Earthquake Definition and 172 Threads

I don't know that this completely fits in the mech. eng. category but I figure this crowd would know as well as anyone. so I like to spend my free time thinking about these kinds of things. I am always trying to come up with innovative solutions to problems. here goes, I have seen the...

A large earthquake (7.8) has been reported on the border region in Iran near the border with Pakistan's Balochistan province. http://earthquake.usgs.gov/earthquakes/eventpage/usb000g7x7#summary This is coincident with a number of mag 5 and 6 earthquakes along the junction of the Australian...

6 scientists and a gov official in Italy are sentenced to 6years and 10million euro fine each for not predicting an earthquake...sounds like news that should be coming from places like Haiti. http://edition.cnn.com/video/?hpt=hp_t4#/video/crime/2012/10/23/bw-italy-laquila-verdict.cnn

The seismic waves of earthquake travels at around 5 km/s. Wouldn't it be possible to setup network of detectors through out the world, and pre-warn people about approaching earthquake in real-time?

http://www.yomiuri.co.jp/dy/national/T120209007089.htm "Fukushima No. 2 plant was 'near meltdown'" http://ex-skf.blogspot.com/2012/01/japanese-expert-says-fukushima-ii-not-i.html "Just In: Japanese Expert Says Fukushima II (not I) Nuke Plant's Containment Vessel Has Been Damaged by the Quake"

We're approaching the bicentennial anniversary of the largest earthquake and swarm east of the Rocky Mountains, at least in recent history. Coincidentally, Oklahoma has just had it's largest earthquake in the state's history. Bicentennial of the New Madrid Earthquake Sequence December...

Hello, I want to write an earthquake simulation for one of my programming classes and wanted to know where to look to get started understanding some of the forces and other properties of earthquakes. This is for a video game physics class so it doesn't have to be super accurate the class is...

Hi there. So, I was wondering if there is anyway to tell what the perceived magnitude of today's earthquake is, based on my distance from the epicenter. I live around Princeton, so I was about 250 miles north of the epicenter. I was thinking that there might be an equation that describes how...

Virginia US Earthquake -- Nuclear Plant The earthquake that just hit the east coast was centered on Mineral, VA, right where http://en.wikipedia.org/wiki/North_Anna_Nuclear_Generating_Station" is. :rolleyes:

5.8 in Virginia http://www.google.com/search?client=opera&rls=en&q=recent+earthquakes&sourceid=opera&ie=utf-8&oe=utf-8&channel=suggest According to Wikipedia, this is the strongest earthquake since a similarly sized one in 1897...

No joke. Did anyone else feel it? OK, there was a 5.8 in Virginia. We felt it here too.

Yeah, desk shook a little and everything. It kinda freaked me out. Was there a big earthquake somewhere else in the world just now?

Well i am researching on seismology and tectonic plates. My project hypothesis is related to reducing the magnitude of P-S-L waves that are generated when tectonic plates collide,create subduction zones etc. for the project i have a choice of submitting a theoretical or real model.my query is...

This came out in May. I just saw it. http://arxiv.org/abs/1105.2841 There were interesting signals in the atmosphere that peaked just 3 days before the earthquake struck. Apparently the deep rock layers around the fault show they are stressed by releasing radon gas, which has a detectable...

Homework Statement Earthquakes produce several types of shock waves. The best known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the Earth's crust, P-waves travel at around 6.40 km/s while S-waves move at about 3.60 km/s. (The actual speeds vary...

Is it possible to "create" an earthquake? Hypothetically if you buried and detonated a dozen or a hundred nukes along an active fault line, like the San Andreas, would the release of that much energy cause a major earthquake along that faultline?

How crazy is this? Continued... This is beyond absurd. http://news.yahoo.com/s/livescience/20110526/sc_livescience/seismologiststriedformanslaughterfornotpredictingearthquake

The french IRSN just released a new report concerning the estimated contamination around DAICHI, i extract this map for the Cs contamination based on SPEEDI/MEXT estimations. The complete report is here (french)...

Just kidding. World isn't ending. *starts gathering Get Out Of Ban Free cards*

On the Japanese Earthquake: Nuclear Plants thread in PF Nuclear Engineering forum we have been having a lot of trouble figuring out descriptions of mudstone and plant foundations built on solid bedrock. Can anyone help me on this. I followed some research clues and found the following: A...

The "more political thread" besides "Japan Earthquake: nuclear plants" scientific one As agreed with PF Mentor Borek, i start this new thread which intends to be a complement to the big and permanently updated "Japan Earthquake: nuclear plants" thread (which started here...

An earthquake can release enough energy to devastate a city. Where does this energy 'reside' a moment before the earthquake takes place?

With everything that's going on at Fukushima, I'm wondering how a newer reactor (Generation III or newer) would have held up under the same conditions? I understand it's near impossible to tell from anything this catastrophic and unprecedented, but perhaps Astronuc or someone else more...

Supposedly, you use a certain type of seismometer. But in that case, how could a deep earthquake far away register as "higher" than a shallow earthquake that's up close? Sure, the deep earthquake may release more energy, but much of it is dissipated by the time it reaches the seismometer (and...

http://www.youtube.com/user/citizentube#grid/user/0870831CE43351E1 http://earthquake.usgs.gov/earthquakes/shakemap/global/shake/c0001xgp/ Yes, it was the most powerful Japanese earthquake in terms of the amount energy released. But the youtube videos show that the shaking wasn't even that...

Does anyone have any reliable info on the nuclear plants - the reports on the news seem garbled to me. Edit by Borek: To All: Please stick to technical aspects and to things happening at the Fukushima Daiichi NPP. There are several other threads discussing different aspects of the...

