This is debatable, but the three worst earthquakes in the U.S. were likely the San Francisco earthquake of 1906, the Alaskan earthquake of 1964, and the New Madrid, Missouri earthquake, which was in the early 19th century.
1990s
The worst plate boundary is the north american plate with the recorded worst for earthquakes
san bernardino
on fultlines and around them
* China * Iraq * Japan * Iran For details of the world's worst earthquakes, see the related link.
The three types of earthquakes are tectonic earthquakes, volcanic earthquakes, and collapse earthquakes. Tectonic earthquakes are the most common and are caused by the movement of earth's plates. Volcanic earthquakes occur in association with volcanic activity, while collapse earthquakes happen in underground mines and caverns.
Since 1870 there have been 7 recorded earthquakes in Erie PA, averaging 2.8 Richter (worst: 3.5). There have been three quakes were since 1990 (average 2.4 Richter). The greatest period without a quake was 56 years.
I think there are three types of earthquakes one is the earths crust
Any and all plate motion causes earthquakes.
Earthquakes occur at all three types of plate boundary.
The three worst sinners in hell are Brutus, Cassius, and Judas. According to the Divine Comedy.