(Public domain.) )The shaking from the M6.7 Northridge, CA earthquake was more intense and covered a wider area than the slightly larger M6.8 Nisqually, WA earthquake.The reason is shown by the two cartoon cross-sections below. Their dependencies and relationships can be complicated, and even one of these concepts alone can be confusing.Here we'll look at each of these, as well as their interconnectedness and dependencies.Sketch of a traditional seismometer.

)If we sum all of the energy release from all of the earthquakes over the past ~110 years, the equivalent magnitude ~ Mw9.95.If the San Andreas Fault were to rupture end-to-end (~1400km), with ~10m of average slip, it would produce an earthquake of Mw 8.47.If the South American subduction zone were to rupture end-to-end (~6400km), with ~40m of average slip, it would produce an earthquake of Mw 9.86.You would need ~14,000km fault length, with a seismogenic thickness averaging 40km (width of 100km), to slip and average of 30m to produce an Mw 10.Map showing a fault with length ~14,000km, outlined in black, which would be needed to produce a Mw 10 earthquake. much of the available local energy is used to power the earthquake fracture growth, producing heat rather than generating seismic waves which radiate outward and are detected by seismographs. How big can tsunami waves get? An earthquake releases energy at many frequencies, and in order to compute an accurate value, you have to include all frequencies of shaking for the entire event.While each whole number increase in magnitude represents a tenfold increase in the measured amplitude, it represents an The energy can be converted into yet another magnitude type called the The energy release can also be roughly estimated by converting the moment magnitude to energy using the equation log E = 5.24 + 1.44M, where M is the magnitude.Did You Feel It?

This is equivalent to 1,600 times the size of the atomic bomb dropped on Hiroshima" (U.S. Geological Survey). Look under the “How much energy is released by an earthquake?” link. You consent to our cookies if you continue to use our website. There was more shaking in the Northridge earthquake because the earthquake occurred closer to the surface (3-11 miles), as opposed to the Nisqually earthquake's deeper hypocenter (30-36 miles).Image showing the location and depth of the Northridge and Nisqually earthquakes. Click on a pin on the map to see more information. If you go to wikipedia to TNT equivalent - Wikipedia there’s a table there that lists the released energy of a mess of different phenomena. (Public domain. Seismometers record the vibrations from earthquakes that travel through the Earth. The data used to be gathered from postal questionnaires, but with the advent of the internet, it's now collected using a web-based form. Earthquake magnitude, energy release, and shaking intensity are all related measurements of an earthquake that are often confused with one another. All of the subduction zones in the World, plus some adjoining structures amount to ~40,000km, and the circumference of the Earth is ~40,000km, so an Mw 10.5 is highly unlikely.Map outlining all subduction zones and other structures in the world, amounting to a length of ~40,000km, which would still not be enough to produce a Mw 10.5 earthquake. An earthquake releases energy at many frequencies, and in order to compute an accurate value, you have to include all frequencies of shaking for the entire event. More on that later.Although similar seismographs had existed since the 1890's, it was only in 1935 that Charles F. Richter, a seismologist at the California Institute of Technology, introduced the concept of earthquake magnitude. The two scales will indicate similar results if the earthquake magnitudes are between 3.0 and 7.0. )Whereas the magnitude of an earthquake is one value that describes the size, there are many intensity values for each earthquake that are distributed across the geographic area around the earthquake epicenter. Weird & WackyWe use cookies to personalise content and ads, to provide social media features and to analyse our traffic. The amount of seismic energy released by a 9.0-magnitude earthquake equals about 475 million tons of TNT, according to the United States Geological Survey. While each whole number increase in magnitude represents a tenfold increase in the measured amplitude, it represents an 32 times more energy release. )Earthquake magnitudes and energy release, and comparison with other natural and man-made events.

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