2006-12-17 01:17:42 · 8 answers · asked by Bhavisha D 1 in Science & Mathematics ➔ Earth Sciences & Geology
'That point within the Earth from which originates the first motion of an earthquake and its elastic waves.'
2006-12-17 01:20:04 · answer #1 · answered by Lucy 2 · 0⤊ 0⤋
The focus of an earthquake is where the earthquake was formed, and it is directly beneath the epicenter of the earthquake; the focus is underground, the epicenter is above ground. P waves and S waves are sent out from the focus, and detected by seismographs, which allows seismologists to be aware if an earthquake is nearby. The epicenter, which is directly above the focus is where the maximum amount of earthquake activity will occur.
2006-12-17 02:44:21 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Focus or hypocenter is a place where the earthquake is generated due to the movement of tectonic plates. The primary wave and secondary waves are generated from that point only. Generally non dangerous primary waves travel at a speed of about 13 to 17 K/M per second. It moves the particles in the direction of its propagation. This wave will travel through liquid and solid. The next wave is called secondary wave. That also generated from the point of focus. The speed is only half of the primary wave. This moves the particles perpendicular to the direction of its propagation. These waves are called body waves. The point above the focus point on earth is only called epicenter. The next two dangerous waves are generated from the surface of the earth called love wave and Raleigh waves. That is why I am working on developing simple quake alarm that will save the life during earthquakes by alerting at the time of sensing primary wave if this is fixed in the buildings that are prone to quakes. To know more on this please visit my slide show at URL
http://asia.pg.photos.yahoo.com/ph/quake
2006-12-19 01:12:53 · answer #3 · answered by A.Ganapathy India 7 · 0⤊ 0⤋
the focus of an earthquake is the point from which the the shockwaves start spreading from. the point directly above it on the earth's surface is the epicentre which is the point where the shockwaves become visible on land
2006-12-17 02:20:11 · answer #4 · answered by xodusj 2 · 0⤊ 0⤋
the point at which the earthquake occurs.
2006-12-17 01:41:58 · answer #5 · answered by ashwin_hariharan 3 · 0⤊ 0⤋
it is the point where the earthquake occurs
2006-12-17 01:26:22 · answer #6 · answered by azrasamsu 1 · 0⤊ 0⤋
see:
http://en.wikipedia.org/wiki/Earthquake_focus
2006-12-17 04:15:30 · answer #7 · answered by arbiter007 6 · 0⤊ 0⤋
try is website out http://en.wikipedia.org/wiki/Deep_focus_earthquake
i hope it helps
2006-12-17 01:22:02 · answer #8 · answered by Anonymous · 0⤊ 0⤋