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Topic: Peak ground acceleration

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	USGS Earthquake Hazards Program » ShakeMap Scientific Background
		The peak values of the vertical components are not used in the construction of the maps because they are, on average, lower than the horizontal amplitudes and ground motion prediciton equations used to fill in data gaps between stations are based on peak horizontal amplitudes.
		At present, ground motions are estimated using an empirical attenuation relationship, which is a predictive relationship that allows the estimation of the peak ground motions at a given distance and for an assumed magnitude.
		Thus, ground motions are estimated for a given magnitude earthquake, and at a particular distance from the assumed fault, in a manner consistent with recordings of past earthquakes under similar conditions.
	earthquake.usgs.gov /eqcenter/shakemap/background.php (0 words)

	GENERATION OF INSTRUMENTAL GROUND MOTION MAPS
		Initial maps are made with just the real-time component of TriNet, but they are updated automatically as more data are acquired.
		Parametric data from the stations include peak ground acceleration (PGA), peak ground velocity (PGV), and peak response spectral amplitudes (at 0.3 sec, 1 sec, and 3 sec).
		Figure 1: Map of southern California showing current TriNet station distribution.
	pasadena.wr.usgs.gov /shake/pubs/shake/node3.html (397 words)

	University of the West Indies - Seismic Research Unit
		By then it was clear that the method of basing seismic hazard estimates on Peak Ground Acceleration, Peak Ground Velocity and Peak Intensity had been largely abandoned by the engineering community in the United States, and by extension in the Caribbean region and in Trinidad and Tobago in particular.
		An alternative concept which does not suffer from the defects of the PGA concept is that of spectral ground acceleration.
		This is much more precisely defined as the peak response of a single degree of freedom oscillator with a particular natural frequency and a particular level of damping to excitation by a particular earthquake signal.
	www.uwiseismic.com /About/PROJECTS/proj_ttseis.html (566 words)

	ANV Measurement systems - Noise meter, Vibration meter, Sound level meter
		ANV Measurement systems - Noise meter, Vibration meter, Sound level meter
		Logs Peak Particle Velocity (PPV) and Peak Particle Acceleration (PPA) in 3 dimensions continuously or subject to selectable (time or level based) trigger
		Additional measurement parameters for each channel including dominant frequency (of the maximum PPV for each measurement period) and peak acceleration
	www.noise-and-vibration.co.uk /pages/vib/vibra.html (0 words)

	HAZUS Scenario for a Cascadia Subduction Zone Earthquake
		Peak Ground Velocities for a Magnitude 9.0 Earthquake in the Cascadia Subduction Zone
		Peak Ground Acceleration for a Magnitude 9.0 Earthquake in the Cascadia Subduction Zone
		The links above show maps for the Cascadia Region.
	crew.org /science/engineer.html (0 words)

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