Updated 12:26 pm PST, Saturday, November 10, 2018 Two earthquakes hit Crockett, Calif. on Saturday afternoon. Two earthquakes hit Crockett, Calif. on Saturday afternoon. Photo: USGS Earthquake magnitudes measure the energy released by a tremor, but are not meant to calculate how intense the shaking is for those near the epicenter. To measure how forceful a quake felt to someone or something near the epicenter, geologists use something called the Modified Mercalli Intensity Scale. The following slides explain what it means when you see a roman numeral representing intensity on USGS readings and color-coded intensity maps. Information taken from a USGS magnitude vs. intensity comparison. less Earthquake magnitudes measure the energy released by a tremor, but are not meant to calculate how intense the shaking is for those near the epicenter. To measure how forceful a quake felt to someone or … more Photo: Vincent Maggiora/The Chronicle Below a 3.0 magnitude: Earthquakes at this level are generally deemed level I in intensity. These are “Not felt except by a very few under especially favorable conditions,” according to the USGS. Below a 3.0 magnitude: Earthquakes at this level are generally deemed level I in intensity. These are “Not felt except by a very few under especially favorable conditions,” according to the USGS. Photo: USGS Magnitude 3.0 to 3.9 – Earthquakes at this level are typically level II, which. according to the USGS are “only felt by a few persons at rest, especially on upper floors of buildings,” or level III, which carry “vibrations similar to the passing of… [Read full story]
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