To find the epicenter (the point on the earth's surface where an earthquake begins) during earthquakes, one need to view the seismogram (a record of the ground motion), and at least two other seismographs recorded for the same earthquake. Other instruments such as a map, a compass for sketching circles on the map, a ruler, and a pencil will also be used.
The following are the steps of the triangulation process in the correct order to find the epicenter during earthquakes:
Step 1: Subtract the time of P wave arrival from S wave arrival.
Step 2: See what the time difference is equal to in distance on a seismic wave chart.
Step 3: Draw circles representing the distances from at least three seismograph stations to the epicenter on a map.
Step 4: Find the point where all 3 circles intersect, and you've found the earthquake's epicenter.
The Earth is roughly a sphere. The Earth is an irregularly shaped ellipsoid.
<span>The regions of lowest elevation in northern sub-Saharan Africa (i.e., between 10 and 20 degrees north latitude) tend to be <span>in the west.
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Sub-Saharan Africa has a wide variety of climate zones, in this particular area (Nigeria/Congo) <span>the </span>climate<span> is hot and humid in the lower elevation parts, this particular zone is in the western part of Africa, lying close to the equator.</span>
