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| ▲ | zamadatix 11 hours ago | parent | next [-] | | It's just a "6+" on the Japan Meteorological Agency seismic intensity scale, which does otherwise fit the description about being 1 less than the maximum on that scale, but the "M 6.9" actually refers to the value in the more universal moment magnitude scale (and just happens to also start with 6 in this case). When intensity is mentioned it's the 0-7 scale, when M or magnitude is mentioned it's about the moment magnitude scale. https://earthquake.usgs.gov/earthquakes/eventpage/us6000t7zq... | |
| ▲ | qmarchi 11 hours ago | parent | prev [-] | | You're conflating two things, magnitude and intensity. This earthquake was measured as a 6.9 moment magnitude, sometimes referred to incorrectly as the "Richter" scale. The Shindo intensity system is measured without decimal places. In this particular case, the intensity was a 6+. Which isn't the highest, but is still quite severe. | | |
| ▲ | mc3301 11 hours ago | parent [-] | | And the Shindo system is best described as "what it feels like at the specific location" So an earthquake can be a 4 at the epicenter, a 3 a little further away, a 2 even further away, and so on. Common online conversation with a friend in a different prefecture may be something like, "Last night's earthquake was a 3 here, how about you?" |
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