What is Earthquake: Definition and 165 Discussions
An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to propel objects and people into the air, and wreak destruction across entire cities. The seismicity, or seismic activity, of an area is the frequency, type, and size of earthquakes experienced over a period of time. The word tremor is also used for non-earthquake seismic rumbling.
At the Earth's surface, earthquakes manifest themselves by shaking and displacing or disrupting the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides and occasionally, volcanic activity.
In its most general sense, the word earthquake is used to describe any seismic event—whether natural or caused by humans—that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake's point of initial rupture is called its hypocenter or focus. The epicenter is the point at ground level directly above the hypocenter.
By CHRISTOPHER TORCHIA, Associated Press Writer
http://news.yahoo.com/s/ap/20051008/ap_on_re_as/pakistan_quake
We have a number of members in Pakistan and India. I hope all are OK.
http://en.wikipedia.org/wiki/2005_Indian_subcontinent_earthquake
Breaking story:
http://www.usatoday.com/news/world/2005-03-28-indonesia-quake_x.htm
1609 UTC, measured at 8.2 by USGS and 8.5 by the Japanese equivalent, just north of the December '04 quake. Tsunami warning issued, no word on if a tsunami actually materialized...
I heard that it is bad to build a house made of stone on an area that is known for Earthquakes. Is that true? Are stones houses the worst against Earthquakes? That is what I heard, but I somewhat disagree with it.
Why would houses made of stone be bad for a house? It is heavy and cannot sway...
:confused: The internsity of a particular earthquake wave is measured to be 2.2 * 10^6 W/m^2 at a distance of 100km from the source. Now here is the part that I'm lost. What was the intensity when it passed a point only 4.0km from the source? And what was the total power passing through an area...
Earthquake tsunami in India.
Could a Earthquake of this size have caused a mountain to be thrust up in a different region of the world and cause this accident?
http://www.spacedaily.com/news/submarine-05a.html
I was reading in the newspaper and saw that it said that there was first an initial tidal wave, then the water receded for 10 minutes, then the big wave came crashing ashore. I was just trying to think on why the water would recede for so long, being 10 minutes. When the earthquake takes place...
I was wondering what is the equation that gives the values in a Jefferys – Bullen Table?
Specifically, what’s the equation for finding the distance (or angle) from a seismic station to the epicentre of an earthquake using the difference in travel times between S and P waves as recorded by the...
Dear Sirs,
I send you the next earthquake prediction for the
World for 2004.
Japan:
15th of September,8th of October,10th and 19th and
21th and 25th of November(maybe earthquake storm),7th
and 19th of December
Mongolia:28th of September
Algeria:7th-8th of September,28th of...
I can't believe the news everytime I hear these things.. they say 20,000 were killed in the Bam Earthquake.. and a major Iranian cultural heritage was destoyed at the same time (2000 yr old citadel).
I am posting this only to bring to your attention what is likely a coincidence, but possibly interesting.
https://www.physicsforums.com/showthread.php?s=&threadid=6004
This will either debunk itself in a week, or we move this prediction to another forum.
http://www.space.com/scienceastronomy/quake_prediction_030915.html
Edit: A summary of this thread:
A quake with a magnitude >= 7.0 was predicted for Tokyo for Tuesday or Wednesday. In fact...
When earthquake happened, some christians are very happy about it, they think this is a Good Sign that Jesus' second coming is impending!
Do you agree with this type of phycho ?
Do you think they are cold-blooded?
I don't think they go to the disaster area to offer humanitarian help to...
Bridge to 7 km and towers to 3.5 km. (plus other lightweight designs) at: http://groups.msn.com/DavesBridgesandTowers
My last thread was just starting to get interesting when the new forum took over! For anyone who missed the final messages, I have recently added more drawings to the site...