The Richter scale , also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, is a measure of the strength of , developed by in collaboration with , and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". This was later revised and renamed the local magnitude scale, denoted as ML or ML . .
Naturally occurring (57La) is composed of one stable ( La) and one ( La) , with the stable isotope, La, being the most abundant (99.91% ). There are 39 that have been characterized, with the most stable being La, with a of 1.02×10 years; La, with a half-life of 60,000 years and La, with a half-life of 1.6781 days. The rem. [pdf]
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