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The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]
“Whoa 3.5 earthquake shook me out of bed at 6 AM Epicenter a mile from my house around Valemar area Pacifica California,” Jim tweeted. “Yep, I felt it! It woke me up earlier than expected.
An average of five earthquakes with magnitudes between 3.0 and 4.0 occur per year in the greater Los Angeles area, according to a recent three-year data sample. The earthquake occurred at a depth ...
Much of an earthquake's total energy as measured by M w is dissipated as friction (resulting in heating of the crust). [52] An earthquake's potential to cause strong ground shaking depends on the comparatively small fraction of energy radiated as seismic waves, and is better measured on the energy magnitude scale, M e. [53]
The formula to calculate surface wave magnitude is: [3] = + (), where A is the maximum particle displacement in surface waves (vector sum of the two horizontal displacements) in μm, T is the corresponding period in s (usually 20 ± 2 seconds), Δ is the epicentral distance in °, and
The U.S. Geological Survey has determined that a magnitude 3.5 earthquake that jostled the Kansas City metro area last month was caused by a mine collapse.. The quake, which had an epicenter near ...
A magnitude 3.5 earthquake was reported at 3:09 p.m. Sunday off the Palos Verdes Peninsula, according to the U.S. Geological Survey.
The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or strength of an earthquake – an event occurring at greater or lesser depth. (The "M w" scale is ...