthquake stretches from the coast of New England to New Jersey³, according to John Ebel of Boston College, who presented his findings today at the Seismological Society of America 2013 Annual Meeting. The potential for an East Coast tsunami has come under greater scrutiny⁴（详细审查） after a 2012 earthquake swarm⁵ that occurred offshore about 280 kilometers (170 miles) east of Boston. The largest earthquake in the 15-earthquake swarm, most of which occurred on April 12, 2012, was magnitude (M) 4.0.   In 2012 several other earthquakes were detected on the edge of the Atlantic continental⁶ shelf of North America, with magnitudes between 2 and 3.5. These quakes occurred off the coast of southern Newfoundland and south of Cape⁷ Cod⁸, as well as in the area of the April swarm. All of these areas have experienced other earthquake activity in the past few decades prior to 2012.   The setting for these earthquakes, at the edge of the continental shelf, is similar to that of the 1929 M7.3 Grand Banks earthquake, which triggered a 10-meter tsunami along southern Newfoundland and left tens of thousands of residents homeless.   Ebel's preliminary findings suggest the possibility than an earthquake-triggered tsunami could affect the northeast coast of the U.S. The evidence he cites is the similarity in tectonic（构造的） settings of the U.S. offshore earthquakes and the major Canadian earthquake in 1929. More research is necessary, says Ebel, to develop a more refined hazard assessment⁹ of the probability of a strong offshore earthquake along the northeastern U.S. coast.