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3. With 2 you can get possible locations (where the 2 circles intersect). With the 3rd reading, that circle will intersect the other two circles at one of those 2 candidate locations. See the link for a description.

http://www.geo.mtu.edu/UPSeis/locating.html

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Q: How many seismic do you need to find an earthquakes epicenter?
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How many stations must compare results to determine the epicenter?

A minimum of three seismic stations must compare results to locate an earthquakes epicenter.


When studying seismic records from all over the globe what did scientists find out about the pattern of earthquakes?

Many earthquakes are concentrated in narrow zones along plate boundaries.


Describe how energy released at an earthquake's focus can cause damage on the surface many kilometers from the epicenter?

The movement of seismic waves


Where are seismographs located?

At many different earthquake centers. When an earthquake happens the tree nearest earthquake centers record the magnitude and intensity of the seismic waves produced by the earthquake in order to find the origin or epicenter


What energy uses transverse waves?

Light Energy, Seismic Energy (Earthquakes) Many More ...


How many earthquakes occur in the new Madrid seismic zone yearly?

5 days ago


Does an earthquake begins at the epicenter?

The epicenter is the point on the earth's surface directly vertically above the hypocenter (or focus) point in the crust where a seismic rupture begins.The epicenter is only "far from the center" on very deeply centered earthquakes where the hypocenter (or focus) point in the crust is very far from the surface. Many earthquakes are shallow.The depth of the hypocenter (or focus) point can be categorized as shallow (up to 70 km or 43.5 miles below the surface), intermediate (70 to 300 km), or deep (greater than 300 km or 186 miles).


How can energy released at an earthquake's focus deep inside Earth can cause damage on the surface many kilometers from the epicenter?

The energy of the seismic waves that reach the surface is greatest at the epicenter. The most violent shaking during an earthquake however may occur kilometers away from the epicenter. The types of rock and soil around the epicenter determine where and how much the ground shakes.


What is a area where few earthquakes have happened recently but will probably happen in the future?

If the part of the fault has had large earthquakes historically, then this may be a locked section, or seismic gap, where strain is building up for a future big earthquake. If there is no evidence of it having big quakes in the past then it may just not be very active.


When was Haiti's smallest earthquake?

That is impossible to tell. Smaller earthquakes occur more frequently, to the extent that the majority of earthquakes are too small to event be felt. Without a sophisticated seismic network, many earthquakes will not even be detected.


Can you predict the part of the US mostly to experience strong earthquakes?

Yes. Earthquakes occur most often along fault lines. There are also many different devices (seismograph) that sense seismic waves and can predict earthquakes.


What do you need to collect to find the epicenter of an earthquake?

You need to find how many km the earthquake is