Along the San Andrea's fault which runs along the California coast line and up into Alaska.
There are at least two US geologic features called the "Emerson Fault" : one in Georgia and one in southern California. NORTHERN GEORGIA The Emerson Fault is a geologic feature associated with the creation of the Appalachian Mountains. It runs from northern Alabama to near Carterville in northern Georgia. (see related question) SOUTHERN CALIFORNIA The Emerson Fault, Camp Rock Fault, and Copper Mountain Fault form a 100 km line through the Mojave Desert north and east of Barstow, CA. These faults, among others, were involved in the Landers earthquake of 1992, which occurred north of Yucca Valley and Palm Springs, CA.
Fault lines are really located everywhere, but it's usually the major fault lines that you need to worry about. The recent Virginia earthquake, which occurred on Aug. 23, 2011, was not related to any major geological fault line. However, geologists are concerned with the New York-Alabama Lineament, which is a major magnetic fault line that runs from New York to Alabama. See the Related Link below for more information on fault lines in the U.S. east of the Rocky Mountains.
Earthquakes in the middle US states are a concern because the fault line there could lead to the highest loss in economy due to a natural disaster.
The area known as the Pacific Ring of Fire is where you will find active volcanoes in the US, it includes all of the State of Hawaii, the San Andres fault line in California (though technically the fault line is not a volcano, it is active) and the currently dormant volcanoes from California up to Washington; Mt Shasta, Mt Hood, Mt St. Helens, Mt Baker, Mt. Rainier and if I am not mistaken there is one in Alaska as well.
The second largest country in North America is the United States of America, with a total area covering 9,629,091 km2, after Canada. The second largest country in South America is Argentina, with a total area covering 2,766,890 km2, after Brazil.
The second largest city in the US is Los Angeles.
The second largest state, as in country, is Canada. The second largest state in the world is Alaska. The second largest state in the US is Texas.
The second largest Ocean is the Atlantic ocean
Lake Powell
Texas.
The second longest river the U.S is the Mississippi river
The US has the world's second largest pulp industry
The US has the second largest economy in the world, as the European Union has the largest economy, although not a nation. Out of countries, China has the second largest economy.
The largest and most famous earthquake fault in California is the San Andreas fault. It is 800 km long. It is significant because it runs through a heavily populated area (Los Angeles) and it is likely to do very serious damage some day. The San Andreas fault is a transform fault.
Texas.
Philadelphia
Texas