8.9 earthquake in Japan: tsunami warnings

Homework Statement When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P, wave has a speed of about 7.87 km/s and the secondary, or S, wave has a speed of about 4.86 km/s. A seismograph, located some distance away, records the arrival...

http://www.cnn.com/2010/WORLD/asiapcf/09/03/new.zealand.quake/index.html?hpt=T1 http://www.bbc.co.uk/news/world-asia-pacific-11183685

The elections for a new parliament have caused remarkable shifts in political Netherlands. It's all recorded here already (tentatively - it's not formal yet). Note the big plusses and minusses. A sharp right turn was made. Basically the moderate center (CDA) has suffered, while the liberals...

Just in (6:35 EDT, it's now 6:49), few details yet. Epicenter: 2.236°N, 97.046°E (Next to an island, just off the coast) Depth: 46 km CNN: http://news.blogs.cnn.com/2010/04/06/usgs-earthquake-strikes-northern-sumatra/?hpt=T2 USGS...

I was down at the cafe where I hang out this afternoon while a clever person of my acquaintance was at work fixing my laptop, when the table started doing a rock and roll dance. I thought at first he was pushing on it and he thought I was doing it. Suddenly we both realized it was an earthquake...

The project entails the design and simulation of a system to stabilize a building in the event of an earthquake. The idea is to numerically test the response of the system to earthquake conditions and see how it performs. It will also involve varying the relevant parameters to obtain the most...

Homework Statement Assume that P and S (Primary and Secondary) waves from an earthquake with a focus near the Earth's surface travel through the Earth at nearly constant but different average speeds. A monitoring station that is 1000 km from the epicenter detected the S wave to arrive at 42...

This is just a question that has been bugging me for awhile, but, in a worst-case scenario, if you say had an earthquake where the ground split open, and a nuclear plant was right over the split, could the reactor literally be "ripped open" in such an instance? And if so, would this cause the...

http://www.newsdaily.com/stories/tre53504a-us-quake-italy/ ROME, Apr. 5, 2009 (Reuters) — A 6.7 magnitude earthquake struck central Italy Monday about 53 miles northeast of Rome, the U.S. Geological Survey reported.

I have heard people talk about "earthquake weather" and we had weird weather today. Hazy and very hot with warm winds. The weather website said it was 90 degrees F at sundown. This was copied from another thread where Math Is Hard experienced an earthquake while making a post - Ivan...

Homework Statement 4people with uniform mass= 72.4kg car mass= 1130kg earthquake strikes,car is stationary. vertical oscillations make car bonuce on suspensions. when frequency= 1.8 Hz car exhibits maximum Amplitude of vibration. Earthquake over,4 people leave the car quickly,what...

Hi everyone, I live in Chengdu, China where as many of you may know suffers a terrible earthquake aftershock nowadays. But during every aftershock there's always a wind blowing from nowhere. I wonder why? Many of my classmates & friends notice this as well. Are there any scientific explanations?

Earthquake! in Illinois! Earthquake rattles Tri-State http://www.courierpress.com/news/2008/apr/18/earthquake-rattles-tri-state/ I woke up to a noise--looked at the clock 4:35--like the wind rattling the window--but it was one of the paintings on the wall rattling against the wall...

http://news.bbc.co.uk/1/hi/england/7266136.stm Wow, that was about 30 miles from my house. No damage, but certainly a shock to wake up to. Did anyone else feel it?

[SOLVED] Distance To Center of Earthquake? Homework Statement An earthquake releases two types of traveling waves, called "traverse" and "longitudinal." The average speed of traverse and longitudinal seismic waves in rock are 8.9 km/s and 5.1 km/s respectively. A seismograph records the...

Homework Statement Assuming typical speeds of 8.9 km/s and 5.8 km/s for P and S waves, respectively, how far away did the earthquake occur if a particular seismic station detects the arrival of these two types of waves 1.0 min apart? _____km Homework Equations v=(lamba)(f)...

[SOLVED] Simple Harmonic Motion Homework Statement Four people, each with mass of 71.1 kg, are in a car with a mass of 1180 kg. An earthquake strikes. The vertical oscillations of the ground surface make the car bounce up and down on its suspension springs, but the driver manages to pull of...

As a resident of the San Francisco Bay Area, the recent quake got me thinking - how prepared are the buildings and structures in the Bay Area for the upcoming 'Big One'? I mean, are the majority of buildings, bridges, and tunnels capable of handling a magnitude 7 or 8 quake? Also, what about...

Homework Statement Earthquakes produce several types of shock waves. The most well known are the P-waves (primary or pressure) and the S-waves (secondary or shear). In the Earth's crust, the P-waves travel at around 6.5km/s, while the S-waves move at about 3.5km/s. The actual speeds vary...

I have to just throw this one out and see what comes. I have no idea if this is credible, but there are claims that local news agencies in Peru are reporting that earthquake lights were seen before and after the recent quake. There are a couple of videos included in the report...

http://earthquake.usgs.gov/eqcenter/eqinthenews/2006/uswtai/ This is where I spotted the news... http://www.msnbc.msn.com/id/11100901/

When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P, wave has a speed of about 8.0 km/s and the secondary, or S, wave has a speed of about 4.5 km/s. A seismograph, located some distance away, records the arrival of the P wave and...

3.9 (Minor) - 4 miles (7 km) SSE (157°) from Bar Harbor, ME - Minor yes, but strong enough to send boulders rolling off hills and blocking roads. Bar Harbor is a small populated area. Tuesday, October 3, 2006 at 00:07:37 (UTC) = Coordinated Universal Time Monday, October 2, 2006 at...