Tsunamis

Three primary sources of information can be used to answer the question "Could It Happen Here? Tsunamis That Have Struck U.S. Coastlines": (1) tsunami catalogs of historical events, (2) the age of geologic deposits left by great earthquakes and tsunamis...
In 2005, the President's tsunami-warning initiative directed $37.5 million to the USGS and NOAA to improve the Nation's domestic tsunami detection and warning system. As part of that commitment, the USGS has received $13.5 million to strengthen its...
Tsunamis are ocean waves triggered by large earthquakes that occur near or under the ocean, volcanic eruptions, submarine landslides, and by onshore landslides in which large volumes of debris fall into the water. Scientists do not use the term "tidal...
Although earthquake magnitude is one factor that affects tsunami generation, there are other important factors to consider. The earthquake must be a shallow marine event that displaces the seafloor. Thrust earthquakes (as opposed to strike slip) are far...
Although both are sea waves, a tsunami and a tidal wave are two different and unrelated phenomenona. A tidal wave is the wave motion of the tides. A tidal wave is a shallow water wave caused by the gravitational interactions between the Sun, Moon, and...
On January 19, 1968, a thermonuclear test, codenamed Faultless, took place in the Central Nevada Supplemental Test Area. The codename turned out to be a poor choice of words because a fresh fault rupture some 1200 meters long was produced. Seismographic...
No. Neither the USGS nor any other scientists have ever predicted a major earthquake. They do not know how, and they do not expect to know how any time in the foreseeable future. However based on scientific data, probabilities can be calculated for...
Earthquakes are recorded by a seismographic network. Each seismic station in the network measures the movement of the ground at the site. The slip of one block of rock over another in an earthquake releases energy that makes the ground vibrate. That...
Learn more: Earthquakes by State/Territory or Earthquakes by Country/Region.
Estimate what EQ of what size are likely to occur (geology)Given the EQ size we then estimate what the shaking will be (seismology)Given the shaking we estimate the response of different types of buildings (EQ engineering). Only with all these steps can...