Each earthquake has just one epicentre.
Yes! Earthquake epicentres and volcanoes both tend to be concentrated at or near the boundaries of tectonic plates.
An epicenter is a point on earth's crust which is directly above the place where an earthquake originates which is called the focus.
At the boundry of two tectonic plates, you get volcanoes, earthquake epicentres and ( if its under the ocean) tsunamis.
There is no such thing as an "epicenter" to a hurricane. These are specific to earthquakes. Hurricanes have eyes, where the weather is typically clear from subsiding air and the pressure is its lowest.
Usually they hit the east coast, coming from epicentres in the Marianas trench
Tsunamis do not have epicentres. Earthquakes do. Sometimes, as in the case of Japan, earthquakes cause tsunamis.
Seismologists require:The exact location of the seismometer stationThe P and S-wave arrival times as recorded on a seismometerKnowledge of the subsurface geologyThe same information for two other seismometer stationsKnowledge of the sub surface geology is required in order to estimate the P and S-wave velocity which is a function of the elastic modulus and density of the rock.Please see the related question for further information on locating earthquake epicentres.
how many seismograph stations benifit earthquake victims after the damage occurs
The earthquake effectively split the country in half.There was an earthquake today.An earthquake that occurs close to water can result in a very destructive tsunami.
17,649 are missing in japan earthquake.
It depends on the earthquake you are talking about. Many have occurred in Japan. The most recent is the 2011 earthquake.
There are excellent articles on both the Canterbury earthquake and the Christchurch earthquake in wikipedia.