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| English: Recent earthquakes from w.United States Geological Survey from the last 8-30 days around the world. (Photo credit: Wikipedia) |
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| Area of the Cascadia subduction zone, including the Cascade Volcanic Arc (red triangles) (Photo credit: Wikipedia) |
Once an earthquake exceeds 7.0 on the Richter magnitude scale (ML), that scale does not work very well. It had the goal of quantifying medium-sized earthquakes (between magnitude 3.0 and 7.0). The Richter magnitude scale was developed in 1935 by Charles F. Richter of the California Institute of Technology as a mathematical device to compare the size of earthquakes. The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs.)
The moment magnitude scale (abbreviated as MMS; denoted as MW or M) is used by seismologists to measure the size of earthquakes in terms of the energy released.[1] The magnitude is based on the seismic moment of the earthquake, which is equal to the rigidity of the Earth multiplied by the average amount of slip on the fault and the size of the area that slipped.[2] The scale was developed in the 1970s to succeed the 1930s-era Richter magnitude scale (ML). Even though the formulae are different, the new scale retains the familiar continuum of magnitude values defined by the older one. The MMS is now the scale used to estimate magnitudes for all modern large earthquakes by the United States Geological Survey.[3]
>>> Sound On >> Best viewed Full Screen
http://youtu.be/Yukp0bPkQxs
Countdown to catastrophe: Earthquake in North America - Source: National Geographic
Uploaded on Aug 25, 2011
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Red Cross British Columbia
Narrated by Bruce Williams,
A-Channel, Victoria, BC
- PREPARING FOR THE UNEXPECTED Pt 1
of 2 http://youtu.be/cRp1dUCEkSU
Uploaded on July 19, 2009
Red Cross describes how to prepare for an emergency in British Columbia
>>>>>>>>>>>>>>>>>> also,
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M9+ Momentum Flux Mega Quake Will Hit Western North America
It is just a matter of time, 300
years on average, it is past due.
Published on Nov 14,
2012
This movie shows a physics-based computer simulation of the tsunami
expected from the next Cascadia Earthquake. The last large Cascadia earthquake happened in January, 1700. It is thought that the fault
is getting toward the final stages in the earthquake cycle and could
break again at any time. The simulation suggests wave run-ups (tsunamis; sometimes erroneously called tidal waves) of as much
as 10 meters (60 feet) could hit most adjacent shores within 30 minutes.
* The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs (adjustments are included to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquake). Wikipedia
* The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs (adjustments are included to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquake). Wikipedia
Explore: Epicenter
The moment magnitude scale was introduced in 1979 by Tom Hanks and Hiroo Kanamori as a successor to the Richter scale and is used by seismologists to compare the energy released by earthquakes. sciencedaily.com
Explore: Moment magnitude scale, Seismology
Unlike the moment magnitude scale (formerly Richter scale), which measures the energy released by the earthquake, the JMA scale describes the degree of shaking at a point on the Earth's surface, and is analogous to the Mercalli intensity scale. Wikipedia
** In the various subfields of physics, there exist two common usages of the term flux, each with rigorous mathematical frameworks. A simple and ubiquitous concept throughout physics and applied mathematics is the flow of a physical property in space, frequently also with time variation. It is the basis of the field concept in physics and mathematics, with two principal applications: in transport phenomena and surface integrals. The terms "flux", "current", "flux density", "current density",
can sometimes be used interchangeably and ambiguously, though the terms
used below match those of the contexts in the literature.
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