'earthquake bay area'

san jose earthquake
A moderate earthquake shook the San Francisco Bay area Tuesday night, rattling homes and nerves, but there were no immediate reports of damage or injuries.

The quake had a preliminary magnitude of 5.6 and struck shortly after 8 p.m., about 9 miles northeast of San Jose, according to the U.S. Geological Survey. Residents reported feeling the quake, which lasted about a minute, as far east as Sacramento and as far north as Sonoma in California wine country.
 bay area earthquake. Recent earthquakes with fault and topographic information
earthquake magnitude
How Are Earthquake Magnitudes Measured?
The Richter magnitudes are based on a logarithmic scale (base 10). What this means is that for each whole number you go up on the Richter scale, the amplitude of the ground motion recorded by a seismograph goes up ten times. Using this scale, a magnitude 5 earthquake would result in ten times the level of ground shaking as a magnitude 4 earthquake (and 32 times as much energy would be released). To give you an idea how these numbers can add up, think of it in terms of the energy released by explosives: a magnitude 1 seismic wave releases as much energy as blowing up 6 ounces of TNT. A magnitude 8 earthquake releases as much energy as detonating 6 million tons of TNT. Pretty impressive, huh? Fortunately, most of the earthquakes that occur each year are magnitude 2.5 or less, too small to be felt by most people.

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