By Lorraine Horsley
There is plenty to profit approximately child animals, are they cubs or calves, doggies or little ones? Which child belongs to which mom? This non-fiction identify talks approximately various animals and their infants with exact illustations, attention-grabbing truth labels and punctiliously levelled textual content.
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50 chapter 2 Earthquakes That Should Not Exist Deep Earthquakes During the evening of June 8, 1994, the occupants of the upper ﬂoors of high-rise buildings in Toronto experienced unpleasant, long-lasting swaying. It soon became clear that this could only have been caused by an earthquake. However, eastern Canada only experiences occasional, weak earthquakes that are rarely felt, since it is far from a plate boundary. Even experienced seismologists were surprised to ﬁnd that the waves causing the swaying were from an earthquake that occurred more than 6000 kilometers away.
The log is the base-10 logarithm. The number of earthquakes decreases logarithmically with increasing magnitude. 9. On the average, there is one magnitude-8 earthquake every year, about 100 with magnitudes greater than 6, and more than 50,000 with magnitudes greater than 3. The b-value is related to the heterogeneity of the rocks in which the earthquake occurs. If they are more fractured, the b-value is larger. Thus, the b-value is used to characterize a region seismotectonically. Scientists also try to relate changes of b over time to changes in seismic activity before or after a large earthquake.
This observation is fundamental support for the plate tectonics theory, which predicts that most deformation will occur at plate boundaries and not in their interiors. As with every model, however, plate tectonics is only an approximate description of reality. S. are far from any plate boundary. 2. Such earthquakes are considered to be the eﬀects of local stress concentration or zones of weakness due to geological heterogeneities in the Earth’s crust.