If they used the Richter Scale, everyone in Japan would be filing an insurance claim for every wall or driveway crack they had. Each earthquake, on the other hand, has only one magnitude." If I were an insurance agent, I too would be more concerned with how much the ground was shaking in the claimant's neighborhood (what intensity scales like Mercalli indicate) than how much energy was released at the earthquake's focus - miles away and miles underground (what Magnitude scales indicate). These values can be best displayed using a contoured map. Preceding unsigned comment added by 71.203.126.185 ( talk) 18:46, 12 March 2011 (UTC) Reply From the article: " The effects of any one earthquake can vary greatly from place to place, so there may be many Mercalli intensity values measured for the same earthquake. How can there be a Mercalli reading for the "Sendai" quake when no one was at the epicenter to feel it? Or, are they saying this was the damage/feeling in Sendai (~ 70 miles from the epicenter)? This isn't clear. Since the epicenter was off the coast, there were no buildings that directly experienced the near-fault ground motion. The peak intensity experienced in the Christchurch EQ was similar to the peak intensity experienced in Japan due to the Great Eastern EQ (Sendai), but the size of the earthquake (the energy released) was magnitudes larger, and the area over which the ground motion was felt was also much much larger. Secondly, the size of the earthquake tells you nothing about the level of damage to individual buildings (which is what the MMI scale is intended for), although it may give some idea of the geographical range of the damage. Firstly, it was intended to give some idea of the total size of the earthquake, but it is out of date and has generally been replaced by the Moment Magnitude scale, whose units are energy (Joules). Wardog ( talk) 16:26, (UTC) Reply No - I think you are both confused about what the Richter Magnitude Scale is. Especially as extremely high-magnitude earthquakes can do relatively little damage (if they hit unpopulated and/or well-constructed areas), and weak earthquakes can cause massive damage (if tehy hit somewhere with lots of people in weak buildings). I don't know for sure, but its probably simply that insurance companies are most interested in how much damage is done (which is what the MMI scale measures), rather than how much the earth moved. into the air, do they also cause massive, towering clouds of sand in desert regions? 24.184.234.24 ( talk) 02:46, 2 June 2009 (UTC)LeucineZipper -Preceding unsigned comment added by 24.184.234.24 ( talk) 02:43, 2 June 2009 (UTC) Reply Īnyone knows why insurance companies use the Modified Mercalli Intensity Scale instead of the Richter Magnitude Scale in classifying earthquakes? Thanks. Your distance from the earthquake, soil condition, rupture directivity, type of buildings, etc.Ħ8.32.210.166 02:44, 9 October 2007 (UTC)trickponyĭo catastrophic earthquakes cause haboobs? After all, the greatest earthquakes cause massive mudslides and throw rocks, people, cars I assume, etc. ![]() Similarly, a higher magnitude earthquake creates higher intensities, but it is affected by various factors. A biggerĮngine usually means faster times, but this is affected by car weight, transmission, wheel traction, road Intensity is a measure of earthquake effects magnitude is a measure of the energy output.Ī car analogy: Intensity is like 0-60 time, while magnitude is engine displacement. Squid 18:13, 10 October 2007 (UTC) -Preceding unsigned comment added by Squidnchips ( talk ![]() Could you check if it corresponds with your sources? - Alex:Dan 11:15, 19 June 2007 (UTC) Reply They are grouped differently but roughly follow the same pattern. ![]() You can find this in the Romanian article: ro:Scara Mercalli (and also the table syntax). ![]() If anyone thinks this might be appropriate, tell me and I will supply them (although I cannot edit tables myself, I don't have the knowledge.)Squid 17:56, 8 June 2007 (UTC) I was just looking through a book and found some rough Richter equivalents to these.
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