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Anonymous
Anonymous asked in Science & MathematicsEarth Sciences & Geology · 10 years ago

Earthquake question.?

Alright so did you all hear about the earthquake in Virginia? Well I live in a state near there but I didn't feel it. So yesterday I went online and looked at a live earthquake map. There was tons of earthquakes yesterday in Nevada, Colorado, Virginia, California, and Alaska. So I looked at it again today and there was more earthquakes in california and colorado. I kow they are common in California but I am asking if this is normal?

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  • Anonymous
    10 years ago
    Favorite Answer

    The earthquakes in Virginia and southern Colorado are not common, but are not unknown, either. The last such quake (of 5 magnitude) in Virginia occurred during World War II, but small quakes in Virginia happen 2-3 per year. In Colorado we had quakes in the Denver area in 1964-1970 due to an injection well at the Rocky Mountain Arsenal. There was a major quake (estimated to have been a 6) near Aspen in the 1880s.

    All the continents have been stitched together from pieces and torn apart repeatedly in the last 3 billion years. There are deep faults everywhere and there is no place in the world that is completely safe from earthquakes. This is not to say that everywhere is as shaky as California, though. Yesterday was a token to that truth.

  • 10 years ago

    The Virginia earthquake of 2011 August 23 occurred as reverse faulting on a north or northeast-striking plane within a previously recognized seismic zone, the "Central Virginia Seismic Zone." The Central Virginia Seismic Zone has produced small and moderate earthquakes since at least the 18th century. The previous largest historical shock from the Central Virginia Seismic Zone occurred in 1875. The 1875 shock occurred before the invention of effective seismographs, but the felt area of the shock suggests that it had a magnitude of about 4.8. The 1875 earthquake shook bricks from chimneys, broke plaster and windows, and overturned furniture at several locations. A magnitude 4.5 earthquake on 2003, December 9, also produced minor damage.

    Previous seismicity in the Central Virginia Seismic Zone has not been causally associated with mapped geologic faults. Previous, smaller, instrumentally recorded earthquakes from the Central Virginia Seismic Zone have had shallow focal depths (average depth about 8 km). They have had diverse focal mechanisms and have occurred over an area with length and width of about 120 km, rather than being aligned in a pattern that might suggest that they occurred on a single causative fault. Individual earthquakes within the Central Virginia Seismic Zone occur as the result of slip on faults that are much smaller than the overall dimensions of the zone. The dimensions of the individual fault that produced the 2011 August 23 earthquake will not be known until longer-term studies are done, but other earthquakes of similar magnitude typically involve slippage along fault segments that are 5 - 15 km long.

    Earthquakes in the central and eastern U.S., although less frequent than in the western U.S., are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).

  • Alex
    Lv 7
    10 years ago

    Yes, it's normal. There are small fault lines all over. Keep in mind that an earthquake with a magnitude less than 3.0 is barely noticeable.

  • 10 years ago

    There are ALWAYS earthquakes in the west coast. Sometimes the earthquakes are so small, people don't even feel them. Teachers need to start teaching east coast kids about earth quakes. Even the adults,

    Source(s): 14, lived in cali for 10 years, was taught about earthqukes.
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  • 10 years ago

    I heard on the news by the geo guy that it was a once and a century earthquake so ya it's sorta abnormal but nothing of concern.

    Source(s): News
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