Search results
Results from the WOW.Com Content Network
A 4.2 magnitude earthquake was felt across California's Sacramento County and parts of the San Francisco Bay Area on Wednesday morning, according to the U.S.
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]
A small earthquake rattled Northern California on Friday evening when a magnitude 4.2 temblor shook in Butte County. The quake struck at 6:41 p.m. about 5 miles southeast of the city of Oroville ...
“Drop, Cover, Hold on. Protect yourself,” the U.S. Geological Survey warned moment before the eathquake struck.
The 1971 San Fernando earthquake (also known as the 1971 Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The unanticipated thrust earthquake had a magnitude of 6.5 on the M s scale and 6.6 on the M w scale, and a maximum Mercalli intensity of XI ( Extreme ).
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 ...
This meant that giant earthquakes such as the 1960 Chilean earthquake (M 9.5) were only assigned an M s 8.2. Caltech seismologist Hiroo Kanamori [ 47 ] recognized this deficiency and took the simple but important step of defining a magnitude based on estimates of radiated energy, M w , where the "w" stood for work (energy):
This is a list of earthquakes in 2015. Only earthquakes of magnitude 6 or above are included, unless they result in damage and/or casualties, or are notable for some other reason. All dates are listed according to UTC (Coordinated Universal Time) time.