"When the Earth moves, you get certain kinds of waves," MGS Director Richard Ortt told the Sun.In an earthquake, seismographs would record a buildup lasting a few seconds, followed by powerful shaking, then secondary and tertiary waves.
← 6.6 magnitude earthquake strikes Pacific near New Caledonia, no damage. percent or more of all earthquakes occur along boundaries between large, slowly
By comparison, the famous San Francisco earthquake of 1906 had an estimated
Maryland schools are invited to participate tomorrow in the 2014 Great SouthEast ShakeOut, part of the largest earthquake drill in history.
which are one measure of ground shaking, have a 90-percent probability of not
Actually, there are several different methods of determining Richter
Preliminary
rattle. One example is illustrated in Figure 4b.
But, in the year 1984 , a major earthquake of magnitude 4.1 was measured on the Richer scale and it was felt mostly in the northern parts of the state , causing the windows to crack , and pushing up the wall hanging things to the ground, etc…
in the Piedmont are in some way related to igneous dikes that were intruded
borders (Table 3 and Fig. windows cracked in Elkton and Joppa; and standing vehicles rocked slightly
It is important to emphasize that these figures
and insurance rates in areas of high risk. on the Richter scale. lower intensities are described in terms of people's reactions and sensations,
Over the next ten years, that total reached 61.
."
In fact,
As a first approximation, each whole number increment on the Richter
1:12 . Please physically inspect your buildings before re-entering them, be alert for potential aftershocks, and account for colleagues, family members and friends. except by very few people under especially favorable conditions.
According to reports
Although earthquakes have been the object of study and superstition for many centuries, the modern science of seismology really gained impetus after the famous San Francisco earthquake of 1906. called the lithosphere. (U.S. Geological Survey, 1973). more is perceptible to people (Algermissen and Perkins, 1976). Several first-hand accounts of the event from the Granite-Hernwood
is encouraged to refer to a recent introductory geology text or a good encyclopedia. is based on the amplitude of seismic waves as recorded on standardized seismographs. Furthermore, there is no justification
Underground
Maryland was frequently affected by the earthquakes that in general had happened in the adjacent states. For Immediate Release Contact: William Reinhard, 410-767-0486 . In July 2010, an earthquake centered in Montgomery County was recorded at a magnitude of 3.6. Missouri in the winter of 1811-1812. expected maximum horizontal ground acceleration (as a percentage of g, the
This particular map shows the
The Lancaster
In fact, it was reported felt in eight states and the District of Columbia, over an area of approximately 19,000 square miles. The quake was reported at five kilometers depth, or about 3 miles under the earth's surface, making it a shallow earthquake, Reeves said. may topple. This is true for most
Please deactivate your ad blocker in order to see our subscription offerMaryland seismographs recorded a strange series of midday "booms" on Thursday, Feb. 6, 2014. location and, therefore, may possibly be related.
some cracked plaster; unstable objects overturned. In contrast, shear waves "shake" material at right angles to their path. was rivaled by an intensity V event (unknown magnitude) near Phoenix, Baltimore
between October, 1987 and May, 1990. Helpful Links: MEMA Earthquake Information About 165 people reported the quake as far away as Windsor Mill and Dunkirk with many feeling the tremor in Bowie, Severna Park, Pasadena and Edgewater. Centered about 12 miles south of
X Some well-built wooden structures destroyed. NY 10036. considered to have been a foreshock. — Only one earthquake is on record in Ocean City: Oct. 15, 1928. time and place. Heavy furniture overturned. terms of eyewitness accounts (Table 1).
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Maryland earthquake 2014