Earthquake

(redirected from seismic activity)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to seismic activity: Volcanic activity
A geological event caused by shifting tectonic plates, triggered by a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude (or the related and mostly obsolete Richter magnitude) of an earthquake is conventionally reported. Magnitudes of 3 or lower are mostly imperceptible; magnitudes of 7 or more cause serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale
Cause of death Direct trauma due to collapse of buildings, dehydration, shock, crush injury
References in periodicals archive ?
In general, the seismic activity of whole Pakistan, north Pakistan and south Pakistan is high as demonstrated from the various seismic hazard models for the investigated region.
Vertical movements of the Earth's surface display stress and deformations at the measures of tectonic blocks and the upper mantle and have obvious connection to seismic activity. Their intensity varies in time.
That should lead to a gradual reduction in seismic activity.
Scientists are not sure why seismic activity has spiked, but they are studying the phenomenon.
Helen Rimmer is not convinced on the new controls: "Although they say they can increase monitoring of seismic activity and risk, that's not going to reduce the risk and it won't make it safe.We simply think this is a risk not worth taking when we don't need the gas, we need to develop our renewable energy resources."
The SETS will also measure seismic activity caused by rocks cooling inside the planet.
Newport Corp.'s Earthquake Restraint System--Model ERS2010--is designed to restrict the motion of pneumatically isolated optical table tops during seismic activity. The system is certified and in compliance with the 2009 International Building Code and the 2010 California Building Code.
"The risk of seismic activity associated with hydraulic fracking operations is small and the probability of damage is extremely small - we suggest fracking can continue under our recommendations," one of the report's authors, the British Geological Society's Brian Baptie, said at a briefing.
While proponents of fracking cite it as a boon for the economy and say that there's no proof of a direct link between fracking and seismic activity, the insurance industry could and should be put on notice.
The team has installed a seismic monitoring station there to alert them to seismic activity that may be the precursor to volcanic activity, according to Al-Maflahi.
At the same time, there has been a big upswing in seismic activity in the North Sea this year.
The Commission admits that it needs first-hand information on contingency plans and safety measures in place in the EU in the event of seismic activity. This includes information on controls effectuated by national authorities, safety requirements for earthquakes and emergency power supply systems for reactor cooling.