A magnitude 4.9 earthquake shook parts of Southern California on Jan. 19, according to the U.S. Geological Survey. The quake struck about 12 miles northeast of Indio at around 5:56 p.m. PT. It caused ...
A powerful magnitude 7.1 earthquake struck off the coast of Malaysia, just after midnight local time on Monday, with shaking reported across parts of Borneo, according to seismic agencies and local ...
where A is the maximum amplitude of deflection of a needle on a chart, in millimeters, measured on the seismograph. A o is an empirical distance correction appropriate for the region (Richter, 1936).
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